Service Manual HL760-7A
Service Manual HL760-7A
Service Manual HL760-7A
73031GE01
7707GE01
1-1
PREPARE FOR EMERGENCIES
Be prepared if a fire starts.
Keep a first aid kit and fire extinguisher handy.
Keep emergency numbers for doctors,
ambulance service, hospital, and fire
department near your telephone.
73031GE03
73031GE04
73031GE05
1-2
PARK MACHINE SAFELY
Before working on the machine:
· Park machine on a level surface.
· Lower bucket to the ground.
· Turn key switch to OFF to stop engine.
Remove key from switch.
· Move pilot control shutoff lever to locked
position.
· Allow engine to cool. 73031GE23
73031GE07
73031GE08
1-3
Store flammable fluids away from fire hazards.
Do not incinerate or puncture pressurized
containers.
Make sure machine is clean of trash, grease,
and debris.
Do not store oily rags ; They can ignite and
burn spontaneously.
73031GE09
1-4
ILLUMINATE WORK AREA SAFELY
Illuminate your work area adequately but safely.
Use a portable safety light for working inside or
under the machine. Make sure the bulb is
enclosed by a wire cage. The hot filament of an
accidentally broken bulb can ignite spilled fuel or
oil.
73031GE11
73031GE13
1-5
AVOID HIGH PRESSURE FLUIDS
Escaping fluid under pressure can penetrate the
skin causing serious injury.
Avoid the hazard by relieving pressure before
disconnecting hydraulic or other lines. Tighten
all connections before applying pressure.
Search for leaks with a piece of cardboard.
Protect hands and body from high pressure
73031GE14
fluids.
If an accident occurs, see a doctor immediately.
Any fluid injected into the skin must be surgically
removed within a few hours or gangrene may
result.
73031GE15
other materials.
1-6
PREVENT ACID BURNS
Sulfuric acid in battery electrolyte is poisonous. It
is strong enough to burn skin, eat holes in clothing,
and cause blindness if splashed into eyes.
Avoid the hazard by:
1. Filling batteries in a well-ventilated area.
2. Wearing eye protection and rubber gloves.
3. Avoiding breathing fumes when electrolyte is
added.
4. Avoiding spilling of dripping electrolyte.
5. Use proper jump start procedure.
If you spill acid on yourself:
1. Flush your skin with water.
2. Apply baking soda or lime to help neutralize
the acid.
3. Flush your eyes with water for 10-15 minutes.
Get medical attention immediately.
If acid is swallowed:
1. Drink large amounts of water or milk.
2. Then drink milk of magnesia, beaten eggs,
or vegetable oil.
3. Get medical attention immediately.
73031GE18
1-7
SERVICE TIRES SAFELY
Explosive separation of a tire and rim parts can
cause serious injury or death.
Do not attempt to mount a tire unless you have the
proper equipment and experience to perform the job.
Always maintain the correct tire pressure. Do not
inflate the tires above the recommended pressure.
Never weld or heat a wheel and tire assembly.
The heat can cause an increase in air pressure
resulting in a tire explosion.
Welding can structurally weaken or deform the wheel.
When inflating tires, use a clip-on chuck and
extension hose long enough to allow you to stand
to one side and not in front of or over the tire
assembly. Use a safety cage if available.
Check wheels for low pressure, cuts, bubbles,
damaged rims or missing lug bolts and nuts. 73031GE24
73031GE25
1-8
REPLACE SAFETY SIGNS
Replace missing or damaged safety signs. See
the machine operator's manual for correct safety
sign placement.
73031GE21
1-9
GROUP 2 SPECIFICATION
1. MAJOR COMPONENT
Bucket Boom Tire Head light Hydraulic tank Air cleaner Battery
Bucket link Bell crank Steering cylinder Cab Precleaner Muffler Engine
7607A2SE01
1-10
2. SPECIFICATIONS
1) WITH BOLT-ON CUTTING EDGE TYPE BUCKET(HL760-7A)
B
F
I
J
5540
4150
H
3210
C
K
40
G
57
668
D
25
0
E 1815
A
7607A2SE02
1-11
WITH BOLT-ON CUTTING EDGE TYPE BUCKET(HL760XTD-7A)
B
F
I
J
6030
4610
H
3210
C
K
40
G
57
690
D
0 25
E 1815
A
7607A2SE03
1-12
2) WITH TOOTH TYPE BUCKET(HL760-7A)
B
F
I
J
5540
4150
H
3210
C
K
40
G
57
675
D
25
5
E 1815
A
7607A2SE04
1-13
WITH TOOTH TYPE BUCKET(HL760XTD-7A)
B
F
I
J
6030
4610
H
3210
C
K
40
G
57
698
D
0 25
E 1815
A
7607A2SE05
1-14
3. WEIGHT
Item kg lb
1-15
4. SPECIFICATION FOR MAJOR COMPONENTS
1) ENGINE
Item Specification
1-16
2) MAIN PUMP
Specification
Item
Steering Loader
Type Fixed displacement tandem gear pump
Capacity 68cc/rev 68cc/rev
Maximum operating pressure 210kgf/cm2(2990psi)
Rated oil quantity 140ℓ/min(37.0U.S.gpm) 140ℓ/min(37.0U.S.gpm)
Rated speed 2100rpm
Item Specification
Type 2 spool
Operating method Hydraulic pilot assist
Main relief valve pressure 210kgf/cm2(2990psi)
Overload relief valve pressure(Boom) 240kgf/cm2(3410psi)
Item Specification
1-17
6) CYLINDER
Item Specification
Item Specification
Model ZF 4WG210
Converter Single-stage, single-phase
Type
Transmission Full-automatic power shift
Transmission
Gear shift Forward fourth gear, reverse third gear
Adjustment Electrical single lever type, kick-down system
Drive devices 4-wheel drive
Axle Front Front fixed location
Rear Oscillation Ü12Áof center pin-loaded
Wheels Tires 23.5-25, 20PR(L3)
Travel Four-wheel, wet-disc type, full hydraulic
Brakes
Parking Spring applied, hydraulic released brake
Type Full hydraulic, articulated
Steering
Steering angle 40Áto both right and left angle, respectively
1-18
5. TIGHTENING TORQUE OF MAJOR COMPONENT
No. Items Size kgfÂm lbfÂft
1 Engine mounting bolt, nut(Rubber, 2EA) M20Ý2.5 57.9 Ü 8.7 419Ü 62.9
2 Engine mounling bolt(Bracket, 8EA) M12Ý1.75 10.7 Ü 1.6 77.4Ü 11.6
3 Engine Engine mounting bolt(Fly wheel housing,12EA) M10Ý1.5 4.6 Ü 0.9 33.3Ü 6.5
4 Radiator mounting bolt M16Ý2.0 29.7Ü 4.5 215Ü 32.5
5 Fuel tank mounting bolt, nut M16Ý2.0 29.7 Ü 4.5 215Ü 32.5
6 Main pump housing mounting bolt M12Ý1.75 12.8 Ü 3.0 92.6Ü 21.7
7 Brake pump housing mounting bolt M10Ý1.5 6.9 Ü 1.4 49.9Ü 10.1
8 Main control valve mounting bolt M12Ý1.75 12.8 Ü 3.0 92.6Ü 21.7
9 Steering unit mounting bolt M10Ý1.5 6.9 Ü 1.4 49.9Ü 10.1
10 Steering valve(EHPS) mounting bolt M8Ý1.25 2.5 Ü 0.5 18.1Ü 3.6
Hydraulic
11 Brake valve mounting bolt M8Ý1.25 2.5 Ü 0.5 18.1Ü 3.6
system
12 Cut-off valve mounting bolt M12Ý1.75 12.8 Ü 3.0 92.6Ü 21.7
13 Remote control lever mounting bolt M6Ý1.0 1.1Ü 0.2 8.0Ü 1.4
14 Pilot supply unit mounting bolt M8Ý1.25 2.5 Ü 0.5 18.1Ü 3.6
15 Safety valve M8Ý1.25 2.5 Ü 0.5 8.1Ü 3.6
16 Hydraulic oil tank mounting bolt M16Ý2.0 29.7 Ü 4.5 215 Ü 32.5
17 Transmission mounting bolt, nut(Rubber, 2EA) M24Ý3.0 100 Ü 15 723 Ü 108
18 Transmission mounting bolt(Bracket) M20Ý2.5 46.3 Ü 7.0 335Ü 50.6
-#0293(VOLVO) M24Ý2.0 100 Ü 15 723Ü 108
19 Power train Front axle mounting bolt, nut
#0294-(ZF) M27Ý2.0 135 Ü 15 976Ü 108
system
20 Rear axle support mounting bolt, nut M36Ý3.0 308 Ü 46.2 2228Ü 334
21 Tire mounting nut M22Ý1.5 61 Ü 2.0 441Ü 14.5
22 Drive shaft joint mounting bolt, nut 1/2-20UNF 15 Ü 2.0 108Ü 14.5
23 Counterweight mounting bolt M30Ý3.5 199 Ü 29.9 1439Ü 216
24 Others Operator's seat mounting bolt M8Ý1.25 3.4 Ü 0.8 24.6Ü 5
25 ROPS Cab mounting bolt(4EA) M27Ý2.0 125 Ü 15 904 Ü 108
1-19
6. TORQUE CHART
Use following table for unspecified torque.
1) BOLT AND NUT
(1) Coarse thread
8T 10T
Bolt size
kgf·m lbf·ft kgf·m lbf·ft
M 6 × 1.0 0.85 ~ 1.25 6.15 ~ 9.04 1.14 ~ 1.74 8.2 ~ 12.6
M 8 × 1.25 2.0 ~ 3.0 14.5 ~ 21.7 2.73 ~ 4.12 19.7 ~ 29.8
M10 × 1.5 4.0 ~ 6.0 28.9 ~ 43.4 5.5 ~ 8.3 39.8 ~ 60
M12 × 1.75 7.4 ~ 11.2 53.5 ~ 79.5 9.8 ~ 15.8 71 ~ 114
M14 × 2.0 12.2 ~ 16.6 88.2 ~ 120 16.7 ~ 22.5 121 ~ 167
M16 × 2.0 18.6 ~ 25.2 135 ~ 182 25.2 ~ 34.2 182 ~ 247
M18 × 2.5 25.8 ~ 35.0 187 ~ 253 35.1 ~ 47.5 254 ~ 343
M20 × 2.5 36.2 ~ 49.0 262 ~ 354 49.2 ~ 66.6 356 ~ 482
M22 × 2.5 48.3 ~ 63.3 350 ~ 457 65.8 ~ 98.0 476 ~ 709
M24 × 3.0 62.5 ~ 84.5 452 ~ 611 85.0 ~ 115 615 ~ 832
M30 × 3.5 124 ~ 168 898 ~ 1214 169 ~ 229 1223 ~ 1655
M36 × 4.0 174 ~ 236 1261 ~ 1703 250 ~ 310 1808 ~ 2242
8T 10T
Bolt size
kgf·m lbf·ft kgf·m lbf·ft
M 8 × 1.0 2.17 ~ 3.37 15.7 ~ 24.3 3.04 ~ 4.44 22.0 ~ 32.0
M10 × 1.25 4.46 ~ 6.66 32.3 ~ 48.2 5.93 ~ 8.93 42.9 ~ 64.6
M12 × 1.25 7.78 ~ 11.58 76.3 ~ 83.7 10.6 ~ 16.0 76.6 ~ 115
M14 × 1.5 13.3 ~ 18.1 96.2 ~ 130 17.9 ~ 24.1 130 ~ 174
M16 × 1.5 19.9 ~ 26.9 144 ~ 194 26.6 ~ 36.0 193 ~ 260
M18 × 1.5 28.6 ~ 43.6 207 ~ 315 38.4 ~ 52.0 278 ~ 376
M20 × 1.5 40.0 ~ 54.0 289 ~ 390 53.4 ~ 72.2 386 ~ 522
M22 × 1.5 52.7 ~ 71.3 381 ~ 515 70.7 ~ 95.7 512 ~ 692
M24 × 2.0 67.9 ~ 91.9 491 ~ 664 90.9 ~ 123 658 ~ 890
M30 × 2.0 137 ~ 185 990 ~ 1338 182 ~ 248 1314 ~ 1795
M36 × 3.0 192 ~ 260 1389 ~ 1879 262 ~ 354 1893 ~ 2561
1-20
2) PIPE AND HOSE(FLARE TYPE)
1/4" 19 4 28.9
3/8" 22 5 36.2
1/2" 27 9.5 68.7
3/4" 36 18 130
1" 41 21 152
1-1/4" 50 35 253
9/16-18 19 4 28.9
11/16-16 22 5 36.2
13/16-16 27 9.5 68.7
1-3/16-12 36 18 130
1-7/16-12 41 21 152
1-11/16-12 50 35 253
4) FITTING
1/4" 19 4 28.9
3/8" 22 5 36.2
1/2" 27 9.5 68.7
3/4" 36 18 130
1" 41 21 152
1-1/4" 50 35 253
1-21
7. RECOMMENDED LUBRICANTS
Use only oils listed below or equivalent.
Do not mix different brand oil.
Ambient temperature Á
C( Á
F)
Capacity
Service point Kind of fluid ˶(U.S. gal) -20 -10 0 10 20 30 40
(-4) (14) (32) (50) (68) (86) (104)
SAE 30
SAE 10W
Engine oil pan Engine oil 18(4.8)
SAE 10W-30
SAE 15W-40
SAE 10W-30
Transmission Oil 32(8.5)
SAE 15W-40
Tank: ISO VG 32
150(39.7)
Hydraulic tank Hydraulic oil ISO VG 46
System:
260(69) ISO VG 68
NLGI NO. 1
Fitting
Grease As required
(Grease nipple)
NLGI NO. 2
Mixture of
antifreeze Ethylene glycol base permanent type
Radiator 39(10.3)
and water
50 : 50
 SAE Society of Automotive Engineers ø
Recommended oil list
 API American Petroleum Institute Ç BP TERRAC SUPER TRANSMISSION 10W-30
 ISO International Organization for Standardization Ç CASTROL AGRI TRANS PLUS 10W-30
 NLGI National Lubricating Grease Institute Ç MOBILFLUID 426
 ASTM American Society of Testing and Material Ç SHELL DONAX TD 10W-30
 UTTO Universal Tractor Transmission Oil Ç TOTAL DYNATRANS MPV
1-22
GROUP 3 OPERATIONAL CHECKOUT RECORD SHEET
·Owner :
·Date :
·Hours :
·Serial No. :
·Technician :
OK NOT
Item OK Comments
1-23
4. Brake system and clutch cut off checks
5. Driving checks
1-24
7. Steering system checks
8. Accessory checks
1-25
GROUP 2 ENGINE SPEED & STALL RPM
1. TEST CONDITION
1) Normal temperature of the whole system
- Coolant : Approx 80 äC (176 ä
F)
- Hydraulic oil : 45 Ü 5 ä
C (113 Ü 10 ä F)
- Transmission oil : 75 Ü 5 ä
C (167 Ü 10 ä F)
2) Normal operating pressure : See page 6-53.
2. SPECIFICATION
Engine speed, rpm
Remark
Low idle High idle Pump stall Converter stall Full stall
800Ü25 2230Ü50 2100Ü70 2110Ü70 1670Ü100
91N6-22
MODEL
SERIAL-NUMBER
ULSAN, KOREA
OPERATING WEIGHT
ENGINE POWER(PS/KW/rpm)
91N6-01131
91N6-02120
91N6-03140
91LB-01320
91N6-22
MODEL
SERIAL-NUMBER
ULSAN, KOREA
OPERATING WEIGHT
ENGINE POWER(PS/KW/rpm)
91N6-01131
91N6-02120
91N6-03140
forward position.
- Check the engine rpm at the above 7577AWE62
condition.
3) Full stall rpm
- Start the engine and raise the bucket Released position
91N6-22
91N6-01131
pedal fully .
91N6-02120
ULSAN, KOREA
SERIAL-NUMBER
91LB-01190
91N6-03140
1. REQUIRED TOOL
Item Spec
Pressure gauge 250~300kgf/cm2(3550~4270psi)
rpm gauge 200~2000rpm
Wrench 13mm
Tool
Hex. wrench 3mm
3) Pressure check
(1) Install the pressure gauge to fan drive motor. ( )
(2) Disconnect CN-154.
(3) Check the fan drive motor pressure at high engine rpm.
(4) Check the cooling fan speed using rpm gauge at high engine rpm.
4) Adjustment
(1) Turn the adjusting screw clockwise to
increase the cooling fan rpm and relief
pressure.
(2) Turn the adjusting screw counter
clockwise to decrease the cooling fan rpm
and relief pressure.
Adjusting screw
WTHCS02
2-8
SECTION 3 POWER TRAIN SYSTEM
Transmission Engine
Front axle
Front drive shaft Center drive shaft Rear drive shaft Rear axle
7607APT01
3-1
HYDRAULIC CIRCUIT
K4 KR K1 K3 KV K2
P1 F 60 P2 E 55 P3 D 56 P4 C 58 P5 B 53 P6 A 57
B D B D B D B D B D B D
Pressure
Temp reducing
sensor valve
9+0.5 bar
System
pressure
Valve block control circuit valve
16+2 bar
Filter pressure
differential valve
Converter
Relief Filter
valve
11+2 bar
Oil sump
Lubrication Main oil circuit
7607APT18
Current
Forward Reverse Positions
Engaged No. of the
Speed Neutral on the
clutch measuring
1 2 3 4 1 2 3 valve block
points
Y1 X K4 F 60
Y2 X X X KR E 55
Y3 X X K1 D 56
Y4 X X X K3 C 58
Y5 X X X KV B 53
Y6 X X K2 A 57
Engaged
K1,KV KV,K2 K3,KV K4,K3 KR,K1 KR,K2 KR, K3 - - -
clutch
X : Pressure regulator under voltage
3-2
2. TORQUE CONVERTER
5 1 2 3 4
73033TM00
The converter is working according to the Trilok-system, i.e. it assumes at high turbine speed the
characteristics, and with it the favorable efficiency of a fluid clutch.
The converter will be defined according to the engine power so that the most favorable operating
conditions for each installation case are given.
The Torque converter is composed of 3 main components :
Pump wheel - turbine wheel - stator(Reaction member)
These 3 impeller wheels are arranged in such a ring-shape system that the fluid is streaming through
the circuit components in the indicated order.
Pressure oil is constantly streaming out of the transmission pump through the converter. In this way, the
converter can fulfill its task to multiply the torque of the engine, and at the same time, the heat created in
the converter is dissipated through the escaping oil.
The oil, escaping out of the pump wheel, enters the turbine wheel and is there inversed in the direction
of flow.
According to the rate of inversion, the turbine wheel and with it also the output shaft, receive a more or
less high reaction moment. The stator(Reaction member), following the turbine, has the task to inverse
again the oil which is escaping out of the turbine and to delivery it under the suitable discharge direction
to the pump wheel.
Due to the inversion, the stator receives a reaction moment.
The relation turbine moment/pump moment is called torque conversion. This is the higher the greater
the speed difference of pump wheel and turbine wheel will be.
Therefore, the maximum conversion is created at standing turbine wheel.
With increasing output speed, the torque conversion is decreasing. The adaption of the output speed to
a certain required output moment is infinitely variable and automatically achieved by the torque
converter.
3-3
If the turbine speed is reaching about 80% of the pump speed, the conversion becomes 1.0 i.e. the
turbine moment becomes equal to that of the pump moment.
From this point on, the converter is working similar to a fluid clutch.
A stator freewheel serves to improve the efficiency in the upper driving range, it is backing up in the
conversion range the moment upon the housing, and is released in the coupling range.
In this way, the stator can rotate freely.
Turbine wheel
From the engine
TT
TP
To the gearbox
Starting nT = 0
condition 1 Reaction member
1.5
(Stator) 2.5 Machine stopped
Intermediate
condition 1 <1.5
nT < n engine
<2.5
Condition shortly
before the converter 1 1 nT = 0.8n engine
clutch is closed. 0
(760) 3-4
3-4
3. TRANSMISSION
1) LAYOUT
12
1
11
2
10
4
9
15
14
13
7607PT03
3-5
2) INSTALLATION VIEW
2 11 6 12 16
10
18
1
19
3 17
7 20
5
3 15
14 13
9 3
8 4
7607PT02
3-6
3) OPERATION OF TRANSMISSION
(1) Forward
① Forward 1st
In 1st forward, forward clutch(KV) and 1st clutch(K1) are engaged.
Forward clutch and 1st clutch are actuated by the hydraulic pressure applied to the clutch piston.
KR KR
KV IN
K4
K2
INPUT
K3 K1
KV
OUT
GEAR PATTERN
K2
K1 K3
K4
OUTPUT OUTPUT
7607PT04
3-7
② Forward 2nd
In 2nd forward, forward clutch(KV) and 2nd clutch(K2) are engaged.
Forward clutch and 2nd clutch are actuated by the hydraulic pressure applied to the clutch piston.
KR KR
KV IN
K4
K2
INPUT
K3 K1
KV
OUT
GEAR PATTERN
K2
K1 K3
K4
OUTPUT OUTPUT
7607PT05
3-8
③ Forward 3rd
In 3rd forward, forward clutch(KV) and 3rd clutch(K3) are engaged.
Forward clutch and 3rd clutch are actuated by the hydraulic pressure applied to the clutch piston.
KR KR
KV IN
K4
K2
INPUT
K3 K1
KV
OUT
GEAR PATTERN
K2
K1 K3
K4
OUTPUT OUTPUT
7607PT06
3-9
④ Forward 4th
In 4th forward, 4th clutch(K4) and 3rd clutch(K3) are engaged.
4th clutch and 3rd clutch are actuated by the hydraulic pressure applied to the clutch piston.
KR KR
KV IN
K4
K2
INPUT
K3 K1
KV
OUT
GEAR PATTERN
K2
K1 K3
K4
OUTPUT OUTPUT
7607PT07
3-10
(2) Reverse
① Reverse 1st
In 1st reverse, reverse clutch(KR) and 1st clutch(K1) are engaged.
Reverse clutch and 1st clutch are actuated by the hydraulic pressure applied to the clutch piston.
KR KR
KV IN
K4
K2
INPUT
K3 K1
KV
OUT
GEAR PATTERN
K2
K1 K3
K4
OUTPUT OUTPUT
7607PT08
3-11
② Reverse 2nd
In 2nd reverse, reverse clutch(KR) and 2nd clutch(K2) are engaged.
Reverse clutch and 2nd clutch are actuated by the hydraulic pressure applied to the clutch piston.
KR KR
KV IN
K4
K2
INPUT
K3 K1
KV
OUT
GEAR PATTERN
K2
K1 K3
K4
OUTPUT OUTPUT
7607PT09
3-12
③ Reverse 3rd
In 3rd reverse, reverse clutch(KR) and 3rd clutch(K3) are engaged.
Reverse clutch and 3rd clutch are actuated by the hydraulic pressure applied to the clutch piston.
KR KR
KV IN
K4
K2
INPUT
K3 K1
KV
OUT
GEAR PATTERN
K2
K1 K3
K4
OUTPUT OUTPUT
7607PT10
3-13
4) ELECTRO-HYDRAULIC SHIFT CONTROL WITH PROPORTIONAL VALVE
2 1 3
A A
Y6 Y1
Y5 Y2
B
Y4 Y3
3 6
2 6 1 4 11 9 10
Y5
Transmission control see schedule of measuring points, hydraulic schematic and electro-hydraulic
control unit at page 3-2, 3-14 and 3-83.
The six clutches of the transmission are selected through the 6 proportional valves P1 to P6. The
proportional valve(Pressure regulator-unit) consists of pressure regulator(e.g. Y1), booster valve
oscillation damper.
The pilot pressure of 9 bar for the control of the follow-on slides is created by the reducing valve.
The pressure oil (16+2bar) is directed through the follow-on slide to the corresponding clutch.
3-14
By the direct proportional selection with separate pressure modulation for each clutch, the
pressures to the clutches, taking part in the gear change, are controlled. In this way, a hydraulic
overlab of the clutches to be engaged and disengaged is achieved.
This is leading to fast shiftings without traction force interruption.
At the shifting, the following criteria are considered:
- Speed of engine, turbine, central gear train and output.
- Transmission temperature.
- Shifting mode(Up-, down-, reverse shifting and gear engaging from neutral).
- Load level(Full- and partial load, traction, coasting inclusive consideration of load cycles during the
shifting).
The system pressure valve is limiting the maximum control pressure to 16+2 bar and releases the
main stream to the converter and lubricating circuit.
A converter relief valve is installed in the converter inlet, which protects the converter against high
internal pressures(Opening pressure 9bar).
Within the converter, the oil transfers the power transmission according to the well-known
hydrodynamic principle(See torque converter, page 3-3).
In order to avoid cavitation, the converter must be always completely filled with oil.
This is achieved by a converter back pressure valve, following the converter, with an opening
pressure of about 3.5bar.
The oil, escaping from the converter, is directed to a oil cooler.
The oil is directed from the oil cooler to the transmission and from there to the lubricating-oil circuit
so that all lubricating points are supplied with cooled oil.
In the electro-hydraulic control unit there are 6 pressure regulators installed.
5) GEAR SELECTOR(DW-3)
The gear selector is designed for the
mounting on the left side of the steering
column. The positions(Speeds) 1 to 4 are F
3-15
6) LCD
1 LCD
2( ) Right, Buzzer stop
Move to the next selection
1
3( ) Select(Enter)
Activate the currently chosen item
2 4( ) Escape
3 Return to the previous menu
4 5( ) Main, Menu
5 - Display menu
7707A3CD04
- Return to the main display
2
TYPE 1 TYPE 2
1
4
c
a
3 e 5
b
d
7
6
8 9
7707A3CD10
3-16
(2) Display map
7707A3CD11
1
·Alarm setting. It is possible to set 3 alarms.
Alarm 2
·Stop alarming :
3
User Alternate ON ·Raise the idle rpm to 1200rpm automatically
-
idle OFF to warm up the engine.
3-17
Main group Sub group Meaning Display on LCD
Adjustment MKS Total 50.7 Km
Unit ·Choose between metric and inch unit display.
ENG Total 31.5 Mile
Wiper ·When using the intermittent function of wiper
Intermittence motor, it regulates operation time.
·Regulate idle rpm.
Alternate RPM ·Press : Adjust idle rpm increments -
(or decrement) by 25rpm.
3-18
(3) Machine fault code
When selecting the fault code menu, it shows all of the fault codes which mean abnormal
conditions of present time.
3 's FAULT 71
34 71 72 TCU Communication Error
7707A3CD36
3-19
(4) Transmission warning
3-20
(5) Display during AEB mode
3-21
(6) Engine fault codes
Fault code No. Reason Effect (only when fault code is active)
Engine control module critical internal failure - Possible no noticeable performance effects,
Bad intelligent device or component. Error engine dying, or hard starting.
111
internal to the ECM related to memory hardware
failures or internal ECM voltage supply circuits.
Engine magnetic crankshaft speed/position lost Fueling to injectors is disabled and the engine
both of two signals - Data erratic, intermittent, or can not be started.
115 incorrect. The ECM has detected that the
primary engine speed sensor and the backup
engine speed sensor signals are reversed.
Intake manifold 1 pressure sensor circuit - Engine power derate.
Voltage above normal, or shorted to high
122
source. High signal voltage detected at the
intake manifold pressure circuit.
Intake manifold 1 pressure sensor circuit - Engine power derate.
Voltage below normal, or shorted to low Source.
123
Low signal voltage or open circuit detected at the
intake manifold pressure circuit.
Intake manifold 1 pressure - Data valid but Engine power derate.
above normal operational range - Moderately
124 severe level. Intake manifold pressure has
exceeded the maximum limit for the given
engine rating.
Accelerator pedal or lever position sensor 1 Severe derate in power output of the engine.
circuit - Voltage above normal, or shorted to high Limp home power only.
131
source. High voltage detected at accelerator
pedal position circuit.
Accelerator pedal or lever position sensor 1 Severe derate in power output of the engine.
circuit - Voltage below normal, or shorted to low Limp home power only.
132
source. Low voltage detected at accelerator
pedal position signal circuit.
Remote accelerator pedal or lever position Remote accelerator will not operate. Remote
sensor 1 circuit - Voltage above normal, or accelerator position will be set to zero percent.
133
shorted to high source. High voltage detected at
remote accelerator pedal position circuit.
Remote accelerator pedal or lever position Remote accelerator will not operate. Remote
sensor 1 circuit - Voltage below normal, or accelerator position will be set to zero percent.
134
shorted to low source. Low voltage detected at
remote accelerator pedal position signal circuit.
Engine oil rifle pressure 1 sensor circuit - Voltage None on performance. No engine protection
above normal, or shorted to high source. High for oil pressure.
135
signal voltage detected at the engine oil
pressure circuit.
Engine oil rifle pressure 1 sensor circuit - Voltage None on performance. No engine protection
below normal, or shorted to low source. Low for oil pressure.
141
signal voltage detected at engine oil pressure
circuit.
Engine oil rifle pressure - Data valid but below None on performance.
143 normal operational range - Moderately severe
level.
Engine coolant temperature 1 sensor circuit - Possible white smoke. Fan will stay ON if
Voltage above normal, or shorted to high controlled by ECM. No engine protection for
144
source. High signal voltage or open circuit engine coolant temperature.
detected at engine coolant temperature circuit.
3-22
Fault code No. Reason Effect (only when fault code is active)
Engine Coolant Temperature 1 Sensor Circuit - Possible white smoke. Fan will stay ON if
145 Voltage Below Normal, or Shorted to Low controlled by ECM. No engine protection for
Source. Low signal voltage detected at engine engine coolant temperature.
coolant temperature circuit.
Engine Coolant Temperature - Data Valid but Progressive power derate increasing in
Above Normal Operational Range - Moderately severity from time of alert.
146 Severe Level. Engine coolant temperature signal
indicates engine coolant temperature is above
engine protection warning limit.
Accelerator Pedal or Lever Position 1 Sensor Severe derate in power output of the engine.
Circuit Frequency - Data Valid but Below Normal Limp home power only.
147 Operational Range - Most Severe Level. A
frequency of less than 100 Hz has been
detected at the frequency throttle input to the
ECM.
Accelerator Pedal or Lever Position Sensor 1 - Severe derate in power output of the engine.
Data Valid but Above Normal Operational Limp home power only.
148 Range - Most Severe Level. A frequency of
more than 1500 Hz has been detected at the
frequency throttle input to the ECM.
Engine Coolant Temperature - Data Valid but Progressive power derate increasing in
Above Normal Operational Range - Most severity from time of alert. If Engine Protection
151 Severe Level. Engine coolant temperature signal Shutdown feature is enabled, engine will shut
indicates engine coolant temperature above down 30 seconds after Red Stop Lamp starts
engine protection critical limit. flashing.
Intake Manifold 1 Temperature Sensor Circuit - Possible white smoke. Fan will stay ON if
153 Voltage Above Normal, or Shorted to High controlled by ECM. No engine protection for
Source. High signal voltage detected at intake intake manifold air temperature.
manifold air temperature circuit.
Intake Manifold 1 Temperature Sensor Circuit - Possible white smoke. Fan will stay ON if
154 Voltage Below Normal, or Shorted to Low controlled by ECM. No engine protection for
Source. Low signal voltage detected at intake intake manifold air temperature.
manifold air temperature circuit.
Intake Manifold 1 Temperature - Data Valid but Progressive power derate increasing in
Above Normal Operational Range - Most severity from time of alert. If Engine Protection
155 Severe Level. Intake manifold air temperature Shutdown feature is enabled, engine will shut
signal indicates intake manifold air temperature down 30 seconds after Red Stop Lamp starts
above engine protection critical limit. flashing.
Sensor Supply 2 Circuit - Voltage Below Normal, Engine power derate.
187 or Shorted to Low Source. Low voltage detected
at the sensor supply number 2 circuit.
Coolant Level Sensor 1 Circuit - Voltage Above None on performance.
195 Normal, or Shorted to High Source. High signal
voltage detected at engine coolant level circuit.
Coolant Level Sensor 1 Circuit - Voltage Below None on performance.
196 Normal, or Shorted to Low Source. Low signal
voltage detected at engine coolant level circuit.
Coolant Level - Data Valid but Below Normal None on performance.
197 Operational Range - Moderately Severe Level.
Low coolant level has been detected.
Barometric Pressure Sensor Circuit - Voltage Engine power derate.
221 Above Normal, or Shorted to High Source. High
signal voltage detected at barometric pressure
circuit.
3-23
Fault code No. Reason Effect (only when fault code is active)
Barometric Pressure Sensor Circuit - Voltage Engine power derate.
222 Below Normal, or Shorted to Low Source. Low
signal voltage detected at barometric pressure
circuit.
Engine Crankshaft Speed/Position - Data Valid Fuel injection disabled until engine speed falls
234 but Above Normal Operational Range - Most below the overspeed limit.
Severe Level. Engine speed signal indicates
engine speed above engine protection limit.
Coolant Level - Data Valid but Below Normal Progressive power derate increasing in
Operational Range - Most Severe Level. Low severity from time of alert. If Engine Protection
235 engine coolant level detected. Shutdown feature is enabled, engine will shut
down 30 seconds after Red Stop Lamp starts
flashing.
External Speed Command Input (Multiple Unit
Synchronization) - Data Erratic, Intermittent, or
237 Incorrect. Communication between multiple
engines may be intermittent.
Sensor Supply 3 Circuit - Voltage Below Normal, Possible hard starting and rough running.
or Shorted to Low Source. Low voltage detected
238 on the +5 volt sensor supply circuit to the engine
speed sensor.
Wheel-based vehicle speed - Data erratic, Engine speed limited to ,mximum engine
intermittent, or incorrect. The ECM lost the speed without VSS parameter value. Cruise
241 vehicle speed signal. control, gear-down protection, and road speed
governor will not work.
Wheel-based vehicle speed sensor circuit Engine speed limited to maximum engine
tampering has been detected - Abnormal rate of speed without VSS parameter value. Cruise
242 change. Signal indicates an intermittent control, gear-down protection, and road speed
connection or VSS tampering. g+H53overnor will not work.
Fan control circuit - Voltage below normal, or The fan may stay on continuously or not run at
shorted to low source. Low signal voltage all.
245 detected at the fan control circuit when
commanded on.
Fuel pump pressurizing assembly 1 circuit - Engine will run poorly at idle. Engine will have
Voltage below normal, or shorted to low source. low power. Fuel pressure will be higher than
271 Low signal voltage detected at the fuel pump commanded.
actuator circuit.
Fuel pump pressurizing assembly 1 circuit - Engine will not run or engine will run poorly.
Voltage above normal, or shorted to high
272 source. High signal voltage or open circuit
detected at the fuel pump actuator circuit.
Fuel pump pressurizing assembly 1 - Engine will not run or possible low power.
281 Mechanical system not responding properly or
out of adjustment.
SAE J1939 multiplexing PGN timeout error - At least one multiplexed device will not operate
Abnormal update rate. The ECM expected properly.
285 information from a multiplexed device but did not
receive it soon enough or did not receive it at all.
SAE J1939 multiplexing configuration error - Out At least one multiplexed device will not operate
of calibration. The ECM expected information properly.
286 from a multiplexed device but only received a
portion of the necessary information.
SAE J1939 multiplexed accelerator pedal or Engine may only idle or engine will not
lever sensor system - received network data In accelerate to full speed.
287 error. The OEM vehicle electronic control unit
(VECU) detected a fault with its accelerator
pedal.
3-24
Fault code No. Reason Effect (only when fault code is active)
SAE J1939 Multiplexing Remote Accelerator The engine will not respond to the remote
Pedal or Lever Position Sensor Circuit - throttle. Engine may only idle. The primary or
288 Received Network Data In Error. The OEM cab accelerator may be able to be used.
vehicle electronic control unit (VECU) detected a
fault with the remote accelerator.
292 Auxiliary temperature Sensor Input 1 - Special Possible engine power derate.
instructions.
Auxiliary temperature sensor input 1 circuit - None on performance.
Voltage above normal, or shorted to high
293 source. High signal voltage or open circuit
detected at the OEM auxiliary temperature
circuit.
Auxiliary temperature sensor input 1 circuit - None on performance.
294 Voltage below normal, or shorted to low source.
Low signal voltage detected at the OEM
auxiliary temperature circuit.
296 Auxiliary pressure sensor input 1 - Special Possible engine power derate.
instructions.
Auxiliary pressure sensor input 1 circuit - Voltage None on performance.
297 above normal, or shorted to high source. High
signal voltage detected at the OEM pressure
circuit.
Auxiliary pressure sensor input 1 circuit - Voltage None on performance.
298 below normal, or shorted to low source. Low
signal voltage or open circuit detected at the
OEM pressure circuit.
Real time clock power interrupt - Data erratic, None on performance. Data in the ECM will
319 intermittent, or incorrect. Real time clock lost not have accurate time and date information.
power.
Injector solenoid driver cylinder 1 circuit - Engine can possibly misfire or run rough.
Current below normal, or open circuit. High
322 resistance detected on injector number 1 circuit
or no current detected at number 1 injector driver
or return pin when the voltage supply at the
harness is on.
Injector solenoid driver cylinder 5 circuit - Engine can possibly misfire or run rough.
Current below normal, or open circuit. High
323 resistance detected on injector number 5 circuit
or no current detected at number 5 injector driver
or return pin when the voltage supply at the
harness is on.
Injector solenoid driver cylinder 3 circuit - Engine can possibly misfire or run rough.
Current below normal, or open circuit. High
324 resistance detected on injector number 3 circuit
or no current detected at number 3 injector driver
or return pin when the voltage supply at the
harness is on.
Injector solenoid driver cylinder 6 circuit - Engine can possibly misfire or run rough.
Current below normal, or open circuit. High
325 resistance detected on injector number 6 circuit
or no current detected at number 6 injector driver
or return pin when the voltage supply at the
harness is on.
3-25
Fault code No. Reason Effect (only when fault code is active)
Injector solenoid driver cylinder 2 circuit - Engine can possibly misfire or run rough.
Current below normal, or open circuit. High
331 resistance detected on injector number 2 circuit
or no current detected at number 2 injector driver
or return pin when the voltage supply at the
harness is on.
Injector solenoid driver cylinder 4 circuit - Engine can possibly misfire or run rough.
Current below normal, or open circuit. High
332 resistance detected on injector number 4 circuit
or no current detected at number 4 injector driver
or return pin when the voltage supply at the
harness is on.
Engine coolant temperature - Data erratic, The ECM will estimate engine coolant
334 intermittent, or incorrect. The engine coolant temperature.
temperature reading is not changing with engine
operating conditions.
Electronic calibration code incompatibilty - Out of Possible no noticeable performance effects,
342 calibration. An incompatible calibration has been engine dying, or hard starting.
detected in the ECM.
Engine control module warning internal No perfomance effects or possible severe
343 hardware failure - Bad intelligent device or power derate.
component. Internal ECM failure.
Injector power supply - Bad intelligent device or Possible smoke, low power, engine misfire,
351 component. The ECM measured injector boost and/or engine will not start.
voltage is low.
Sensor supply 1 circuit - Voltage below normal, Engine power derate.
352 or shorted to low source. Low voltage detected
at sensor supply number 1 circuit.
Sensor supply 1 circuit - Voltage above normal, Engine power derate.
386 or shorted to high source. High voltage detected
at sensor supply number 1 circuit.
Engine oil rifle pressure - Data valid but below Progressive power derate increasing in
normal operational range - Most severe level. Oil severity from time of alert. If engine protection
415 pressure signal indicates oil pressure below the shutdown feature is enabled, engine will shut
engine protection critical limit. down 30 seconds after red stop lamp starts
flashing.
Water in fuel indicator - Data valid but above Possible white smoke, loss of power, or hard
418 normal operational range - Least severe level. starting.
water has been detected in the fuel filter.
Water in fuel indicator sensor circuit - Voltage None on performance. No water in fuel
428 above normal, or shorted to high source. High warning available.
voltage detected at the water in fuel circuit.
Water in fuel indicator sensor circuit - Voltage None on performance. No water in fuel
429 below normal, or shorted to low source. Low warning available.
voltage detected at the water in fuel circuit.
Accelerator pedal or lever idle validation switch - Engine will only idle.
431 Data erratic, intermittent, or incorrect. Voltage
detected simultaneously on both idle validation
and off-idle validation switches.
Accelerator pedal or lever idle validation circuit - Engine will only idle.
432 Out of calibration. Voltage at idle validation on-
idle and off-idle circuit does not match
accelerator pedal position.
Engine oil rifle pressure - Data erratic, None on performance. No engine protection
435 intermittent, or incorrect. An error in the engine for oil pressure.
oil pressure switch signal was detected by the
ECM.
3-26
Fault code No. Reason Effect (only when fault code is active)
Battery 1 voltage - Data valid but below normal Engine may stop running or be difficult to start.
operational range - Moderately severe level.
441
ECM supply voltage is below the minimum
system voltage level.
Battery 1 Voltage - Data valid but above normal Possible electrical damage to all electrical
operational range - Moderately severe level. components.
442
ECM supply voltage is above the maximum
system voltage level.
Injector metering rail 1 pressure - Data valid but None or possible engine noise associated with
449 above normal operational range - Most severe higher injection pressures (especially at idle or
level. light load). Engine power is reduced.
Injector metering rail 1 pressure sensor circuit - Power and or speed derate.
Voltage above normal, or shorted to high
451
source. High signal voltage detected at the rail
fuel pressure sensor circuit.
Injector metering rail 1 pressure sensor circuit - Power and or speed derate.
Voltage below normal, or shorted to low
452
source. Low signal voltage detected at the rail
fuel pressure sensor circuit.
Intake manifold 1 temperature - Data valid but Progressive power derate increasing in
above normal operational range - Moderately severity from time of alert.
488 severe level. Intake manifold air temperature
signal indicates intake manifold air temperature
is above the engine protection warning limit.
Multiple unit synchronization switch - Data
497
erratic, intermittent, or incorrect.
Auxiliary intermediate (PTO) speed switch None on performance.
523 validation - Data erratic, intermittent, or
incorrect.
Auxiliary input/output 2 circuit - Voltage above None on performance.
normal, or shorted to high source. High signal
527
voltage or open circuit has been detected at the
auxiliary input/output 2 circuit.
Auxiliary alternate torque validation switch - None on performance.
528
Data erratic, intermittent, or incorrect.
Auxiliary input/output 3 circuit - Voltage above
normal, or shorted to high source. Low signal
529
voltage has been detected at the auxiliary
input/output 2 circuit.
Injector metering rail 1 pressure - Data valid but The ECM will estimate fuel pressure and
above normal operational range - Moderately power is reduced.
553
severe level. The ECM has detected that fuel
pressure is higher than commanded pressure.
Injector metering rail 1 pressure - Data erratic, Possibly hard to start, low power, or engine
Intermittent, or incorrect. The ECM has smoke.
554
detected that the fuel pressure signal is not
changing.
Injector metering rail 1 pressure - Data Valid Either the engine will not start or the engine
but Below Normal Operational Range - will not have starter lockout protection.
559 Moderately Severe Level. The ECM has
detected that fuel pressure is lower than
commanded pressure.
Starter relay driver circuit - Voltage above The engine will not have starter lockout
normal, or shorted to high source. Open circuit protection.
584
or high voltage detected at starter lockout
circuit.
3-27
Fault code No. Reason Effect (only when fault code is active)
Starter relay driver circuit - Voltage below Engine power derate. The ECM uses an
585 normal, or shorted to low source. Low voltage estimated turbocharger speed.
detected at starter lockout circuit.
Turbocharger 1 speed - Data valid but above Amber lamp will light until high battery voltage
normal operational range - Moderately severe condition is corrected.
595
level. High turbocharger speed has been
detected.
Auxiliary commanded dual output shutdown - None or possible engine noise associated with
599 Special instructions. higher injection pressures (especially at idle or
light load). Engine power is reduced.
Turbocharger 1 speed - Data valid but below Engine can run rough. Possibly poor starting
normal operational range - Moderately severe capability. Engine runs using backup speed
687
level. Low turbocharger speed detected by the sensor. Engine power is reduced.
ECM.
Engine crankshaft speed/position - Data erratic, Engine power derate.
689 intermittent, or incorrect. Loss of signal from
crankshaft sensor.
Turbocharger 1 compressor inlet temperature Engine power derate.
circuit - Voltage above normal, or shorted to
691 high source. High signal voltage detected at
turbocharger compressor inlet air temperature
circuit.
Turbocharger 1 compressor inlet temperature Engine will run derated. Excessive black
circuit - Voltage below normal, or shorted to low smoke, hard start, and rough idle possible.
692
source. Low signal voltage detected at
turbocharger compressor inlet air tempera
Engine speed / position camshaft and Possible no noticeable performance effects,
crankshaft misalignment - Mechanical system engine dying, or hard starting.
not responding properly or out of adjustment.
731
mechanical misalignment between the
crankshaft and camshaft engine speed
sensors.
Electronic control module data lost - Condition Possible poor starting. Engine power derate.
757
exists. Severe loss of data from the ECM.
Engine camshaft speed / position sensor - Data Possible engine power derate.
erratic, intermittent, or incorrect. The ECM has
778
detected an error in the camshaft position
sensor signal.
Auxiliary equipment sensor input 3 - Root Possible no noticeable performance effects or
cause not known. engine dying or hard starting. Fault
779
information, trip information, and maintenance
monitor data may be inaccurate.
Power supply lost with ignition on - Data erratic, Engine will shut down.
intermittent, or incorrect. Supply voltage to the
ECM fell below 6.2 volts momentarily, or the
1117
ECM was not allowed to power down correctly
(retain battery voltage for 30 seconds after key
OFF).
OEM datalink cannot transmit - Data erratic, Engine will only idle.
1633 intermittent, or incorrect. Communications
within the OEM datalink network is intermittent.
Sensor supply 4 circuit - Voltage sbove normal, Engine will only idle.
or shorted to high source. High voltage
2185
detected at +5 volt sensor supply circuit to the
accelerator pedal position sensor.
3-28
Fault code No. Reason Effect (only when fault code is active)
Sensor supply 4 circuit - Voltage below normal, Possibly hard to start, low power, or engine
or shorted to low source. Low voltage detected smoke.
2186
at +5 volt sensor supply circuit to the
accelerator pedal position sensor.
Injector metering rail 1 pressure - Data valid but Engine may be difficult to start.
below normal operational range - Most severe
2249
level. The ECM has detected that fuel pressure
is lower than commanded pressure.
Electric lift pump for engine fuel supply circuit - Engine may be difficult to start.
Voltage above normal, or shorted to high
2265
source. High voltage or open detected at the
fuel lift pump signal circuit.
Electric lift pump for engine fuel supply circuit - Possible low power.
Voltage below normal, or shorted to low
2266
source. Low signal voltage detected at the fuel
lift pump circuit.
Electronic fuel injection control valve circuit - Engine may exhibit misfire as control switches
Condition exists. Fuel pump actuator circuit from the primary to the backup speed sensor.
2311
resistance too high or too low. Engine power is reduced while the engine
operates on the backup speed sensor.
Engine crankshaft speed/position - Data erratic, Possible low power.
2321 intermittent, or incorrect. crankshaft engine
speed sensor intermittent synchronization.
Engine camshaft speed / position sensor - Data Engine power derate.
erratic, intermittent, or incorrect. Camshaft
2322 engine speed sensor intermittent
synchronization.
Turbocharger 1 Speed - Abnormal rate of Engine power derate.
2345 change. The turbocharger speed sensor has
detected an erroneous speed value.
Turbocharger turbine inlet temperature Engine power derate.
(Calculated) - Data valid but above normal
2346 operational range - Least severe level.
Turbocharger turbine inlet temperature has
exceeded the engine protection limit.
Turbocharger compressor outlet temperature Engine brake on cylinders 1, 2, and 3 can not
2347 (Calculated) - Data valid but above normal be activated or exhaust brake will not operate.
operational range - Least severe level.
Fan control circuit - Voltage above normal, or Variable geometry turbocharger will go to the
2377 shorted to high source. Open circuit or high open position.
voltage detected at the fan control circuit.
VGT actuator driver circuit - Voltage below Variable geometry turbocharger may be in
2384 normal, or shorted to low source. Low voltage either the open or closed position.
detected at turbocharger control valve circuit.
VGT actuator driver circuit - Voltage above The intake air heaters may be ON or OFF all
normal, or shorted to high source. Open circuit the time.
2385 or high voltage detected at turbocharger control
valve circuit.
Intake air heater 1 circuit - Voltage above The intake air heaters may be ON or OFF all
2555 normal, or shorted to high source. High voltage the time.
detected at the intake air heater signal circuit.
Intake air heater 1 circuit - Voltage below Can not control transmission.
2556 normal, or shorted to low source. Low voltage
detected at the intake air heater signal circuit.
Auxiliary PWM driver 1 circuit - Voltage above Can not control transmission.
2557 normal, or shorted to high source. High signal
voltage detected at the analog torque circuit.
3-29
Fault code No. Reason Effect (only when fault code is active)
Auxiliary PWM driver 1 circuit - Voltage below Power derate and possible engine shutdown if
2558 normal, or shorted to low source. Low signal engine protection shutdown feature is enabled.
voltage detected at the analog torque circuit.
Intake manifold 1 pressure - Data erratic,
intermittent, or incorrect. The ECM has
2973 detected an intake manifold pressure signal
that is too high or low for current engine
operating conditions.
3-30
(7) DEFINITION OF OPERATING MODES
① Normal
There's no failure detected in the transmission system or the failure has no or slight effects on
transmission control. TCU will work without or in special cases with little limitations.(See
following table)
② Substitute clutch control
TCU can't change the gears or the direction under the control of the normal clutch modulation.
TCU uses the substitute strategy for clutch control. All modulations are only time controlled.
(Comparable with EST 25)
③ Limp-home
The detected failure in the system has strong limitations to transmission control. TCU can
engage only one gear in each direction. In some cases only one direction will be possible.
TCU will shift the transmission into neutral at the first occurrence of the failure. First, the operator
must shift the gear selector into neutral position.
If output speed is less than a threshold for neutral to gear and the operator shifts the gear
selector into forward or reverse, the TCU will select the limp-home gear.
If output speed is less than a threshold for reversal speed and TCU has changed into the limp-
home gear and the operator selects a shuttle shift, TCU will shift immediately into the limp-home
gear of the selected direction.
If output speed is greater than the threshold, TCU will shift the transmission into neutral. The
operator has to slow down the vehicle and must shift the gear selector into neutral position.
④ Transmission-shutdown
TCU has detected a severe failure that disables control of the transmission.
TCU will shut off the solenoid valves for the clutches and also the common power supply(VPS1).
Transmission shifts to neutral. The park brake will operate normally, also the other functions
which use ADM1 to ADM8.
The operator has to slow down the vehicle. The transmission will stay in neutral.
⑤ TCU-shutdown
TCU has detected a severe failure that disables control of system.
TCU will shut off all solenoid valves and also both common power supplies(VPS1, VPS2). The
park brake will engage, also functions are disabled which use ADM 1 to ADM 8.
The transmission will stay in neutral.
※ Abbreviations
OC : Open circuit
SC : Short circuit
OP mode : Operating mode
TCU : Transmission control unit
EEC : Electronic engine controller
PTO : Power take off
3-31
(8) Transmission fault codes
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
11 Logical error at gear range signal TCU shifts transmission to ⧣Check the cables from TCU to Failure cannot be detected in
TCU detected a wrong signal combination neutral shift lever systems with DW2/DW3 shift
for the gear range OP-mode : Transmission ⧣Check signal combinations of lever
⧣Cable from shift lever to TCU is broken shutdown shift lever positions for gear Fault is taken back if TCU
⧣Cable is defective and is contacted to range detects a valid signal for the
battery voltage or vehicle ground position
⧣Shift lever is defective
12 Logical error at direction select signal TCU shifts transmission to ⧣Check the cables from TCU to Fault is taken back if TCU
TCU detected a wrong signal combination neutral shift lever detects a valid signal for the
for the direction direction at the shift lever
⧣Cable from shift lever to TCU is broken OP-Mode : Transmission ⧣Check signal combinations of
⧣Cable is defective and is contacted to shutdown shift lever positions F-N-R
battery voltage or vehicle ground
⧣Shift lever is defective
13 Logical error at engine derating device After selecting neutral, TCU ⧣Check engine derating device This fault is reset after power
TCU detected no reaction of engine while change to OP mode limp home up of TCU
derating device active
15 Logical error at direction select signal 2 TCU shifts transmission to ⧣Check the cables from TCU to Fault is taken back if TCU
shift lever neutral if selector active shift lever 2 detects a valid neutral signal
TCU detected a wrong signal combination OP mode : Transmission ⧣Check signal combinations of for the direction at the shift
for the direction shutdown if selector shift lever positions F-N-R lever
⧣Cable from shift lever 2 to TCU is broken active
⧣Cable is defective and is contacted to
battery voltage or vehicle ground
⧣Shift lever is defective
16 Logical error at axle connection OP mode : Normal ⧣Check the cables from TCU to
Feedback axle connection measured by TCU feedback axle connection switch
and output signal axle connection don't fit ⧣Check signals of the feedback
⧣Axle can't be connected or disconnected axle connection switch
due to mechanical problem
⧣One of the cables from feedback axle
connection switch to TCU is broken
3-32
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
21 S.C. to battery voltage at clutch cut off input Clutch cut off function is disabled ⧣Check the cable from TCU to
The measured voltage is too high: OP mode : Normal the sensor
⧣Cable is defective and is contacted to ⧣Check the connectors
battery voltage ⧣Check the clutch cut off sensor
⧣Clutch cut off sensor has an internal defect
⧣Connector pin is contacted to battery voltage
22 S.C. to ground or O.C. at clutch cut off input Clutch cut off function is disabled ⧣Check the cable from TCU to
The measured voltage is too low: OP mode : Normal the sensor
⧣Cable is defective and is contacted to ⧣Check the connectors
vehicle ground ⧣Check the clutch cut off sensor
⧣Cable has no connection to TCU
⧣Clutch cut off sensor has an internal
defect
⧣Connector pin is contacted to vehicle
ground or is broken
23 S.C. to battery voltage at load sensor input Retarder function is affected ⧣Check the cable from TCU to Availability of retarder
The measured voltage is too high: TCU uses default load the sensor depends on default load
⧣Cable is defective and is contacted to OP mode : Normal ⧣Check the connectors
battery voltage ⧣Check the load sensor
⧣Load sensor has an internal defect ⧣Check the assembly tolerances
⧣Connector pin is contacted to battery voltage of load sensor
24 S.C. to ground or O.C. at load sensor input Retarder function is affected ⧣Check the cable from TCU to Availability of retarder
The measured voltage is too low: TCU use default load the sensor depends on default load
⧣Cable is defective and is contacted to OP mode : Normal ⧣Check the connectors
vehicle ground ⧣Check the load sensor
⧣Cable has no connection to TCU ⧣Check the assembly tolerances
⧣Load sensor has as internal defect of load sensor
⧣Connector pin is contacted to vehicle
ground or is broken
3-33
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
25 S.C. to battery voltage or O.C. at No reaction, TCU use default ⧣Check the cable from TCU to
transmission sump temperature sensor input temperature the sensor
The measured voltage is too high: OP mode : Normal ⧣Check the connectors
⧣Cable is defective and is contacted to ⧣Check the temperature sensor
battery voltage
⧣Cable has no connection to TCU
⧣Temperature sensor has an internal defect
⧣Connector pin is contacted to battery
voltage or is broken
26 S .C. to battery voltage or O.C. at No reaction, TCU uses default ⧣Check the cable from TCU to
transmission sump temperature sensor input temperature the sensor
The measured voltage is too low: OP mode : Normal ⧣Check the connectors
⧣Cable is defective and is contacted to ⧣Check the temperature sensor
vehicle ground
⧣Temperature sensor has an internal defect
⧣Connector pin is contacted to vehicle
ground
27 S.C. to battery voltage or O.C. at retarder No reaction, TCU uses default ⧣Check the cable from TCU to
temperature sensor input temperature the sensor
The measured voltage is too high: OP mode : Normal ⧣Check the connectors
⧣Cable is defective and is contacted to ⧣Check the temperature sensor
battery voltage
⧣Cable has no connection to TCU
⧣Temperature sensor has an internal defect
⧣Connector pin is contacted to battery
voltage or is broken
28 S.C. to ground at retarder temperature No reaction, TCU uses default ⧣Check the cable from TCU to
sensor input temperature the sensor
The measured voltage is too low: OP mode : Normal ⧣Check the connectors
⧣Cable is defective and is contacted to ⧣Check the temperature sensor
vehicle ground
⧣Temperature sensor has an internal defect
⧣Connector pin is contacted to vehicle ground
3-34
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
27 S.C. to battery voltage or O.C. at No reaction, TCU uses default ⧣Check the cable from TCU to
converter output temperature sensor input temperature the sensor
The measured voltage is too high: OP mode : Normal ⧣Check the connectors
⧣Cable is defective and is contacted to ⧣Check the temperature sensor
battery voltage
⧣Cable has no connection to TCU
⧣Temperature sensor has an internal defect
⧣Connector pin is contacted to battery
voltage or is broken
28 S .C. to ground at converter output No reaction, TCU uses default ⧣Check the cable from TCU to
temperature sensor input temperature the sensor
The measured voltage is too low: OP mode : Normal ⧣Check the connectors
⧣Cable is defective and is contacted to ⧣Check the temperature sensor
vehicle ground
⧣Temperature sensor has an internal defect
⧣Connector pin is contacted to vehicle ground
31 S.C. to battery voltage or O.C. at engine OP mode : Substitute clutch control ⧣Check the cable from TCU to
speed input the sensor
TCU measures a voltage higher than 7.00V ⧣Check the connectors
at speed input pin ⧣Check the speed sensor
⧣Cable is defective and is contacted to
battery voltage
⧣Cable has no connection to TCU
⧣Speed sensor has an internal defect
⧣Connector pin is contacted to battery
voltage or has no contact
32 S.C. to ground at engine speed input OP mode : Substitute clutch control ⧣Check the cable from TCU to
TCU measures a voltage less than 0.45V at the sensor
speed input pin ⧣Check the connectors
⧣Cable/connector is defective and is ⧣Check the speed sensor
contacted to vehicle ground
⧣Speed sensor has an internal defect
3-35
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
33 Logical error at engine speed input OP mode : Substitute clutch control ⧣Check the cable from TCU to This fault is reset after power
TCU measures a engine speed over a the sensor up of TCU
threshold and the next moment the ⧣Check the connectors
measured speed is zero ⧣Check the speed sensor
⧣Cable/connector is defective and has bad ⧣Check the sensor gap
contact
⧣Speed sensor has an internal defect
⧣Sensor gap has the wrong size
34 S.C. to battery voltage or O.C. at turbine OP mode : Substitute clutch control ⧣Check the cable from TCU to
speed input If a failure is existing at output the sensor
TCU measures a voltage higher than 7.00V speed, ⧣Check the connectors
at speed input pin TCU shifts to neutral ⧣Check the speed sensor
⧣Cable is defective and is contacted to OP mode : Limp home
vehicle battery voltage
⧣Cable has no connection to TCU
⧣Speed sensor has an internal defect
⧣Connector pin is contacted to battery
voltage or has no contact
35 S.C. to ground at turbine speed input OP mode : Substitute clutch control ⧣Check the cable from TCU to This fault is reset after power
TCU measures a voltage less than 0.45V at If a failure is existing at output the sensor up of TCU
speed input pin speed, ⧣Check the connectors
⧣Cable/connector is defective and is TCU shifts to neutral ⧣Check the speed sensor
contacted to vehicle ground OP mode : Limp home
⧣Speed sensor has an internal defect
36 Logical error at turbine speed input OP mode : Substitute clutch control ⧣Check the cable from TCU to
TCU measures a turbine speed over a If a failure is existing at output the sensor
threshold and at the next moment the speed, ⧣Check the connectors
measured speed is zero TCU shifts to neutral ⧣Check the speed sensor
⧣Cable/connector is defective and has bad OP mode : Limp home ⧣Check the sensor gap
contact
⧣Speed sensor has an internal defect
⧣Sensor gap has the wrong size
3-36
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
37 S.C. to battery voltage or O.C. at internal OP mode : Substitute clutch control ⧣Check the cable from TCU to
speed input the sensor
TCU measures a voltage higher than 7.00V ⧣Check the connectors
at speed input pin ⧣Check the speed sensor
⧣Cable is defective and is contacted to
vehicle battery voltage
⧣Cable has no connection to TCU
⧣Speed sensor has an internal defect
⧣Connector pin is contacted to battery
voltage or has no contact
38 S.C. to ground at turbine speed input OP mode : Substitute clutch control ⧣Check the cable from TCU to
TCU measures a voltage less than 0.45V at the sensor
speed input pin ⧣Check the connectors
⧣Cable/connector is defective and is ⧣Check the speed sensor
contacted to vehicle ground
⧣Speed sensor has an internal defect
39 Logical error at internal speed input OP mode : Substitute clutch control ⧣Check the cable from TCU to This fault is reset after power
TCU measures a internal speed over a the sensor up of TCU
threshold and at the next moment the ⧣Check the connectors
measured speed is zero ⧣Check the speed sensor
⧣Cable/connector is defective and has bad ⧣Check the sensor gap
contact
⧣Speed sensor has an internal defect
⧣Sensor gap has the wrong size
3A S.C. to battery voltage or O.C. at output Special mode for gear selection ⧣Check the cable from TCU to
speed input OP mode : Substitute clutch control the sensor
TCU measures a voltage higher than 12.5V If a failure is existing at turbine ⧣Check the connectors
at speed input pin speed, ⧣Check the speed sensor
⧣Cable is defective and is contacted to TCU shifts to neutral
battery voltage OP mode : lamp home
⧣Cable has no connection to TCU
⧣Speed sensor has an internal defect
⧣Connector pin is contacted to battery
voltage or has no contact
3-37
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
3B S.C. to ground at output speed input Special mode for gear selection ⧣Check the cable from TCU to
TCU measures a voltage less than 1.00V at OP mode : Substitute clutch control the sensor
speed input pin If a failure is existing at turbine ⧣Check the connectors
⧣Cable/connector is defective and is speed, ⧣Check the speed sensor
contacted to vehicle ground TCU shifts to neutral
⧣Speed sensor has an internal defect OP mode : lamp home
3C Logical error at output speed input Special mode for gear selection ⧣Check the cable from TCU to This fault is reset after power
TCU measures a turbine speed over a OP mode : Substitute clutch control the sensor up of TCU
threshold and at the next moment the If a failure is existing at turbine ⧣Check the connectors
measured speed is zero speed, ⧣Check the speed sensor
⧣Cable/connector is defective and has bad TCU shifts to neutral ⧣Check the sensor gap
contact OP mode : lamp home
⧣Speed sensor has an internal defect
⧣Sensor gap has the wrong size
3E Output speed zero doesn't fit to other Special mode for gear selection ⧣Check the sensor signal of This fault is reset after power
speed signals OP mode : Substitute clutch control output speed sensor up of TCU
If transmission is not neutral and the shifting If a failure is existing at turbine ⧣Check the sensor gap of
has finished, speed, output speed sensor
TCU measures output speed zero and TCU shifts to neutral ⧣Check the cable from TCU to
turbine speed or internal speed not equal to OP mode : lamp home the sensor
zero.
⧣Speed sensor has an internal defect
⧣Sensor gap has the wrong size
3-38
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
71 S.C. to battery voltage at clutch K1 TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve is OP mode : Limp home the gearbox
out of limit, the voltage at K1 valve is too high If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has pending TCU to the gearbox
contact to battery voltage TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Cable/connector is defective and has OP mode : TCU shutdown ⧣Check internal wire harness of
contact to another regulator output of the the gearbox
TCU
⧣Regulator has an internal defect
72 S.C. to ground at clutch K1 TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve is OP mode : Limp home the gearbox
out of limit, the voltage at K1 valve is too low If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has pending gearbox to TCU
contact to vehicle ground TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Regulator has an internal defect OP mode : TCU shutdown ⧣Check internal wire harness of
the gearbox
73 O.C. at clutch K1 TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve OP mode : Limp home the gearbox
is out of limit If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has no pending gearbox to TCU
contact to TCU TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Regulator has an internal defect OP mode : TCU shutdown ⧣Check internal wire harness of
the gearbox
74 S.C. to battery voltage at clutch K2 TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve OP mode : Limp home the gearbox
is out of limit, the voltage at K2 valve is too If failure at another clutch is ⧣Check the connectors from
high pending gearbox to TCU
⧣Cable/connector is defective and has TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
contact to battery voltage OP mode : TCU shutdown ⧣Check internal wire harness of
⧣Cable/connector is defective and has the gearbox
contact to another regulator output of the
TCU
⧣Regulator has an internal defect
3-39
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
75 S.C. to ground at clutch K2 TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve is OP mode : Limp home the gearbox
out of limit, the voltage at K2 valve is too low If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has pending gearbox to TCU
contact to vehicle ground TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Regulator has an internal defect OP mode : TCU shutdown ⧣Check internal wire harness of
the gearbox
76 O.C. at clutch K2 TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve OP mode : Limp home the gearbox
is out of limit If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has no pending gearbox to TCU
contact to TCU TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Regulator has an internal defect OP mode : TCU shutdown ⧣Check internal wire harness of
the gearbox
77 S.C. to battery voltage at clutch K3 TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve OP mode : Limp home the gearbox
is out of limit, the voltage at K3 valve is too If failure at another clutch is ⧣Check the connectors from
high pending gearbox to TCU
⧣Cable/connector is defective and has TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
contact to battery voltage OP mode : TCU shutdown ⧣Check internal wire harness of
⧣Cable/connector is defective and has the gearbox
contact to another regulator output of the
TCU
⧣Regulator has an internal defect
78 S.C. to ground at clutch K3 TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve is OP mode : Limp home the gearbox
out of limit, the voltage at K3 valve is too low If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has pending gearbox to TCU
contact to vehicle ground TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Regulator has an internal defect OP mode : TCU shutdown ⧣Check internal wire harness of
the gearbox
3-40
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
79 O.C. at clutch K2 TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve OP mode : Limp home the gearbox
is out of limit If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has no pending gearbox to TCU
contact to TCU TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Regulator has an internal defect OP mode : TCU shutdown ⧣Check internal wire harness of
the gearbox
7D S.C. ground at engine derating device Engine derating will be on until ⧣Check the cable from TCU to Not used
⧣Cable is defective and is contacted to TCU power down even if fault the engine derating device
vehicle ground vanishes(Loose connection) ⧣Check the connectors from Not used
⧣Engine derating device has an internal defect OP mode : Normal engine derating device to TCU
⧣Connector pin is contacted to vehicle ground ⧣Check the resistance* of engine * See Chapter (9)
derating device
7E S.C. battery voltage at engine derating No reaction ⧣Check the cable from TCU to
device OP mode : Normal the engine derating device
⧣Cable/connector is defective and is ⧣Check the connectors from
contacted to battery voltage backup alarm device to TCU
⧣Engine derating device has an internal ⧣Check the resistance* of * See Chapter (9)
defect backup alarm device
7F O.C. at engine derating device No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal the engine derating device
pin, that looks like a O.C. for this output pin ⧣Check the connectors from
⧣Cable is defective and has no connection engine derating device to TCU
to TCU ⧣Check the resistance* of * See Chapter (9)
⧣Engine derating device has an internal engine derating device
defect
⧣Connector has no connection to TCU
3-41
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
81 S.C. to battery voltage at clutch K4 TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve OP mode : Limp home the gearbox
is out of limit, the voltage at K4 valve is too If failure at another clutch is ⧣Check the connectors from
high pending gearbox to TCU
⧣Cable/connector is defective and has TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
contact to battery voltage OP mode : TCU shutdown ⧣Check internal wire harness of
⧣Cable/connector is defective and has the gearbox
contact to another regulator output of the
TCU
⧣Regulator has an internal defect
82 S.C. to ground at clutch K4 TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve is OP mode : Limp home the engine derating device
out of limit, the voltage at K4 valve is too low If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has pending gearbox to TCU
contact to vehicle ground TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Regulator has an internal defect OP mode : TCU shutdown ⧣Check internal wire harness of
the gearbox
83 O.C. at clutch K4 TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve OP mode : Limp home the gearbox
is out of limit If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has pending gearbox to TCU
contact to TCU TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Regulator has an internal defect OP mode : TCU shutdown ⧣Check internal wire harness of
the gearbox
84 S.C. to battery voltage at clutch K4 TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve OP mode : Limp home the gearbox
is out of limit, the voltage at K4 valve is too If failure at another clutch is ⧣Check the connectors from
high pending gearbox to TCU
⧣Cable/connector is defective and has TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
contact to battery voltage OP mode : TCU shutdown ⧣Check internal wire harness of
⧣Cable/connector is defective and has the gearbox
contact to another regulator output of the
TCU
⧣Regulator has an internal defect
3-42
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
85 S.C. to ground at clutch KV TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve is OP mode : Limp home the gearbox
out of limit, the voltage at K4 valve is too low If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has pending gearbox to TCU
contact to vehicle ground TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Regulator has an internal defect OP mode : TCU shutdown ⧣Check internal wire harness of
the gearbox
86 O.C. at clutch KV TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve OP mode : Limp home the gearbox
is out of limit If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has pending gearbox to TCU
contact to TCU TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Regulator has an internal defect OP mode : TCU shutdown ⧣Check internal wire harness of
the gearbox
87 S.C. to battery voltage at clutch KR TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve OP mode : Limp home the gearbox
is out of limit, the voltage at KR valve is too high If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has pending gearbox to TCU
contact to battery voltage TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Cable/connector is defective and has contact OP mode : TCU shutdown ⧣Check internal wire harness of
to another regulator output of the TCU the gearbox
⧣Regulator has an internal defect
88 S.C. to ground at clutch KR TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve is OP mode : Limp home the gearbox
out of limit, the voltage at KR valve is too low If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has pending gearbox to TCU
contact to vehicle ground TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Regulator has an internal defect OP mode : TCU shutdown ⧣Check internal wire harness of
the gearbox
89 O.C. at clutch KR TCU shifts to neutral ⧣Check the cable from TCU to
The measured resistance value of the valve OP mode : Limp home the gearbox
is out of limit If failure at another clutch is ⧣Check the connectors from
⧣Cable/connector is defective and has no pending gearbox to TCU
contact to TCU TCU shifts to neutral ⧣Check the regulator resistance* * See Chapter (9)
⧣Regulator has an internal defect OP mode : TCU shutdown ⧣Check internal wire harness of
the gearbox
3-43
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
91 S.C. to ground at relay reverse warning Backup alarm will be on until ⧣Check the cable from TCU to
alarm TCU power down even if fault the backup alarm device
TCU detected a wrong voltage at the output vanishes(Loose connection) ⧣Check the connectors from
pin, that looks like a S.C. to vehicle ground OP mode : Normal backup alarm device to TCU
⧣Cable is defective and is contact to vehicle ⧣Check the resistance* of * See Chapter (9)
ground backup alarm device
⧣Backup alarm device has an internal defect
⧣Connector pin is contacted to vehicle ground
92 S.C. to battery voltage at relay reverse No reaction ⧣Check the cable from TCU to
warning alarm OP mode : Normal the backup alarm device
TCU detected a wrong voltage at the output ⧣Check the connectors from
pin, that looks like a S.C. to battery voltage backup alarm device to TCU
⧣Cable is defective and is contacted to ⧣Check the resistance* of * See Chapter (9)
battery voltage backup alarm device
⧣Backup alarm device has an internal
defect
⧣Connector pin is contacted to battery
voltage
93 O.C. at relay reverse warning alarm No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal the backup alarm device
pin, that looks like a O.C. for this output pin ⧣Check the connectors from
⧣Cable is defective and has no connection backup alarm device to TCU
to TCU ⧣Check the resistance* of * See Chapter (9)
⧣Backup alarm device has an internal defect backup alarm device
⧣Connector has no connection to TCU
94 S.C. to ground at relay starter interlock No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal the stater interlock relay
pin, that looks like a S.C. to vehicle ground ⧣Check the connectors from
⧣Cable is defective and is connection to starter interlock relay to TCU
vehicle ground ⧣Check the resistance* of * See Chapter (9)
⧣Starter interlock relay has an internal defect starter interlock relay
⧣Connector pin is contacted to vehicle
ground
3-44
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
95 S.C. to battery voltage at relay starter No reaction ⧣Check the cable from TCU to
interlock OP mode : Normal the starter interlock relay
TCU detected a wrong voltage at the output ⧣Check the connectors from
pin, that looks like a S.C. to battery voltage starter interlock relay to TCU
⧣Cable is defective and has no connection ⧣Check the resistance* of * See Chapter (9)
to battery voltage starter interlock relay
⧣Starter interlock relay has an internal defect
⧣Connector pin is contacted to battery voltage
96 O.C. at relay starter interlock No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal the starter interlock relay
pin, that looks like a O.C. for this output pin ⧣Check the connectors from
⧣Cable is defective and has no connection starter interlock relay to TCU
to TCU ⧣Check the resistance* of * See Chapter (9)
⧣Starter interlock relay has an internal defect starter interlock relay
⧣Connector has no connection to TCU
97 S.C. to ground at park brake solenoid No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal the park brake solenoid
pin, that looks like a S.C. to vehicle ground ⧣Check the connectors from
⧣Cable is defective and is connection to park brake solenoid to TCU
vehicle ground ⧣Check the resistance* of park * See Chapter (9)
⧣Park brake solenoid has an internal defect brake solenoid
⧣Connector pin is contacted to vehicle
ground
98 S .C. to battery voltage at park brake No reaction ⧣Check the cable from TCU to
solenoid Optional : (Some customers) the park brake solenoid
TCU detected a wrong voltage at the output TCU shifts to neutral caused by ⧣Check the connectors from
pin, that looks like a S.C. to battery voltage park brake feed back park brake solenoid to TCU
⧣Cable is defective and is connection to OP mode : Normal ⧣Check the resistance* of park * See Chapter (9)
battery voltage brake solenoid
⧣Park brake solenoid has an internal defect
⧣Connector pin is contacted to battery
voltage
3-45
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
99 O.C. at park brake solenoid No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output Optional : Some customers the park brake solenoid
pin, that looks like a O.C. for this output pin TCU shifts to neutral caused by ⧣Check the connectors from
⧣Cable is defective and has no connection park brake feed back park brake solenoid to TCU
to TCU OP mode : Normal ⧣Check the resistance* of park * See Chapter (9)
⧣Park brake solenoid has an internal defect brake solenoid
⧣Connector has no connection to TCU
9A S.C. to ground at converter lock up clutch No reaction ⧣Check the cable from TCU to
solenoid OP mode : Normal the converter clutch solenoid
TCU detected a wrong voltage at the output ⧣Check the connectors from
pin, that looks like a S.C. to vehicle ground converter clutch solenoid to
⧣Cable is defective and is contacted to TCU
vehicle ground ⧣Check the resistance* of park * See Chapter (9)
⧣Converter clutch solenoid has an internal brake solenoid
defect
⧣Connector pin is contacted to vehicle ground
9B O.C. at converter lock up clutch solenoid Converter clutch always open, ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output retarder not available the converter clutch solenoid
pin, that looks like a O.C. for this output pin OP mode : Normal ⧣Check the connectors from
⧣Cable is defective and has no connection converter clutch solenoid to
to TCU TCU
⧣Converter clutch solenoid has an internal ⧣Check the resistance* of park * See Chapter (9)
defect brake solenoid
⧣Connector has no connection to TCU
9C S.C. to battery voltage at converter lock No reaction ⧣Check the cable from TCU to
up clutch solenoid OP mode : Normal the converter clutch solenoid
TCU detected a wrong voltage at the output ⧣Check the connectors from
pin, that looks like a S.C. to battery voltage converter clutch solenoid to
⧣Cable is defective and has no contacted TCU
to battery voltage ⧣Check the resistance* of * See Chapter (9)
⧣Converter clutch solenoid has an internal converter clutch solenoid
defect
⧣Connector pin is contacted to battery voltage
3-46
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
9D S.C. to ground at retarder solenoid No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal the retarder solenoid
pin, that looks like a S.C. to vehicle ground ⧣Check the connectors from
⧣Cable is defective and is contacted to retarder solenoid to TCU
vehicle ground ⧣Check the resistance* of * See Chapter (9)
⧣Retarder solenoid has an internal defect retarder solenoid
⧣Connector pin is contacted to vehicle
ground
9F S.C. to battery voltage at retarder solenoid No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal the retarder solenoid
pin, that looks like a S.C. to battery voltage ⧣Check the connectors from
⧣Cable is defective and has no connection retarder solenoid to TCU
to battery voltage ⧣Check the resistance* of * See Chapter (9)
⧣Retarder solenoid has an internal defect retarder solenoid
⧣Connector pin is contacted to battery voltage
3-47
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
A1 S.C. to ground at difflock or axle No reaction ⧣Check the cable from TCU to
connection solenoid OP mode : Normal the difflock solenoid
TCU detected a wrong voltage at the output ⧣Check the connectors from
pin, that looks like a S.C. to vehicle ground difflock solenoid to TCU
⧣Cable is defective and is contacted to ⧣Check the resistance* of * See Chapter (9)
vehicle ground difflock solenoid
⧣Difflock solenoid has an internal defect
⧣Connector pin is contacted to vehicle ground
A2 S.C. to battery voltage at difflock or axle No reaction ⧣Check the cable from TCU to
connection solenoid OP mode : Normal the difflock solenoid
TCU detected a wrong voltage at the output ⧣Check the connectors from
pin, that looks like a S.C. to battery voltage difflock solenoid to TCU
⧣Cable is defective and has no connection ⧣Check the resistance* of * See Chapter (9)
to battery voltage difflock solenoid
⧣Difflock solenoid has an internal defect
⧣Connector pin is contacted to battery voltage
A3 O.C. at difflock or axle connection solenoid No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal the difflock solenoid
pin, that looks like a O.C. for this output pin ⧣Check the connectors from
⧣Cable is defective and has no connection difflock solenoid to TCU
to TCU ⧣Check the resistance* of * See Chapter (9)
⧣Difflock solenoid has an internal defect difflock solenoid
⧣Connector has no connection to TCU
A4 S.C. to ground at warning signal output No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal the warning device
pin, that looks like a S.C. to vehicle ground ⧣Check the connectors from
⧣Cable is defective and is contacted to warning device to TCU
vehicle ground ⧣Check the resistance* of * See Chapter (9)
⧣Warning device has an internal defect warning device
⧣Connector pin is contacted to vehicle ground
3-48
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
A5 O.C. voltage at warning signal output No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal the warning device
pin, that looks like a O.C. for this output pin ⧣Check the connectors from
⧣Cable is defective and has no connection warning device to TCU
to TCU ⧣Check the resistance* of * See Chapter (9)
⧣Warning device has an internal defect warning device
⧣Connector has no connection to TCU
A6 S.C. to battery voltage at warning signal No reaction ⧣Check the cable from TCU to
output OP mode : Normal the warning device
TCU detected a wrong voltage at the output ⧣Check the connectors from
pin, that looks like a S.C. to battery voltage warning device to TCU
⧣Cable is defective and has is contacted to ⧣Check the resistance* of * See Chapter (9)
battery voltage warning device
⧣Warning device has an internal defect
⧣Connector pin is contacted to battery
voltage
3-49
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
3-50
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
3-51
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
3-52
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
BD S.C. to ground at engine brake solenoid No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal engine brake solenoid
pin, that looks like a S.C. to vehicle ground ⧣Check the connectors from
⧣Cable is defective and is contacted to engine brake solenoid to TCU
vehicle ground ⧣Check the resistance* of engine * See Chapter (9)
⧣Engine brake solenoid has an internal brake solenoid
defect
⧣Connector pin is contacted to vehicle ground
BE S.C. to battery voltage at engine brake No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal the engine brake solenoid
pin, that looks like a S.C. to battery voltage ⧣Check the connectors from
⧣Cable is defective and is contacted to engine brake solenoid to TCU
battery voltage ⧣Check the resistance* of engine * See Chapter (9)
⧣Engine brake solenoid has an internal defect brake solenoid
⧣Connector pin is contacted to battery voltage
3-53
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
C4 S.C. to ground at joystick status indicator No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal joystick status indicator
pin, that looks like a S.C. to vehicle ground ⧣Check the connectors from
⧣Cable is defective and is contacted to joystick status indicator to TCU
vehicle ground ⧣Check the resistance* of *See chapter (9)
⧣Joystick status indicator has an internal joystick status indicator
defect
⧣Connector pin is contacted to vehicle ground
C5 S.C. to battery voltage at joystick status No reaction ⧣Check the cable from TCU to
indicator OP mode : Normal joystick status indicator
TCU detected a wrong voltage at the output ⧣Check the connectors from
pin, that looks like a S.C. to battery voltage joystick status indicator to TCU
⧣Cable is defective and is contacted to ⧣Check the resistance* of *See chapter (9)
battery voltage joystick status indicator
⧣Joystick status indicator has an internal
defect
⧣Connector pin is contacted to battery voltage
C6 O.C. at joystick status indicator No reaction ⧣Check the cable from TCU to
TCU detected a wrong voltage at the output OP mode : Normal joystick status indicator
pin, that looks like a O.C. for this output pin ⧣Check the connectors from
⧣Cable is defective and has no connection joystick status indicator to TCU
to TCU ⧣Check the resistance* of *See chapter (9)
⧣Joystick status indicator has an internal joystick status indicator
defect
⧣Connector pin has no connection to TCU
3-54
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
D1 S.C. to battery voltage at power supply for See fault codes No.21 to 2C ⧣Check cables and connectors Fault codes No.21 to No.2C
sensors to sensors, which are supplied may be reaction of this fault
TCU measures more than 6V at the pin AU1 from AU1
(5V sensor supply) ⧣Check the power supply at the
pin AU1(Should be appx. 5V)
D2 S.C. to ground at power supply for See fault codes No.21 to 2C ⧣Check cables and connectors Fault codes No.21 to No.2C
sensors to sensors, which are supplied may be reaction of this fault
TCU measures less than 4V at the pin AU1 from AU1
(5V sensor supply) ⧣Check the power supply at the
pin AU1(Should be appx. 5V)
3-55
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
3-56
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
E3 S.C. to battery voltage at display output No reaction ⧣Check the cable from TCU to
TCU sends data to the display and OP mode : Normal the display
measures always a high voltage level on the ⧣Check the connectors at the
connector display
⧣Cable or connectors are defective and are ⧣Change display
contacted to battery voltage
⧣Display has an internal defect
E4 S.C. to ground at display output No reaction ⧣Check the cable from TCU to
TCU sends data to the display and OP mode : Normal the display
measures always a high voltage level on the ⧣Check the connectors at the
connector display
⧣Cable or connectors are defective and are ⧣Change display
contacted to battery voltage
⧣Display has an internal defect
E5 DISPID1 timeout TCU select parameter set with ⧣Check display controller
Timeout of CAN-massage DISPID1 from ID0 ⧣Check wire of CAN-Bus
display controller OP mode : Limp home ⧣Check cable display controller
⧣Interference on CAN-Bus
⧣CAN wire/connector is defective
⧣Can wire/connector is defective and has
contact to vehicle ground or battery voltage
3-57
Fault code Meaning of the fault code
(Hex) possible reason for fault detection Reaction of the TCU Possible steps to repair Remarks
F1 General EEPROM fault No reaction ⧣Replace TCU Often shown together with
TCU can't read non volatile memory OP mode : Normal fault code F2
⧣TCU is defective
F3 Application error Transmission stay neutral ⧣Replace TCU This fault occurs only if an test
Something of this application is wrong OP mode : TCU shutdown engineer did something wrong
in the application of the vehicle
F5 Clutch failure Transmission stay neutral ⧣Check clutch TCU shows also the affected
AEB was not able to adjust clutch filling OP mode : TCU shutdown clutch on the display
parameters
⧣One of the AEB-Values is out of limit
3-58
(9) Measuring of resistance at actuator/sensor and cable
① Actuator
2 G
76043PT19
② Cable
UBat
P(Power supply)
TCU
1 2 Actuator/
Sensor
C(Chassis)
Ground
76043PT20
3-59
7) ELECTRIC CONTROL UNIT
(1) Complete system
2
1
12
10
5 4
9
3
7
A
13
2
6
8
11
14
7607APT11
1 Control unit(EST-37A)
2 Kickdown switch
3 Clutch cut off switch
4 Full automatic switch
5 LCD
6 Gear selector(DW-3) with integrated kickdown switch
7 Supply-system connection
8 Transmission
9 Cable to inductive transmitter - speed central gear train
10 Cable to inductive transmitter - speed turbine
11 Cable to inductive transmitter - speed engine
12 Cable to speed sensor output and speedometer
13 Cable to plug connection on the electro - hydraulic control unit
14 Brake pressure sensor/load sensor
(2) Description of the basic functions
The powershift-reversing transmissions will be equipped with the electronic transmission control
unit(EST-37A), developed for them.
The system is processing the wishes of the driver according to the following criteria.
·Speed definition as a function of gear selector position, driving speed and load level.
3-60
·Protection against operating errors, as far as possible and practical.
·Protection against overspeeds(On the basis of engine and turbine speed).
·Reversing-automatic system(Driving speed-dependent).
·Pressure cut off(Disconnecting of the drive train for maximum power on the power take-off).
·Switch for manual or automatic operation.
·Reversing function button, respectively kickdown function.
(3) Gearshifts
The control unit(EST-37A) is shifts the required speeds fully-automatically under consideration of
the following criteria.
·Gear selector position
·Driving speed
·Load level
At the same time, the following speeds are picked up by the control unit(EST-37A).
·n Engine
·n Turbine
·n Central gear train
·n Output
- Neutral position
Neutral position is selected through the gear selector.
After the ignition is turned on, the electronics remains in the waiting state; By the position neutral
of the gear selector, respectively by pressing on the key neutral, the control unit(EST-37A)
becomes ready for operation.
Now, a speed can be engaged.
- Speed engagement
In principle, the speed, adapted to the driving speed(At standing, or rolling machine), will be
engaged. The engagement is realized in dependence on load and rotational speed.
- Upshifting under load
Upshifting under load will be then realized if the machine can still accelerate by it.
- Downshifting under load
Downshifting under load will be realized if more traction force is needed.
- Upshifting in coasting condition
In the coasting condition, the upshifting will be suppressed if the speed of the machine on a
slope shall not be further increased.
- Downshifting in coasting condition
Downshiftings in the coasting condition will be realized if the machine shall be retarded.
- Reversing
At speeds below the reversing limit, direct reversing can be carried out at any time in the speeds
1F 1R and 2F 2R(As a rule, this is the maximum driving speed of the 2nd speed).
3-61
Reversings in the speeds 3 and 4 are realized dependent on the driving speed.
- Above the programmed reversing limit, the machine is braked down by downshifts of the
electronic control unit(EST-37A) to the permitted driving speed, and only then, the reversing into
the correspondingly preselected speed will be carried out.
- Below the permitted driving speed, the reversing is carried out immediately.
(4) Specific kickdown function
By means of the kickdown-button, integrated in the gear selector, it is at any time possible to
select in the speeds 2F and 2R(i.e. position 2 of the gear selector, at automatic mode also in the
2nd speed of the automatic range) the 1st speed by a short touch. This kickdown state can be
cancelled by :
1. Pressing the kickdown-button again
2. Realization of a reversal operation
3. Change of the gear selector position by the following modification
Gear selector(DW-3) - (Rotation) of the driving position 1...4.
The kickdown function will be always terminated by shifting to neutral.
(5) Clutch cut off
Especially at wheel loaders, the clutch cut off can be activated through a switch signal. It is
interrupting the power flow in the transmission as long as this signal is active. Besides, this
function can be used for the transmission-neutral shifting at applied hand brake or as emergency-
stop(In this case, a restarting is only possible through the gear selector-neutral position).
3-62
5. VOLVO AXLE
 Machine serial No. ; ~#0293
1) Front axle
2
3
5
1
4
7607PT12
2) Rear axle
2
3
4
1
7607PT13
3-63
ZF AXLE
 Machine serial No. ; #0294~
1) Front axle
2
3
3
2
7607APT15
2) Rear axle
3
2
1
3
2
7607APT16
3-63-1
2) FRONT AXLE DIFFERENTIAL SECTION
8 10 9 6 12
11
12
6 10 9
Torque
7 proportioning
Limited slip
1
12
12
4
3
7607PT16
3-64
3) REAR AXLE DIFFERENTIAL SECTION
7 9 8 5 11
10
11
9
Torque
5 proportioning
Limited slip
6
1
11
11
3 4
7607PT17
3-65
4) DIFFERENTIAL
(1) Description
3
When the machine makes a turn, the
2 4
outside wheel must rotate faster than the
inside wheel. A differential is a device
which continuously transmits power to the
right and left wheels while allowing them
to turn a different speeds, during a turn.
The power from the drive shaft passes
through bevel pinion(1) and is transmitted
to the bevel gear(2). The bevel gear
changes the direction of the motive force
by 90 degree, and at the same time
reduces the speed. 1
It then transmits the motive force through
the differential(3) to the axle gear shaft(4). 770-3 [3-26(1)]
770-3 [3-26(2)]
770-3 [3-26(3)]
3-66
5) TORQUE PROPORTIONING DIFFERENTIAL
(1) Function
① Because of the nature of their work, 4-
wheel-drive loaders have to work in
places where the road surface is bad.
In such places, if the tires slip, the ability
to work as a loader is reduced, and also
the life of the tire is reduced.
The torque proportioning differential is
installed to overcome this problem.
In structure it resembles the differential of
an automobile, but the differential pinion
gear has an odd number of teeth.
Because of the difference in the
resistance from the road surface, the
position of meshing of the pinion gear
and side gear changes, and this changes
the traction of the left and right tires.
3-67
② When traveling on soft ground
(Resistance from road surface to left and
right tires is different)
If the road resistance to the left wheel is
Spider rotating
smaller, the left side gear tends to rotate direction
forward, and this rotation changes the
engaging points between the side gears
and pinion. As a result, the distances
involving the engaging points becomes FL
Small road FR Large road
a>b. The pinion now is balanced as FL resistance a b resistance
×a=FR×b, where FL>FR. The right Engaging Engaging
side gear is driven with a greater force point point
than the left side gear. The torque can
Left side gear Right side gear
be increased by up to about 30% for Pinion
either side gear.
The pinion therefore does not run idle
and driving power is transmitted to both
side gears until the difference between
road resistance to the right and left
(770-7)3-27
wheels reaches about 30%.
3-68
6) FINAL DRIVE SECTION(Front & rear)
6 7 8 9
10 11
5
19
18
12
13
17 16 15 14
7707PT16
(1) To gain a large drive force, the final drive uses a planetary gear system to reduce the speed and
send drive force to the tires.
(2) The power transmitted from the differential through axle shaft(12) to sun gear(1) is transmitted to
planetary gear(2). The planetary gear rotates around the inside of a fixed ring gear(7) and in this
way transmits rotation at a reduced speed to the planetary carrier.
This power is then sent to the wheels which are installed to the planetary carriers.
3-69
6. TIRE AND WHEEL
770-3 (3-30)
1) The tire acts to absorb the shock from the ground surface to the machine, and at the same time
they must rotate in contact with the ground to gain the power which drives the machine.
2) Various types of tires are available to suit the purpose. Therefore it is very important to select the
correct tires for the type of work and bucket capacity.
3-70
GROUP 2 OPERATIONAL CHECKS AND TROUBLESHOOTING
Chapter 2 : Troubleshooting
Group 3 : Tests and adjustments
3-71
※ Transmission oil must be at operating temperature for these checks.
4
2
3
F
N
R
Repeat procedure until
transmission temperature gauge
arrow points to bar above dial.
4
2
3
position. Check completed.
checks
NOTE : Gear selector lever
Engine OFF. NOT OK
position changes slightly as
Repair lock or replace
steering column is tilted.
switch.
FEEL : Lever must move freely
through all positions.
Engage neutral lock.
Apply slight effort to move lever
into forward(F) and reverse(R).
LOOK : Neutral lock must stay
engaged.
4
3 N
R
NOT OK
Go to transmission error
Turn full automatic switch ON.
code group at page 3-32~
LOOK : Automatic sign on
3-58.
display.
Repair or replace the
Automatic sign Move gear selector lever to display or harness.
forward or reverse position.
Increase engine rpm.
LOOK : Speed(2nd~4th) on
display must vary with machine
speed.
3-72
Item Description Service action
4
2
3
1600rpm. Check completed.
Engine running.
Drive unit with transmission in NOT OK
each forward and reverse speed. Go to transmission makes
excessive noise group 3.
LISTEN : Transmission must not
make excessive noise in any
range.
Engine rpm must not "lug down"
as unit is shifted between gears.
3-73
Item Description Service action
LOOK/FEEL : Transmission
must shift to former(2nd or 3rd or
4th) gear.
NOTE : If gear selector lever kick
down switch or RCV lever switch
is pressed twice, transmission will
shift down the immediately back
to former gear.
Forward, reverse and Park unit on level surface. OK
4th speed clutch pack 1
2
3
Check completed.
Apply service brakes.
4
drag check
NOT OK
※ Transmission must Move gear selector lever to
If unit moves, repair
be warmed up for neutral.
transmission.
this check.
Move gear selector lever to 1st.
Engine running.
Release parking brake and
service brakes.
Run engine at low idle.
LOOK : Unit must not move in
either direction.
NOTE : If unit moves forward,
either the forward pack or the 4th
speed pack is dragging.
Engine running.
4
4
2
3
brakes and release parking brake. Check completed.
Move gear selector lever to 3rd NOT OK
speed. If stall rpm are too low or
too high, problem may be
Move gear selector control lever
engine power or torque
to forward "F" position.
converter.
Increase engine speed to high
IF OK
idle.
Replace transmission
LOOK : Torque converter stall torque converter.
rpm must be within the following
range.
Stall rpm : 2110±70rpm
Move gear selector control lever
to neutral "N" position and run for
15 seconds.
3-74
2. TROUBLESHOOTING
1) TRANSMISSION
※ Diagnose malfunction charts are arranged from most probable and simplest to verify, to least
likely, more difficult to verify. Remember the following steps when troubleshooting a problem :
Step 1. Operational check out procedure(See group 3 in section 1.)
Step 2. Operational checks(In this group.)
Step 3. Troubleshooting
Step 4. Tests and/or adjustments(See group 3.)
Error code on display Something wrong in transmission. Go to transmission error code group at page
3-32~3-58.
3-75
Problem Cause Remedy
Broken ring or pinion gear. If drive shaft rotate with transmission in gear but
machine does not move, a differential failure is
indicated. Repair.
3-76
Problem Cause Remedy
Transmission pressure is Low oil level. Check transmission oil level and refill if
low(All gears) necessary.
Failed transmission pressure Verify transmission system pressure. Do
switch. transmission system pressure test.
Plugged suction strainer. Transmission pump may be noisy if transmission
suction screen is clogged. Drain transmission.
Remove and clean suction screen.
Also, check condition of transmission filter.
Stuck transmission pressure Remove transmission pressure regulating valve.
regulating valve or broken spring. Inspect for damage(See transmission control
valve).
Failed control valve gasket. Inspect transmission control valve for external
leakage. Remove control valve.
Inspect or replace gasket.
Stuck PPC valve. Remove end cover to inspect modulation spool
and check torque on cap screws retaining
control valve to transmission.
3-77
Problem Cause Remedy
Transmission shifts too Wrong transmission controller. Check if transmission controller has been
fast changed
System pressure too high. Do transmission system pressure test.
Stuck PPC valve. Remove and inspect PPC valve.
Replace if necessary. Also remove end cover to
inspect PPC valve and control valve housing.
Replace if necessary.
Stuck or missing check valves. Inspect transmission control valve.
Missing O-ring from end of Remove orifice and inspect port for O-ring.
modulation orifice.
Broken piston return spring. Disassemble and inspect clutch.
Incorrect transmission oil. Change oil(SAE 10W-30/15W-40)
Transmission hydraulic High oil level. Transmission overfilled or hydraulic pump seal
system overheats leaking.
Low oil level. Add oil.
Wrong oil grade. Change oil.
Park brake dragging. Check for heat in park brake area.
Pinched, restricted or leaking lube Check cooler lines.
lines.
Machine operated in too high gear Operate machine in correct gear range.
range.
Malfunction in temperature gauge Install temperature sensor the verify temperature.
or sensor. Do tachometer/temperature reader installation
procedure.
Restricted air flow through oil Do radiator air flow test.
cooler or radiator.
Failed oil cooler bypass valve(In Disassemble and inspect.
thermal bypass valve).
Failed thermal bypass valve. Remove thermal bypass valve and check to see
if machine still overheats. Do transmission oil
cooler thermal bypass valve test.
Internally restricted oil cooler. Do oil cooler restriction test.
Leakage in transmission hydraulic Do transmission system pressure, element
system. leakage test.
Malfunction in converter relief Do converter out pressure test.
valve.
Low transmission pump output. Do transmission pump flow test.
3-78
Problem Cause Remedy
Excessive transmission Too low engine low idle. Check engine low idle speed.
noise(Under load or no
Worn parts or damaged in Remove transmission suction screen. Inspect
load)
transmission. for metal particles.
Repair as necessary.
Warped drive line between engine Inspect drive line.
and torque converter.
Low or no lube. Do converter-out and lube pressure test. Do
transmission pump flow test.
Oil ejected from dipstick Plugged breather. Inspect breather on top of transmission.
Replace.
Machine lacks power Engine high idle speed set too Check high idle adjustment.
and acceleration low.
Incorrect transmission oil. Change oil.
Aerated oil. Add oil.
Low transmission pressure. Do transmission system pressure test.
Warped transmission clutch. Do transmission clutch drag checks.
Torn transmission control valve Inspect gasket.
gasket.
Brake drag. Do brake drag check.
Failed torque converter. Do torque converter stall speed test.
Low engine power. Do engine power test.
Torque converter stall Aerated oil. Put clear hose on thermal bypass outlet port.
RPM too high Run machine to check for bubbles in oil.
Stuck open converter relief valve. Do converter-out pressure test.
Leakage in torque converter seal. Do converter-out pressure test.
Torque converter not Replace torque converter.
transferring power(Bent fins,
broken starter).
3-79
Problem Cause Remedy
3-80
2) DIFFERENTIAL / AXLE
Differential low on oil External leakage. Inspect axle and differential for leaks.
Excessive differential Low oil level in differential. Check oil. Remove drain plug and inspect for
and/or axle noise metal particles in differential case.
Disassemble and determine cause.
Incorrect type of oil. Change oil
Dragging brakes. Do brake check.
Failed pinion bearing. Remove and inspect pinion.
Check to ensure pinion housing was indexed.
Incorrect gear mesh pattern Remove pinion gear housing and inspect ring
between ring and pinion gear. and pinion gear.
Failed differential pinion gears Remove differential housing drain plug and
and/or cross shafts. inspect for metal particles. Disassemble and
inspect.
Failed axle bearing. Do axle bearing adjustment check.
Mechanical failure in axle Remove differential. Inspect, repair.
planetary.
Oil seeping from outer Excessive end play in axle. Do axle bearing adjustment check.
axle seal
Worn outer bearing and/or cup. Disassemble and inspect outer axle bearing,
cup, spacer, and seal. Replace, if necessary.
Overfilled differential. Check differential oil return system for excessive
internal restriction.
3) DRIVE LINE
Excessive drive line Yokes not in line on drive shafts. Inspect. Align drive shaft yokes.
vibration or noise
Worn front drive line support Inspect, repair.
bearing.
Bent drive shaft. Inspect all drive shafts. Replace.
Loose yoke retaining nuts(Drive Inspect. Replace.
shafts wobble at high speed).
Rear axle oscillating support. Inspect, repair.
Lack of lubrication. Lubricate with proper grade of grease.
3-81
GROUP 3 TESTS AND ADJUSTMENTS
BL1
Brake valve
7707PT12
3-82
2. TRANSMISSION MEASURING POINTS AND CONNECTIONS
The measurements have to be carried out at hot transmission(About 80~95。C).
48 47 21
16
15
52,63
34
65 51 68
69 49
H J
K G
57 A F
60
B E
53 55
C D
58 56
VIEW X
7607PT14
3 - 83
2) DELIVERY RATES
4) CONNECTIONS
3-84
GROUP 4 DISASSEMBLY AND ASSEMBLY
1. CONTROL VALVE
1) DISASSEMBLY
(1) Illustration on the right shows the comple-
te control unit.
73073CV001
73073CV002
73073CV003
73073CV004
3-85
(5) Loosen socket head screws.
Separate cover from housing and cable
harness.
Box spanner 5873 042 002
73073CV005
73073CV006
73073CV007
73073CV008
3-86
(9) Separate housing from valve housing by
loosening the adjusting screws uniformly.
Adjusting screws 5870 204 036
73073CV009
73073CV010
73073CV011
3-87
2) ASSEMBLY
ö Check all components for damage and
renew if necessary.
Prior to the installation, check free travel of
all moving parts in the housing.
Spools can be exchanged individually.
Oil the components prior to the assembly.
Insert diaphragms with the concave side
showing upward until contact is obtained.
ö Installation position, see arrows.
73073CV015
73073CV016
73073CV017
3-88
73073CV019
73073CV020
73073CV022
3-89
(7) Install components according to figure (6).
Preload compression springs of the follow-
on slides and locate spool provisionally by
means of cylindrical pins ͚ 5.0mm
(Assembly aid), see arrows.
Install two adjusting screws.
Assemble gasket(Arrow 1) and housing
cover, and position them uniformly against
shoulder, using adjusting screws.
ö Pay attention to the different housing 73073CV023
covers-install the recess ͚19mm(Arrow 2),
facing the main pressure valve.
Now, fasten housing cover by means of
socket head screws.
ÂTorque limit : 0.56kgfÂm(4.06lbfÂft)
Remove cylindrical pins(Assembly aid)
again.
Adjusting screws 5870 204 036
Box spanner 5873 042 002
73073CV025
3-90
(10) Introduce female connector against
shoulder, with the groove facing the guide
nose of the cover.
Install gasket(Arrow) and fasten cover by
means of socket head screws.
ÂTorque limit : 0.56kgfÂm(4.06lbfÂft)
Box spanner 5873 042 002
73073CV026
73073CV027
73073CV028
73073CV029
3-91
(14) Mount intermediate plate, with the screens
showing upward.
73073CV030
73073CV031
73073CV032
73073CV033
3-92
2. POWERSHIFT TRANSMISSION
Fasten transmission of the assembly car.
Assembly car 5870 350 000
Strips 5870 350 063
Support 5870 350 090
75773TM050
1) DISASSEMBLY
(1) Separate hydraulic control unit and duct
plate from gearbox housing
Η Loosen two socket head screws and
install adjusting screws.
Now, loosen remaining socket head
screws and separate valve housing from
duct plate.
Adjusting screws(M6) 5870 204 063
Box spanner 5873 042 002 75773TM051
75773TM052
75773TM053
3-93
(2) Converter
Η Loosen hexagon head screws and
separate diaphragm from the converter.
75773TM060
75773TM061
75773TM062
75773TM063
3-94
(3) Hydraulic pump
Η Loosen socket head screws.
75773TM064
75773TM065
75773TM067
3-95
(4) Converter back pressure valve
Η Preload compression spring and remove
lock plate.
Remove released components.
75773TM068
75773TM069
75773TM076
3-96
Ι Loosen hexagon nuts and remove both
covers(Arrows).
Loosen screw connection(Housing/
Housing cover).
75773TM077
75773TM078
device.
Handle(6 pieces needed) 5870 260 010
Eye bolt(M20, 2EA) 0636 804 003
Eye bolt(M16, 1EA) 0636 804 001
Puller device 5870 000 017
Lifting chain 5870 281 047
3-97
Μ Separate housing cover along with
clutches from the gearbox housing, using
lifting device.
75773TM081
75773TM082
75773TM083
75773TM084
3-98
Π Tilt housing cover 180Á.
Illustration on the right shows the
arrangement of the single clutches and
the input in the housing cover.
AN Input
KV Clutch-Forward
KR Clutch-Reverse
K1 Clutch-1st speed
K2 Clutch-2nd speed
K3 Clutch-3rd speed
75773TM085
K4 Clutch-4th speed
75773TM086
75773TM087
75773TM088
3-99
⯾ Remove clutch K3.
75773TM089
75773TM090
75773TM092
3-100
⬾ Squeeze rectangular ring out(Arrow) and
press ball bearing from the shaft.
75773TM093
75773TM095
75773TM096
75773TM097
3-101
Κ Separate plate carrier from the shaft.
Three leg puller 5870 971 003
75773TM098
75773TM099
75773TM100
75773TM101
3-102
Ξ Remove both O-rings(Arrows).
75773TM102
75773TM103
75773TM104
75773TM105
3-103
(7) Disassemble clutch K1, K2 and K3
ö The following figures show the disassem-
bly of clutch K3.
The disassembly of the clutches K1 and
K2 is similar.
75773TM110
75773TM111
75773TM112
3-104
Κ Remove both needle bearings as well as
the axial bearing(Complete).
75773TM113
75773TM114
75773TM115
75773TM116
3-105
(8) Disassemble clutch K4
Η Squeeze rectangular ring out(Arrow).
75773TM120
75773TM121
75773TM122
75773TM123
3-106
Λ Preload cup-spring pack and squeeze
snap ring out.
Remove released components.
Remove piston.
Assembly aid 5870 345 008
75773TM124
75773TM125
75773TM126
3-107
(9) Disassemble drive shaft
Η Squeeze rectangular ring out.
Pull off tapered roller bearing.
Remove opposite tapered roller bearing
accordingly.
Grab sleeve 5873 002 045
Basic set 5873 002 001
Basic set 5873 002 006
75773TM130
75773TM131
3-108
2) REASSEMBLY
(1) Install oil tubes
ö To ensure the correct installation of the oil
tubes, the use of the indicated special tool
is imperative.
75773TM140
75773TM142
3-109
Κ Assemble both oil tubes(Arrows) until
contact is obtained.
Equip screw plug with new O-ring and
install it.
ÂTorque limit : 14.3kgfÂm(103lbfÂft)
75773TM143
75773TM144
Μ Mount studs(M8Ý25).
ÂTorque limit : 0.92kgfÂm(6.64lbfÂft)
Wet screw in thread with loctite(Type No.
262).
Equip plugs(Arrows) with new O-rings
and install them
ÂTorque limit(M16Ý1.5) : 4.1kgfÂm
(29.5lbfÂft)
ÂTorque limit(M18Ý1.5) : 5.1kgfÂm
(36.9lbfÂft) 75773TM145
75773TM146
3-110
(2) Reassemble clutch KV and KR
ö The following figure show the reassembly
of the clutch KV. The reassembly of the
clutch KR has to be carried out
accordingly.
Preassemble plate carrier
Η Check function of the purge valve.
ö Ball must not stick, if necessary, clean
with compressed air.
75773TM150
75773TM151
75773TM152
75773TM153
3-111
Plate pack KV, KR
ö The plate arrangement respectively
stacking of clutch KV and KR is identical.
Λ The following draft shows the installation
+0.2
position of the components. 2.7 mm
5
1 Plate carrier 3
2 Piston
6
3 Outer plate-one sided coated(1 piece) 2
4 Inner plates(10 pieces)
5 Outer plates-coated on both sides 7
(10 pieces) 1
6 Snap ring(Optional s= 2.1~4.2mm) 4
7 End shim
Effective number of friction surfaces = 20
ö Install outer plate 3 with the uncoated
side facing the piston.
Install on the end-shim side two outer 76043PT07
and inner plates each.
75773TM155
75773TM156
3-112
Ξ Press on end shim with about 100N
(10kg), apply dial indicator and set it at
zero.
75773TM157
75773TM159
3-113
Ρ Mount stud(Arrow).
Wet screw-in thread with loctite(Type
No.241).
ÂTorque limit(M10) : 1.7kgfÂm(12.5lbfÂft)
75773TM160
75773TM161
75773TM162
75773TM163
3-114
⯿ Heat inner diameter of plate carrier
(About 120♻ C).
Hot air blower 220V 5870 221 500
Hot air blower 110V 5870 221 501
75773TM164
75773TM165
75773TM166
75773TM167
3-115
⬿ Press tapered roller bearing against
shoulder.
Install opposite tapered roller bearing
accordingly.
75773TM168
75773TM169
75773TM176
3-116
Ι Assemble plate carrier until contact is
obtained.
Hot air blower 220V 5870 221 500
Hot air blower 110V 5870 221 501
75773TM177
75773TM178
75773TM179
75773TM180
3-117
Ν Preload cup spring pack and fix it by
means of snap ring.
Assembly aid 5870 345 088
75773TM181
Plate pack K1
1 Plate carrier
+0.2
2 Piston 2.4 mm
3 Outer plate-one side coated(1 piece)
5
4 Inner plates(9 pieces) 3
5 Outer plates-on both sides coated
2 6
(9 pieces)
6 Snap ring(Optional s=2.1~4.2mm)
7 End shim 7
Effective number of friction surfaces = 18 1 4
3-118
Adjust plate clearance
Plate clearance clutch K1 2.4+0.2mm
Plate clearance clutch K2 and K3
1.8+0.2mm
ö For the adjustment of the plate clearance
are snap rings with different thickness
available.
To ensure a faultless measuring result,
install the plates for the moment without
oil. 75773TM185
75773TM186
75773TM187
3-119
Π Now, push the end shim by means of
screw driver against snap ring until
contacts is obtained(Upward) and read
plate clearance on the dial indicator.
ö In case of a deviation from the required
plate clearance, correct with correspond-
ing snap ring(s=2.1~4.2mm).
After the adjustment of the plate
clearance has been carried out, remove
the plate pack, oil plates and install it 75773TM188
again.
Use oil SAE 10W-30/15W-40.
Magnetic stand 5870 200 055
Dial indicator 5870 200 057
75773TM189
75773TM190
3-120
⯽ Introduce idler gear until all inner plates
are accommodated.
75773TM191
75773TM192
75773TM193
75773TM194
3-121
⬽ Squeeze rectangular ring in(Arrow) and
let it snap in.
Install opposite rectangular ring
accordingly.
75773TM195
75773TM200
75773TM201
⯳ Install stud(Arrow).
⚰ Wet screw-in thread with loctite(Type No.
241).
♼Torque limit(M10) : 1.7kgf♼m(12.5lbf♼ft)
75773TM202
3-122
Κ Check function of the purge valve.
ö Ball must not stick, if necessary clean
with compressed air.
Insert both O-ring(Arrow) scrollfree into
the grooves of the piston and oil them.
75773TM203
75773TM204
75773TM205
75773TM206
3-123
Plate pack K4
ö The following draft shows the installation
position of the components. +0.2
mm
1.2
1 Plate carrier
2 Piston 5
3
3 Outer plate-one side coated(1 piece)
4 Inner plates(5 pieces) 6 2
5 Outer plates-coated on both sides
(5 pieces) 7
6 Snap ring(Optional s= 2.1~4.2mm) 4 1
7 End shim
Effective number of friction surfaces = 10
ö Install outer plate 3 with the uncoated
76043PT14
side facing the piston.
75773TM210
75773TM211
3-124
Π Press on the end shim with about 100N
(10kg), apply dial indicator and set it at
zero.
75773TM212
75773TM214
3-125
⯽ Assemble both axial washers as well as
needle case.
⚰ Upper and lower axial washer have the
same thickness(55⚗78⚗1).
75773TM215
75773TM216
75773TM217
75773TM218
3-126
⬽ Heat inner diameter of the plate carrier
(About 120♻ )).
Assemble preassembled plate carrier
until all inner plates are accommodated.
⚰ Use safety gloves.
75773TM219
75773TM220
75773TM221
75773TM222
3-127
͇ Squeeze rectangular ring in(Arrow) and
let it snap in.
Install opposite rectangular ring.
75773TM223
75773TM225
75773TM226
75773TM227
3-128
Κ Introduce turbine shaft until the snap ring
snaps into the groove of the drive shaft
turbine shaft is axially fixed.
75773TM228
75773TM229
75773TM230
75773TM231
3-129
Ι Insert all bearing outer races into the
bearing bores of the housing.
Install O-ring(Arrows).
ö At the use of already run bearings, pay
attention to the allocation of the bearing
outer races, see also note/page 3-100.
AN Input
KV Clutch-Forward
KR Clutch-Reverse
K1 Clutch-1st speed
K2 Clutch-2nd speed 75773TM232
K3 Clutch-3rd speed
K4 Clutch-4th speed
AB Output
75773TM233
75773TM234
3-130
(7) Install preassembled drive shaft and
clutches
Η Insert all bearing outer races into the
bearing bores of the housing cover.
ö At the use of already run bearings, pay
attention to the allocation of the bearing
outer races, see also note/page 3-100.
AN Input
KV Clutch-Forward
KR Clutch-Reverse
K1 Clutch-1st speed
K2 Clutch-2nd speed
K3 Clutch-3rd speed
K4 Clutch-4th speed
AB Output 75773TM235
75773TM236
75773TM237
3-131
Κ Install clutch K3.
75773TM238
75773TM239
75773TM240
75773TM241
3-132
Ξ Fix all clutches by means of handles.
Handle(6 pieces needed) 5870 260 010
75773TM242
75773TM243
75773TM245
3-133
Install both cylindrical pins centrally to the
housing face.
75773TM246
75773TM247
75773TM248
75773TM249
3-134
Ι Fix pump shaft by means of circlip.
75773TM250
75773TM251
75773TM252
3-135
Θ Assemble output flange.
Insert O-ring(Arrow) into the gap of drive
flange and shaft.
75773TM256
75773TM257
75773TM258
3-136
Θ Introduce components according to
figure (10) Η, preload and fix by means
of lock plate.
Equip plug(Arrow) with new O-ring and
install it.
ÂTorque limit(M14Ý1.5) : 2.5kgfÂm
(18.4bfÂft)
75773TM261
75773TM262
75773TM263
75773TM264
3-137
Κ Insert O-ring(Arrow) into the annular
groove and oil it.
75773TM265
75773TM266
75773TM267
75773TM268
3-138
Ξ Fasten oil feed housing by means of
socket head screws and hexagon head
screws(2 pieces).
ÂTorque limit
- Socket head screw : 2.3kgfÂm
(16.6bfÂft)
- Hexagon head screw : 4.7kgfÂm
(33.9bfÂft)
ö Pay attention to the position of the fixing
plate, see Arrow. 75773TM269
Box spanner(Torx, TX-40) 5873 042 004
75773TM270
75773TM271
75773TM272
3-139
Κ Introduce converter until contact is
obtained.
ö Pulse disk of the converter must be
positioned centrally to the bore of the
inductive transmitter, see Arrow.
Only in this way will be ensured that the
converter is perfectly introduced.
75773TM273
75773TM274
75773TM275
75773TM276
3-140
Ν Fix hexagon head screws by means of
lock plate.
Driver 5870 057 010
Handle 5870 260 002
75773TM277
75773TM278
75773TM279
75773TM280
3-141
(14) Mount duct plate and hydraulic control
unit
Η Install components according to the
following draft.
ÂTorque limit(M8) : 2.3kgfÂm(17.0lbfÂft)
ö Pay attention to the installation position of
the different gaskets, see draft. 5
3 4
1 Gasket 2
2 Duct plate 1
3 Gasket
4 Intermediate plate
5 Gasket
Adjusting screws 5870 204 063
Box spanne 5873 042 004
76043PT21
75773TM282
75773TM283
3-142
(15) Install plugs and oil level tube
Η Equip both plugs(Arrows) with new O-
rings and install them.
ÂTorque limit(M18Ý1.5) : 5.1kgfÂm
(36.9lbfÂft)
ÂTorque limit(M26Ý1.5) : 8.2kgfÂm
(59.0lbfÂft)
75773TM284
75773TM285
75773TM286
3-143
(16) Speed sensor and inductive transmitters
Η The figures show the installation position
of the single inductive transmitters and
the speed sensor.
34 Speed sensor
n-Output and speedometer
21 Inductive transmitter
n-Turbine
47 Inductive transmitter
n-Central gear train 75773TM290
48 Inductive transmitter
n-Engine
75773TM291
Ι Install breather(Arrow).
ÂTorque limit : 1.2kgfÂm(8.9lbfÂft)
75773TM292
3-144
3. VOLVO AXLE (Machine serial No. ; ~#0293)
1) GENERAL INSTRUCTIONS
(1) SHIMS
All adjustments shall be carried out after all adjustment shims have been selected measuring
them one by one with a micrometer gauge and, then, summing up all values measured; don’t trust
incorrect measurement of pack as a unit or sum of nominal value printed on each shim.
(2) SEALS FOR REVOLVING SHAFTS
Proceed as follows for proper fitting of captioned seals:
Η Prior assembly, seals should be kept, for at least half an hour, in a bath with the same oil to be
sealed;
Θ Clean thoroughly shaft and make that working surface be not damaged;
Ι Position sealing lip against the fluid to be sealed; in case of hydrodynamic lip lines should be
oriented so as that, considering direction of revolving shaft, they lead fluid inside of sealing
means;
Κ Smear sealing lip with a film of lubricant(oil is better than grease) and fill up with grease the space
between sealing lip and dust shield lip, if using double sealing lip type seals;
Λ Press seal in relevant seat or use a proper fitter with flat contact surface; never use hammer or
mallet to mount seal;
Μ When press fitting seal make sure that it be correctly driven in relevant seat, i.e., perpendicular
with respect to its seat, as fitting is completed make sure, if required, that seal itself be in contact
with relevant shoulder;
Ν To prevent damage of seal lip when inserting shaft, duly protect component during assembly.
(3) O-RING SEALS
Lubricate O-RING seals at assembly to prevent twisting that would impair correct sealing.
Clean matching surface as follows prior, smearing compound:
Η Remove old deposits using a metal brush;
Θ Degrease surfaces by one the following cleaners: trichloroethylene, kerosene or a warm water
and soda solution.
(4) BEARINGS
When assembling them it is advisable to proceed as follows:
Η Heat them with 80 to 90ÁC before fitting on relevant shafts;
Θ Cool them before inserting in relevant external seats.
(5) SPRING PINS
When using split pins be sure that lengthwise cleft be positioned toward stress on pin.
Coil pins don’t require specific position.
3-145
2) REDUCTION ASSEMBLY
(1) DISASSEMBLY
Η Turn the plug toward top position and
remove the plug for the air vent.
Assemble the plug temporarily.
AX001
AX002
AX003
AX004
3-146
Λ Pull out wheel shaft with sun gear, discs
carrier hub and thrust plate.
AX005
AX006
AX007
Ξ Remove locks.
AX008
3-147
Ο Install the proper tool on pressure plate and
apply the eye bolt(3EA) temporarily.
Tighten the eye bolt tool perfectly.
AX009
AX0010
AX0011
AX0012
3-148
⯽ Pry off lock ring from ring gear by a screw
driver and remove ring gear support.
AX0013
AX0014
AX0015
AX0016
3-149
AX0017
AX0018
AX0019
AX0020
3-150
⭀ Remove the planetary gear and thrust
washer step by step.
AX0021
(2) ASSEMBLY
⯱ Insert the inner bearing cone.
AX085
AX086
AX087
3-151
Κ Replace O-ring seals on piston.
ö Cover the oil on O-ring seal enough.
AX088
AX089
AX090
AX091
3-152
Ξ Insert into relevant holes the six pins that, for
proper operation of whole system, have to
be of the same length and however in
accordance with relevant drawing.
AX092
AX093
AX094
AX095
3-153
Remove spring compression tool.
AX096
AX097
AX098
AX099
3-154
⯿ Install brake measuring tool on wheel hub.
⚰ Distance of brake measuring tool J
J
7607PT18
7607PT19
7607PT20
3-155
⬾ To determine thickness of disc pack from
previsously computed value M. M
disc-brake 4EA
AX104
AX105
3-156
⭂ Arrange all the three side gears into relevant
seats of side gear carrier, position inner
thrust washers and align holes.
AX106
AX107
AX108
AX109
3-157
͌ Fit O-ring seal on outer side.
Mount side cover on final drive.
ÂTightening torque
Front and rear axle : 2.9~3.6kgfÂm
(21.0~26.0lbfÂft)
AX110
AX111
AX112
Front
AX022
3-158
Θ Release nut and screw.
Front
AX023
Front
AX024
Front
AX025
Front
AX026
3-159
Μ Remove the fixed bolts of caliper bracket.
Front
AX027
(2) ASSEMBLY
Η Install caliper bracket.
ÂTightening torque
14.2~15.7kgfÂm(103~114lbfÂft)
Front
AX113
Front
AX114
Front
AX115
3-160
Κ Release nuts on fixed bolts in order to obtain
the maximum opening of gripper.
Front
AX116
Front
AX117
Front
AX118
FRONT
7607PT22
3-161
Ξ Press 110~120bar in brake port and close
adhesion pad on disc by means of
tightening screw pin.
Front
AX120
Front
AX121
Π Tighten nut.
ÂTightening torque : 14~16kgfÂm
(101~116lbfÂft)
Front
AX122
Front
AX123
3-162
4) DIFFERENTIAL ASSEMBLY
(1) REMOVAL
Η Remove screws and take away air
recirculation duct from differential support
and axle case.(Front axle only)
Front
AX0228
AX029
AX030
(2) DISASSEMBLY
Η Place differential unit upside down; mark
caps position.
AX031
3-163
Θ Unlock and remove caps fixing screws.
AX032
AX033
7607AX130
7607AX131
3-164
Μ Install the disassembling bolt on tap (M12Ý
1.75, 2EA) of cross beram assembly.
(Rear differential only)
7607AX132
AX034
AX133
AX134
3-165
Π Place on proper support and lock the
differential. Straighten notches on pinion
nut, then position reaction tool on P.T.O.
flange and unlock nut; release pinion nut.
Remove drive flange from pinion shank.
AX035
AX036
AX037
AX038
3-166
⯽ Remove the bearing cone.
AX039
AX135
AX041
AX137
3-167
(3) ASSEMBLY
Η Measure the dimensions for assembly
position of pinion bevel.
B
A
Decide the dimension X(shim thickness) by
the calculation.
X
AX043
AX138
AX139
AX140
3-168
AX141
AX142
AX143
AX047
3-169
Μ Determine shim X thickness for correct axial
position of pinion-bevel.
X = A - (B + C)
ö Round up or down to the nearest tenth of
millimeter the computed thickness.
2.12 rounded down to = 2.1mm
2.18 rounded up to =2.2mm
AX144
AX145
AX146
AX049
3-170
Ο Fit in inner race bearing by pressing.
AX147
AX148
AX149
AX150
3-171
Turn the carrier upside down and assemble
the bevel pinion assembly.
ö In order to contact between the bearing
cone in pinion bevel and the cup bearing of
carrier perfectly, support the bevel pinion by
preferable tool.
AX052
AX055
AX056
3-172
⬼ As bearing pre-load has been determined,
remove drive flange and pinion nut holder.
AX058
⬽ Assemble seal.
⚰ Cover the seal with retaining compound.
Cover the seal lip and the flange with oil.
AX059
AX060
AX151
3-173
⭀ Tighten the fixing bolt of cross beam
assembly.
(Rear differential only)
♼Tightening torque : 31.3~34.6kgf♼m
(226~250lbf♼ft)
AX152
AX061
AX062
3-174
⭄ Brush red lead on some ring tooth, rotate to
mesh pinion and ring gear repeatedly, so to
make evident tooth contact. Proper and
correct tooth contact marks are visible on a
new bevel gear set as a result of an
optimum contact approached on the tester,
consequently, a proper axial position of
pinion against ring gear will emphasise
remarking of previous tester contact
markings. AX064
AX065
AX153
AX065
3-175
Θ Assemble O-ring on tube assembly port(3EA).
(Front axle only)
AX083
AX084
AX154
AX155
3-176
Ι Remove the side gear and the trust washer.
AX156
AX157
AX158
AX159
3-177
(2) ASSEMBLY
Η Install gear-bevel on case(LH) by bolts.
ö Tightening torque
ÂFront axle : 45.6~50.4kgfÂm(330~365lbfÂft)
ÂRear axle : 31.3~34.6kgfÂm(226~250lbfÂft)
AX160
AX079
AX162
3-178
6) TOOLS
Η Spring compression tool.
AX124
AX125
3-179
4. ZF AXLE (Machine serial No. ; #0294~)
 FRONT AXLE
1
7577AAXF002
7577AAXF003
7577AAXF004
3-180
(4) Pull slotted pin by means of the striker out
of the bore in the slotted nut.
ö Special tool
Striker 5870 650 001
7577AAXF005
7577AAXF006
7577AAXF007
7577AAXF008
3-181
(8) Pull stub shaft out of the sun gear shaft.
ö Pay attention to possibly released shim(s).
7577AAXF009
7577AAXF010
7577AAXF011
7577AAXF012
3-182
(12) Squeeze out the retaining ring.
ö Special tool
Set of external pliers 5870 900 015
7577AAXF013
7577AAXF014
7577AAXF015
ö Special tool
Two-armed puller 5870 970 007
7577AAXF016
3-183
(16) Remove O-rings (see arrows) from the
annular grooves of the ring gear.
7577AAXF017
7577AAXF018
7577AAXF019
7577AAXF020
3-184
(20) Squeeze out the circlip.
ö Special tool
Set of external pliers 5870 900 016
7577AAXF021
7577AAXF022
7577AAXF023
7577AAXF024
3-185
(24) Preload cup springs by means of a press
and squeeze out the circlip.
ö Special tool
Assembly pliers 5870 900 051
Assembly fixture 5870 345 096
7577AAXF025
7577AAXF026
7577AAXF027
7577AAXF028
3-186
(28) Remove guide ring, support rings and U-
rings from the annular grooves of the
brake housing.
ö See below sketch for installation position
of the single parts.
7577AAXF029
To the sketch :
1 Brake housing
1
2 Guide ring
3 Support ring
4 U-ring
5 U-ring
2
6 Support ring 3
7 Output shaft 4
5
6
7577AAXF030
7577AAXF031
3-187
(30) Lift brake housing with lifting tackle from
the output shaft.
ö Special tool
Lifting chain 5870 281 047
Eye bolts 5870 204 071
7577AAXF032
7577AAXF033
7577AAXF034
7577AAXF035
3-188
(34) Press off bearing sheet from the output
shaft.
ö Special tool
Pry bar set 5870 345 065
7577AAXF036
3-189
2) R EASSEMBLY OF OUTPUT AND
BRAKE
(1) Insert wheel bolt into the output shaft until
contact.
ö Special tool
Wheel bolt puller-basic set 5870 610 010
Insert (7/8"-14 UNF) 5870 610 011
7577AAXF037
7577AAXF038
7577AAXF039
7577AAXF040
3-190
(5) Press both bearing outer rings into the
brake housing until contact.
7577AAXF041
To the sketch :
1 Brake housing * *
* 1
2 Shaft seal
* Grease filling 2
ö Fill the space between sealing and dust
lips with grease.
7577AAXF043
7577AAXF044
3-191
(8) Heat the roller bearing and install it until
contact.
7577AAXF045
7577AAXF046
To the sketch :
1 Brake housing
1
2 Guide ring
3 Support ring
4 U-ring
5 U-ring
2
6 Support ring 3
7 Output shaft 4
5
6
7577AAXF047
3-192
(10) Clean annular groove of the brake housing
with spirit.
Then insert the guide ring into the annular
groove (also see sketch page 3-192) and
fix it with Loctite (Type No. 415) at its
extremities.
ö Guide ring must have contact on the
whole circumference.
Upon installation the orifice of the guide 7577AAXF048
7577AAXF049
7577AAXF050
3-193
(14) Install cup springs (7 pieces each/pin ).
ö Pay attention to the installation position of
the cup springs, see below sketch.
7577AAXF052
To the sketch : 5 4
1 Pin
2 Gripping rings
3
3 Cup springs
X
4 Support shim
5 Circlip 2
X Installation dimension gripping rings
10.5 + 0,3 mm 1
7577AAXF053
7577AAXF054
7577AAXF055
3-194
(17) Fix support shim by means of the circlip.
7577AAXF056
7577AAXF057
To the sketch :
1 2 34 5
"X"
1 Brake housing
2 Circlip
3 Slotted pin
4 Support shim
5 Piston
X Installation dimension 4.0 -0,5 mm
7577AAXF058
7577AAXF059
3-195
(20) Insert planet carrier into the spline of the
output shaft until contact.
7577AAXF060
7577AAXF061
7577AAXF062
7577AAXF017
3-196
(24) Install two adjusting screws and insert ring
gear into the brake housing until contact.
ö Special tool
Adjusting screws 5870 204 029
ö Pay attention to radial location.
7577AAXF063
7577AAXF064
7577AAXF065
7577AAXF066
3-197
(28) Fasten plant gears by means of retaining
rings.
ö Special tool
Set of external pliers 5870 900 015
7577AAXF067
7577AAXF069
7577AAXF070
3-198
(32) Determine Dimension II from the face of
the sun gear shaft up to the mounting face
of the axle casing.
Dimension II e.g . . . . . . . . . . . . 43.00mm
ö Special tool
Digital depth gauge 5870 200 072
Gauge blocks 5870 200 066
Straightedge 5870 200 022
7577AAXF071
EXAMPLE A :
Dimension I . . . . . . . . . . . . . . . 46.20mm
Dimension II . . . . . . . . . . . . . - 43.00mm
Difference . . . . . . . . . . . . . . . . 3.20mm
required end play e.g. . . . . . . - 1.00mm
Difference = shim e.g. s = 2.20mm
7577AAXF072
7577AAXF073
3-199
(35) Fix O-ring(see arrow) into the recess of
the axle casing by means of grease and
install the preassembled output to the axle
casing until contact by means of lifting
tackle.
ö Special tool
Lifting bracket 5870 281 043
7577AAXF074
7577AAXF075
7577AAXF076
7577AAXF077
3-200
(39) Assemble O-ring (see arrow) to the cover.
7577AAXF078
7577AAXF079
3-201
High-pressure test :
Increase test pressure up to p = 100-10 bar and close connection to HP-pump by means of shut-
off valve.
During a 5 min. testing time a pressure drop of max. 2% (2 bar) is allowed.
If the maximum pressure of 100 bar is exceeded, there will be an excessive piston adjust-
ment and a repeated disassembly of the brake or the adjusting is required to reset the
gripping rings to the adjusting dimension.
Low-pressure test :
Reduce test pressure to p = 5 bar and close the shut-off valve again.
During a 5 min. testing time a pressure drop is not allowed.
ö Special tool
HP-Pump 5870 287 007
Mini-measuring hub 5870 950 115
(9/16"- 18UNF)
ö Prior to putting the axle into operation, fill in the oil acc. to the lubrication instructions.
3-202
3) D ISASSEMBLY OF DIFFERENTIAL
CARRIER AND BRAKE TUBES
(1) Disassembly of differential carrier
Η Fasten axle on assembly truck.
ö Special tool
Assembly truck 5870 350 000
Holding fixtures 5870 350 077
Clamps 5870 350 075
7577AAXF001
7577AAXF002
7577AAXF003
7577AAXF007
3-203
Κ Separate complete output from the axle
casing.
ö Pay attention to released O-ring(see arrow).
7577AAXF008
7577AAXF009
7577AAXF081
7577AAXF082
3-204
Ξ Fasten differential carrier to assembly
truck.
ö Special tool
Assembly truck 5870 350 000
Holding fixture 5870 350 034
7577AAXF083
7577AAXF084
7577AAXF085
7577AAXF086
3-205
Loosen hexagon screws and take off
bearing bracket.
Loosen hexagon screws by hand only.
7577AAXF087
7577AAXF088
7577AAXF089
7577AAXF090
3-206
Pull bearing inner ring from the housing
cover.
ö Special tool
Rapid grip 5873 012 018
Basic set 5873 002 001
7577AAXF091
7577AAXF092
7707AAXR001
7577AAXF093
3-207
Press off crown wheel from the
differential housing.
7577AAXF094
7577AAXF096
7577AAXF097
3-208
Press shaft seal out of the axle drive
housing.
7577AAXF098
7577AAXF099
7577AAXF100
7577AAXF101
3-209
(2) Disassembly of brake tubes
Η Remove screw plug with vent valve from
the axle casing.
7577AAXF102
7577AAXF103
7577AAXF104
7577AAXF105
3-210
Λ Remove vent valve from the connection
part.
7577AAXF106
7577AAXF107
3-211
4) REASSEMBLY OF BRAKE TUBES AND
DIFFERENTIAL CARRIER
(1) Reassembly of brake tubes
1 2
Η Preassemble connection part as shown 3
in opposite figure. 4
1 Vent valve
2 Connection part
3 O-Ring
4 Rectangular ring 7577AAXF108
7577AAXF109
7577AAXF110
7577AAXF111
3-212
Λ Insert brake tube into the axle casing,
assembling the connection part (see
arrow 1) through the union screw (see
arrow 2).
1
2
7577AAXF112
7577AAXF113
7577AAXF114
7577AAXF115
3-213
Ξ Install screw plug.
ÂTightening torque : 7.1kgfÂm
(51.6lbfÂft)
7577AAXF116
3-214
(2) Reassembly of differential carrier
ö If crown wheel or drive pinion are dam-
aged, both parts have to be replaced
together.
For new installation of a complete bevel
gear set pay attention to the same pair
number of drive pinion and crown wheel.
x
measuring shaft (2) (see sketch).
a
ö Special tool
3
Adapter pieces 5870 500 044
Measuring shaft 5870 500 001 4
Measuring pin 5870 351 016
7577AAXF117
Stop washer 5870 351 029
3-215
Ι Determine dimension I (bearing width).
Dimension I e.g . . . . . . . . . . . . 39.05mm
ö Special tool
Digital depth gauge 5870 200 072
Gauge blocks 5870 200 066
7577AAXF119
7577AAXF120
EXAMPLE C :
Dimension X . . . . . . . . . . . . . 221.20mm
Dimension Y . . . . . . . . . . . . - 220.10mm
Difference = shim e.g. s = 1.10mm
7577AAXF121
3-216
Μ Undercool bearing outer ring and insert it
into the bearing bore until contact.
ö Special tool
Driver 5870 058 060
Handle 5870 260 002
7577AAXF122
7577AAXF123
7577AAXF124
3-217
Π Insert preassembled drive pinion into the
axle drive housing and assemble the
heated bearing inner ring until contact.
7577AAXF126
7577AAXF127
7577AAXF128
⑬ Assemble washer.
7577AAXF129
3-218
Τ Unscrew hexagon nut by hand and
tighten it.
ÂTightening torque : 122kgfÂm
(885lbfÂft)
ö Special tool
Slotted nut wrench 5870 401 139
Fixture 5870 240 002
ö When tightening rotate drive pinion in
both directions several times.
7577AAXF130
7577AAXF133
3-219
Reassembly of limited slip differential
Place both thrust washers into the
differential housing.
ö Prior to installation all single parts of the
differential must be oiled.
7577AAXF134
7577AAXF135
7577AAXF136
7577AAXF137
3-220
Preassemble differential spider and
insert it into the differential housing.
7577AAXF138
7577AAXF139
7577AAXF140
7577AAXF141
3-221
Determine disc clearance 0.2~0.8mm
Determine dimension I, from mounting
face of the differential housing to plane
face of the outer clutch disc.
Dimension I e.g . . . . . . . . . . . . 44.30mm
ö Special tool
Digital depth gauge 5870 200 072
7577AAXF142
7577AAXF144
3-222
Put on the housing cover and fasten it by
means of cap screws(2EA).
ÂTightening torque (M10/8.8) :
4.7kgfÂm(33.9lbfÂft)
7707AAXF015
7577AAXF145
7577AAXF146
7577AAXF147
3-223
Insert differential into the axle drive
housing by means of lifting tackle.
ö Special tool
Lifting tackle 5870 281 013
7577AAXF148
7577AAXF149
7577AAXF150
7577AAXF151
3-224
Preliminarily fix the crown wheel-sided
bearing outer ring by means of the
second adjusting nut.
7577AAXF152
3-225
Cover some tooth flanks of the crown
wheel with marking ink and roll crown
wheel in both directions over the drive
pinion.
Compare the obtained tooth contact
pattern with the examples on page 3-228
If the tooth contact pattern differs,
there has been a measuring error at
determination of the shim (Figure
7577AAXF156
7577AAXF121/page 3-216), what is
imperative to be corrected.
Secure both adjusting nuts by means of
slotted pins.
7577AAXF157
7577AAXF159
3-226
Insert stub shaft into spline of the axle
bevel gear until contact.
Then fix O-ring (see arrow) by means of
grease into the recess of the axle casing.
ö Step (Figure 7577AAXF160 ~ 163) is to
be made on both output sides.
7577AAXF160
7577AAXF161
7577AAXF162
7577AAXF163
3-227
ö BACKLASH CHECK
- Applied the paint (or red lead) on the surface of several bevel gear teeth.
- Turn the pinioin gear and check the contact pattern.
Correct pattern
WTHAX16 WTHAX17
ö ADJUSTMENT
Incorrect pattern : high contact
WTHAX18 WTHAX19
(-)
WTHAX20
3-228
Incorrect pattern, low contact
WTHAX21 WTHAX22
(+)
WTHAX23
3-229
 REAR AXLE
1) DISASSEMBLY OF OUTPUT AND
BRAKE
(1) Fasten axle on assembly truck.
ö Special tool
Assembly truck 5870 350 000
Holding fixtures 5870 350 077
Clamps 5870 350 075
7577AAXF001
7577AAXF002
7577AAXF003
7577AAXF004
3-230
(4) Pull slotted pin by means of the striker out
of the bore in the slotted nut.
ö Special tool
Striker 5870 650 001
7577AAXF005
7577AAXF006
7577AAXF007
7577AAXF008
3-231
(8) Pull stub shaft out of the sun gear shaft.
ö Pay attention to possibly released shim(s).
7577AAXF009
7577AAXF010
7577AAXF011
7577AAXF012
3-232
(12) Squeeze out the retaining ring.
ö Special tool
Set of external pliers 5870 900 015
7577AAXF013
7577AAXF014
7577AAXF015
ö Special tool
Two-armed puller 5870 970 007
7577AAXF016
3-233
(16) Remove O-rings (see arrows) from the
annular grooves of the ring gear.
7577AAXF017
7577AAXF018
7577AAXF019
7577AAXF020
3-234
(20) Squeeze out the circlip.
ö Special tool
Set of external pliers 5870 900 016
7577AAXF021
7577AAXF022
7577AAXF023
7577AAXF024
3-235
(24) Preload cup springs by means of a press
and squeeze out the circlip.
ö Special tool
Assembly pliers 5870 900 051
Assembly fixture 5870 345 096
7577AAXF025
7577AAXF026
7577AAXF027
7577AAXF028
3-236
(28) Remove guide ring, support rings and U-
rings from the annular grooves of the
brake housing.
ö See below sketch for installation position
of the single parts.
7577AAXF029
To the sketch :
1 Brake housing
1
2 Guide ring
3 Support ring
4 U-ring
5 U-ring
2
6 Support ring 3
7 Output shaft 4
5
6
7577AAXF030
7577AAXF031
3-237
(30) Lift brake housing with lifting tackle from
the output shaft.
ö Special tool
Lifting chain 5870 281 047
Eye bolts 5870 204 071
7577AAXF032
7577AAXF033
7577AAXF034
7577AAXF035
3-238
(34) Press off bearing sheet from the output
shaft.
ö Special tool
Pry bar set 5870 345 065
7577AAXF036
3-239
2) R EASSEMBLY OF OUTPUT AND
BRAKE
(1) Insert wheel bolt into the output shaft until
contact.
ö Special tool
Wheel bolt puller-basic set 5870 610 010
Insert (3/4"-16 UNF) 5870 610 005
7577AAXF037
7577AAXF038
7577AAXF039
7577AAXF040
3-240
(5) Press both bearing outer rings into the
brake housing until contact.
7577AAXF041
To the sketch :
1 Brake housing * *
* 1
2 Shaft seal
* Grease filling 2
ö Fill the space between sealing and dust
lips with grease.
7577AAXF043
7577AAXF044
3-241
(8) Heat the roller bearing and install it until
contact.
7577AAXF045
7577AAXF046
To the sketch :
1 Brake housing
1
2 Guide ring
3 Support ring
4 U-ring
5 U-ring
2
6 Support ring 3
7 Output shaft 4
5
6
7577AAXF047
3-242
(10) Clean annular groove of the brake housing
with spirit.
Then insert the guide ring into the annular
groove (also see sketch page 3-242) and
fix it with Loctite (Type No. 415) at its
extremities.
ö Guide ring must have contact on the
whole circumference.
Upon installation the orifice of the guide 7577AAXF048
7577AAXF049
7577AAXF050
3-243
(14) Install cup springs (7 pieces each/pin ).
ö Pay attention to the installation position of
the cup springs, see below sketch.
7577AAXF052
To the sketch : 5 4
1 Pin
2 Gripping rings
3
3 Cup springs
X
4 Support shim
5 Circlip 2
X Installation dimension gripping rings
10.5 + 0,3 mm 1
7577AAXF053
7577AAXF054
7577AAXF055
3-244
(17) Fix support shim by means of the circlip.
7577AAXF056
7577AAXF057
To the sketch :
1 2 34 5
"X"
1 Brake housing
2 Circlip
3 Slotted pin
4 Support shim
5 Piston
X Installation dimension 4.0 -0,5 mm
7577AAXF058
7577AAXF059
3-245
(20) Insert planet carrier into the spline of the
output shaft until contact.
7577AAXF060
7577AAXF061
7577AAXF062
7577AAXF017
3-246
(24) Install two adjusting screws and insert ring
gear into the brake housing until contact.
ö Special tool
Adjusting screws 5870 204 029
ö Pay attention to radial location.
7577AAXF063
7577AAXF064
7577AAXF065
7577AAXF066
3-247
(28) Fasten plant gears by means of retaining
rings.
ö Special tool
Set of external pliers 5870 900 015
7577AAXF067
7577AAXF069
7577AAXF070
3-248
(32) Determine Dimension II from the face of
the sun gear shaft up to the mounting face
of the axle casing.
Dimension II e.g . . . . . . . . . . . . 43.00mm
ö Special tool
Digital depth gauge 5870 200 072
Gauge blocks 5870 200 066
Straightedge 5870 200 022
7577AAXF071
EXAMPLE A :
Dimension I . . . . . . . . . . . . . . . 46.20mm
Dimension II . . . . . . . . . . . . . - 43.00mm
Difference . . . . . . . . . . . . . . . . 3.20mm
required end play e.g. . . . . . . - 1.00mm
Difference = shim e.g. s = 2.20mm
7577AAXF072
7577AAXF073
3-249
(35) Fix O-ring(see arrow) into the recess of
the axle casing by means of grease and
install the preassembled output to the axle
casing until contact by means of lifting
tackle.
※ Special tool
Lifting bracket 5870 281 043
7577AAXF074
7577AAXF075
7577AAXF077
3-250
(39) Assemble O-ring (see arrow) to the cover.
7577AAXF078
7577AAXF079
3-251
High-pressure test :
Increase test pressure up to p = 100-10 bar and close connection to HP-pump by means of shut-
off valve.
During a 5 min. testing time a pressure drop of max. 2% (2 bar) is allowed.
If the maximum pressure of 100 bar is exceeded, there will be an excessive piston adjust-
ment and a repeated disassembly of the brake or the adjusting is required to reset the
gripping rings to the adjusting dimension.
Low-pressure test :
Reduce test pressure to p = 5 bar and close the shut-off valve again.
During a 5 min. testing time a pressure drop is not allowed.
ö Special tool
HP-Pump 5870 287 007
Mini-measuring hub 5870 950 115
(9/16"- 18UNF)
ö Prior to putting the axle into operation, fill in the oil acc. to the lubrication instructions.
3-252
3) D ISASSEMBLY OF DIFFERENTIAL
CARRIER AND BRAKE TUBES
(1) Disassembly of differential carrier
Η Fasten axle on assembly truck.
ö Special tool
Assembly truck 5870 350 000
Holding fixtures 5870 350 077
Clamps 5870 350 075
7577AAXF001
7577AAXF002
7577AAXF003
7577AAXF007
3-253
Κ Separate complete output from the axle
casing.
ö Pay attention to released O-ring(see arrow).
7577AAXF008
7577AAXF009
7577AAXF081
7577AAXF082
3-254
Ξ Fasten differential carrier to assembly
truck.
ö Special tool
Assembly truck 5870 350 000
Holding fixture 5870 350 004
7577AAXF083
7577AAXF084
7577AAXF085
7577AAXF086
3-255
Loosen hexagon screws and take off
bearing bracket.
Loosen hexagon screws by hand only.
7577AAXF087
7577AAXF088
7577AAXF089
7577AAXF090
3-256
Pull bearing inner ring from the housing
cover.
ö Special tool
Rapid grip 5873 012 012
Basic set 5873 002 001
7577AAXF091
7577AAXF092
7577AAXF093
7577AAXF094
3-257
Disassembly of drive pinion
Heat hexagon nut by means of hot-air
blower.
ö Special tool
Hot-air blower 230 V 5870 221 500
Hot-air blower 115 V 5870 221 501
ö Slotted nut is locked with Loctite (Type
No. 262).
7577AAXF095
7577AAXF096
7577AAXF097
7577AAXF098
3-258
Press drive pinion out of the axle drive
housing by means of two-armed puller
and remove the released bearing inner
ring.
ö Special tool
Two-armed puller 5870 970 007
7577AAXF099
7577AAXF100
7577AAXF101
7577AAXF102
3-259
(2) Disassembly of brake tubes
Η Loosen hexagon nut.
ö Step (Figure 7577AAXF103~107) to be
made on both sides.
7577AAXF103
7577AAXF104
7577AAXF105
7577AAXF106
3-260
Λ Loosen connection part and remove it
from the axle casing.
7577AAXF107
3-261
4) REASSEMBLY OF BRAKE TUBES AND
DIFFERENTIAL CARRIER
(1) Reassembly of brake tubes
1 2
Η Preassemble connection part as shown 3
in opposite figure. 4
1 Vent valve
2 Connection part
3 O-Ring
4 Rectangular ring 7577AAXF108
7577AAXF109
7577AAXF110
7577AAXF111
3-262
Λ Insert brake tube into the axle casing,
assembling the connection part (see
arrow 1) through the union screw (see
arrow 2).
1
2
7577AAXF112
7577AAXF113
7577AAXF114
7577AAXF115
3-263
Ξ Install screw plug.
ÂTightening torque : 7.1kgfÂm
(51.6lbfÂft)
7577AAXF116
3-264
(2) Reassembly of differential carrier
ö If crown wheel or drive pinion are dam-
aged, both parts have to be replaced
together.
For new installation of a complete bevel
gear set pay attention to the same pair
number of drive pinion and crown wheel.
x
measuring shaft (2) (see sketch).
a
ö Special tool
3
Adapter pieces 5870 500 044
Measuring shaft 5870 500 001 4
Measuring pin 5870 351 016
7577AAXF117
Stop washer 5870 351 027
3-265
Ι Determine dimension I (bearing width).
Dimension I e.g . . . . . . . . . . . . 36.00mm
ö Special tool
Digital depth gauge 5870 200 072
Gauge blocks 5870 200 066
7577AAXF119
7577AAXF120
EXAMPLE C :
Dimension X . . . . . . . . . . . . . 205.25mm
Dimension Y . . . . . . . . . . . . - 204.05mm
Difference = shim e.g. s = 1.20mm
7577AAXF121
3-266
Μ Undercool bearing outer ring and insert it
into the bearing bore until contact.
ö Special tool
Driver 5870 058 060
Handle 5870 260 002
7577AAXF122
7577AAXF123
7577AAXF124
3-267
Π Insert preassembled drive pinion into the
axle drive housing and assemble the
heated bearing inner ring until contact.
7577AAXF126
7577AAXF127
7577AAXF128
⑬ Assemble washer.
7577AAXF129
3-268
Τ Unscrew hexagon nut by hand and
tighten it.
ÂTightening torque : 71.4kgfÂm
(516lbfÂft)
ö Special tool
Fixture 5870 240 002
7577AAXF130
3-269
Reassembly of limited slip differential
Place both thrust washers into the
differential housing.
ö Prior to installation all single parts of the
differential must be oiled.
7577AAXF134
7577AAXF135
7577AAXF136
7577AAXF137
3-270
Preassemble differential spider and
insert it into the differential housing.
7577AAXF138
7577AAXF139
7577AAXF140
7577AAXF141
3-271
Determine disc clearance 0.2~0.8mm
Determine dimension I, from mounting
face of the differential housing to plane
face of the outer clutch disc.
Dimension I e.g . . . . . . . . . . . . 38.05mm
ö Special tool
Digital depth gauge 5870 200 072
7577AAXF142
7577AAXF144
3-272
Put on the housing cover.
Then heat crown wheel and install it until
contact.
ö Special tool
Adjusting screws 5870 204 040
7577AAXF145
7577AAXF146
7577AAXF147
7577AAXF148
3-273
Place bearing outer ring into the axle
drive housing.
7577AAXF149
7577AAXF150
7577AAXF151
7577AAXF152
3-274
Put on bearing bracket and fasten it by
means of hexagon screws and washers.
ÂTightening torque (M16/10.9) :
28.6kgfÂm(207lbfÂft)
ö Pay attention to clearance of the adjust-
ing nut.
A pply Loctite (Type No. 262) onto
threads of the hexagon screws.
7577AAXF153
3-275
Secure both adjusting nuts by means of
slotted pins.
7577AAXF157
7577AAXF159
7577AAXF160
3-276
Thrust washer(s) removed at
disassembly have to be fixed in the sun
gear shaft by means of grease.
7577AAXF161
7577AAXF162
7577AAXF163
3-277
SECTION 4 BRAKE SYSTEM
1. OUTLINE
ö The brakes are operated by a pressure compensated, closed center hydraulic system.
Flow is supplied by a fixed displacement, gear type brake pump.
BRAKE SYSTEM
The fixed displacement brake pump supplies flow to the cut-off valve for service brake circuit and
park brake circuits. It flows to three accumulator. The accumulator has a gas precharge and an
inlet check valve to maintain a pressurized volume of oil for reserve brake applications.
Oil through the accumulator flows to the brake valves. The brake valve is a closed center design,
dual circuit operated by a pedal.
The front and rear brakes will operate simultaneously with only one brake pedal depressed.
The differential contains annular brake piston and double sided disk.
Brake pump flow also goes to the parking brake solenoid valve in cut-off valve.
The brake system contains the following components:
ÂBrake pump
ÂParking brake solenoid valve in cut-off valve
ÂCut-off valve
ÂBrake valve
ÂAccumulators
ÂPressure switches
4-1
FULL POWER HYDRAULIC BRAKE
SYSTEM
ADVANTAGES - The full power hydraulic Response time
brake system has several advantages over Full power brake actuation VS
Air/Hydraulic brake actuation
traditional brake actuation systems. These
systems are capable of supplying fluid to a 1000
range of very small and large volume
service brakes with actuation that is faster 900
than air brake systems. Figure represents 800
a time comparison between a typical Brake pressure
700 (Full power)
Brake torque(lbÂin)
air/hydraulic and full power hydraulic brake
actuation system. 600
Brake pressure
Full power systems can supply significantly 500 (Air/hydraulic)
higher brake pressures with relatively low Brake torque
400
reactive pedal forces. The reactive pedal (Air/hydraulic)
force felt by the operator will be proportional 300
Brake torque
to the brake line pressure being generated. 200 (Full power)
This is referred to as brake pressure
modulation. 100
Another key design feature of full power
0 1 2 3 4
systems is the ability to control maximum
brake line pressure. In addition, because Time(seconds)
these systems operate with hydraulic oil,
filtration can be utilized to provide long
component life and low maintenance
operation.
Because these systems are closed center,
by using a properly sized accumulator,
emergency power-off braking that is
identical to power-on braking can be
achieved. These systems can be either
dedicated, where the brake system pump
supplies only the demands of the brake
system or non-dedicated, where the pump
supplies the demands of the brake system
as well as some secondary down stream
hydraulic device.
Another important note is that all seals
within these system must be compatible
with the fluid medium being used.
4-2
2. HYDRAULIC CIRCUIT
FRONT 39 REAR
Parking brake
18
21
BL1 BR1 BL2 BR2
9
T1 P1 T2 P2
16 16
8 B1 A1 B2 A2
17
A3
19 PS T1
PS1
20
P T
Parking brake Return line MCV
solenoid
22
Steering system RCV lever
Fan drive moter
2 1
25
Return line
26
27 28 Return line
24
7607ABS01
4-3
1) SERVICE BRAKE RELEASED
FRONT
39 REAR
18
21
BL1 BR1 BL2 BR2
9
T1 P1 T2 P2
16 16
8 B1 A1 B2 A2
17
A3
19 PS T1
PS1
20
P T
Return line MCV
22
Steering system RCV lever
Fan drive moter
2 1
25
Return line
26
27 28 Return line
24
7607ABS02
When the pedal of brake valve(9) is released, the operating force is eliminated by the force of the
spring, and the spool is returned.
When the spool removes up, the drain port is opened and the hydraulic oil in the piston of axles
return to the tank(26).
Therefore, the service brake is kept released.
4-4
2) SERVICE BRAKE OPERATED
FRONT 39 REAR
18
21
BL1 BR1 BL2 BR2
9
T1 P1 T2 P2
16 16
8 B1 A1 B2 A2
17
A3
19 PS T1
PS1
20
P T
Return line MCV
22
Steering system RCV lever
Fan drive moter
2 1
25
Return line
26
27 28 Return line
24
7607ABS03
When the pedal of brake valve(9) is depressed, the operating force overcomes the force of the
spring, and is transmitted to the spool. When the spool moves down, the inlet port is opened, and
at the same time the hydraulic oil controlled the pressure level by the cut-off valve(8) enters the
piston in the front and rear axles. Therefore, the service brake is applied.
4-5
3) PARKING BRAKE RELEASED
FRONT 39 REAR
Parking brake
18
21
BL1 BR1 BL2 BR2
9
T1 P1 T2 P2
16 16 B
A
8 B1 A1 B2 A2
17
A3 Parking brake switch
19 PS T1
PS1
20
P T
Parking brake Return line MCV
solenoid
22
Steering system RCV lever
Fan drive moter
2 1
25
Return line
26
27 28 Return line
24
7607ABS04
When the parking brake switch is pressed B position, the solenoid valve is energized and the
hydraulic oil controlled the pressure level by the cut-off valve enters the parking brake. It
overcomes the force of the spring and pushes the piston rod. This releases the brake.
Therefore, the hydraulic oil pressure is applied to the parking brake piston through the solenoid
valve and the parking brake is kept released.
4-6
4) PARKING BRAKE OPERATED
FRONT 39 REAR
Parking brake
18
21
BL1 BR1 BL2 BR2
9
T1 P1 T2 P2
16 16 B
A
8 B1 A1 B2 A2
17
A3 Parking brake switch
19 PS T1
PS1
20
P T
Parking brake Return line MCV
solenoid
22
Steering system RCV lever
Fan drive moter
2 1
25
Return line
26
27 28 Return line
24
7607ABS05
When the parking brake switch is pressed A position, the solenoid valve is deenergized and the
valve open the drain port.
At the same time, the hydraulic oil in the parking brake return to the tank through the solenoid valve.
When the piston rod is returned by the force of the spring, the parking brake is applied.
4-7
3. BRAKE PUMP(+FAN PUMP)
1) STRUCTURE
17 Brake pump
16
2
3 11
13
14 15
23 18
22 19
21 18
7
18
1716 3 10
3
A 9 A
12
14
15 18
20
6
1 5
8
Fan pump 4
7707BS19
4-8
2) PRINCIPLE OF OPERATION
(1) Mechanism for delivering oil
The drawing at right shows the
operational principle of an external gear
pump in which two gears are rotating in
mesh.
The oil entering through the suction port is Suction Discharge
trapped in the space between two gear
teeth, and is delivered to the discharge
port as the gear rotates.
Except for the oil at the bottom of the gear
teeth, the oil trapped between the gear
teeth, is prevented from returning to the
suction side with the gears in mesh.
Since the gears are constantly delivering
oil, the oil delivered to the discharge port
is forced out of the port.
The amount of discharge increases with
the speed of rotation of the gear.
If there is no resistance in the oil passage
into which the discharged oil flows, the oil
merely flows through the passage,
producing no increase in pressure.
If however, the oil passage is blocked with
something like a hydraulic cylinder, there
will be no other place for the oil to flow, so
the oil pressure will rise. But the pressure
which rises in this way will never go
higher, once the hydraulic cylinder piston
starts moving because of the oil pressure.
As described earlier, the pump produces
the oil flow, but not the oil pressure. We
can therefore conclude that pressure is a
consequence of load.
In other words, the pressure depends on
a counterpart.
(770-3ATM) 4-9
4-9
(2) Internal oil leakage
Oil leaks from a place under higher
pressure to a place under lower pressure,
provided that a gap or a clearance exists
in between.
In the gear pump, small clearances are
provided between the gear and the case
and between the gear and the side plate
to allow the oil to leak out and to serve as
a lubricant so that the pump will be rge
scha
protected from seizure and binding. Di
The drawing at right shows how the
leaked oil flows in the pump. As such,
there is always oil leakage in the pump
from the discharge side(under higher
pressure) to the suction side. The
n
delivery of the pump is reduced by an ctio
Su
amount equal to the pump discharge.
In addition, the delivery of the pump will
also decrease as the amount of oil
leakage increases because of expanded
radial clearance resulting from the wear of
pump parts, the lower oil viscosity
resulting from increases in the oil
temperature, and the initial use of low
(770-3ATM) 4-10
viscosity oil.
4-10
(3) Forces acting on the gear
The gear, whose outer surface is
subjected to oil pressure, receives forces
jointing towards its center.
Due to the action of the delivery pressure,
the oil pressure in higher on the delivery
side of the pump, and due to suction
pressure, is lower on the suction side. In
the intermediate section, the pressure will
gradually lower as the position moves
from the delivery side to the suction side. Drive gear
This phenomenon is shown in the drawing
at right.
In addition, the gears in mesh will receive Suction Discharge
interacting forces. side side
These forces pushing the gears toward
the suction side are received by the
bearings. Since the gears are pressed Driven gear
toward the suction side by these forces,
the radial clearance becomes smaller on
the suction side in the case. In some
pumps, the clearance may become zero, Pressure distribution
thus allowing the gear teeth and the case
to come into light contact.
For this reason, an excessive increase in
the delivery pressure must be avoided,
since it will produce a large force which
will act on the gears, placing an overload
on the bearings, and resulting in a
shortened service life of the bearing or
interference of the gear with the case. (770-3ATM) 4-11
4-11
4. BRAKE VALVE
1) STRUCTURE
18
17
19
23 22
24
21
2
20 8
9
25
30
25
16 14
15 7
5 13
31
12 6
1 10
26
4
11
3
7807ABS21
4-12
2) OPERATION
T1 P1 T2 P2
Hydraulic circuit
7807ABS22
4-13
(1) Purpose
The purpose of the brake valve is to sensitively increase and decrease the braking pressure when
the brake pedal is actuated.
(2) Ready position
When the braking system is ready for operation, its accumulator pressure acts directly on ports
(P1, P2) of the brake valve. A connection is established between ports(BR1, BR2) and ports(T1,
T2) so that the wheel brakes ports(BR1, BR2) are pressureless via the returns ports(T1, T2).
(3) Partial braking
When the brake valve is actuated, an amount of hydraulic pressure is output as a ratio of the foot
force applied.
The spring assembly(8) beneath base plate(16) is designed in such a way that the braking
pressure changes depending on the angle. In the lower braking pressure range, the machine
can be slowed sensitively.
When the braking process is commenced, the upper spool is mechanically actuated via spring
assembly(8), and the lower spool is actuated hydraulically by spool. As spools(3) move
downward, they will first close returns(T1, T2) via the control edges, thus establishing a
connection between accumulator ports(P1, P2) and ports(BR1, BR2) for the wheel brake
cylinders. The foot force applied now determines the output braking pressure. The control
spools(3) are held in the control position by the force applied(Spring assembly above the spools
and the hydraulic pressure below the spool(Balance of forces).
After output of the braking pressure, spools(3) are in a partial braking position, causing ports(P1,
P2) and ports(T1, T2) to close and holding the pressure in ports(BR1, BR2).
(4) Full braking position
When pedal is fully actuated, end position of the brakes is reached and a connection established
between accumulator ports(P1, P2) and brake cylinder ports(BR1, BR2). Returns(T1, T2) are
closed at this point.
When the braking process is ended, a connection is once again established between brake
cylinder ports(BR1, BR2) and return ports(T1, T2), closing accumulator ports(P1, P2).
The arrangement of spools in the valve ensures that even if one braking circuit fails the other
remains fully operational. This is achieved by means of the mechanical actuation of both spools
and requires slightly more pedal travel.
(5) Limiting the braking pressure
Pedal restriction bolt(23) on base plate below pedal is used to limit the braking pressure.
(6) Failure of a circuit
In the event of the lower circuit failing, the upper circuit will remain operational. Spring assembly
(8) will mechanically actuate spool. In the event of the upper circuit failing, the lower circuit will
remain operational since the lower spool(31) is mechanically actuated by spring assembly(21)
and spool.
(7) Installation requirements
Return lines(T1, T2) must be connected directly to the tank.
The connecting lines must be installed is such a way as to permit proper bleeding.
4-14
(8) Maintenance of the brake valve
No special maintenance beyond the legal requirements is necessary.
When using high-pressure cleaners on the machine, please make sure that the water jet is not
aimed directly at the brake valve(To prevent damaging the bellows).
For safety reasons the whole of the brake valve must be replaced if parts other than those
listed above are damaged.
(9) Repair work
When working on the braking system, always make sure that there is absolutely no
pressure in the system. Even when the engine is switched off there will be some residual
pressure in the system.
ö When doing repair work, make sure your environment is very clean.
Immediately close all open ports on the components and on pipes using plugs.
(10) Replacing the pedal cover
Pedal cover(18) is simply pulled of by hand. The new pedal cover is pushed over pedal(17) and
tightened manually. Fasten the bellows with the strap retainers.
(11) Replacing the complete actuating mechanism
Carefully clamp the unit vertically in a fixture. The actuating mechanism can be removed by
taking out the four bolts. Make sure that spring assembly(8) does not fall out. When installing the
new actuating mechanism, make sure that spring assembly(8) is fitted in the right order. Tighten
the four bolts(25).
(12) Replacing the bellows
To change bellows(19) it is advisable to remove pedal(17). For this purpose, loosen retaining ring
(22) and knock out pin(20) using a mandrill. When knocking out the bolt, make sure that the
mandrill is applied to the side of the bolt without a knurl. Remove pedal(17) and bellows(19).
Now fit the new bellows and proceed in reverse order as described above. The upper portion of
bellows is fastened to piston, its lower portion to base plate(16) secure the bellows using clamps.
4-15
5. CUT-OFF VALVE
1) STRUCTURE
3 4
5 C B
D D
P PS1
A A
C B
SECTION A - A SECTION B - B
1 2
HYDRAULIC SYMBOL
B1 A1 A2 B2
A1 A2
A3
PS
PS T1 T1
B1 B2 B
PS1
A3
B
P T
SECTION C - C SECTION D - D
7707ABS06
2) OPERATION
When the pump works, the oil under the pressure flows into P port.
The oil in P port is stored in the accumulator on A3 port.
As the pressure on P line rises to 150bar, the cut off valve(1) starts cut-offing and the oil in the P
port is unloaded. The pressure on P line goes down 120bar by the minute leakage from valve and
other factors.
At this pressure, the cut-off valve starts cut-ining.
This process is repeated in the regular period of 30~40 seconds.
4-16
6. BRAKE ACCUMULATOR
1) STRUCTURE
81L1-0004 81L1-0003
Item
(Item16) (Item17)
Diameter 121mm 136mm
Mounting height 146mm 160mm
Norminal volume 0.75m 3
1.0m3
Priming pressure 50kgf/cm2 50kgf/cm2
Operating medium Oil Oil
B
Operating pressure Max 210kgf/cm 2
Max 200kgf/cm2
Thread M18Ý1.5 M18Ý1.5
A
C Priming gas Nitrogen Nitrogen
(770-3ATM) 4-22
2) OPERATION
(1) Purpose
Fluids are practically incompressible and are thus incapable of accumulating pressure energy. In
hydropneumatic accumulators, the compressibility of a gas is utilized to accumulate fluid. The
compressible medium used in the accumulators is nitrogen.
In braking systems, the purpose of the accumulators is to store the energy supplied by the
hydraulic pump. They are also used as an energy reserve when the pump is not working, as a
compensator for any losses through leakage, and as oscillation dampers.
(2) Operation
The accumulator consists of a fluid portion (A) and a gas portion (B) with a diaphragm (C) as a
gas-tight dividing element. The fluid portion (A) is connected to the hydraulic circuit, causing the
diaphragm accumulator to be filled and the gas volume to be compressed as the pressure rises.
When the pressure falls, the compressed gas volume will expand, thus displacing the
accumulated pressure fluid into the circuit.
The diaphragm bottom contains a valve disk (D) which, if the diaphragm accumulator is
completely empty, closes the hydraulic outlet, thus preventing damage to the diaphragm.
(3) Installation requirements
The accumulators can be fitted in the hydraulic circuit, directly on a component or in blocks on
suitable consoles.
They should be fitted in as cool a location as possible.
Installation can be in any position.
4-17
(4) Maintenance of the accumulator
No special maintenance beyond the legal requirements is necessary.
The accumulator should be checked annually. It should be replaced if the initial gas pressure has
fallen by more than 30%(Please refer to Performance testing and checking of the accumulator).
(5) Disposal of the accumulator
Before the accumulator is scrapped, its gas filling pressure must be reduced. For this purpose,
drill a hole through gas chamber(B) using a drill approx. 3mm in diameter. The gas chamber is
located on the side opposite the threaded port above the welding seam around the center of the
accumulator.
ö Wear safety goggles when doing this job.
(6) Performance testing and checking of the accumulator
The accumulator is gradually pressurized via the test pump; until the initial gas pressure is
reached, the hydraulic pressure in the accumulator will rise abruptly. This is apparent from gauge
M. If the initial gas pressure is more than 30% below the prescribed value, the accumulator
needs to be replaced. If the measuring process needs to be repeated, wait for intervals of 3
minutes between the individual tests. Any accumulator whose initial gas pressure is insufficient
must be scrapped following the instructions under Disposal of the accumulator.
The amount of initial gas pressure can also be checked from the vehicle. Start the vehicle's
engine. The pump will now supply oil to the accumulators. Until the initial gas pressure is
reached, the hydraulic pressure in the accumulator will rise abruptly. This is apparent from the
gauge in the cab. If the initial gas pressure is more than 30% below the prescribed value, that
initial pressure lies outside the permissible range for at least one of the accumulators fitted in the
vehicle. This accumulator can be traced only by using the method described above, i.e. all
accumulators have to be individually tested. The accumulator whose initial gas pressure is
insufficient must be replaced and scrapped following the instruction under Disposal of the
accumulator.
Accumulator M
A Safety valve
(770-3ATM) 4-23
4-18
(7) Repair work
When working on the braking system, always make sure that there is absolutely no
pressure in the system. Even when the engine in switched off there will be some residual
pressure in the system.
ö When doing repair work, make sure your environment is very clean.
Immediately close all open ports on the components and on pipes using plugs.
For safety reasons the accumulators need to be replaced as a whole if damaged.
4-19
7. PRESSURE SWITCHES
1) STRUCTURE
ÂNormally closed
H1
ÂNormally open
H2
(770-3ATM) 4-25
ÂTechnical data
H1 H2 Adjusting range Adjusting pressure Voltage
Item Type Medium G
mm mm kgf/cm2 kgf/cm2 V
4-20
2) OPERATION
(1) Purpose
The pressure switches are used to visually or audibly warn the driver of the pressure within the
system.
(2) Make contact / circuit closer
The pressure switch can be fitted in the braking system or directly on one of its components.
The system pressure acts on an absorption area within the switch, making an electrical contact as
the pressure on that area is increased. The resulting current is used to activate a warning facility,
for instance.
(3) Break contact / circuit breaker
The pressure switch can be fitted in the braking system or directly on one of its components.
The system pressure acts on a absorption area within the switch, breaking an electrical contact
as the pressure on that area is increased. The current is now broken, e.g. to deactivate a
warning facility.
(4) Installation requirements
No special measures need to be taken.
(5) Maintenance of the pressure switch
No special maintenance beyond the legal requirements is necessary.
When using high-pressure cleaners on the vehicle, please make sure that the water jet is not
directed at the pressure switch(Corrosion of contacts).
(6) Repair work
When working on the braking system, always make sure that there is absolutely no
pressure in the system. Even when the engine is switched off there will be some residual
pressure in the system.
ö When doing repair work, make sure your environment is very clean.
Immediately close all open ports on the components and on pipes using plugs.
ö For safety reasons the pressure switch needs to be replaced as a whole if damaged.
4-21
(7) Adjusting and testing pressure switch
The adjusting screw located between the two contact plugs can be set to the desired value within
a certain range. For adjusting range, please refer to the table Technical data on the previous
page.
After making the adjustment, the adjusting screw should be secured using wax or a similar
material.
()
(+) Screw
(770-3ATM) 4-25
4-22
8. PARKING BRAKE SYSTEM (VOLVO AXLE)
 Machine serial No. ; ~#0293
25
24
1
22
21 6
23
2 9
29
28
26
12
10 16
11
17
14
8 13
15
8 19
18
20
Flange 11 10
27
3
5 4
7607ABS06
4-23
PARKING BRAKE SYSTEM (ZF AXLE)
 Machine serial No. ; #0294~
1) STRUCTURE
7
3
6
5
100D7BS111
2) OPERATION
The two identical brake pads and slide freely on the guide bolt, which is fastened in the housing.
The guide bolts are guided in an additional brake anchor plate which in turn is screwed onto the
vehicle, i.e. its axle.
On actuation, the brake generates a clamping force at the brake lining pads, which cause a
tangential force/braking moment to be generated at the brake disk, the extent of which depends on
the coefficients of friction generated by the linings.
The clamping force is generated by the bank of cup springs, during which the piston is moved
together with the adjusting screw, the thrust bolt and the brake pad towards the brake disk.
When the brake pad comes into contact with the brake disk, the reaction force shifts the housing
onto the guide bolts until the brake pad is also pressed against the brake disk.
The brake is released by complete pre-tensioning of the bank of cup springs. Du-ring this process,
through application of the necessary release pressure after overcoming the cup spring force, the
piston must move back until it comes to rest against the pressure ring.
The clamping force diminishes with wear of the brake lining and brake disk. The brake must be
adjusted at the latest at the times indicated by the adjusting specification followings.
4-24
3) MOUNTING AND BASIC SETTING REGULATIONS
Basic brake setting is required after mounting new brake lining plates or brake disks, as well as
during all repair stages and in the event of insufficient braking performance.
6
2
1
3
4
P
5
S
100D7BS112
ö All mounting and basic setting work must be carried out on the brake when cold.
(1) Mounting the brake
Η Stand the vehicle on an even surface and secure against rolling away.
Θ Release the screw cap.
Ι Release the lock nut(size 24 or 30) and turn the adjusting screw anticlockwise using a size 8 or
10 socket wrench until the pressure bolt comes to rest against the even surface of the piston. In
this status, the brake can be mounted onto the brake disk and fastened.
Κ Mount the pressure connection again.
Apply the necessary release pressure to the brake until the bank of cup springs is completely
pre-tensioned. Following carry out the following page basic setting regulation.
4-25
(2) BASIC SETTING REGULATION
Η Turn the adjusting screw manually clockwise until both brake pads make contact with the brake
disk. Then it is not longer possible to turn the adjusting screw without exerting a major amount of
force.
Θ Turn the adjusting screw anticlockwise in order to set the following rated clearances.
Ι Hold the adjusting screw in position with a hexagonal socket wrench and lock with lock nut.
Κ Mount the screw cap and tighten as far as possible manually.
Λ Mount the pressure connection in accordance with the instructions of the axle.
ö For bleeding the piston chamber use the socket spanner size 13 for the bleeding valve.
(3) ADJUSTING REGULATIONS
During this adjusting process, the parking brake must be released, i.e. the bank of cup springs
must be completely pre-tensioned.
Η Stand the vehicle on an even surface and secure against rolling away.
Θ Release the parking brake by using the required release pressure.
Ι Release the screw cap and unscrew.
Κ Release the lock nut(size 24 or 30) and turn the adjusting screw with socket wrench size 8 or 10
manually clockwise until the two brake pads make contact with the brake disk.
Λ Turn the adjusting screw anti-clockwise and set the clearance specified in the above table.
Μ Hold the adjusting screw in position with the hexagonal socket wrench and lock with the lock nut.
Ν Mount the screw cap and tighten as far as possible manually.
ö Actuate the brake valve several times and check the braking efficiency of the parking brake on a
slope.
4-26
4) EMERGENCY RELEASE OF THE PARKING BRAKE
After the failure of the pressure release the parking brake by using following manual procedure.
2
1
P
S 4
5 3
100D7BS117
4-27
5) MAINTENANCE AND REPAIR WORK
(1) Maintenance and exchange of brake pads
The brake pads themselves are maintenance free. All that is required here is a check for
damaged parts, as well as inspection to ensure that the brake disk remains easy running.
The thickness of the brake lining must be subjected to a visual inspection at regular intervals,
which depend on vehicle usage, but every six months at the latest. In the event of a minimal
residual lining thickness, these intervals must be reduced accordingly in order to avoid major
damage to the brake or disk.
Min. residual thickness 1.0mm per lining pad(6mm carrier plate thickness).
1
2
S1 2
4
P
3
S
100D7BS113
ö Only original spare lining plates may be used. If any other spare parts are used, no warranty
claims will be accepted either for the brakes or their functional characteristics.
Η Stand the vehicle on an even surface and secure against rolling away.
Θ Release the parking brake by applying the required release pressure.
Ι Release the screw cap and unscrew.
Κ Release the lock nut(size 24 or 30) and turn the adjusting screw with socket wrench size 8 or 10
manually clockwise until it lies flush with the inside of the piston.
Λ Press back the thrust bolt using a suitable screwdriver until it has contact with the piston.
4-28
6b
6a
1
4
5
3 2
100D7BS114
Μ Depending on the free space available, release one of the two guide bolts, removing the safety
splint, unscrewing the castellated nut and pulling the guide bolt out of the brake anchor plate.
Now, the brake lining pads can be removed tangentially to the brake disk.
ö In the event of minimal clearance, i.e. it is not possible for space reasons to exchange the brake
lining plate in accordance with these instructions, the brake must be removed completely. To do
this, pull both guide bolts out of the brake anchor plate.
Check the pressure hose. If the pressure hose is to short, it must be unscrewed to remove
the brake. Before the pressure hose can be released the brake must be emergency
released.
Ν Exchange the brake pads and insert the guide bolts into the brake anchor plate. If you have
removed the complete brake you have to amount the brake on both guide bolt again, now.
Ξ Check both permanent magnets if they still have sufficient magnetic force to hold the brake lining
plates. Should this not be the case, the permanent magnets must also be changed by using a
suitable screw driver.
Ο Secure the guide bolt with the castellated nut and the safety splint respective safety clip.
After mounting new brake lining plates or their repair, the brake must be correctly set in
accordance with the instructions "Adjusting regulations".
4-29
(2) Changing the seal
A
B
3
1 2
8
9 4
7
6
5
DETAIL A DETAIL B
100D7BS115
4-30
Ο Change all seals and mount the parts of the brake in other way round order. By mounting the
piston, the sliding and sealing surfaces must be greased lightly using lubricating grease to DIN
51825. The dust protection cap is fitted with a vulcanized-in steel ring which is used to press it
through the locating hole. For exchanging, "lever out" the ring using a suitable tool. The new
dust protection cap must be pressed in with the aid of a suitable mounting ring and screw clamps
or a lever press.
(2) General
Any discovered defects or damage to parts not listed here must naturally be repaired or replaced
using original parts.
For any other information not contained in these instructions or for more detailed instructions,
please contact Hyundai dealer.
4-31
GROUP 2 OPERATIONAL CHECKS AND TROUBLESHOOTING
1. OPERATIONAL CHECKS
This procedure is designed so the mechanic can make a quick check of the system using a minimum
amount of diagnostic equipment. If you need additional information, read structure and function,
Group 1.
A location will be required which is level and has adequate space to complete the checks.
The engine and all other major components must be at operating temperature for some checks.
Locate system check in the left column and read completely, following the sequence from left to right.
Read each check completely before performing.
At the end of each check, if no problem is found(OK), that check is complete or an additional check is
needed. If problem is indicated(NOT OK), you will be given repair required and group location.
If verification is needed, you will be given next best source of information:
Chapter 2 : Troubleshooting
Group 3 : Tests and adjustments
4-32
öHydraulic oil must be at operating temperature for these checks(Refer to page 6-50).
4-33
Item Description Service action
4-34
Item Description Service action
Brake accumulator Start and run engine for 30 OK
precharge check seconds. Check completed.
öThe axles and hydraulic
Stop engine and turn start switch to NOT OK
oil must be at operating
ON and wait 5 seconds. Make sure brake pedal is
temperature for this
not binding and keeping
check. NOTE : Engine oil pressure lamp
brakes partially engaged.
will be on due to no engine oil
pressure. Bleed brakes in group 3.
Count the number of times the Check brake system
brake pedal can be fully depressed pressure in group 3.
before the low brake pressure
NOT OK
warning lamp comes ON.
If light comes on with
LOOK : Warning lamp must come engine running, accumulator
on in 1-5 applications. has lost it's charge.
Inspect and recharge
Start engine and operate at low
accumulator, group 3.
idle.
Observe cluster while applying
brake pedal with maximum force.
LOOK/LISTEN : Brake pressure
indicator must not come ON.
4-35
Item Description Service action
4-36
2. TROUBLESHOOTING
1) SERVICE BRAKE
Diagnose malfunction charts are arranged from most probable and simplest to verify, to least likely,
more difficult to verify. Remember the following steps when troubleshooting a problem :
Step 1. Operational check out procedure(See section 1)
Step 2. Operational checks(In this group)
Step 3. Troubleshooting
Step 4. Tests and adjustments(See group 3)
Brakes drag Brake pedal not returning Inspect floor mat and pedal.
properly
Debris holding valve partially Do brake valve pressure test.
open in brake valve
Warped brake disk Inspect brake disk.
Stuck brake piston Repair.
4-37
Problem Cause Remedy
Hissing noise when Leakage in brake valve, or brake Do brake system leakage test.
brake pedal is held with piston
engine stopped
4-38
2) PARKING BRAKE MALFUNCTIONS
Brake will not hold Pads not adjusted correctly Adjust parking brake.
Malfunctioning parking brake Inspect and replace.
solenoid
Worn brake disk and / or brake Disassemble, inspect, repair.
pads
Brake piston hangs up in bore Remove and inspect. Repair.
Parking brake indicator Faulty wiring or switch Inspect for loose or broken lines between brake
in monitor does not pressure switch and indicator on dash.
come on when brake Inspect for a faulty indicator on dash. Replace if
applied necessary.
Brake will not apply Pads out of adjustment Adjust parking brake.
Malfunctioning wiring, switch, or Check electric circuit.
solenoid
Restriction between brake valve Remove hose and inspect. Replace.
and brake
4-39
GROUP 3 TESTS AND ADJUSTMENTS
2) MEASURING PROCEDURE
(1) Start the engine and drive the machine
straight up a 1/5 gradient with the bucket
unloaded.
(2) Depress the service brake, place the gear
selector lever in neutral, then stop the
engine.
(3) Turn the parking brake switch ON, then
20%
slowly release the service brake pedal 11 20' gradient
and the machine must be kept stopped.
ö The measurement must be made with
the machine facing either up or down
the slope. 7707ABS17
Brake disc
7707ABS26
4-40
3. HYDRAULIC BRAKE BLEEDING PROCEDURE
Escaping fluid under pressure can
penetrate the skin causing serious injury.
Avoid the hazard by relieving pressure
before disconnecting hydraulic or other
lines. Tighten all connections before Breather vent B
applying pressure.
Air breather
Search for leaks with a piece of cardboard.
Protect hands and body from high Breather vent
pressure fluids.
ö If an accident occurs, see a doctor
immediately. Any fluid injected into the
skin must be surgically removed within a A
few hours or gangrene may result.
Doctors unfamiliar with this type of injury
should reference a knowledgeable medical
source.
Two people are required to bleed brake
system oil, one to operate brake valve and
other to open and close bleed screws.
1) Install frame locking bar. Engage parking
brake.
2) Put a clear plastic tube on bleed screw(B)
to route low to hydraulic oil tank filler tube
or container(A).
3) Start engine and run at low idle. Safety lock bar
4) Push and hold brake pedal down until brake
bleeding procedure is complete.
ö If bubbles continue for more than 2
minutes, stop bleeding procedure.
Check for and correct problem, then
continue.
5) Open on bleed screw on differential and
axle assembly until hydraulic oil starts to
flow. Close bleed screw when oil is free of
air. Release brake pedal.
6) Repeat steps 1)~5) for each bleed screw.
7) Push either brake pedal and hold down.
8) Check hydraulic oil level. 7707ABS18
4-41
GROUP 4 DISASSEMBLY AND ASSEMBLY
1. BRAKE PUMP
1) STRUCTURE
17 Brake pump
16
2
3 11
13
14 15
23 18
22 19
21 18
7
18
1716 3 10
3
A 9 A
12
14
15 18
20
6
1 5
8
Fan pump 4
7707BS19
4-42
2) DISASSEMBLY
17
16
2
3 11
13
14 15
23 18
22 19
21 18
7
18
1716 3 10
3
A 9 A
12
14
15 18
20
6
1 5
8
4
7707BS25
ö Before disassembling ensure that the unit itself, bench and tools are thoroughly clean.
(1) Lightly mark the rear cover(21), body(2) and plate(19) to ensure reassembly in the correct
position.
(2) Remove the bolts(23) and separate the brake pump unit from the fan pump using a soft faced
hammer.
(3) Remove splined coupling(20).
(4) Remove the plate(19) from the body(2), free from plate using a soft faced hammer.
(5) Remove the backing ring(15), the seal element(14) and the body O-ring(18).
(6) Remove the rear cover(21) from the body(2).
(7) Remove the backing ring(17), the seal element(16) and the body O-ring(18).
ö Before removing the internal components each bushing(7, 13) must be marked to denote its
location within the body. On the plain area of the bush away from the seal location, lightly mark.
(8) With the unit laying on its side grasp hold of the drive shaft(10) and pull it squarely out of the
body(2) bringing the bushing(13) with it.
(9) Remove the driven gear(11) and the remaining bushing(7).
4-43
3) INSPECTION AND REPAIR
(1) Assessment
Each components should be thoroughly cleaned, carefully examined and assessed for suitability
re-use. Below is a guide for inspecting the various components.
(2) Body
Η Inspect the body bore cut-in where both gears wipe into the body.
Θ The body can only be re-used if the cut-in is bright and polished in appearance and the depth
does not exceed 0.15mm(0.006").
Ι The body should be replaced if the surface is scored, has a matt appearance or shows signs that
the tip of the gears have dug in and torn away the surface material.
Κ The body should be inspected to ensure that there is no superficial damage which may adversely
effect performance or sealing. Pay particular attention to the port threads and body O-ring seal
recesses.
(3) Plate and cover
Η The inner surfaces should be inspected to ensure that there is no unusual wear or scoring in the
regions where the body O-rings and backing rings contact, which result in external leakage.
Θ Check the shaft seal recess for scoring or damage that could result in oil leakage around the
outer diameter of the shaft seal. Replacement shaft seals can be refitted with Loctite hydraulic
sealant to overcome slight damage in this area.
(4) Bushes
Η The side faces which abut the gears should be perfectly flat showing no sign of scoring.
Characteristically there are bright polished areas on this surface caused by loading against the
gear side faces, which is often more pronounced on the low pressure side. The bush should be
replaced if there is any general scoring or fine scoring with a matt appearance or tearing of the
surface material. Often there is a witness where the tips of the opposing gears have wiped an
overlap reassembling a half moon shape. There must be no noticeable wear step as it is critical
that the bush side face is completely flat to the gear side face.
Θ The bearing liners are acceptable providing that they are not scored or show other damage.
The general outside area of the bush should not show any prominent signs of wear.
(5) Gears
Η The gear side faces should be examined for bruising or scoring. Often operation on
contaminated fluid shows scoring between the root of the gear and the journal undercut, which
leaves a wear step. If a wear step can be felt, coincidental with the root diameter, by drawing a
sharp pointed tool across the surface from the undercut outwards towards the tip of the gear,
then the gear is unserviceable.
Θ The gear teeth should then be carefully examined to ensure that there are no signs of bruising or
Ι pitting.
The journal bearing surfaces should be completely free from scoring or bruising. The surface
Κ should appear highly polished and smooth to touch.
Examine the area where the shaft seal lips run on the drive shaft, this shows up as a polished
Λ ring or rings. If a noticeable groove can be felt or there is scoring the shaft should be replaced.
Provided the drive shaft is not damaged from the drive-coupling and the gears have not been
harmed as described above, then the gears can be re-used. If, however, the gears are
Μ damaged they must be replaced as a matched pair.
As a matter of good practice, when pumps have been disassembled, all the seals should be
4-44
4) ASSEMBLY
17
16
2
3 11
13
14 15
23 18
22 19
21 18
7
18
1716 3 10
3
A 9 A
12
14
15 18
20
6
1 5
8
4
7707BS25
ö Ensure that all parts are perfectly clean and lightly lubricate the bushes and gears with hydraulic
oil(Ensure body O-ring recess and end faces remain free from oil). This will assist with their
assembly when they are later fitted into the body.
(1) Refit the bushing(7) into the undowelled end of the body(2) from where they were removed.
(2) Place the rear cover(21) against the body(2) and then stand the assembly on the cover so that the
hollow dowels are uppermost, i.e. the bushing should be at the bottom with the bushings against
the cover.
(3) Fit the drive shaft(10) and driven gear(11) back into their original positions in the body(2).
(4) Refit the plate bushing(13) into their original bores.
(5) Fit the new body O-ring(18).
(6) Fit the new seal element(14) and backing ring(15) to the bushing.
(7) Carefully refit the plate(19) to the body(2). If the plate(19) is not fitted squarely the backup
seal(14) may become misplaced and trapped, resulting in internal damage if the unit is run in this
condition.
4-45
ASSEMBLY
17
16
2
3 11
13
14 15
23 18
22 19
21 18
7
18
1716 3 10
3
A 9 A
12
14
15 18
20
6
1 5
8
4
7707BS25
4-46
5) RUNNING-IN
Pressure gauge
Flow
meter
Relief valve
Strainer
Tank
(730TM-3C) 4-48
(1) A unit which has been re-assembled with either new gears, bushes or body, must be carefully run-
in before it is subjected to full working conditions.
(2) Ideally this should be done on a test rig(See figure) where pressure can be gradually applied and
any wipings from the body cut-in arrested by filters.
(3) It is recommended that the unit is run-in at 1500rpm, initially, at zero pressure for one minute then
in stages with the pressure increased by 500psi every minute, until maximum rated pressure has
been attained. Frequently check the system temperature, ensuring that it does not exceed the
maximum permissible figure of 80ä C. If the temperature exceeds the system or unit specification
the test must be delayed and operated off-load until acceptable temperatures are obtained.
4-47
GROUP 2 OPERATIONAL CHECKS AND TROUBLESHOOTING
1. OPERATIONAL CHECKS
This procedure is designed so the service man can make a quick check of the steering system using
a minimum amount of diagnostic equipment. If you need additional information, prefer to structure
and function in group 1.
A location will be required which is level and has adequate space to complete the checks.
The engine and all other major components must be at operating temperature for some checks.
Locate system check in the left column and read completely, following this sequence from left to right.
Read each check completely before performing.
At the end of each check, if no problem is found(OK), that check is complete or an additional check is
needed. If problem is indicated(NOT OK), you will be give repair required and group location. If
verification is needed, you will be give next best source of information :
·Chapter 2 : Troubleshooting
·Group 3 : Tests and adjustments
5-15
※Hydraulic oil must be at operating temperature for these checks(Refer to page 6-50).
Item Description Service action
A
Turn steering wheel until frames are
at maximum right(A) and then NOT OK
left(B) positions. Go to next check.
B
LOOK : Frames must move
smoothly in both directions.
When steering wheel is stopped,
frames must stop.
FEEL : Excessive effort must not
be required to turn steering wheel.
NOTE : It is normal for steering to
drift from stops when steering
wheel is released.
5-16
2. TROUBLESHOOTING
※ Diagnose malfunction charts are arranged from most probable and simplest to verify, to least
likely, more difficult to verify. Remember the following steps when troubleshooting a problem :
Step 1. Operational check out procedure(See group 3 in section 1)
Step 2. Operational checks(In this group)
Step 3. Troubleshooting
Step 4. Tests and adjustments(See group 3)
No hydraulic functions Faulty or misadjusted pilot supply unit valve Do pilot supply unit test in group 3.
steering normal Stuck open system relief valve
Replace relief valve.
Locked safety valve
Unlock safety valve.
Plugged pilot line filter
Inspect and replace.
Failed hydraulic pump
Remove and inspect the pump.
Low secodary pressure of RCV
Check the pressure and replace if
necessary.
5-17
Problem Cause Remedy
Slow or hard steering Too much friction in the mechanical parts of Lubricate bearings and joints of steering
the machine column or repair if necessary.
Check steering column installation.
Cold oil Warm the hydraulic oil.
Low priority valve pressure setting Do priority valve pressure test in group 3.
Clean or replace cartridge in steering valve.
Worn hydraulic pump Do hydraulic pump performance check .
Sticking priority valve spool Remove and inspect.
Broken priority valve spring Remove and inspect.
Slow steering wheel Leakage in steering unit gerotor Do steering system leakage check.
movement will not cause
Worn steering unit gerotor Do steering leakage check.
any frame movement
Steering wheel can be Leakage in steering system Do steering system leakage check.
turned with frames
against steering stop
Steering wheel turns with Broken steering column or splined coupling Remove and inspect.
no resistance and causes
Lack of oil in steering unit Start engine and check steering operation.
no frame movement
Leakage in steering system Do steering system leakage test in group 3.
5-18
Problem Cause Remedy
Steering unit locks up Worn or damaged steering unit Repair or replace steering unit.
Abrupt steering wheel Improperly timed gerotor gear in steering Time gerotor gear.
oscillation unit
Vibration in steering High priority valve setting Do priority valve pressure test in group 3.
system or hoses jump
Neutral position of Steering column and steering unit out of Align the steering column with steering unit.
steering wheel cannot be line
obtained, i.e. there is a
Too little or no play between steering Adjust the play and, if necessary, shorten
tendency towards
column and steering unit input shaft the splines journal.
"motoring"
Pinching between inner and outer spools Contact the nearest service shop.
5-19
Problem Cause Remedy
"Motoring" effect. Leaf springs are stuck or broken and have Replace leaf springs.
The steering wheel can therefore reduced spring force
turn on its own.
Inner and outer spools pinch, possibly due Clean steering unit or contact the nearest
to dirt service shop.
Return pressure in connection with the Reduce return pressure.
reaction between differential cylinder and
steering unit too high
Oil is needed in the tank Fill with clean oil and bleed the system.
Steering cylinder worn Replace or repair cylinder.
Gear wheel set worn Replace gear wheel set.
Spacer across cardan shaft forgotten Install spacer.
5-20
Problem Cause Remedy
Steering wheel can be One or both shock valves are leaky or are Clean or replace defective of missing
turned slowly in one or missing in steering valve valves.
both directions without
the steered wheels
turning.
Steering is too slow and Insufficient oil supply to steering unit, pump Replace pump or increase number of
heavy when trying to turn defective or number of revolutions too low revolutions.
quickly.
Relief valve setting too low Adjust valve to correct setting.
Relief valve sticking owing to dirt Clean the valve.
Spool in priority valve sticking owing to dirt. Clean the valve, check that spool moves
easily without spring.
Too weak spring in priority valve Replace spring by a stronger.
"Kick back" in steering Fault in the system Contact authorized man or shop.
wheel from system. Kicks
from wheels.
5-21
Problem Cause Remedy
Heavy kick-back in Wrong setting of cardan shaft and gear- Correct setting as shown in service manual.
steering wheel in both wheel set
directions.
Turning the steering Hydraulic hoses for the steering cylinders Connect lines to correct ports.
wheel activates the have been switched around
steered wheels opposite.
Hard point when starting Spring force in priority valve too weak Replace spring by a stronger.
to turn the steering wheel
Oil is too thick(Cold) Let motor run until oil is warm.
Too little steering force Pump pressure too low Correct pump pressure.
(Possibly to one side
Too little steering cylinder Fit a larger cylinder.
only).
Piston rod area of the differential cylinder Fit cylinder with thinner piston rod or 2
too large compared with piston diameter differential cylinders.
5-22
GROUP 3 TESTS AND ADJUSTMENTS
5-23
5) Start the filter caddy. Check to be sure oil
is flowing through the filters.
Operate filter caddy approximately 10
minutes so oil in hydraulic oil tank is circulated
through filter a minimum of four times.
※ Hydraulic oil tank capacity 150 ℓ
(39.7U.S. gal).
Leave filter caddy operating for the next
steps.
6) Start the engine and run it at high idle.
※ For the most effective results, cleaning
procedure must start with the smallest
capacity circuit then proceed to the next
largest capacity circuit.
7) Operate all functions, one at a time, through
a complete cycle in the following order:
clam, steering, bucket, and boom. Also
include all auxiliary hydraulic functions.
Repeat procedure until the total system
capacity has circulated through filter caddy
seven times, approximately 30 minutes.
Each function must go through a minimum
of three complete cycles for a through
cleaning for oil.
※ Filtering time for machines with auxiliary
hydraulic functions must be increased
because system capacity is larger.
8) Stop the engine. Remove the filter caddy.
9) Install a new return filter element.
10) Check oil level in hydraulic oil tank ; Add oil
if necessary.
5-24
2. TEST TOOLS
1) CLAMP-ON ELECTRONIC TACHOMET-
ER INSTALLATION
· Service equipment and tools
Tachometer
A : Clamp on tachometer.
Remove paint using emery cloth and B
connect to a straight section of D
injection line within 100mm(4in) of C
pump. Finger tighten only-do not over
tighten.
B : Black clip(-). Connect to main frame. A
C : Red clip(+). Connect to transducer.
D : Tachometer readout. Install cable.
(770-3ATM) 5-30
(770-3ATM) 5-30
mph
7807A3CD03
5-25
3. STEERING SYSTEM RESTRICTION TEST
· SPECIFICATION
Oil temperature 45±5。 C(113±9。
F)
Engine speed High idle
Maximum pressure 2.1MPa(21bar,300psi)
at steering valve(EHPS)
· GAUGE AND TOOL
Gauge 0~7MPa(0~70bar, 0~1000psi) 2EA Steering pump
· This test will check for restrictions in the
steering system which can cause
overheating of hydraulic oil. Fitting
5-26
4. STEERING UNIT LEAKAGE TEST
· SPECIFICATION
Oil temperature 45±5。 C(113±9。
F)
Engine speed High idle
Maximum leakage 7.5ℓ/min(2gpm) Cap fitting
· GAUGE AND TOOL
T
Temperature reader L
R
Measuring container(Approx. 20ℓ)
Stop watch
1) Install frame locking bar to prevent machine
from turning.
2) Install temperature reader.
(See temperature reader installation
procedure in this group).
3) Heat hydraulic oil to specifications.
(See hydraulic oil warm up procedure at
page 6-50).
4) Disconnect return hose from fitting.
Install cap fitting.
5) Run engine at specifications. Rotate
steering wheel against locking bar using
approximately 1.2kgf·m of force.
Measure oil flow from return hose for 1
minute.
6) Leakage is greater than specifications, Safety lock bar
repair or replace steering unit.
7707ASE08
5-27
5. STEERING VALVE(EHPS) PRESSURE TEST
· SPECIFICATION
Oil temperature 45±5。 C(113±9。 F)
Engine speed High idle
Oil pressure 20.1~21.1MPa
(205~215bar, 2900~3100psi) Relief valve
· GAUGE AND TOOL
CL
Gauge 0~35MPa(0~350bar, 0~5000psi) CR
Temperature reader
1) Connect gauge to test port.
2) Install temperature reader(See installation
procedure in this group).
3) Install frame locking bar.
4) Heat hydraulic oil to specifications(See
hydraulic oil warm up procedure at page
6-50). Test port
5) Run engine at specifications and turn
steering wheel rapidly hold approximately
22N(5lb force) pressure on wheel with
frames locked.
※ If steering wheel is turned slowly, it will
continue to with the frames locked.
This will give an incorrect pressure
reading.
If steering wheel continues to turn rapidly
with the frames locked, steering system
leakage is indicated.
6) Read pressure gauge. This is the steering Safety lock bar
valve relief pressure.
7) If pressure in not to specification, turn
adjusting screw in relief cartridge using a
hex head wrench to adjust pressure.
If pressure cannot be adjusted to
specification, disassemble and inspect 7607ASE20
steering valve.
5-28
6. STEERING VALVE(EHPS) RELIEF
CARTRIDGE LEAKAGE TEST
· SPECIFICATION Relief valve
Oil temperature 45±5。 C(113±9。 F) A
Engine speed High idle
Maximum leakage 1mℓ/min(16 drops per min) T B
Ts
· GAUGE AND TOOL
Temperature reader
Measuring container
Stop watch
1) Install temperature reader.
(See temperature reader installation
procedure in this group).
2) Heat hydraulic oil to specifications.
(See hydraulic oil warm up procedure at
page 6-50).
3) Install plug(A) in Ts port.
Disconnect line from T port on steering
valve. Install plug in line.
4) Connect line(B) to steering valve.
5) Start engine and run at specification.
6) Measure oil leakage from T port.
7) If leakage is more than specification, 7607SE21
5-29
GROUP 4 DISASSEMBLY AND ASSEMBLY
1. STEERING UNIT
1) STRUCTURE
3 8
11
4
9
2
13
14
12
15
13
17
18
21
20
7607SE10
5-30
2) TOOLS
(1) Holding tool + Guide ring
7607SE08
7607SE09
(780-3A) 5-69(3)
(780-3A) 5-69(4)
5-31
(5) Assembly tool for dust seal.
(780-3A) 5-70(1)
5-32
3) TIGHTENING TORQUE AND HYDRAULIC CONNECTIONS
(1) Hydraulic connections
L: Left port
R: Right port
T: Tank
TLPR
P: Pump
(780-3A) 5-71
5-33
4) DISASSEMBLY
(1) Disassemble steering column from
steering unit and place the steering unit in
the holding tool.
Screw out the screws in the end cover(6-
off plus one special screw).
(780-3A) 5-72(1)
(780-3A) 5-72(2)
(780-3A) 5-72(3)
(780-3A) 5-72(4)
5-34
(5) Remove distributor plate.
(780-3A) 5-73(1)
(780-3A) 5-73(2)
(780-3A) 5-73(3)
(780-3A) 5-73(4)
5-35
(9) Take ring, bearing races and needle
bearing from sleeve and spool. The outer
(Thin) bearing race can sometimes "stick"
in the housing, therefore check that it has
come out.
(780-3A) 5-74(1)
(780-3A) 5-74(2)
(780-3A) 5-74(3)
(780-3A) 5-74(4)
5-36
(12) Press the neutral position springs out of
their slots in the spool.
(780-3A) 5-75(1)
(780-3A) 5-75(2)
(780-3A) 5-75(3)
※ Cleaning
Clean all parts carefully in Shellsol K or
the like.
※ Inspection and replacement
Replace all seals and washers. Check all
parts carefully and make any
replacements necessary.
※ Lubrication
Before assembly, lubricate all parts with
hydraulic oil.
5-37
(1) Place the two flat neutral position springs
in the slot.
Place the curved springs between the flat
ones and press them into place.
7607SE06
(780-3A) 5-76(4)
(780-3A) 5-76(1)
(780-3A) 5-77(2)
5-38
(5) Line up the springs and center them.
(780-3A) 5-77(3)
(780-3A) 5-77(4)
(780-3A) 5-78(1)
(780-3A) 5-78(2)
5-39
※ Assembly pattern for standard bearings
1
1 Outer bearing race
2
2 Needle bearing 3
3 Inner bearing race
4 Spool
5 Sleeve * 4
(780-3A) 5-78(4)
(780-3A) 5-79(1)
(780-3A) 5-79(2)
5-40
(11) Hold the outer part of the assembly tool in
the bottom of the steering unit housing
and guide the inner part of the tool right to
the bottom.
(780-3A) 5-79(3)
(780-3A) 5-79(4)
(780-3A) 5-80(1)
(780-3A) 5-80(2)
5-41
(780-3A) 5-80(3)
(780-3A) 5-80(4)
(780-3A) 5-81(1)
(780-3A) 5-81(2)
5-42
(18) The spool set will push out the assembly
tool guide. The O-ring are now in position.
(780-3A) 5-81(3)
(780-3A) 5-81(4)
(780-3A) 5-82(1)
(780-3A) 5-82(2)
5-43
(22) Place the distributor plate so that the
channel holes match the holes in the
housing.
(780-3A) 5-82(3)
(780-3A) 5-82(4)
(780-3A) 5-83(1)
(780-3A) 5-83(2)
5-44
(26) Important
Fit the gearwheel (Rotor) and cardan shaft
so that a tooth base in the rotor is
positioned in relation to the shaft slot as
shown.
Turn the gear rim so that the seven
through holes match the holes in the
housing.
(780-3A) 5-83(3)
(780-3A) 5-83(4)
(780-3A) 5-84(1)
(780-3A) 5-84(2)
5-45
(30) Fit the six screws with washers and insert
them. Cross-tighten all the screws and
the rolled pin.
·Tightening torque : 3.1±0.6kgf·m
(22.4±4.3lbf·ft)
(780-3A) 5-84(3)
(780-3A) 5-84(4)
(780-3A) 5-85(1)
(780-3A) 5-85(2)
5-46
2. STEERING CYLINDER
1) STRUCTURE
7607SE05
5-47
2) TOOLS AND TIGHTENING TORQUE
(1) Tools
Spanner 36
Torque
Part name Item Size
kgf·m lbf·ft
Gland 3 M85×3 75±8 542±58
Piston 13 M36×3 50±5 362±36
Piston nut 17 M36×3 75±8 542±58
Set screw 18 M10×1.5 5.4±0.5 39±3.6
5-48
3) DISASSEMBLY
(1) Remove cylinder head and piston rod
① Hold the clevis section of the tube in a
vise.
※ Use mouth pieces so as not to damage
the machined surface of the cylinder
tube. Do not make use of the outside
piping as a locking means.
2
(770-3ATM) 5-88(1)
3
2
(770-3ATM) 5-88(2)
5-49
※ Note that the plated surface of piston
rod(2) is to be lifted. For this reason, do
not use a wire sling and others that may
damage it, but use a strong cloth belt or a
rope.
Wooden block
(770-3ATM) 5-89(1)
7607SE22
5-50
(3) Disassemble the piston assembly
① Remove wear ring(16). 15 16
Remove piston seal(15).
※ Exercise care in this operation not to
damage the grooves.
7607SE23
5-51
4) ASSEMBLY
(1) Assemble gland assembly
※ Check for scratches or rough surfaces if
found smooth with an oil stone.
① Coat the inner face of gland(3) with
hydraulic oil.
3
(770-3ATM) 5-91(1)
(770-3ATM) 5-91(2)
(770-3ATM) 5-91(3)
(770-3ATM) 5-91(4)
5-52
⑤ Fit back up ring(11) to gland (3).
※ Put the backup ring in the warm water of 4
30~50° C.
11
⑥ Fit O-ring(10) to gland(3).
12
3
10
(770-3ATM) 5-92(1)
(770-3ATM) 5-92(2)
(770-3ATM) 5-92(3)
7607SE25
5-53
(3) Install piston and gland assembly
① Fix the piston rod assembly to the work Gland assembly
bench. Piston rod
② Apply hydraulic oil to the outer surface of
piston rod(2), the inner surface of piston
and gland.
③ Insert gland assembly to piston rod(2).
(770-3ATM) 5-93(1)
(770-3ATM) 5-93(2)
7607SE26
5-54
(4) Overall assemble
① Place a V-block on a rigid work bench. Fix with bar
Mount the cylinder tube assembly(1) on it Lift
and fix the assembly by passing a bar
through the clevis pin hole to lock the
assembly.
② Insert the piston rod assembly in to the Straight
cylinder tube assembly, while lifting and
moving the piston rod assembly with a Apply liquid packing
(770-3ATM) 5-94(1)
crane.
※ Be careful not to damage piston seal by
thread of cylinder tube.
③ Match the bolts holes in the cylinder
head flange to the tapped holes in the
cylinder tube assembly and tighten Tube
socket bolts to a specified torque.
Piston rod
※ Refer to the table of tightening torque.
Wrench
Gland
(770-3ATM) 5-94(2)
5-55
6. CENTER PIVOT PIN
1) CONSTRUCTION
Figure shows the construction of the center pivot pin assembly. This assembly serves to connect
the front frame with the rear frame; two sets of assemblies are provided, one each for the upper and
lower parts. The numbers in parentheses following the parts name denote the item numbers
shown in the figure in the disassembly and assembly procedures.
14,15 7 6 21
9
13 12
18
2
1
14,15 3,4 20
20 19
1
3,4
9 8
16,17
21 10 18 14,15
UPPER LOWER
7707SE13
5-56
2) DISASSEMBLY
After supporting the front frame and the
rear frame as horizontally as possible using
wood blocks and jacks, disassemble as
follows: In order to facilitate the
disassembly/assembly of the center pivot
pins, remove the drive shaft, hydraulic line
and steering cylinder first.
(1) Maintain the horizontal level of front
frame(20) and rear frame(21), and then
14
remove hexagon bolt(14) and plate(9). 9
21
10
7707SE14
5-57
(8) Remove bolt(14) and then take out
cover(2) and shims(3,4). 14 13 2
13
7707SE16
19 12 14
7707SE17
3) INSPECTION
(1) Check the bearing sliding surface for excessive wear, scorching or scratches; replace if necessary.
(2) Replace all dust seals(12,13) with new ones.
(3) Grind any pins(6, 10) dented with an oilstone or replace any pins abrasive excessively.
(4) Check inside cover(2, 19) and collar(7, 8) for dents or scratches; if any damage is found, correct
with a grinder or replace.
(5) The serviceable limit of pins and bushings is shown in the table below.
Unit : mm
5-58
4) ASSEMBLY
14,15 7 6 21
9
13 12
18
2
1
14,15 3,4 20
Clearance A
20 19
1
3,4
9 8
Clearance B 16,17
21 10 18 14,15
UPPER LOWER
7707ASE13
Assemble the center pivot group by reversing the order of disassembly while paying close attention
to the following.(Assembly position, see page 5-93)
(1) Put the dust seal(12,13) into cover(2, 19) and front frame(20).
※ Apply grease to the lip of the dust seal. Insert the dust seal so that the dust seal lip faces out and
punch four places on the outer circumference of the seal to lock it.
(2) Lower the temperature of the lower bearing cup to -75±5。C (-103±9。F ) and install it to front
frame until it contacts the bottom of the frame.
(3) Coat lightly with oil and install lower bearing in bore in front frame. Coat lightly with oil and install
upper bearing in bore in upper front frame.
(4) Position the cover(2, 19) and hold in place with bolt(14). At this time, adjust shims(3,4) to press
the shoulder of bearing(1) against retainer.
ㆍ Adjustment method of clearance A
① Install bearing and cover without shim(3, 4)
Install four of bolt(14) so that each bolt is seperated by 90 degrees.
ㆍTightenig torque : 1.5~1.7kgfㆍm(10.8~12.3lbfㆍft)
② Adjust shims in order to control the clearance A.
ㆍClearance A : Below 0.1mm
ㆍShim thickness : 0.1mm, 0.5mm
5-59
(5) Apply grease to lower collar(8) and insert it to the lower of roller bearing.
(6) After setting the bearing so that its upper surface is horizontal, tighten the all the bolt(14).
After tightening, confirm that tapered roller bearing moves lightly ; if does not move smoothly, add
shims(3,4).
ㆍ Tightening Torque : 25.4~34.2kgfㆍm(184~247lbfㆍft)
ㆍ Apply loctite #243.
(7) Move the front frame and join it to the rear frame so that match the pin hole at the center.
(8) Apply grease to pin(10), bushing(18) and insert it into tapered roller bearing(1).
(9) Apply grease to lower collar(8) and insert it to the lower of roller bearing through rear frame(21).
(10) Apply grease to pin(6) and insert it into tapered roller bearing(1).
(11) Before tightening bolt(14), adjust shims(16,17) in order to control the clearance between the
plate(9) and rear frame(21).
ㆍAdjustment method of clearance B
① Install pin(6) and plate(9) without shim(16, 17).
Install four of bolt(14) so that each bolt is seperated by 90 degrees.
ㆍTighting torque : 1.5~1.7kgfㆍm(10.8~12.3lbfㆍ ㆍft)
② Adjust shims in order to control the clearance B.
ㆍClearance B : 0.1~0.2mm
ㆍShim thickness : 0.1mm, 0.5mm
(12) Tighten the all the bolts(14).
ㆍTightening Torque : 25.4~34.2kgfㆍ
ㆍm(184~247lbfㆍft)
ㆍApply loctite #243.
5) TROUBLESHOOTING
Shock is felt when steering Capscrew for fixing steering valve is loose Retighten
Faulty center pivot pin mounting bolts Retighten
Center pivot pins have worn out Readjust or replace
Faulty hydraulic system See hydraulic system
Shock is felt when moving Fault fixing of connecting capscrews Retighten
backward or forward
Center pins have worn out Readjust or replace
Bearings of support unit have worn out Retighten
Drive shaft damaged See drive system
Faulty transmission See transmission system
5-60
SECTION 6 WORK EQUIPMENT
6-1
2. HYDRAULIC CIRCUIT
11 12 34 T X2
MX
10 250bar
LH RH
33
FRONT REAR LH RH
7 B A
4 T P
18 B.D/F B.U IN OUT
21 6 CL CR
BL1 BR1 BL2 BR2
9
35 1 3 4 2 1.1 2.1
L
T1 P1 T2 P2
R 3 T
B3
A3 Boom up Boom down
b3
a3
16 16 Ps
21MPa
15 B
B2
Ts Roll back Dump
8 B1 A1 B2 A2
A2
b2
A
17 EF P LS T
a2
A3 5 L R
19 F2
PS T1 B1 14
A1 Aux
B b1
a1 F1
PS1
21MPa
20 13 U
P T
P
P T
22 T
3MPa
P1
P2
2 1
32 25
30 M1
A
P1
31 M2 26
T P
P2
27 28
29 24 23
M
C
7607AWE01
6-2
3. WORK EQUIPMENT HYDRAULIC CIRCUIT
11 12
4 T P
1 3 4 2 1.1 2.1
3 T
B3
A3 Boom up Boom down
b3
a3
15 B
B2
A2 Roll back Dump
A
b2
a2
F2
B1 14
A1 Aux
b1
a1 F1
21MPa
13 U
T
Steering valve(EHPS) EF port
3MPa
P1
Steering system P2
Brake system
Return line
1
25
26 24
T P
27 28
7607WE02
6-3
1) WHEN THE RCV LEVER IS IN THE RAISE POSITION
11 12
4 T P
B.D/F B.U IN OUT
LH RH
1 3 4 2 1.1 2.1
3 T
B3
A3 Boom up Boom down
b3
a3
15 B
B2
A2 Roll back Dump
A
b2
a2
F2
B1 14
A1 Aux
b1
a1 F1
21MPa
13 U
T
Steering valve(EHPS) EF port
3MPa
P1
Steering system P2
Brake system
Return line
1
25
26 24
T P
27 28
7607WE03
· When the RCV lever(4) is pulled back, the boom spool is moved to raise position by pilot oil
pressure from port 3 of RCV.
· The oil from main pump(1) flows into main control valve(3) and then goes to the large chamber of
boom cylinder (12) by pushing the load check valve of the boom spool through center bypass circuit
of the bucket spool.
· The oil from the small chamber of boom cylinder(12) returns to hydraulic oil tank(26) through the
boom spool at the same time.
· When this happens, the boom goes up.
6-4
2) WHEN THE RCV LEVER IS IN THE LOWER POSITION
11 12
4 T P
1 3 4 2 1.1 2.1
Make up valve
3 T
B3
A3 Boom up Boom down
b3
a3
15 B
B2
A2 Roll back Dump
A
b2
a2
F2
B1 14
A1 Aux
b1
a1 F1
21MPa
13 U
T
Steering valve(EHPS) EF port
3MPa
P1
Steering system P2
Brake system
Return line
1
25
26
T P
27 28
24
C
7607WE04
· When the RCV lever(4) is pushed forward, the boom spool is moved to lower position by pilot
pressure.
· The oil from main pump(1) flows into main control valve(3) and then goes to small chamber of
boom cylinder(12) by pushing the load check valve of the boom spool through center bypass circuit
of the bucket spool.
· The oil returned from large chamber of boom cylinder(12) returns to hydraulic tank(26) through the
boom spool at the same time.
· When the lowering speed of boom is faster, the return oil from the large chamber of boom cylinder
combines with the oil from the pump through the make up valve, and flows into the small chamber
of the cylinder.
This prevents cylinder cavitation by the negative pressure when the pump flow cannot match the
boom down speed.
6-5
3) WHEN THE RCV LEVER IS IN THE FLOAT POSITION
11 12
4 T P
1 3 4 2 1.1 2.1
3 T
B3
A3 Boom up Floating
b3
a3 Boom
down
15 B
B2
A2 Roll back Dump
A
b2
a2
F2
B1 14
A1 Aux
b1
a1 F1
21MPa
13 U
T
Steering valve(EHPS) EF port
3MPa
P1
Steering system P2
Brake system
Return line
1
25
26
T P
27 28
24
7607WE05
· When the RCV lever(4) is pushed further forward from the lower position, the pitot pressure reaches
to 13~15bar, then the boom spool is moved to floating position.
· The work ports(A3), (B3) and the small chamber and the large chamber are connected to the
return passage, so the boom will be lowered due to it's own weight.
· In this condition, when the bucket is in contact with the ground, it can be move up and down in
accordance with the shape of the ground.
6-6
4) WHEN THE RCV LEVER IS IN THE DUMP POSITION
11 12
4 T P
1 3 4 2 1.1 2.1
3 T
B3
A3 Boom up Boom down
b3
a3
15 B
B2
A2 Roll back Dump
A
b2
a2
F2
B1 14
A1 Aux
b1
a1 F1
21MPa
13 U
T
Steering valve(EHPS) EF port
3MPa
P1
Steering system P2
Brake system
Return line
1
25
26 24
T P
27 28
C
7607WE06
· If the RCV lever(4) is pushed right, the bucket spool is moved to dump position by pilot oil pressure
from port 2 of RCV.
· The oil from main pump(1) flows into main control valve(3) and then goes to the small chamber of
bucket cylinder(11) by pushing the load check valve of the bucket spool.
· The oil at the large chamber of bucket cylinder(11) returns to hydraulic tank(26) through the bucket
spool.
· When this happens, the bucket is dumped.
· When the dumping speed of bucket is faster, the oil returned from the large chamber of bucket
cylinder combines with the oil from the pump, and flows into the small chamber of the cylinder.
This prevents cylinder cavitation by the negative pressure when the pump flow cannot match the
bucket dump speed.
6-7
5) WHEN THE RCV LEVER IS IN THE ROLL BACK(retract) POSITION
11 12
4 T P
1 3 4 2 1.1 2.1
3 T
B3
A3 Boom up Boom down
b3
a3
15 B
B2
A2 Roll back Dump
A
b2
a2
F2
B1 14
A1 Aux
b1
a1 F1
21MPa
13 U
T
Steering valve(EHPS) EF port
3MPa
P1
Steering system P2
Brake system
Return line
1
25
26 24
T P
27 28
7607WE07
· If the RCV lever(4) is pulled left, the bucket spool is moved to roll back position by pilot oil pressure
from port 4 of RCV.
· The oil from main pump(1) flows into main control valve(3) and then goes to the large chamber of
bucket cylinder by pushing the load check valve of the bucket spool.
· The oil at the chamber of bucket cylinder(11) returns to hydraulic tank(26) through the bucket spool.
· When this happens, the bucket roll back.
· When the rolling speed of bucket is faster, the return oil from the small chamber of bucket cylinder
combines with the oil from the pump, and flows into the large chamber of the cylinder.
This prevents cylinder cavitation by the negative pressure when the pump flow cannot match the
bucket rolling speed.
6-8
6) WHEN THE RCV LEVER IS IN THE HOLD POSITION
11 12
4 T P
1 3 4 2 1.1 2.1
3 T
B3
A3 Boom up Boom down
b3
a3
15 B
B2
A2 Roll back Dump
A
b2
a2
F2
B1 14
A1 Aux
b1
a1 F1
21MPa
13 U
T
Steering valve(EHPS) EF port
3MPa
P1
Steering system P2
Brake system
Return line
1
25
26 24
T P
27 28
7607WE08
· The oil from main pump(1) flows into main control valve(3).
· In this time, the bucket spool, the boom spool and the boom float spool are in neutral position, then
the oil supplied to main control valve(3) returns into hydraulic tank(26) through center bypass circuit
of each spool.
· In this condition, each cylinder keeps the neutral position, so the boom and the bucket is holded.
6-9
4. MAIN PUMP
1) STRUCTURE
21
20
4
3 5
23
13
11 12
22
19
15
8
7 14
6
17
18
9
16
8 15
7 14
6 13
12
11
10
1
2
7607WE33
6-10
2) OPERATION
The main hydraulic pump is a fixed displacement gear type pump. The pump is drive at engine
speed by the transmission. The pump shafts are supported by shaft seal(1) adapter(2), front
body(16) and rear body(22). The wearplate(8, 11) are located between the gear surface and
adapter(1), rear body(22) and front body(16).
As the drive gear(9) and (19) turns the idler gears(10, 18), the gear teeth come out of mesh. Oil
flows from the hydraulic tank through the inlet into the cavity between the gear teeth. As the gears
continue to rotate, the oil becomes trapped between the gear teeth and front body(16).
The trapped oil is then carried to the pump outlet. Oil is forced out the outlet to supply the hydraulic
function. As the gears re-mesh, they form a seal to prevent oil from flowing between the gears and
back to the inlet.
The pump uses outlet pressure oil to load the wearplate(8, 11) against the gear faces. This
controls internal leakage to maintain pump displacement.
Outlet pressure fills the area bounded by the pressure balance moulded seals(6, 7) to force the
wearplate against the high pressure area or the gear faces.
6-11
5. REMOTE CONTROL VALVE
1) STRUCTURE
4,3,1
4 1
10 3 2 12
30
11
2
33 30
4,3,1 14 32
40
15
40
4 1 42
20 3 2
22
21
23 4 1
3 2
25
26
45
7707WE11
6-12
2) OPERATION
T P
1 34 2
HYDRAULIC CIRCUIT
(3 Electromagnetic locks)
Electromagnetic lock 9
10
11 5
4
12
(1) Hydraulic functional principle 3
Pilot devices with end position locks operate as 2
7
direct operated pressure reducing valves.
They basically comprise of control lever(1), four T 8
x
pressure reducing valves, housing(6) and locks. P
6-13
(2) End position lock
Only those control ports, for which it is necessary to hold the control lever in a deflected position
are equipped with end position locks.
Electromagnetic lock
An additional spring(7), which is fitted below an additional plate(12) warns, by means of an
increased force, which is required for compressing this spring, that the plunger(5) and the control
lever(1) have almost reached their end position.
When this threshold is overcome, a ring(10) contacts the solenoid armature(11); if the solenoid is
energized, then control lever(1) is held in its end position by magnetic force.
This lock is released automatically when the solenoid is deenergized.
6-14
6. MAIN CONTROL VALVE
1) STRUCTURE
8
9
10
3
32
33
11 34 24 37
22 23
35 23 22
7 17 24
20 21
17 36
19
11 18 24
17 12 23
2 22
16
5
1
4
12
12
13
14
15
6 21
11 98
26 13
28
14
25 12 15
27 39
29 38
40 11
7607WE09
6-15
STRUCTURE
a3 A3 B3 b3
a2 A2 B2 b2
a1 A1 B1 b1
B3
A3 Boom up Boom down
b3
a3
B2
A2 Roll back Dump
b2
a2
B1
A1 Aux
b1
a1
21MPa
P
Hydraulic circuit
7607WE10
6-16
2) BOOM SECTION OPERATION
(1) Spool in neutral
T
LH RH
B3
A3 Boom up Boom down
b3
a3
B2
A2 Roll back Dump
b2
a2
T
Center bypass passage Tank passage
a3 Boom b3
7607WE11
When the boom plunger is in neutral position, oil from the pump flows to the tank through the center
bypass line.
The cylinder port(A3, B3) are shut off from the high pressure feed passage and tank passage by
the boom plunger.
6-17
(2) Boom raise position
T
LH RH
B3
A3 Boom up
b3
a3 Load
check
valve
B2
A2 Roll back Dump
b2
a2
a3 b3
7607WE12
When the pilot pressure is led to the port(a3), the boom plunger is switched, and shut off center
bypass passage.
Oil from the pump flows to the cylinder port(A3) through the load check valve and oil from the
cylinder flows into the tank passage through the cylinder port(B3).
※ Load check valve
When the load pressure is higher than the pump pressure, the load check shuts off the passage
between the high pressure feed passage and the center bypass passage and prevents the reverse
flow from the cylinder.
6-18
(3) Boom lower position
T
LH RH
B3
A3 Boom down
b3
a3 Load
check
valve
B2
A2 Roll back Dump
b2
a2
a3 b3
7607WE13
When the pilot pressure is led to the port(b3), the boom plunger is switched, and shut off center
bypass passage. Oil from the pump flows to the cylinder port(B3), through the load check valve
and oil from the cylinder flows into the tank passage through the cylinder port(A3).
6-19
(4) Boom float position
T
LH RH
B3
A3 Boom float
b3
a3
B2
A2 Roll back Dump
b2
a2
Tank passage
Center bypass passage
7607WE14
When the boom plunger is located in float position, the oil from the pump flows to the tank through
the center bypass line.
The cylinder port(A3) is connected to the tank passage, and the cylinder port(B3) is connected to
the tank passage, and the cylinder port(B3) is connected to the tank passage through the bridge
line. And then the both cylinder port is in float condition.
6-20
3) BUCKET SECTION OPERATION
(1) Spool in neutral
B3
A3 Boom up Boom down
b3
a3
B2
A2 Roll back Dump
b2
a2
T
Center bypass passage Tank passage
a2 Bucket b2
7607WE15
When the bucket plunger is in neutral position, oil from the pump flows to the tank through the
center bypass line.
To cylinder port(A2, B2) are shut off from the high pressure feed passage and tank passage by the
bucket plunger.
6-21
(2) Bucket rollback position
B3
A3 Boom up Boom down
b3
a3
B2
A2 Roll back
b2
a2 Load
check
valve
a2 b2
7607WE16
When the pilot pressure is led to the port(a2), the bucket plunger is switched, and shut off center
bypass passage.
Oil from the pump flows to the cylinder port(A2) through the load check valve and oil from the
cylinder flows into the tank passage through the cylinder port(B2).
※ Load check valve
When the load pressure is higher than the pump pressure, the load check shuts off the passage
between the high pressure feed passage and the center bypass passage and prevents the reverse
flow from the cylinder.
6-22
(3) Bucket dump position
B3
A3 Boom up Boom down
b3
a3
B2
A2 Dump
b2
a2
a2 b2
7607WE17
When the pilot pressure is led to the port(b2), the bucket plunger is switched, and shut off center
bypass passage.
Oil from the pump flows to the cylinder port(B2) through the load check valve and oil from the
cylinder flows into the tank passage through the cylinder port(A2).
6-23
4) MAIN RELIEF VALVE
Main poppet(A)
· The relief valve is installed between pump Pilot poppet(B) d1
circuit and tank circuit in the main control Spring(C) d2
valve housing and keeps system pressure
to setting pressure.
P
· Oil from the pump port(P) enters into the
chamber(3) through the orifice(2) of the
main poppet(A). T
As d2<d1, main poppet(A) is securely 4 3 2 1
seated.
T
4
7607WE18
6-24
5) PORT RELIEF VALVE
The port relief valve is installed between
cylinder port and tank passage.
Main poppet(B) Pilot poppet(D)
It protects the actuator from abnormal Piston(A) Spring(C)
d2 d1
pressure, due to outer force or sudden
block of cylinder pressure.
Cylinder
The port relief valve is the type of built-in port
make-up function.
1 2 T 3 Circular 4
passage
7607WE19
T Circular 4
passage
7607WE20
6-25
③ Oil from the cylinder port flows to the tank Main poppet(B) Pilot poppet(D)
passage. As the pressure of the d1
d2
chamber(3) comes to lower still more, the
main poppet(B) is lifted and pressured oil
Cylinder
flows into the tank possage. port
1 T 3
7607WE22
6) MAKE UP VALVE
The make-up valve is installed between the
cylinder port and the tank passage. When
Main poppet(A)
the cylinder port pressure comes to lower d1
d2
than the tank passage pressure, then
make-up valve supplies the oil to the
Cylinder
cylinder port from the tank passage, and port
prevents cavitation.
(1) As the cylinder port pressure is normally
higher than the tank passage pressure T
and d2<d1, the poppet(A) is securely
seated. 7607WE24
6-26
(2) When the cylinder port pressure comes to
lower than the tank passage pressure Main poppet(A)
d1
(closer to negative pressure), the poppet d2
(A) opens receiving the tank passage
pressure for the difference in area Cylinder
port
between d2 and d1. Oil from the tank
passage flows to the cylinder port in order
to prevent cavitation.
T
7607WE25
6-27
7. PILOT OIL SUPPLY UNIT
1) STRUCTURE
5
1
P
2
U
T
6
P2 2
PILOT SUPPLY UNIT
(2) OPERATION
The pilot supply manifold reduces the pressure from the high pressure circuit to a low pressure
circuit in order to supply the remote control valve.
The accumulator satisfies short term peak power demands and is a source of emergency power
in case of main circuit pressure failures.
The unit consists of the housing, the accumulator(4), the relief valve(6), the check valve and the
reducing valve(2).
The flow path is from the high pressure circuit through port P2 to the pressure reducing valve(2).
The pressure is reduced in the reducing valve(2) and oil passes the check valve into the
accumulator(4) and to the port U, which is connected with the remote control valve.
The pressure relief valve(6) protects the pilot circuit in case of the reducing valve(2) failures or
external increase of pressure.
6-28
8. BOOM AND BUCKET CYLINDER
The boom cylinders are two unit and the bucket cylinder is one unit. They use a bolt on rod guide.
The piston(12) threads on to the rod(2) and is retained by a nut(16) and set screw(17).
The piston seals against the tube(1) with piston seal(14). Two wear rings(15) are located on each
side of the piston seal.
The gland(3, the rod guide) seals against the tube with an O-ring(10). The cylinder thread seals
against the rod with a lip type buffer ring(7) and a rod seal(5). A dust wiper(8) cleans the rod when it
is retracted.
1) BOOM CYLINDER
18 1 26,27
7607WE26
6-29
2) BUCKET CYLINDER
24,25 18 20 1 21 22 23
7607WE27
6-30
9. HYDRAULIC OIL TANK
1) STRUCTURE
· The oil from the hydraulic tank is sent from the pump through main control valve to the cylinders.
In the return circuit, the oil from various parts merges.
· A part of oil is cooled in the oil cooler, passes through the hydraulic filter and returns to the
hydraulic tank(1).
· If the hydraulic return oil filter becomes clogged, return filter bypass valve(6) acts to allow the oil to
return directly to the hydraulic tank(1). This prevents damage to the hydraulic filter(5). The
bypass valve(6) is also actuated when negative pressure is generated in the circuit.
15 11,13 4 9
7
3
A
6
5
SECTION A - A
2,8
12,14 15 10
7607WE28
6-31
2) RETURN OIL FILTER BYPASS VALVE
(1) When the filter is clogged
Bypass valve(1) is opened and the oil
returns directly to the tank without passing 1
through the filter.
·Bypass valve set pressure : 1.36kg/cm2
(19.3psi)
From MCV
770-3ATM (6-33)
6-32
3) AIR BREATHER
The air breather is equipped with the
capacity to perform three functions
simultaneously-as an air filter, breathing
valve, and as a lubrication opening.
(1) Preventing negative pressure inside the Element
Body
tank Socket bolt
The tank is a pressurized sealed type, so
negative pressure is formed inside the
hydraulic tank when the oil level drops
during operations. When this happens,
the difference in pressure between the
tank and the outside atmospheric
pressure opens the poppet in the
breather, and air from the outside is let
into the tank or prevent negative pressure.
(2) Preventing excessive pressure inside
the tank
When the hydraulic cylinder is being used,
the oil level in the hydraulic system
increases and as temperature rises. If
the hydraulic pressure rises above the set
pressure, breather is actuated to release
the hydraulic pressure inside the tank. 7607WE59
6-33
10. ACCUMULATOR
The accumulator is installed at the pilot oil
supply unit. When the boom is left the raised
position, and the control levers are operated
with the engine stopped the pressure of the
compressed nitrogen gas inside the
accumulator sends pilot pressure to the
1
control valve to actuate it and allow the boom
2
and bucket to come down under their own
3
weight.
Type of gas Nitrogen gas(N2)
Volume of gas 0.75ℓ(0.2 U.S.gal)
Charging pressure of gas 16kg/cm2(228psi)
Max actuating pressure 128kg/cm2(1820psi)
1 Diaphragm
2 Steel pressure vessel
3 Closure button
7803AWE56
6-34
GROUP 2 OPERATIONAL CHECKS AND TROUBLESHOOTING
1. OPERATIONAL CHECKS
This procedure is designed so the mechanic can make a quick check of the system using a minimum
amount of diagnostic equipment. If you need additional information, read structure and function,
Group 1.
A location will be required which is level and has adequate space to complete the checks.
The engine and all other major components must be at operating temperature for some checks.
Locate system check in the left column and read completely, following the sequence from left to right.
Read each check completely before performing.
At the end of each check, if no problem is found(OK), that check is complete or an additional check is
needed. If problem is indicated(NOT OK), you will be given repair required and group location.
If verification is needed, you will be given next best source of information:
·Chapter 2 : Troubleshooting
·Group 3 : Tests and adjustments
6-35
※ Hydraulic oil must be at operating temperature for these checks(Refer to page 6-50).
Item Description Service action
Hydraulic system warm- Hold a hydraulic function over OK
up procedure relief to heat oil.(Don't keep relief Check completed.
condition over 5 seconds at a
Run engine at high idle.
time)
Refer to page 6-50.
Periodically cycle all hydraulic
functions to distribute warm oil.
Repeat procedure until oil is at
operating temperature.
FEEL : Hydraulic reservoir must
be uncomfortable to hold your
hand against.
(approximately 40 ~50。
C)
Hydraulic pump With bucket flat on ground, OK
performance check actuate boom raise. Time how Check completed.
Heat hydraulic oil to long it takes to raise boom to full
NOT OK
operating temperature. height.
Go to priority valve(in
Run engine at high idle.
LOOK : Boom must raise to full steering valve) high pressure
height in less than 7 seconds. check at page 5-28.
IF OK
Do steering system
leakage check at page
5-29.
IF OK
Do main hydraulic pump
flow test at page 6-51.
Control valve lift check With bucket partially dumped, OK
Run machine at low idle. lower boom to raise front of Check complete.
machine.
NOT OK
Slowly move boom control Repair lift checks in
lever(RCV lever) to boom lower loader control valve.
position.
Slowly move bucket control lever
to bucket dump position.
LOOK : Boom must not raise
before moving down.
Bucket must not rollback before
dumping.
6-36
Item Description Service action
Bucket rollback circuit Position bucket at a 45。angle OK
relief valve check against an immovable object. Check complete.
Engage transmission in 3rd speed NOT OK
forward. Replace boom lower
check valve.
LOOK : Bucket angle must not
change.
Bucket dump circuit Raise front of machine which OK
relief valve low pressure bucket at 45。angle. Go to next check.
check
Backdrag with bucket while NOT OK
observing bucket angle. Do loader system and
circuit relief valve test at
LOOK : Bucket must not rollback
page 6-52.
Pilot control valve float With the bucket partially dumped, OK
check lower boom to raise front of Check complete.
machine.
Run engine at low idle. NOT OK
Push control lever to the float
Do pilot control valve
detent position and release lever.
pressure test in group 3.
LOOK : Front of machine lower to
the ground and valve must remain
in float position when lever is
released.
Boom cylinder and Set the boom and bucket OK
bucket cylinder drift horizontal, then stop the engine. Check complete.
check
Stop the engine, wait for 5 NOT OK
Heat hydraulic oil to minutes, then start measuring. Go to next check.
operating temperature.
B
Measure the amount the lift and
dump cylinder rods retract during
15 minutes.(Unloaded bucket)
A A : Retraction of boom cylinder
rod
B : Retraction of bucket cylinder
rod
Boom cylinder must drift less than
40mm
Bucket cylinder must drift less
than 50mm
6-37
Item Description Service action
Boom cylinder leakage Dump bucket until teeth or cutting OK
check edge is perpendicular to the Drift is approximately the
ground. same between first and
Heat hydraulic oil to
second measurement.
operating temperature. Raise boom until cutting edge is
about 1m(3ft) above ground.
Repair loader control
Stop engine. Measure drift from valve or circuit relief valve.
tooth or cutting edge to ground for
1 minute. NOT OK
If drift is considerably less
Wait 10 minutes.
on second measurement,
Measure drift from tooth or cutting repair cylinder.
edge to ground for 1 minute.
LOOK : Compare the drift rate
between the first measurement
and the second measurement.
Bucket cylinder leakage Raise bucket about 1m(3ft) off OK
check ground with bucket level. Drift is approximately the
same between first and
Heat hydraulic oil to Stop engine. Place a support
second measurement.
operating temperature. under boom.
Measure drift from tooth or cutting Repair loader control
edge to ground for 1 minute. valve or circuit relief valve
at page 6-52.
Wait 10 minutes.
Measure drift from tooth or cutting NOT OK
edge to ground for 1 minute. Drift is considerably less
on second measurement.
LOOK : Compare the drift rates
between the first measurement
Repair cylinder.
and the second measurement.
Check valve of safety Put bucket level and position
valve leakage check about 1.2m(4ft) above ground. OK
Check complete.
Heat hydraulic oil to Place a piece of tape on cylinder
operating temperature. rod at least 51mm(2in) from rod
NOT OK
guide.
Check or replace safety
Run engine at low idle in safety-
valve.
release position.
LOOK : Bucket must not drift up.
Pilot control valve Stop engine. Turn key switch to
OFF position.
(RCV lever) check OK
Move control lever to all positions Check completed.
and then release.
NOT OK
LOOK : Lever must return to
Repair pilot control valve.
neutral when released from all
positions.
6-38
Item Description Service action
Bucket leveler Position bucket fully dumped just OK
(Positioner) check above ground level. Check complete.
Run engine at low idle. Move control lever to bucket NOT OK
leveler detent position and Do bucket leveler checks
release. in group 3.
LOOK : Bucket must rollback to
the level position and control lever
must return to neutral.
If bucket is in a rolled back
position when key is turned ON,
control lever must be returned to
neutral manually if placed in the
bucket leveler detent position.
After bucket is dumped once,
bucket leveler will work normally.
Boom height kickout Position bucket flat on ground. OK
check Check complete.
Move control lever to boom raise
Run engine at low idle. detent position and release. NOT OK
Do boom height kickout
LOOK : Boom must raise to the
check in group 3.
set height and stop.
Control lever must return to
neutral.
Cycle time check Function Operating condition. Maximum cycle time
Heat hydraulic oil to Boom raise Bucket flat on ground to full height. 6.7sec
operating temperature.
Boom lower(Float) Full height to level ground. 3.5sec
Run engine at high idle.
Bucket dump Boom at full height. 1.7sec
Bucket rollback Boom at full height. 2.4sec
Steering(No. of Frame stop to frame stop. 2.7sec(4 turns)
turns)
OK
Check complete.
NOT OK
Go to slow hydraulic
functions in group 3.
6-39
※ MEASURING BOOM AND BUCKET CYCLE TIME
1. MEASUREMENT CONDITION
·Coolant temperature : Inside operating range
·Steering position : Neutral
·Hydraulic temperature : 40~50。 C
·Bucket : Unloaded
·Engine speed : High idling
2. MEASURING TOOL
· Stop watch(1EA)
3. MEASURING PROCEDURE
1) LIFTING TIME OF BOOM Lifting time of boom
Set the bucket near the maximum tilt back
position and at the lowest position on the
ground. Raise the bucket and measure the
time taken for bucket to reach the maximum
height of the boom.
7707AWE16
7707AWE17
6-40
2. TROUBLESHOOTING
※ Diagnose malfunction charts are arranged from most probable and simplest to verify, to least
likely, more difficult to verify. Remember the following steps when troubleshooting a problem :
6-41
Item Cause Remedy
No hydraulic functions Failed hydraulic pump Remove and inspect return filter for
steering normal metal pump particles, or replace the
pump.
Failed line filter Remove and inspect line filter for RCV.
Faulty safety valve Safety valve leakage test or ON, OFF
function test.
Stuck open port relief valve Replace relief valve.
Boom float function Low pilot control pressure Do pressure reducing valve pressure
does not work test in group 3.
Faulty pilot control valve(RCV) Replace relief valve.
Loader control valve(MCV) spool Do pressure reducing valve pressure
binding in bore test in group 3.
One hydraulic function Faulty pilot control valve(RCV) Do pilot control valve pressure test.
does not work. Inspect and repair valve.
Low hydraulic power Leakage within work circuit Do cylinder drift check in group 2.
Low system relief valve(main relief Do loader system and port relief valve
valve) setting pressure test in group 3.
Low port relief valve setting Do loader system and port relief valve
pressure test in group 3.
Faulty or misadjusted pilot oil supply Do pilot oil supply unit pressure test in
unit group 3.
Leaking system relief valve Remove and inspect valve.
Worn hydraulic pump Do hydraulic pump performance check
in group 2.
Faulty pilot control valve(RCV) Do pilot control valve pressure test in
group 3.
6-42
Item Cause Remedy
Boom drifts up Leakage in boom down spool Remove and inspect boom down spool.
Boom down does not Safety valve not operated Operate valve.
work(Engine off)
Stuck pilot control valve Inspect.
Faulty line filter Remove and inspect filter.
Accumulation not operated. Inspect.
MCV spool stuck Inspect and repair valve.
Oil overheats Low oil viscosity in hot weather Use recommended oil.
Excessive load Reduce load.
Holding hydraulic system over relief Reduce load.
Leakage in work circuit Do boom and bucket cylinder leakage
test in group 3.
Plugged fins in oil cooler Inspect and clean oil cooler.
Internally plugged oil cooler Do hydraulic oil cooler restriction test in
group 3.
Incorrect system or circuit relief valve Do loader system and circuit relief valve
setting pressure test in group 3.
Restriction in oil lines or loader control Inspect for dented or kinked lines.
valve(MCV) Do hydraulic system restriction test in
group 3.
Function drops before Stuck open lift check valve Do control valve lift check in group 2.
raising when valve is
activated
6-43
Problem Cause Remedy
Remote control valve Leaking plunger seals Remove, inspect and replace plunger
(RCV) leaking seals.
※ Followings are general precautions for the hydraulic system and equipment.
1) Every structure has its limit of strength and durability. The relief valve is installed to limit the
pressure on the hydraulic equipment and protect various parts of the wheel loader from possible
damage. Therefore, never change the preset pressure of the relief valve unless absolutely
necessary.
2) Since the hydraulic equipment is built with precision, the presence of only the slightest amount of
dust and / or other particles in the hydraulic circuit might cause wear and/or damage, resulting in
unstable functions and/or damage, resulting in unstable functions and/or unexpected accidents.
Therefore, always keep hydraulic oil clean. Periodically, check the filter in the return circuit and
replace the element as necessary.
3) Extract about 200cc of hydraulic oil from the tank as a sample every 6 months. If possible, have it
analyzed by a specialist to confirm that the oil can still be used. Never extract the oil for sampling
until the oil temperature has become the normal operating temperature. Since the replacement
period varies depending on operating conditions, refer to Operator's Manual and change oil.
4) Should the equipment get damaged due to the presence of metal particles and/or foreign matter in
the circuit drain out the hydraulic oil and carry out flushing. Also, replace the filter element and
clean the hydraulic tank. Change the hydraulic oil entirely.
5) When checking the filter, if found metal particles in the element, drain out the hydraulic oil entirely,
flush the whole circuit, and then fill with new oil. The presence of metal particles may indicate
internal damage to the equipment. In such a case, check carefully before flushing, and repair or
replace as required.
6) To add and/or change the hydraulic oil, always use recommended oil.(Refer to the list of
recommended oils and lubricants at page 1-22, Recommended lubricants.) Never mix oil of
different makes of kinds.
7) To change the hydraulic oil, use a clean vessel and funnel for pouring it into the tank. Never use
cloth because it might cause the presence of lint in the circuit.
8) When removing the hydraulic equipment, be sure to put plugs or caps on hoses, tube lines and
ports. Also, enter mating marks for later identification.
6-44
9) Disassemble and/or assemble the hydraulic equipment only in a clean place free of dust. When
disassembling, be careful about the interchangeability of parts, and clean the disassembled parts
with pure and clean mineral cleansing oil. Clean the internal passages as well. After the parts
have dried, wipe them off with a clean lint-free cloth.
10) When overhauling the hydraulic equipment replace all O-rings, backup rings, etc. with new ones.
Assemble O-rings with grease or vaseline applied.
11) After installing the equipment, add more hydraulic oil to make up for that lost during disassembly.
12) Tighten joints correctly. Loose joints will cause the hydraulic oil to leak. If the oil leaks, the tank oil
level drops and air gets sucked in, so the pump will break down. Also loose joints in suction lines
will take air in and might cause abnormal noise, malfunction or damage to pumps.
6-45
GROUP 3 TESTS AND ADJUSTMENTS
6 -46
5) Start the filter caddy. Check to be sure oil is
flowing through the filters.
Operate filter caddy approximately 10
minutes so oil in hydraulic oil tank is
circulated through filter a minimum of four
times.
※ Hydraulic oil tank capacity : 150 ℓ
(39.7U.S. gal)
Leave filter caddy operation for the next
steps.
6) Start the engine and run it at high idle.
※ For the most effective results, cleaning
procedure must start with the smallest
capacity circuit then proceed to the next
largest capacity circuit.
7) Operate all functions, one at a time, through
a complete cycle in the following order:
Clam, steering, bucket, and boom. Also
include all auxiliary hydraulic functions.
Repeat procedure until the total system
capacity has circulated through filter caddy
seven times, approximately 30 minutes.
Each function must go through a minimum
of three complete cycles for a through
cleaning for oil.
※ Filtering time for machines with auxiliary
hydraulic functions must be increased
because system capacity is larger.
8) Stop the engine. Remove the filter caddy.
9) Install a new return filter element.
10) Check oil level in reservoir; Add oil if
necessary.
6 -47
2. BOOM HEIGHT KICKOUT ADJUSTMENT
1) Lift the boom up to a desired height, set the
boom control lever at hold, then stop the
engine.
Be careful lest work equipment fall down.
Put the hydraulic safety lock lever in the Boom
LOCK position.
Proximate switch
7707WE20
Plate
7707WE21
Boom
7707WE22
7707WE23
6 -48
3. TEST TOOLS
1) CLAMP-ON ELECTRONIC TACHOMETER
INSTALLATION
·Service equipment and tools
Tachometer
A : Clamp on tachometer.
Remove paint using emery cloth and B
connect to a straight section of injection D
line within 100mm(4in) of pump. Finger C
Tighten only-do not over tighten.
B : Black clip(-). Connect to main frame.
C : Red clip(+). Connect to transducer. A
D : Tachometer readout. Install cable.
(770-3ATM) 6-49
(770-3ATM) 6-49
mph
7807A3CD03
6 -49
4. HYDRAULIC OIL WARM UP PROCEDURE
1) Install temperature reader(See temperature
reader installation procedure in this group).
2) Run engine at high idle.
3) Hold a hydraulic function over relief to heat
the oil.
4) Periodically cycle all hydraulic functions to
distribute warm oil.
5) Heat oil to test specification(Approx. 45°
C).
6 -50
5. MAIN HYDRAULIC PUMP FLOW TEST
· SPECIFICATION
Oil temperature 45±5°C(113±9° F)
Engine speed 2100±25rpm
Test pressure 210±5bar(2990psi)
Maximum pump flow 280ℓ/min(74.0gpm)
· FLOW METER GAUGE AND TOOL Flow meter
Gauge 0~35MPa(0~350bar, 0~5000psi)
Temperature reader
To MCV
1) Make test connections.
2) Install temperature reader.
(See temperature reader installation
procedure in this group)
3) Heat hydraulic oil to specifications.
(See hydraulic oil warm up procedure in this
group)
4) Run engine at test specifications.
5) Close flow meter loading valve to increase
pressure to test specifications.
6) Read flow meter.
7) If flow is below specifications, check suction
line and suction pressure for abnormality
before removing pump. 7607WE29
6 -51
6. LOADER SYSTEM AND PORT RELIEF
VALVE PRESSURE TEST
· SPECIFICATION
Oil temperature (40~50°
C)
210±5kg/cm2
System(M) High U
(2987±70psi)
Boom 240±5kg/cm2
Low Boom
raise(U) (3414±70psi)
Bucket
Bucket 240±5kg/cm2
Low
rollback(R) (3414±70psi)
R
Bucket 240±5kg/cm2
Low
dump(D) (3414±70psi) M D
6 -52
※ Do not adjust the system relief valve
above 250kg/cm 2 (3560psi). Damage to
the pump will result from excessive
pressure settings.
5) To check the bucket dump, bucket rollback,
and boom raise, adjust the system relief
valve to 250kg/cm2 (3560psi).
Run engine to maintain 800 ~ 850rpm when
hydraulic function is activated over relief.
Activate the function to be checked with the
cylinder bottomed. Read the pressure
gauge.
If pressure is not to specification cycle relief
valve over relief 10 times to flush.
Read pressure gauge again. Turn screw
to adjust valve to specification.
※ Do not work machine with system relief
adjusted above specification or structural
damage may occur.
6) Adjust system relief valve to specification.
6 -53
7. HYDRAULIC SYSTEM RESTRICTION TEST
· SPECIFICATION
Oil temperature 45±5° C(113±9°F)
Engine speed High idle
Maximum pressure 2MPa(20bar, 285psi) at
steering valve(EHPS).
Maximum pressure at main control valve
1MPa(10bar, 145psi)
· GAUGE AND TOOL
Gauge 0~7MPa(0~70bar, 0~1000psi) 2EA
This test will check for restrictions in the
hydraulic system which can cause
overheating of hydraulic oil.
1) Install temperature reader. P
(See temperature reader installation
procedure in this group)
2) Heat hydraulic oil to specifications.
(See hydraulic oil warm up procedure in this
group)
3) Connect fitting and gauge to steering valve.
4) Connect fitting and gauge to main control
valve.
Do not operate steering or loader funct-
ions or test gauge may be damaged.
5) Run engine at specification and read
pressure gauges.
If pressure is more than specification at the
loader control valve, check for a kinked, T
dented or obstructed hydraulic line. Check
loader control valve for a binding spool.
If pressure is more than specification at the
steering unit, inspect neutral condition of
the steering unit and steering valve for a
stuck spool. Make sure orifice plugs are
installed in ends of priority valve spool.
Check for plugged orifice in priority valve
and dynamic signal orifice on steering valve
7607WE31
body.
6 -54
8. LOADER CYLINDER DRIFT TEST
· SPECIFICATION A
Oil temperature 45±5°
C(113±9°
F)
Boom horizontal
Bucket horizontal
Bucket unloaded
Item Standard value B
Retraction of boom
40mm A : Retraction of bucket cylinder rod
cylinder rod
B : Retraction of boom cylinder rod
Retraction of bucket
50mm
cylinder rod
6 -55
9. BOOM AND BUCKET CYLINDER LEAKAGE TEST
· SPECIFICATION
Oil temperature 45±5° C(113±9°
F)
Engine speed Low idle
Maximum leakage 15 mℓ/min(1/2 oz/min)
· GAUGE AND TOOL
Temperature reader
Stop watch
Measuring container
1) Fasten temperature sensor to head end
port of cylinder to be tested. Cover sensor
with a shop towel.
2) Heat hydraulic oil to specifications(See
hydraulic oil warm up procedure in this
group).
Never work under raised equipment
unless it is supported with a hoist or
support stands.
3) Full extend the cylinder to be tested. If
testing the boom cylinders, restrain boom in
the fully raised position using a hoist or a
stand.
※ Check cylinders for leakage in the fully
extended position only. In the retracted
position contacts the end of the cylinder
and seals off piston seal leakage.
4) Remove and plug cylinder rod end hose or
line.
5) Run engine at slow idle. Activate control
lever to extend cylinder for 1 minute over
relief while measuring leakage for open
port.
If leakage is within specification, excessive
cylinder drift is caused by leakage in the
loader control valve or circuit relief valve. (770-3ATM) 6-56
6 -56
10. PILOT CONTROL VALVE PRESSURE TEST
· SPECIFICATION
Oil temperature 45±5° C(113±9° F)
Engine speed Low idle
Begin metering 1/4" of lever travel
Pressure in detent :
Boom float detent 1.9MPa(19bar)
Pressure at feel position :
Boom power down 19~22bar
Boom raise 19~22bar
Bucket rollback 19~22bar
Bucket dump 19~22bar
· GAUGE AND TOOL
Gauge 0~7MPa(0~70bar, 0~1000psi)
As the control lever is moved from neutral,
the pilot pressure will suddenly jump up to
approximately 5.8bar at 1/4in. travel. The
pressure should then increase smoothly to
the specification at the FEEL position(Or
3/4 lever travel), and then jump up about
430psi as the lever is moved into detent.
This test will determine if adequate pilot
pressure is available to move the loader
control valve spools.
※ The FEEL position is when lever is
moved to feel the ramp of the detent
before lever passes into detent position.
6 -57
5) Run engine at specification. Activate
function to be checked and record pressure
reading.
※ If boom raise or bucket rollback FEEL
positions are not operation due to boom
or bucket position, plug boom float
detent wires into bucket leveler solenoid
or boom height kickout solenoid. This
will provide a feel position on the control
lever.
6 -58
11. PILOT OIL SUPPLY UNIT PRESSURE
TEST
· SPECIFICATION
Oil temperature 45±5° C(113±9° F)
Engine speed Low idle and stop
Pilot pressure setting
30~35bar(430~500psi)
Relief valve setting pressure 45bar
Accumulator precharging pressure 16bar
· GAUGE AND TOOL
Gauge 0~7MPa(0~70bar, 0~1000psi)
The pilot supply unit consist of the pressure
reducing valve, the relief valve and an
accumulator. This regulates pressure to
the pilot control circuit. T
U
P2
6 -59
12. CYCLE TIME TEST
· SPECIFICATION
Oil temperature 45±5° C(113±9°
F)
Engine speed High idle
6 -60
13. HYDRAULIC OIL FILTER INSPECTION
PROCEDURE
1) Lower the bucket to the ground, stop the
engine, move the control lever back and
forth several times, and clean all over the
upper surface of the hydraulic oil tank.
2) Remove the bolts(1) and take out the filter 1
case cover(2) and O-ring(3). 2
3) Remove the spring(4) and bypass valve(5). 3
4
4) Remove the filter element(6) from the tank.
5
5) Check the element and the filter case
bottom for debris. Excessive amounts of 6
brass and steel particles can indicate a
failed hydraulic pump or a pump failure in
process. A rubber type of material can
indicated cylinder packing or other packing
failure.
※ The hydraulic oil filter in the filter case of
the hydraulic oil tank should be replaced
every 250 operating hours or more often.
When the filter element is replaced,
please keep as follows.
(1) Clean the inside of the filter case.
(2) Place new element in the proper positions
inside the filter case.
(3) Install the bypass valve and spring. Make
sure the element stand upright, and check
for complete contact of the element
bottom with the filter case bottom.
(4) Install the O-ring and filter case covers.
Tighten them with bolt. Replace the O-
ring with new one if damaged.sa 7607WE32
6 -61
GROUP 4 DISASSEMBLY AND ASSEMBLY
1. MAIN PUMP
1) STRUCTURE
21
20
4
3 5
23
13
11 12
22
19
15
8
7 14
6
17
18
9
16
8 15
7 14
6 13
12
11
10
1
2
7607WE33
6 -62
2) DISASSEMBLY
21
20
4
3 5
23
13
11 12
22
19
15
8
7 14
6
17
18
9
16
8 15
7 14
6 13
12
11
10
1
2
7607WE33
※ Plug all ports prior to cleaning and disassembling pump to prevent ingress of debris or
contamination.
※ Clean the pump thoroughly with a solvent, ensuring no loose debris or contamination remains on
the unit.
※ Mark each interface and then separate into individual pump sections.
(1) Securely clamp pump horizontally on one port face, ensuring that no damage is sustained to the
port face and remove the stud(20) and nut(21).
(2) Remove the front adaptor(2) from the body(16) using a pulling tool centred on the drive shaft(9).
※ Under NO circumstances attempt to prise or chisel cover from body as such action could damage
the machined sealing faces.
(3) Remove and discard the shaft seal(1) from adaptor making sure that no damage is sustained to
the surface of the seal bore.
(4) Unclamp pump and place it vertically with drive shaft up.
(5) Before removing wearplate from the body mark it using a soft pencil or a felt-tip pen to ensure
correct reassembly. Remove wearplate(8) complete with O-ring seal(7) and back up seal(6).
6 -63
DISASSEMBLY
21
20
4
3 5
23
13
11 12
22
19
15
8
7 14
6
17
18
9
16
8 15
7 14
6 13
12
11
10
1
2
7607WE33
6 -64
3) MANDATORY REPLACEMENT PARTS
Discard all seals including interface seals, shaft seals, wear plate seals and back up seals. Fit new
seals on reassembly. Wearplates should also be replaced with new items from seal kit.
4) HANDLING/STORAGE
While disassembling pump, ensure no surfaces are scored or marked in any way. A rubber
surfaced table will be beneficial. All components must be placed in a clean, dry and safe area.
Leakage will be created by scratches on components. If parts are to be left for any period ensure
they are not exposed to dirt, dust and corrosion. Keep gears separate from each other in
protective boxes.
5) INSPECTION OF PARTS
Wash all parts in a solvent and dry.
(1) Adaptor housing and cover
The pump must be replaced if the damage listed is present.
Feature Damage
Corrosion, nicks or burrs(slight burrs can be removed
Surfaces
using and india stone)
Machined sealing lnterfaces Scores, cracks or corrosion
Bearing Loose
(2) Gears
The pump must be replaced if the damage listed is present.
Feature Damage
Corrosion, nicks or burrs(slight burrs can be removed
Surfaces using an lndia stone).
Wear due to seal(s)
Journals Pitting, wear, sufficient wear to change outside diameter
Tooth Cracks or heavy scoring or chipped
Splines/keyways Distortion of wear
End faces Wear, cracks
6 -65
(3) Floating wear plates
The pump must be replaced if the damage listed is present.
Feature Damage
(4) Bolts/Studs
The pump should be replaced if the damage listed is present.
Feature Damage
(6) Coupling
This must be replaced if damage listed is present.
Feature Damage
6 -66
6) ASSEMBLY
21
20
4
3 5
23
13
11 12
22
19
15
8
7 14
6
17
18
9
16
8 15
7 14
6 13
12
11
10
1
2
7607WE33
※ It is critical that the wearplates are assembled into the pump with regard to the following:
-The seal side of the wearplate must be adjacent to the adaptor or body.
-The high pressure side of the wearplate must be adjacent to the outlet port.
※ This must take place in a clean dry area, ensuring that all parts are clean and free from
contamination or loose particles. Lightly oil all surfaces.
(1) Place body vertically with gear pockets upper most.
(2) Slide wearplate(11) complete with O-ring seal(12) and back up seal(13) down through the
housing to the bottom of the gear pockets.
※ Be sure to refit the wearplate the same as that marked from this position during disassembly.
(3) Fit the gears(18,19) within the housing taking care to replace as marked, with the teeth
reassembled to their original related position.
(4) Fit the wearplate(8) complete with O-ring seal(7) and back up seal(6).
※ Be sure to refit the wearplate the same as that marked from this position during disassembly.
6 -67
ASSEMBLY
21
20
4
3 5
23
13
11 12
22
19
15
8
7 14
6
17
18
9
16
8 15
7 14
6 13
12
11
10
1
2
7607WE33
6 -68
2. MAIN CONTROL VALVE
1) STRUCTURE
89
11
37
32
33
34 24
23 22
7 35 22
17 23
24
36 21
20 17
19
18 3 24
11 17 23
22
2 12
16
5 1
4 12
12
13
6 1514
21
11 9
8
31 13
25 1514
26 12
27 25
26 11
28 27 39
30 28 38
29 40
7607WE35
6 -69
2) GENERAL PRECAUTIONS
(1) Clean room with no dust is recommended for maintenance. Because hydraulic components are
precision, and have minute clearance. Tool and wash-oil must be clean, too. Handle them
carefully.
(2) At removing control valve from the machine, wash around the piping port, and neither dust nor
water should go into inside with plugging. It is same at attaching the machine.
(3) Prepare the required parts by checking structure figure before assembly. There are parts which
are supplied with only sub-assembly part, so check the parts list before assembly.
3) PRECAUTIONS FOR DISASSEMBLY
(1) Handle the components carefully not to drop them or bump them with each other as they are
made with precision.
(2) Do not force the work by hitting or twisting as burred or damaged component may not be
assembled or result in oil leakage or low performance.
(3) When disassembled, tag the components for identification so that they can be reassembled
correctly.
(4) Once disassembled, O-ring and back-up rings are usually not to be used again.(Remove them
using a wire with its end made like a shoe-horn. Be careful not to damage the slot)
(5) If the components are left disassembled or half-disassembled, they may get rust from moisture or
dust. If the work has to be interrupted, take care to prevent rust and dust.
4) PRECAUTIONS FOR REASSEMBLY
(1) Take the same precautions as for disassembly.
(2) When assembling the components, remove any metal chips or foreign objects and check them for
any burrs or dents. Remove burrs and dents with oil-stone, if any.
(3) O-rings and back-up rings are to be replaced with new ones, as a rule.
(4) When installing O-rings and back-up rings, be careful not to damage them. (Apply a little amount
of grease for smoothness)
(5) Tighten the bolts and caps with specified torque.
5) SPECIAL TOOL
· HOLDER
Material : copper
41 Hex : Division
100
28.2
7607WE36
6 -70
※ Regarding to change the main plunger
We can not supply the main plunger,
because the plunger is fit for valve
housing.
So, do not change the plunger at the field.
If changing plunger must be needed, then
tell us model name of control valve and Name plate
serial number written at its nameplate.
7607WE37
7607WE39
6 -71
(4) Remove the plunger cap(3), spring guide
(4), spring(5) and sleeve(6).
※ Spring is different from boom section
spring. 3
4
5
6
4
7607WE41
7) BOOM PLUNGER
(1) Remove hexagon socket bolts(1) then
remove cover(2).
·Hexagon socket bolt
Width across flat : 8mm
Tightening torque : 5.1kgf·m(36.8lbf·ft)
※ Reassembly
Install cover(2), after making sure that 2 1
O-ring is placed on the edge of the housing 7607WE43
hole.
7607WE44
6 -72
(3) Set the spool between holders and loosen
Holder
plunger cap(3) by using vise.
·Plunger cap
Width across flat : 8mm
Tightening torque : 6.1kgf·m(44.2lbf·ft)
※ Set the spool between holders and clamp 3
them by a vise after degreasing the spool
and holders as a special tool.
7607WE45
6
7
7607WE46
3 4 5
7607WE48
6 -73
(2) Loosen hex nut(2), and remove adjust
screw(3), spring(4) and pilot poppet(5).
·Hex nut(2)
Width across flat : 19mm
2 5
Tightening torque : 3.3kgf·m(23.6lbf·ft)
·Adjust screw(3) 4
Width across flat : 22mm
3
7607WE49
7
6
9
8
7607WE50
Pilot seat
7607WE51
6 -74
(5) RESETTING THE RELIEF PRESSURE
7607WE52
※ If setting pressure is mistaken, hydraulic unit may be destroyed and danger may be caused.
Do not raise by any means more than the pressure decided for every model.
Tempolary assembly and setting
① Check the position of setting pressure 0 MPa.
Set adjusting screw(A) temporarily in the position that pilot poppet(B) contacts to pilot seat.
Then pressure adjusting spring(C) begins to be effective.
② Install the main relief valve which is set temporarily to main body.
Tighten cap with torque wrench.
·Tightning torque : 10.2kgf·m(73.8lbf·ft)
To set pressure
① Attach exact pressure gauge at exit of pump or gauge port of control valve.
② Operate the pump with rated speed.
③ Operate plunger either boom or bucket at full stroke and check the pressure.
④ Turn adjusting screw(A) (right turn) and set pressure with checking pressure gauge.
·One quarter turn of adjusting screw(A) equals about 4 MPa.
·Setting pressure 20.6MPa(210kgf/cm2) at 220ℓ/min.
·Relief is very sensitivity. So, do not turn adjusting screw(A) suddenly.
⑤ Tighten lock nut with torque wrench holding adjusting screw.
·Tightning torque : 3.3kgf·m(23.6lbf·ft)
※ Operate plunger and check the setting pressure, again.
6 -75
9) PORT RELIEF VALVE
Adjusting screw
※ Do not disassemble adjusting screw.
It’s impossible to readjust setting pressure
exactly on the machine.
(1) Loosen sleeve(1) and remove relief valve.
·Sleeve(1)
Width across flat : 41mm
Tightening torque : 10.2kgf·m(73.8lbf·ft)
6 5 4 3 1 2
※ Install to original position. 7607WE53
7607WE54
4 3 1 2
7607WE55
7607WE56
6 -76
11) LOAD CHECK VALVE
2
1 1
2
3 4 3
6 -77
3. REMOTE CONTROL VALVE
1) STRUCTURE
2
1
3-1
3-2
Locite 262
3-3
5
11-1
11-2 12-1
4,3,1 12-2
4 1
10 3 2
30
11-3 12-3
11-4 12-4
2
33 30
11-5
11-6
4,3,1 14 32
40
15
40
4 1
20-1 42
20 3 2
22
21
23 4 1
3 2
25
26
7707WE64
6 -78
2) DISASSEMBLY AND ASSEMBLY
(1) PUSH BUTTEN
※ The remote control valve does not need to be removed from the machine to perfom this operation.
Remove worn pushbutton using a small screwdriver.
The installation of new elements is performed without any special tools; the parts are simply
pressed into place.
(2) RUBBER BOOT
① Remove the remote control valve from the machine or free the valve by unscrewing the 4 screws
fixing the plate in order to release the electrical cable.
·Assembly
Torque : 1.02kgf·m(7.4lbf·ft)
Hold the remote control valve using a vice or a vice-grip wrench(clamp onto the body).
※ The pilot unit does not need to be removed from the machine to release the cable. However, it is
recommended to lift the control unit by undoing the 4 fixing screws on the arm rest.
※ It is unnecessary to remove the units with no electrical functions.
② Lift and turn the boot inside out.
③ Remove the grommet(7) from its emplacement to free the cable.
④ Loosen the handle mounting nut(3-3) using a 19mm open-end wrench.
·Assembly : torque 4.08kgf·m(29.5lbf·ft)
⑤ Unscrew and remove the handle(1).
·Assembly
- Add loctite 262 onto the lever thread
- Torque : 4.08kgf·m(29.5lbf·ft)
⑥ Replace the faulty rubber boot(4) with a new one.
⑦ Replace the handle(1) following the disassembly instructions in reverse order.
(3) HANDLE
① Clamp the threaded section of the lever(3-2) in a vice fitted with V-shaped vice clamp.
② Remove the pin(3-1) using a 5mm pin driver.
③ Replace the lever(3-2) onto the new handle(1) and secure it with the pin(3-1) using a 5mm pin
driver.
※ Respect the position of the curved lever to ensure that the handle is correctly oriented as
indicated by the machine’s technical specifications.
④ Replace the nut(3-3) on the threaded section and replace the boot(4).
6 -79
(4) DETENT CARDAN BRACKET KIT
※ Remove the 2 grommets(20-1) from the W
flange (20).
V
※ Place centering sleeves V & W to avoid
damaging the cardan knuckles while
loosening the nuts.
※ Unscrew the locking nut(5) using a
23mm open-end wrench.
·Assembly : Torque 4.08±0.4kgf·m
(29.5±2.9lbf·ft)
① Unscrew the self-locking nut(11-1) using Before loosening the nuts
6 -80
(8) INTERMEDIARY PLUNGER KIT
① Undo the intermediary plunger guide(23).
② Remove and replace the intermediary plunger kit assembly(22).
(9) GUIDE / PLUNGER AND REGULATION UNIT
※ Beware of the plungers that might jump out due to the spring return.
① Remove : - Guide/plunger assembly(30).
- Regulation unit(32/33).
- Return spring(40).
- Pre-feeling point kit(42).
② The remote control valve is now totally disassembled.
Assemble in reverse order following the torque specification.
6 -81
SECTION 7 ELECTRICAL SYSTEM
1. LOCATION 1
1
2 Cab roof
LH Side
Front
3
4 12 15
5 13 16
6 14 17
Cab roof
18
19 20
7 26
8
A
9
10
11 21
22
23
24
25
7607AEL02
7-1
2. LOCATION 2
1 2 3 4 5
6
7
16
15
8 14
13
9 10 11 12
7707AEL02-1
7-2
MEMORANDUM
7-5
GROUP 2 ELECTRICAL CIRCUIT
5W 33 MCU
EM'CY PUMP MOTOR SW
CLUTCH CUT-OFF PS
3R 34 BRAKE PS PARKING PS
CLUTCH CUT-OFF SW
WARNING
15 MECHANICAL ENG(GND)
RESISTER
SPEEDMETER SIG.
3Br 31 BUZZER
2
R 35
STEERING P/P PS
TACHO SENSOR+
REVERSE FAN SIG
TACHO SENSOR-
ELEC.STEERING
PROGRAM DUMP
B
COOLANT TEMP
A
RIDE CONT. ON
Pa
Pa
3Y 32
AUTO SEL.TCU
MAIN PUMP PS
FAN CLUTCH+
BUZZER STOP
MULTI SW- LIGHT COM
AUTO SEL.SW
23 STOP LAMP PS
STEERING RY
POWER IG(NC)
POWER IG(NC)
87a 87 85
NEUTRAL SIG
FAN CLUTCH-
30 86
CLUSTER SERIAL GND
PARKING SIG
FUEL HEATER
HOUR METER
PREHEATER
CLUSTER HIGH BEAM
OPTION PS 2
OPTION PS 1
MULTI SW- WASHER
SAFETY RY
CLUSTER SERIAL-Lo
AIR FILTER
CLUSTER SERIAL Hi
ALT LEVEL
CD-26
BRAKE PS
WIPER RY
WASH SIG
CD-3
SERIAL-H
CN-98
CN-26
SERIAL-L
MULTI SW- HORN
RS232 RX
WIPER MOTOR Lo
RS232 TX
2
ATT. UNLOCK SW
2
WIPER MOTOR Hi
BUZZER
1
MIRROR HEATED
1
WIPER MOTOR B
MULTI SW- COM
MULTI SW- Hi IG
6
11
12
13
20
21
22
23
24
25
26
27
28
14
15
16
17
18
19
10
10
TURN LAMP RH
OPTION
OPTION
OPTION
OPTION
LIGHT Lo BEAM
1
2
3
4
5
6
7
8
9
TURN LAMP LH
CAN-H
LIGHT Hi BEAM
IG 24V
CAN-L
MULTI SW- INT
22 OTMP1
2
Bat24V
1
CLUSTER GND
CR-37
CS-75
C
ATT. LOCK SW
B
ILLUMINATION
A
SPARE
GND
X2B-FWD-ED4
21 ODP2
20 ODP1
ATT. SW COM
X2D-NEU-ED6
CLUSTER F/R
X2C-REV-ED5
87a
X1C-AD1-ED1
X1B-AD2-ED2
X1A-AD3-ED3
GND
NEUTRAL RY/JOYSTICK F/R 10A
BEACON/REAR WORK LAMP 20A
20A
20A
10A
30A
30A
CIGARLIGHTER/MIRROR 30A
30A
20A
30A
30A
20A
30A
10A
10A
10A
10A
10A
10A
10A
30
10A
86
85
20A
87
X1D-KD-ED7
CN-170
10A
CASSETTE/ROOM LAMP 5A
5A
5A
10
1
NC
2
70A B
3
8
9
7
6
4
70E B
125 V
126 L
BATT. 24V
27A RW
2
1
W
CN-58
53G G
CN-59
52F V
X2A-VP
IG 24V
ILLUMINATION LAMP
ILLUMINATION LAMP
27
26
24
23
21
28
25
20
36
35
34
33
32
31
30
29
16A GrW
22
19
11
FRONT WORK LAMP
17
14
128 OrW
18
16
15
13
12
10
6
7
5
4
3
2
1
106 OrW
8
9
HORN/CONVERTER
19
18
17
16
14
13
12
11
10
B
GND
9
8
7
1
5
2
6
3
B
115
G
NC
NC
BACK.STOP LAMP
AIR-CON/HEATER
NC
NC
NC
NC
NC
NC
NC
NC
AIR-CON/HEATER
174 G
G19 B
64E Or
G23
G41
G11 B
G40
CLUSTER/MCU
OrW
GrW
OrW
WOr
GOr
GOr
GOr
BOr
BOr
174
24A ROr
143 BOr
RW
123 GW
YW
PRE-HEATER
SEAT
LW
15
14
13
12
11
10
177
11
12
10
15
14
13
12
11
10
100 W
104 Or
Or
Or
Or
102 G
1L
160 Or
7
Br
9
8
103 B
9
8
7
6
5
4
W
4
3
2
1
3
2
1
72A Br
6
TURN LAMP
HEAD LAMP
101 L
7
G
9
8
5
4
3
2
1
5
6
4
3
2
1
CN-156
6
START KEY
Y
B
V
L
L
CASSETTE
G21
CLUSTER
ILL.LAMP
B
A
CN-36
69A
SWITCH
105
106
107
108
109
110
111
112
113
114
175
115
116
183
117
118
119
120
121
122
123
124
125
126
CN-163
CN-16
73
57
53
52
55
70
27
WIPER
CN-17
CN-15
ECM
CR-35
15
14
13
12
11
10
MCU
ECM
7
11
9
8
12
5
RCV
4
3
2
1
6
10
TCU
TCU
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
7
9
8
5
4
3
2
1
5
6
4
3
2
1
6
87a
CN-169
86 30
12F LW
B G14
G5 B
85
4
3
2
1
BrW
ROr
ROr
OrW
WOr
GrW
WOr
31
GW
3Br
GrW
GrW
YW
VW
ROr
ROr
120 LW
LW
159 GY
GW
VOr
SH
3Or
RW
RW
YW
VW
RW
LW
3W
Gr
LW
Or
87
163 Br
W
W
TO: FRONT HARNESS
2L
Or
Gr
Gr
CN-9
162 G
V
V
B
Y
W
W
Br
CS-59
W
L
G
172 G
CN-126
R
173 R
Y
G61 B
28A L
L
L
G
L
65A G37 116 GOr
B
RW
86
CN-168
1 1 MAIN PUMP PS
11E
14F
85 8787a 10 10
161
134
158
21
W
3Or
68A
92A
181
16K
108
182
107
9
Y
154
155
12
10
13
14
15
19
21
23
11
16
22
24
25
26
69
68
66
67
G
64
17
20
27
28
29
30
4
3
1
2
R 124
7E
30 1K
90
24
29
51
81
83
49
85
82
74
2
5
7
6
2
1
2 STEERING PUMP PS
2
3
4
9
8
GrW
184
185
188
POWER RY 16F
G6
8 3 3 STEERING MOTOR RY
8 TO:PC 128 OrW
RW
CR-25 6 7 4 4 STEERING MOTOR RY
G22 B
Y
2 129 V
86 30 87a 6 5 5 HORN
B G15 WOr 3 130 LW
188
185
85 7 6 BOOM DOWN PS
32 5 5 6
3Y 1 131 G
87 4 SH 182 7 7 BUCKET LEVELER
G 65 132 Br
86 3 8 8 BOOM KICK OUT
85 87 87a Or 21A SH 187 133 Or
30 2 9 9 BOOM DOWN PS
GrW 118 155 W
ECM POWER RY 1 10 10 ATT. UNLOCK SOL
70 B
AUTO/MANUAL SW 11 11 STEERING PS(GND)
154 GW
12 12 ATT. LOCK SOL
ST C
6
5 CS-2
6 CN-10
GrW 157 R
BR ACC
2H
3 5 1 1 PROXIMITY SW 24V
68 V
2 2 2 HEAD LIGHT Hi
B
1 4
G 65 G23 B
4 3 3 3 GND
H
L 153 G24 B
0,I
2 4 4 GND
Or 21E 177 B
H0 I
1 5 5 PROXIMITY SW(GND)
7A ROr
6 6 ILLUMINATION RH
6A RW
CR-33 7 7 ILLUMINATION LH
START SWITCH 134 GW
86 30 87a 8 8 HEAD LIGHT Lo
BW 186 67 Y
85 9 9 TURN LAMP LH
BrW 176 66 Or
87 10 10 TURN LAMP RH
L 9G 152 BW
86 11 11 GND TM
85 87 87a L 9F 144 BOr
30 12 12 GND STD
AC CONDENSOR FAN RY 13 13
G21 2B
14 14 HEAD LIGHT GND
15 15
CN-11 36 CN-134
B 96A
DIAGNOSTIC
1 AC CONTROLLER GND 1 6
B 96 5
2 BLOWER MOTOR GND 2
2L 9 47 BW
3 AC 24V 3 4
Or 160 36E B
4 REVERSE FAN SIGNAL 4 3
R 25 44 Gr
5 AC CONTROLLER B+ 5 2
Y 145 28E L
6 AC COMP 6 1
AC CONDENSOR FAN BW 186
7 7
R 1A CN-157
8 ILLUMINATION 8
36 B
1 VM1-GND
CR-7 36A B
87a 2 VM2-GND
86 30 37 B
V 146 3 VMG1-SPEED PICK-UP COM
85 38 BOr
VW 147 4 VMG2-SPEED SENSOR OUTPUT
87 39 ROr
L 9E 8 VPS2-RIDE CONT. RY(+)
86 40 LW
85 87 87a L 9A 9 AIP5-GEAR BOX Y5
30 41 YW
10 AIP2-GEAR BOX Y1
AIR-CON RY 42 RW
6 ADM3-TM ERROR
CR-26 43 W
G 162 12 VPS1-GEAR BOX VPS1(+)
86 30 87a 43A W
GOr 105 CN-148 13 VPS1-GEAR BOX VPS1(+)
85 54E B 44 Gr
W 8 C 15 SDDK-DIAGNOSTIC
87 53F G 45 WOr
W 8A B 17 ER3-SW FILTER RESTRICTION
86 52E V 46 BOr
85 87 87a R 173 A 49 ER2-SENSOR TEMP CONVERTER
30 47 BW
18 EUPR-DIAGNOSTIC
WIPER RY LO DATA LINK 48 W
19 EF1-SPEED PICK-UP ENG
49 RW
CR-4 20 ED3-SHIFT LEVER-X1A-B3
W 8E 50 YW
86 30 87a 21 ED10-PARKING BRAKE SW(+)
B G13 51 VOr
85 22 ED7-SHIFT LEVER-X1D-KD
G 172 22A R
87 23 VPE1-CONTINUANCE 24V
Br 163 52A V
86 25 CANF_H
85 87 87a L 14A 53A G
30 26 CANF_L
WIPER RY HI 27 CANF_T
54A SH
28 VGS-CAN SHIELD
55 Or
TO: CABIN HARNESS CN-7 29 ED11-SW AUTO/MANU SIG(+)
G 30 56 OrW
CASSETTE IG24V 1 1 32 AIP3-GEAR BOX Y3
RW 57 Y
WORK LAMP FRONT 2 2 171 36 SD4-SPEED METER CLUSTER
Y 20 58 BW
CASSETT B+/ROOM LAMP 3 3 39 ER1-GEAR BOX TEMP
LW 169 59 W
MIRROR HEATER SW 4 4 41 EF2-SPEED PICK-UP TURBIN
Or 183 60 W
MCU 5 5 42 EF3-SPEED PICK-UP GEAR
B 178 74 Br
GND (CASSETTE) 6 6 43 ED4-SHIFT LEVER X2B-FWD
R 28 L
ILLUMINATION 7 7 1 45 VPI-POWER IG
B 179 75 BOr
GND 8 8 46 VMGA2-GEAR BOX TEMP(COM)
B 178A 76 G
ELEC.STEERING 9 9 51 AIP6-GEAR BOX Y6
B 77 V
GND 10 G7 55 AIP4-GEAR BOX Y4
10 78 Gr
G 5A 56 AIP1-GEAR BOX Y2
BEACON SW 11 11
Or 79 GOr
SEAT HEATER SW 12 64F 57 ADM5-RY RIDE CONT.(-)
12 80 Br
L 93 62 EF4-SPEED SENSOR(SIG)
SEAT HEATER SW 13 13
R 63 81 LW
WORK LAMP REAR 14 14 63 ED1-SHIFT LEVER X1C-B1
82 GrW
15 15 64 ED5-SHIFT LEVER X2C-REV
83 L
65 ED2-SHIFT LEVER X1B-B2
84 Gr
CN-8 66 ED9-CLUTCH CUT-OFF SW(+)
L 14 85 W
REAR WIPER 24V 1 1 67 ED6-SHIFT LEVER X2D-NEU
V 166 22 R
WIPER SW-WASHER 2 2 68 VPE2-CONTINUANCE 24V
W 165 86 BOr
WIPER SW-PF 3 3 44 ED8-FWD-JOYSTICK
Or 164 87 Or
WIPER SW-ON 4 4 31 ED13-REV-JOYSTICK
5 5 168 BW
VW 92 30 ED14-NEU-JOYSTICK
MIRROR HEATER 6 6 88 BOr
W 184 52 ADM1-START INTERLOCK RY(-)
STEERING SW 7 7 89 WOr
GrW 16H 5 ADM4-REVERSE DRIVE RY(-)
STEERING SW 8 8 90 LW
7 ADM2-JOYSTICK SELECT LAMP(-)
91 OrW
CR-3 59 ADM5-JOYSTICK SELLECTER(+)
86 30 87a G16
85
B TM CONTROLER
RW 171 CN-6
87 1
G 170 1 NC
86 75 BOr
85 87 87a Gr 15 2 2 GEAR BOX -TEMP(COM)
30 48 W
3 3 ENG.PICK-UP SENSOR
WORK LAMP FRONT 37 B 4 4 ENG.PICK-UP SENSOR
CR-55 45 WOr 5 5 FILTER RESTRICTION
86 30 87a 46 BOr
B G17 6 6 TEMP CONVERTER
85
R 63 7 7 NC
87 58 BW
L 180 8 8 GEAR BOX -TEMP
86 76 G
85 87 87a Gr 5 9 9 GEAR BOX -Y6
30 40 LW
10 10 GEAR BOX -Y5
WORK LAMP REAR 77 V
11 11 GEAR BOX -Y4
56 OrW
CS-36 G36 12 12 GEAR BOX -Y3
B 78 Gr
9 10 10 13 13 GEAR BOX -Y2
R 1G 43 W
9 14 14 GEAR BOX -VPS1+
4 41 YW
8 15 15 GEAR BOX -Y1
2 G 170
7
CN-5
7 1 6
5 1 1 NC
5 70F B
R 1F 2 2 GND-MCU
4 111 Br
3 3 HYD TEMP SENSOR
3 117 BOr
180 4 4 AIR CLEANER SW
I 0
L
2 110 V
R 1E 5 5 FUEL SENDOR
1 59 W
6 6 TURBIN PICK-UP SENSOR
WORK LAMP 37A B
7 7 TURBIN PICK-UP SENSOR
CS-21 G35 8 8 NC
B 38 BOr
9 10 10 9 9 SPEED SENSOR-VMG2
R 1H 80 Br
9 10 10 SPEED SENSOR-EF4(2)
4 28F L
8 11 11 SPEED SENSOR-24V
2 R 1 37E B
7 12 12 INTER GEAR PICK-UP SENSOR
60 W
7 1 6 13 13 INTER GEAR PICK-UP SENSOR
5 R 35
5 14 14 NC
YW 11
4 15 15 NC
3
161 CN-4
I 0
W
2
OrW 10 1 1
1 176 BrW
2 2 AC CONDENSOR FAN
ILL.HEAD LAMP
3 3
16G GrW
SW 2
CR-56 4 4 FAN REVERSE SOL
3 B G52 123 GW
IG 1 5 5 FAN REVERSE SOL
LW 169 145 Y
2 6 6 AC R/DRYER
Or 64 146 V
3 7 7 AC R/DRYER
VW 92 147 VW
4 4 8 8 AC COMP
GND 1 OUT 148 L
9 9 BACK BUZZER
MIRROR HEAT 6 RW
10 10 ILLUMINATION
66A Or
11 11 RH TURN LAMP
7 ROr
CN-138 12 12 ILLUMINATION
VW 13A 67A Y
24V 24V A 13 13 LH TURN LAMP
B G53 63A R
GND B 14 14 WORK LAMP
Or 167 72 Br
12V 12V C 15 15 STOP LAMP
DC/DC CONVERTER CN-3
CN-139 1 1 NC
Or 167 149 LW
2 2 FUEL HEATER
2
B G32 3 3 NC
1 151 BW
4 4 START RY
112 YW
12V SOCKET 5 5 ALT I
187 SH
6 6 SHIELD
150 G
CL-2 7 7 PRE-HEAT RY
Or 64A
8 8 NC
R 1T 153 L
9 9 BATT.RY (DO-1)
B G31 114 Y
10 10 FAN PROPORTIONAL V/V
113 L
CIGAR B 11 11 FAN PROPORTIONAL V/V
12 12 NC
13 13 NC
23 3.0W
14 14 ECM Bat 24V
15 15 NC
CN-1
34 3R
1 1 MASTER SW
33 5W
2 2 FUSIBLE LINK
CN-2
52 V 1 1 ECM-J1939+
53 G
2 2 ECM-J1939-
54 SH
3 3 SHIELD
135 LW
G38
G39
G34
14E
Or 164
4
G18
W 165
G51
GrW 16E
BOr 73A
B G4
Or 104
GrW 157
Br 156
WOr 122
LW 130
G1
Y 127
4
OrW 119
BW 151
GOr 121
LW 12A
1N
R 1R
GY 159
1S
BrW 158
V 129
WOr 3A
WOr 3E
WOr 3F
L 148
YW 50
GrW 16
G3
G2
166
17
136 BW
88
73
69
19
VW 13
WOr89
LW 12
G12
168
144
26
BOr
BOr
Gr 84
WOr
152
131
132
2A
LW 12E
R
L
6
B
86
87
R
B
CN-162
G62
B
62
61
Or 133
Br 156
6 POWER IG
LW 149
BOr 143
G25
G 17E
B
VOr 51A
G
G
B
2
B
Y 127
B
V
Br 72
Gr 4A
Gr 4E
Gr
GOr 79
ROr 39
OrW 91
1V
BOr 137 137 BOr
2E
W 61
R
L 62
B
BW136
LW135
G 150
7
62A
6 7
61A
ECM-SW RETURN
2G
BOr
CN-170
BOr
2F
6 GOr 138 138 GOr
BW
BW
Gr 4
CS-55
Or
5 8 ECM-OFF IDLE
CS-17
Br
W
CN-102
CS-42
CR-5
R
CR-58
R
CR-38
B
2
1
L
CR-11
ON IDLE
4
3
CR-2
R
6
5
2
1
CN-103
CD-5
10 10
87
30
85
86
87a
87
5
87
30
6
10 10
85
4
86
30
85
10 10
87a
2
86
3
87a
1
7
8
6
5
7
4
6
5
9
2
3
9
1
9
1
4
87
30
85
86
W
9
87a
ECM-ON IDLE
3
1
1
1
2
R
R
2
L
4
1
2
CN-71
Gr 140 140 Gr
CD-4
LINEAR THROTTLE
CR-46
CR-59
3
1
10
2
B
E
85 87 87a
6
85 87 87a
6
CN-114
L
CR-41
87
CR-40
30
85
86
87a
85 87 87a
87
141 141
30
CR-36
85
86
87a
W W
M
Lo 5
1
3
2
Hi 4
2 11
86 30
10
ILLUMINATION 12
11
87
87
1
30
87
30
85
11
85
86
ECM-ACCEL POS SIG
86
86 30
30
87a
85
87a
86
86 30
6
5
4
3
2
1
87a
8
9
7
JOYSTICK SELECT
86 30
DO-5
DO-4
G
85 87 87a
E
B
Pf
1
1
2
85 87 87a
2
1 12 12 ECM-ACCEL POS RETURN
Pa
85 87 87a
85 87 87a
85 87 87a
86 30
2
86 30
24V(DETEND)
24V(HANDLE)
PARKING WASHER FLASHER
86 30
86 30
86 30
CLUTCH
M
KICK DOWN
9
7
8
2
UNIT
BUCKET(-)
9
9
7
8
7
2
8
2
NEUTRAL
HORN RY NEUTRAL BACK-UP RY 3
BOOM(-)
CLUTCH CUT-OFF SW PARKING SW RIDE CONTROL SW
FWD
GND
REV
RIDE CONTROL FUEL WARMER 5
NC
BOOM UP BUCKET PREHEAT RY OFF IDLE
REAR WIPER
THROTTLE ASSEMBLY 7607AEL00
7-3
CN-23
SEAT HEATER MIRROR HEATER SW ELEC. STEERING SW BEACON LAMP SW 17 W
1
2
8
7
18
9
1 2 L
2
8
7
9
1
2
8
7
9
2
CN-99
7A V BEACON
A A SPEAKER LH
8A G LAMP
B
M
10
10
5
6
C
10
B 5 6
6
5
CS-80
CN-24
CS-23
CS-76
CS-82
CN-12 CN-93 19 OR
10
CL-7
1
9
2
4
5
6
8
10
10
7
10
1
1
3
9
9
2
4
5
6
5
6
8
10 GOr 1 1
7
3
GOr GOr
9
2
4
5
6
8
7
1 1 OFF IDLE SW 20 GY
11 OrW OrW 2 2 OrW 2
2 11 ON IDLE SW
14 B B 3 3 B
BW
GY
LW
22 GY
3 23 ACCEL POSITION RETURN
36 Or
B
Or
SPEAKER RH
8 W
7H R
6E B
B
7E R
7F R
G4 B
G5 B
G7 B
7L R
G11 B
13 4 4
37 L
W W W
4 9 ACCEL POSITION SIGNAL
G1
22
37
11
12 5 5
36
Gr Gr Gr
9
5 22 ACCEL POSITION SUPPLY
9 BOr BOr 6 6 BOr CN-27
6 34 SWITCH RETURN 17 W
3 V V 7 7 V 1 S.L+
7 46 J1939(+) 1 G
4 G G 8 8 G 2 ACC
8 47 J1939(-) 7 R
5 SH SH 9 9 SH 3 ILL+
9 37 J1939 SHIELD 19 OR
6 LW LW 10 10 LW 4 S.R+
10 40 AIR-HEATER OUTPUT 6A B
7 BW BW 11 11 BW 5 ILL-
11 42 AIR-HEATER RETURN 18 L
8 WOr WOr 12 12 WOr 6 S.L-
12 39 POWER IG 3 Y
7 B+
13 00 00 20 GY
15 W W 13 21 BOr 8 S.R-
14 28 COOLANT LEVEL 6 B
21 BOr 9 GND
15 32 COOLANT LEVEL RETURN
CASSETTE RADIO
CN-13 CN-94
13A W
1 4 BATT (+)
13E W CN-7
2 3 BATT (+) G 1
15 B 1 FUSE-CASSETTE 1
3 2 BATT (-) RW 2
16E LW LW 23 16 B 2 WORK LAMP RY FRONT 2 CL-1
4 1 BATT (-) Y 3 3A Y
16A LW LW 23A 3 FUSE-CASSETTE/ROOM LAMP 3 2
5 LW 4 21 Or
4 MIRROR HEATER CONT. 4 1
6 Or 36
18 BW BW 17 5 MCU 5 G2 B
7 B 6
19 YW YW 18 6 GND 6
8 CN-28 R 7 ROOM LAMP
34 VW VW 19 19 VW 7 ILLUMINATION 7
9 1 B G21
Y
CL-30
G23 B B G3 8 GND 8 3E
10 BW 37 2
G22 B B G1 9 GND 9 21A Or
G21 11 B G1 1
20 G G 20 AIR COMP. 10 GND 10
12 G 9 G3 B
CN-96 11 FUSE BOX 11
16 LW Or 36
B 12 FUSE BOX 12
G2 B L 37
A 13 SEAT HEATER 13 CS-55
R 10 21 Or
14 WORK LAMP REAR 14
DOOR SW
FUEL HEATER 15
15
CN-8
CR-24 CN-80 L 13 CS-1
1 21E Or
15R 1 FUSE BOX V
20 G 14
2 REAR WASHER 2
W 15
START RY. PREHEATER 3 WIPER PF 3
CN-45 CR-23 Or 16
4 WIPER ON SIG 4
M B G1 PREHEATER RY. 5 NC 5
M 1 VW 12
BW 17 6 MIRROR HEAT TIMER 6
2 W 8
7 STEERING SW 7
GrW11
B+ 8 FUSE 8
STARTER
FROM BATT.RY
15 R
CN-74
G8
7A
15
14
13
16
R 22 22 R
B+ 2
18A YW MODE(D/FOOT) RESISTOR RELAY(HI)
G25
INLET M/ACT MODE(VENT) RELAY(M2)
G21
G22
G24
G23
G26
3W/300
TEMP M/ACT
10A
Or
1
W
G
RW 2F
RW 2A
RW 2E
10
R
V
B
RW 2
P 1
G10
VW 12A
YW 18
G9
~ 3
VW 12
L 2 RS-1 1 4 2 7 1 4 2 7
BLOWER
R
M M
3
3 M
1
3
B
M 7
CS-35
R
B
B
7
B
U
10
Lo 1
5
4
1
Hi 4
2
ML 2
3
MH 3
FI 3 5 5
B
M
4
4
2
2
NC
CL-32
CL-33
4
CL-35
CL-36
CL-5
CL-6
10
6
5
6
7
3
5
6
7
5
6
7
1
2
3
4
5
6
7
1
2
3
4
1
2
3
4
1
2
3
4
1
2
2
0,
I
CN-149
ENGINE HARNESS
CN-150
ALTERNATOR
1
2
3
4
1
2
1
1
4
4
2
3
2
3
1
2
1
2
GW
WR
BW
WB
BG
BG
GB
GB
GL
YB
LR
LB
Y
YBr
YW
LG
YW
BG
RY
RY
2B
YB
0 I
L
20A
L
L
9A
9B
1
8
21
22
17
20
18
19
23
24
25
16
15
WORK LAMP FRONT WORK LAMP FRONT WORK LAMP REAR
36A
REAR WIPER SW
26
35
27
33A
32
36
6B
6A
29
33
36
28
35
MIRROR HEATER
OPTION
WB 15
BW 16
LR 17
BG 18
GL 19
20
GW 21
BG 22
WR 23
LB 24
YB 25
LG 26
YBr 27
BG 28
YB 29
LW 30
LY 31
GB 10
1
2
RW 3
RW 4
5
6
BrR 8
GB 9
BATT. RY
AC-22 AC-2
BR
BR
RY
1.25LgB 9
8
G
Y
TO STARTER 14 14 NC
CAB HARNESS
1.25G
13 13 NC
66A G
10
11
12
13
14
15
16
17
18
10
11
12
13
14
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
2 12 12 NC
G13 B 11 11
1 NC
DUCT SENSOR(GND)
TEMP MOTOR ACT(-)
BLOWER RELAY(M1)
BLOWER RELAY(M2)
COMPRESSOR(DPS)
BLOWER RELAY(LO)
MODE M/ACT(FOOT)
INLET MOTOR(REC)
BLOWER RELAY(HI)
10
INLET MOTOR(FRE)
DO-2 10 NC
MODE M/ACT(PBR)
1
2
TEMP M/ACT(PBR)
GW 40 40 GW
MOTOR ACT(REF)
CONDENSER FAN
DUCT SENSOR(+)
MODE M/ACT(M+)
MODE M/ACT(M-)
66 G 9 9 DUCT SENSOR(GND)
CN-1 BW 41 41 BW
ILLUMINATION
3R 1 2
22 L 8 8 DUCT SENSOR(+)
1
BATTERY(+)
BATTERY(+)
1 FUSE BOX 1
POWER IG
5W 2 7 7 NC
2 FUSE BOX 2 R 42 42 R
DO-1 6 6 POWER IG
DUCT G 43 43 G
66E
GND
GND
G 5 5 ILLUMINATION
2 SENSOR
NC
NC
NC
NC
NC
CN-2 19A YW 4
RW 44 44 RW
V 3 1 4 BATTERY(+)
1 J1939+ 1 RW 45 45 RW
G 4 3 3 BATTERY(+)
2 J1939- 2 DO-3 AC & HEATER CONTROLLER BrW 46 46 BrW
SH 5 2 2 GND
3 SHIELD 3 BrW 47 47 BrW
LW 6 1 1 GND
4 AIR-HEATER RY+ 4
BW 7
5 AIR-HEATER RY RETURN 5
WOr 8
6 FUSE-IG 6
BOr 9
7 THROTTLE RETURN 7
CN-160
GOr 10
CN-160
JOYSTICK SELECT10
12
11
JOYSTICK SELECT10
12
11
6
5
4
3
2
1
8
9
7
6
5
4
3
2
1
8
9
7
8 THROTTLE OFF-IDLE 8
OrW 11
9 THROTTLE ON-IDLE 9
Gr 12
ILLUMINATION
CN-160
ILLUMINATION
10 ACCEL-SUPPLY 10
JOYSTICK SELECT10
12
11
6
5
4
3
2
1
8
9
7
KICK DOWN
KICK DOWN
W 13
BUCKET(-)
BUCKET(-)
11 ACCEL SIG 11
NEUTRAL
NEUTRAL
F/R COM
BOOM(-)
14
BOOM(-)
B
ILLUMINATION
12 ACCEL RETURN 12
FWD
GND
COM
FWD
KICK DOWN
GND
REV
REV
24V
24V
NC
BUCKET(-)
NC
NEUTRAL
CN-3
BOOM(-)
1 NC 1
OrW
VOr
BOr
COM
FWD
GND
BW
REV
LW 16
24V
10 Or
W
NC
G
1 R
B
2 FUEL HEATER RY OUT 2
L
3 NC 3
5
7
6
4
3
2
8
9
BW 18
4 ANTI-RESTART RY 4 CN-110
YW 19
5 MCU-ALT 5
SH 24 1
6 SHIELD 6
G 20 2
7 PRE-HEAT RY OUT 7
BrW 21
8 NC 8 CN-114
L 22
9 START KEY SW-br 9 8
Y 25
10 MCU-FAN CLUTCH+ 10 7 FROM BATT. RY
L 26
7A
7 FL- FL+ 3
10
11 MCU-FAN CLUTCH- 11 6
BOr 9
BW 8
7
VOr 6
OrW 5
ROr 23
R 1E
R 1A
12
W 3
L 2
B 4
R 1
12 NC
CN-110
CN-114
6 BO- BO+2
Or
G
G
4
6
2
1
2
13 NC CN-154(GRAY) 3
1
13 4 M
W 15 25 Y
5 BK- BK+ 1
CN-114
14 FUSE-Bat24V 14 2 3 MOTOR RY
CN-160
26 L
BK+ 3
FL+ 1
BO+2
4
6
2
1
5
6
5
4
3
2
1
8
9
15
7
15 NC 1 2
7
6FWD
5NEU
7REV
BK+ 3
FL+ 1
BO+2
1ON
2KD
CN-4 TWO LEVER CD-40
CN-155(BLACK)
5 BO-
6 BK-
5A B
4 FL-
1 NC 1 30 G CN-19 2 Pa
BrW 28 2
8
5 BO-
4COM
1
6 BK-
4 FL-
3 NC 3 STD 3 GrW GrW 2
G 30 FAN REVERSE SOL SOL. SOL 2
STR PUMP PS
3
4 FUSE-beacon/steering 4 2 G G 3
RIDE CONT. CONT.VALVE BOOM DOWN 3
GW 31
5 MCU-revese sol 5
Y 32 JOY STICK 1
10
GOr
B
4
GOr
B
4
5 5 B
CD-39
Pa
CN-137
CN-136
6 AC CONTROLLER 6 5 2
V 33 4 GOr Pa
7 AC COMP RY 7 CN-83 6 1
CD-41
2
VW 34 BrW
1
28
2
1
8 AC COMP RY OUT 8 2 M
1
2
L 35 G11 B
CAB HARNESS-FRONT MAIN PUMP PS
OR
OR
9 BACK-UP RY OUT 9 1
B
RW 36
10 FUSE-ILLUMINATION 10
EMERGENCY STEERING
OR
LW
AC COND FAN MULTI FUNCTION SWITCH SHIFT LEVER
Or 37
3A
11
2A
11 MULTI-FUNCTION SW -RH CS-79
2
CLUSTER
3
AD7
AS AD6
R AD5
AD4
B3 AD3
B2 AD2
B1 AD1
ROr 38 CN-29
Lo Y 7
12 FUSE-ILLUMINATION 12 Y
B 5
WB 8
32
BG 3
CN-18
BW 2
2
1
1
VM
VP
ED
Y 39 2 Pa 42 W
13 MULTI-FUNCTION SW -LH 13 33 V 2 1 LW LW 6
V
R 40 1 1 CL-3
14 WORK LAMP RY 14
MIRROR HEATED
PROGRAM DUMP
3 1A LW Or 9 15A GW
Br 41 Lo
4 3 2 1 4 3 2 1 4 3 2 1
2 1
R
O
R/DRY
L
ILLUMINATION
R
B V
F
Lo Hi F
3 2 Hi
B+
HIGH BEAM
C
F/R SIGNAL
1
5 14 G
BATT. 24V
SERIAL_H
CD-1
RS232 RX
SERIAL_L
RS232 TX
FRONT WIPER
RH TURN
4
LH TURN
43 Br 45 Or 3 C
6 G32 B
OUTPUT SIGNAL
IG 24V
2
IG 24V
RIDE CONTROL
II
C 4 E
I
O
CN-5
O J
42 B
GND
GND
GND
6
7
2
6 RW W
1
4 BWG C
NC
NC
NC
HEAD LIGHT LH
1 BY C
Hi
1 NC
HO
1
G II
BVi I
R
CN-56
B 42 HYD. TEMP
X1
X2
2 GND-MCU 7E ROr
M
2 CL-24
AD5(R) C
AD6(N) D
A
D
C
AD4(F) B
A
9
2 Gr
6 W
Br 43
4 L
G5 B G2 B
16
14
19
18
17
13
12
10
3 MCU-HYD TEMP
20
15
11
CD-10
9
3
7
8
1
5
4
3
2
BOr 44 BOr 10 1
Y
44 Y
3
5
AD1
AD2
AD3
16
3 E
4 MCU-AIR CLEANER
2 Pf
5 Lo
4
4 Hi
ED1(VP)
Pa SPARE 2
AD7(KD)
V 45 42A B
N
5 MCU-FUEL SENDOR
BrW
5
ROr
ROr
1
COMBI LH
CS-12
CS-11
W
Or
Or
46
W
W
CS-5
G
CS-77
R
B
6
V
TCU-EF2
B
HAZARD SW
V
L
4
5
2
1
3
4
1
3
2
7
6 AIR-CLEANER
CN-21
7 TCU-VMG1 B 47 1 CN-20
2
1
5
3
1
2
8
7
9
7
37A
12A
44 L G11 B
7A
2E
1E
D
15
37
14
13
40
10
11
12
K
8 NC CD-46 CL-23 2 1
BrW
VOr
6
9
4
5
8
GW
LW
YW
GY
40 5 V
Gr
R
Br
Or
W
CN-158
BOr 48 BOr
G
CN-159
48 2
L
9 TCU-VMG2 2 3
X1
X2
9
VOr
1
C
D
D
B
A
B
A
Br 49 49 G2 B
W
Br
G
HORN
B
10 TCU-EF4 10 2 1 4
16
22
23
24
25
17
18
19
20
38
21
L 50 50 L CN-25
3
2
1
10
11 3 G12
G1
CS-41
B
GrW
26
27
38
28
B 41A GrW
RW
51
VOr
LW
12 TCU-VMG1 12 CL-22 6 1
Br
W
SPEED SENSOR OUTPUT
10
5A
3
L
2
6
1
4
5
8
9
W 52 40A R 2
13 TCU-EF3 13 CD-47(BLACK) 2 7 6 2
51 B G3 B
14 NC 8
36
29
30
31
32
33
34
35
14 1
ROr
BrW
BrW
2 7F ROr CL-4
CN-9
Or
15 NC 15 52 W WORK LAMP LH 9
Y
1 G4 B GOr 1 15 GW
10 10 9 1 MCU 1 1 Lo
INTER GEAR PICK-UP CL-21 G 2 12 V
G2
1A
2A
3A
3E
36A RW 2 2 Hi
7
11 TCU-AIP4 V 56 WOr 9
6
G1
11
16
17
18
19
20
21
22
GW 23
24
25
6A
10
37
40
ROr 11
W 12
26
27
28
VOr 29
LW 30
31
32
33
GrW 34
35
36
45
44
GW 43
GrW 41
42
BrW 3
2
1
G3 B
4
ROr 7
RW
Gr 63
G
LW
1
R
GY
FUSE
B
Or
1 1 B
Gr
Or
Or
13 TCU-AIP1
Br
W
B
V
B
Y
W
Br
ATT.UNLOCK SW
W
W
L
13 CL-16
V
G
R
L
L
L
14 TCU-VPS1 3 E
CN-16
14 C
CN-17
4
CN-15
CN-163
Or B G1 8 Br
15 TCU-AIP2 YW 65 CD-49 37 3 GND 3 4 S
4
3
1
2
15
10
13
10
10
12
15
12
15
14
13
12
T
11
11
14
11
3
7
6
5
4
3
2
1
7
6
5
4
3
2
1
9
9
8
9
8
7
6
5
4
3
2
1
6
5
4
3
2
1
G4 B 4 GND 4
57 BOr
C 2 E B G21
BOOM KICK OUT
1 41 Br 5 GND 5
1 S ROr 13
TEMP CONVERTER 6 ILLUMINATION(FUSE) 6
MULTI-FUNCTION SW(Hi-BEAM)
RW 14 CN-101
CN-112 REAR COMBI RH 7 ILLUMINATION(FUSE) 7
TM CONTROLER(ED4-FWD)
11A R
TM CONTROLER(ED6-NEU)
15
TM CONTROLER(ED5-REV)
8 MULTIFUNCTION SW GW
CL-15 8 1 B
16 Y 16 G22 B
58 BOr 38
MCU&FRONT WASHER
ROr 9 MULTIFUNCTION SW 9 3 E
TM CONTROLER(ED1)
TM CONTROLER(ED2)
TM CONTROLER(ED3)
C
MIROR HEATED CON.
4
FUSE BOX(BATT 24V)
9 TEMP
TM CONTROLER(KD)
53 BW MULTIFUNCTION SW Or 17 7 G
39 Y 10 10 4 S
TM CONT.(ERROR)
8 TEMP 3 T
FLASHER UNIT(L)
ATT.UNLOCK SOL
W
DESTINATION
DESTINATION
64 G6 B 11 GND TM
ELEC.STEERING
WIPER RY-Hi&Lo
VPS1(+) 2 E
MCU(SERAL-H)
7
HEAD LAMP-Lo
MCU(SERAL-L)
HEAD LAMP-Hi
ILLUMINATION
Or 17
ATT.LOCK SOL
MCU (INT SIG)
FUSE BOX(IG)
Br 12
WIPER RY-Lo
WIPER RY-Lo
1 2 3 4 1 2 3 12
WIPER RY-Hi
WIPER RY-Hi
6 Y6 1 S
60 LW
FUSE BOX
FUSE BOX
FUSE BOX
Y5 13 NC 13
LIGHT SW
FUSE BOX
F/R LAMP
HORN RY
5 Y5
G21
G11
V B G31
G1
61 Y2 14 GND 14
73
REAR COMBI LH
72
4 Y4 Y3
GND
GND
62 OrW 15 NC 15
NC
NC
NC
NC
NC
3 Y3 NC
NC
NC
Y6
65 YW
2 Y2 Y4
63 Gr
1 Y1 Y1 FRONT HARNESS
12
11
10
15
14
13
12
11
10
15
14
13
12
11
10
NO.
NO.
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
6
5
4
3
2
1
GEARBOX EARTH1
TRANSMISSION
7607AEL01
7-4
MEMORANDUM
7-5
1. ILLUMINATION CIRCUIT
1) OPERATING FLOW
Fuse box (No.2) Illumination switch [CS-21(1)] Switch ON, 1st step
[CS-21(7)] All switch indicator lamp ON
[CS-21(5)] Fuse box(27) I/conn [CN-4(12)] LH Combi clearance lamp ON [CL-15(4)]
I/conn [CN-10(6)] RH Head lamp ON [CL-4(3)]
I/conn [CN-15(10)] Cluster [CN-56(17)] All cluster gauge and
LCD lamp ON
Hazard switch indicator lamp ON
Fuse box(28) I/conn [CN-4(10) Number plate lamp ON [CL-21(2)]
RH Combi clearance lamp ON [CL-16(4)]
I/conn [CN-10(7)] LH Head lamp ON [CL-3(3)]
2) CHECK POINT
Engine Key switch Check point Voltage
7-6
ILLUMINATION CIRCUIT
FUSE BOX
BEACON/RR WORKLAMP 20A
1
10 OrW ILL.LAMP 20A
2
HEAD LAMP 20A
3
BACK/STOP LAMP 10A
4
24
CLUSTER 10A
25
CASSETTE 10A
26
7 ROr ILLUMINATION LAMP 5A
27
6 RW ILLUMINATION LAMP 5A
28
CN-36
R 35
LH HEAD LIGHT
3 1 Lo
1 2 Hi
14 G
2 3 C
G32 B
3 4 E
2 4 CL-3
5
ILL & HEAD LAMP SW 7A ROr ROr 13
6
B G35 6A RW RW 14
9 10 10 R 1H
7 RH HEAD LIGHT
9 8 3 1 Lo
4 8 9 2 Hi
2 R 1 13 ROr
7 10 3 C
7 G31 B
1 6 11 4 E
5 R 35
5 12 CL-4
4 13
3
B G31 NUMBERPLATE LAMP
3 14 36A RW
II I 0
2 2
15 G1 B
OrW 10 1
1 CN-10
CS-21 CL-21
3
1
1 2 RH COMBI REAR
3 36 RW
4 C
4
3 T
5 G4 B
2 E
6
ALL SWITCH INDICATOR LAMP ON 1 S
7
CL-16
8
6 RW
9
RW 36 3 LH COMBI REAR
10
38 ROr
11 4 C
7 ROr ROr 38
12 3 T
G6 B
13 2 E
14 1 S
CN-4 CL-15
CLUSTER
20 RS232 RX
12 19 GND
11 18 NC
7E ROr 7A ROr
10 17 ILLUMINATION
9 16 F/R SIGNAL
8 15 SERIAL-L
14 SERIAL-H
7
4 6
13 NC
12 GND
5 11 GND
4 10 RS232 TX
9 PROGRAM DUMP
3
8 NC
2 7 MIRROR HEATED
1 6 HIGH BEAM
CN-15 5 RH TURN
10 10 7 ROr
4 LH.TURN
3 BATT 24V
2 IG 24V
CS-41
1 IG 24V
9
8
6 7
6
5 5
4
3
2
1
CN-56
8
2
7
1
9
HAZARD SW
7607AEL03
7-7
2. HEAD LIGHT CIRCUIT
1) OPERATING FLOW
Fuse box(No.3) Head light switch [CS-21(4)] Light switch ON, 2nd step [CS-21(2)]
I/conn [CN-16(7)] Multi function switch [CS-11(8)]
Multi function switch MIDDLE [CS-11(7)] I/conn [CN-16(6)] I/conn [CN-10(8)]
LH Head light low beam ON [CL-3(1)]
RH Head light low beam ON [CL-4(1)]
Multi function switch DOWN [CS-11(6)] I/conn [CN-16(5)]
I/conn [CN-10(2)]
LH Head light high beam ON [CL-3(2)]
RH Head light high beam ON [CL-4(2)]
I/conn [CN-15(7)]
Cluster high beam pilot lamp ON [CN-56(6)]
2) CHECK POINT
Engine Key switch Check point Voltage
7-8
HEAD LIGHT CIRCUIT
FUSE BOX
BEACON/RR WORK LAMP 20A
1
ILL.LAMP 20A
2
11 YW HEAD LAMP 20A
3
BACK/STOP LAMP 10A
4
24
TCU 10A
25
CLUSTER 10A
26
ILLUMINATION LAMP 5A
27
ILLUMINATION LAMP 5A
28
CN-36
LH HEAD LIGHT
15A GW
1 Lo
7 12A V
2 Hi
3 C
ILL & HEAD LAMP SW 1 G32 B
68 V V 12 4 E
2
9 10 10 1
9 3 CL-3
4 8 4
2 RH HEAD LIGHT
7 5 6 15 GW
1 Lo
7 1 6 6 12 V
5 2 Hi
5 7
11 YW GW 15 3 C
4 8 G31 B
134 GW 4 E
11E YW
3 9
161 W
II I 0
2 13 CL-4
1 B G31
14
CS-21 15
CN-10
2
CLUSTER
20 RS232 RX
19 GND
CN-16
18 NC
1
2
3
4
5
6
7
8
9
17 ILLUMINATION
16 F/R SIGNAL
15 SERIAL-L
14 SERIAL-H
13 NC
12 12 GND
11 11 GND
10 10 RS232 TX
9 PROGRAM DUMP
9 8 NC
68A V 8 7 MIRROR HEATED
10 V
7 6 HIGH BEAM
6 5 RH TURN
5 4 LH.TURN
3 BATT 24V
4 2 IG 24V
4 3 1 IG 24V
4 2
GW
YW
CN-56
W
3 1
5
25
22
23
24
CN-15
8
CS-11
5
8
4
7
3
2
1
BWG 4
W6
Hi
C
Lo
Hi
B+
C
F
R
L
O
R
L
7 Y Lo
2 BW
8 WB
3 BG
5B
MULTI FUNCTION SW
7707AEL04
7-9
3. WORK LIGHT SWITCH
1) OPERATING FLOW
※ Illumination switch : ON position
(1) Work lamp switch ON (1st step)
ILL & head lamp switch [CS-21(7)] Work lamp switch indicate lamp ON
Work lamp switch [CS-36(1)→(7)]
Front work lamp relay[CR-3(30)→(87)] I/conn [CN-7(2)]
RH Front work lamp ON [CL-5(2)]
LH Front work lamp ON [CL-6(2)]
(2) Work lamp switch (2nd step)
Work lamp switch [CS-36(4)→(2)] Rear work lamp relay [CR-55(30)→(87)]
I/conn [CN-4(14)] LH Rear work lamp ON [CL-22(2)]
RH Rear work lamp ON [CN-23(2)]
2) CHECK POINT
Engine Key switch Check point Voltage
7-10
WORK LIGHT SWITCH
FUSE BOX
5 G BEACON/RR WORK LAMP 20A
1
10 OrW ILL.LAMP 20A
2
HEAD LAMP 20A
3
BACK/STOP LAMP 10A
4
HORN/CONVERTER 30A
5
AIR-CON/HEATER 30A
6
CIGAR LIGHTER/MIRROR 30A
7
SWITCH 30A
8
WIPER 20A
9
15 Gr FR WORK LAMP 30A
10
EMER STEER/RIDE CON 20A
11
CN-36
OPT
FRONT WORK LAMP
RW 2F
2
B G24
1
CL-36
FRONT WORK LAMP
RW 2E
2
B G23
1
2 CL-35
FR WORK LAMP RY 1 RW 2 FRONT WORK
86 30 87a 2 LAMP,LH
B G16 3 RW 2A
85 2
RW 171 4 B G22
87 1
G 170 5 CL-6
85 87 87a
86
Gr 15 6 3
30 7 FRONT WORK
B G21
CR-3 8 LAMP,RH
RW 2
2
1 9
10
B G21
1
11 CL-5
12 OPT
13 REAR WORK LAMP
R 10 R 10
14 2
B G25
15 1
2 CN-7 CL-32
RR WORK LAMP RY REAR WORK LAMP
86 30 87a R 10A 2
B G17 1 B G26
85 2 1
R 63
87 3 CL-33
L 180
86 4
85 87 87a Gr 5 REAR WORK
30 5
LAMP,LH
CR-55 6 40A R
7 2
G3 B
1 8 1
WORK LAMP SW 9 CL-22
B G36 10
9 10 10
9 R 1G 11 4
4 8 12 REAR WORK
2 G 170 13 LAMP,RH
7 R 40 40 R
14 2
7 1 6 G2 B
15 1
5 5
R 1F CN-4 CL-23
4
G1
3
L 180
II I 0
2
1 R 1E
CS-36 EARTH 1
CS-21
9 10 10
9
4 8
2 R 1
7
7 1 6
5 5
4
3
II I 0
2
OrW 10
1
ILL & HEAD LAMP SW : ON(1st step)
7807AEL5
7-11
4. STARTING CIRCUIT
1) OPERATING FLOW
Battery(+) terminal Fusible link [CN-60(1)→(2)] Master switch [CS-74]
I/conn [CN-1(1)] Fuse box (No.15) Start switch [CS-2(1)]
ECM power relay [CR-25(30)]
Power relay [CR-35(30)]
※ The gear selector lever is neutral position. It is necessary condition before the starting.
The gear selector has an output signal which is activated whenever the shift lever is in the neutral
position. This signal can be used to control a relay and prevent engine from starting whenever the shift
lever is not in the neutral position.
(1) When start key switch is in ON position
Start switch ON Start switch [CS-2(2)] I/conn [CN-3(9)] Battery relay [CR-1]
Battery relay operating(All power is supplied with the electric component)
Start switch [CS-2(3)] ECM power relay [CR-25(30)→(87)] Fuse box[No.21]
I/conn [CN-2(6)] I/conn [CN-12(10)]
ECM port 50P[CN-93(39)]
Power relay[CR-35(30)→(87)] Fuse box[No.23]
MCU[CN-58(12)]
(2) When start key switch is in START position
Start switch START [CS-2(5)] Start safety relay [CR-5(30)→(87)] I/conn [CN-3(4)]
[CN-13(7)] Start relay [CR-23(2)] Starter(Terminal B and M connector of start motor)
+
2) CHECK POINT
7-12
STARTING CIRCUIT
FAN CLUTCH +
CLUTCH CUT-OFF PS
SAFETY RY
BUZZER
COOLANT TEMP
WIPER RY
STEERING RY
ALT LEVEL
FUEL SENSOR
PREHEATER
SERIAL-H
NEUTRAL SIG
FAN CLUTCH -
ADM2-JOYSTICK SELECT LAMP(-)
ELEC STEERING
ADM5-JOYSTICK SELLECTER(+)
CLUTCH CUT-OFF SW
SERIAL-L
GND
AUTO SEL.SW
ADM1-START INTERLOCK RY(-)
AIR FILTER
IG 24V
BUZZER
CN-26
ED2-SHIFT LEVER X1B-B2
VPE2-CONTINUANCE 24V
FUSE BOX
ED14-NEU-JOYSTICK
ED13-REV-JOYSTICK
ED8-FWD-JOYSTICK
2
1
10
EMER STEER/RIDE CON 20A
27A RW
115 W
11
17 G NEUTRAL RY/JOYSTICK F/R 10A
12
PREHEATER 30A
22
21
23
35
34
24
36
31
26
25
32
33
27
30
29
28
11
12
10
13
14
NEUTRAL RY 13
X-1 G 17 TURN LAMP
30 14
65
85 W 66
67
68
44
31
30
52
59
115 W
VM OUTPUT SIGNAL A
5
7
27 RW
K CN-58
73 BOr
G 17A 85 3R 34
86 87a 87
CASSETTE/ROOM LAMP 5A
VP F B N D B CN-157 15
C BOr 73 21 3Or START KEY 30A
ED 1 2 3 4 1 2 3 4 1 2 3 4 87 16
AD1 B1 D BOr 88 TCU 10A
AD2 B2
85 17
CN-158 ECM 10A
AD3 B3 87a 30 86 18
AD4 V X-2 CR-38 CLUSTER/MCU 10A
19
AD5 R A 1 AC & HEATER 20A
SAFETY RY 20
AD6 AS B 2 GrW 157
30 26 WOr ECM 10A
AD7 C 3 21
85
86 87a 87
W 33 BOr 73A RCV
A AD3 D 4 10A
BW 151 22
B AD2 CN-159 5 87 27 RW MCU 10A
Or 104 23
C AD1 6 85 10A
TCU
D AD7(KD) 7 24
X1 87a 30 86 CLUSTER 10A
8 25
A ED1(VP) 9 7 CR-5 CASSETTE 10A
26
D AD6 10 ILLUMINATION LAMP 5A
B AD4 27
11 5A
ILLUMINATION LAMP
C AD5 12 28
X2
13
14 CN-36
CN-17 MASTER SW
34 3R 1 3R
1 2
2 1
CS-74 FUSIBLE LINK
CN-1 2 5W CN-60
2
69 5W
1
2
BATTERY
BATT RY CN-95
66 G
G12 B
CR-1
1 1
2 STARTER
3 B+
BW 18
4 G 66A
5 2
B G13
6 1 M
7 DO-2 CN-45
G 66
8 2
L 22 L 22 START RY
9 1
21E Or
153 L
157 GrW
65 G
DO-1 G1 B
8 4 10
17 BW
1
11 2
5
12 5
6 3 13
6 CR-23
7
21 3Or
14
G14 B
31 3Br
65A G
G15 B
32 3Y
65 G
21A Or
CS-2
15 8
5
4
1
6
2
3
9 ECM
CN-3
46 J1939 (+)
CR-35
CR-25
87a 85 87 86 30 87a 85 87 86 30 B 10
0, I 47 J1939 (-)
1
11
87a 87a 9 37 J1939 SHIELD
12
30 87 30 87 4 10 40 AIR-HEATER OUTPUT
86 86 CN-13
85 85
H 0 I II
5 11 42 AIR-HEATER RETURN
4
6
5
3
2
8 WOr 12 Wor
C ST ACC BR
H
6 12 39 POWER IG
POWER RY ECM POWER RY START SWITCH 7 13 00 00
8 14 CN-93
9 15
10 CN-12
11
12
CN-2
7607AEL06
7-13
5. CHARGING CIRCUIT
When the starter is activated and the engine is started, the operator releases the key switch to the ON
position.
Charging current generated by operating alternator flows into the battery through the battery
relay(CR-1).
The current also flows from alternator to each electrical component and controller through the fuse
box.
1) OPERATING FLOW
(1) Warning flow
Altermator [CN-74(2)] I/conn [CN-13(8)] I/conn [CN-3(5)] MCU[CN-58(25)]
Cluster charge warning lamp ON
(2) Charging flow
Alternator Starter [CN-45(B+)] Battery relay [CR-1]
Battery(+) terminal Charging
Fusible link [CN-95(1)→(2)] I/conn [CN-1(2)] Fuse box
2) CHECK POINT
Engine Key switch Check point Voltage
① - GND (Battery)
② - GND (Battery relay)
③ - GND (ALT B+)
Running ON 20~28V
④ - GND (ALT 2)
⑤ - GND (MCU)
⑥ - GND (Fuse box)
※ GND : Ground
7-14
CHARGING CIRCUIT
FUSE BOX
BEACON/RR WORK LAMP 20A
1
ILL.LAMP 20A
2
HEAD LAMP 20A
3
BACK/STOP LAMP 10A
4
HORN/CONVERTER 30A
5
AIR-CON/HEATER 30A
6
CIGAR/MIRROR 30A
7 MASTER SW
SWITCH 30A
8 1 3R
WIPER 20A 34 3R 2
9
1
33 5W
FR WORK LAMP 30A 2 1
10 FUSIBLE LINK
EMER STEER/RIDE CON 20A CN-1 CS-74 CN-60
2 5W
11 2
NEUTRAL RY/JOYSTICK F/R 10A 69 5W
12 1
PREHEATER 30A
13
6 CN-95
BATTERY
TURN LAMP 20A
BATT RY
14
CASSETTE/ROOM LAMP 5A
15
START KEY 30A
16
TCU 10A
17 CR-1 1
CN-36 2
STARTER
M
MCU
B+
HYD TEMP SENDER
CLUTCH CUT-OFF PS
SPEEDMETER SIG.
COOLANT TEMP
BUZZER STOP
ELEC STEERING
WIPER RY
STEERING RY
ALT LEVEL
FUEL SENSOR
TACHO SENSOR+
PREHEATER
SERIAL-H
MAIN PUMP PS
WASH SIG
NEUTRAL SIG
CAN-H
AUTO SEL.TCU
CAN-L
CLUTCH CUT-OFF SW
STEERING P/P PS
RIDE CONT. ON
WIPER INT SIG
PARKING SIG
SERIAL-L
GND
BUZZER
AUTO SEL.SW
FAN CLUTCH +
BRAKE PS
TAHCO SENSOR -
AIR FILTER
CN-45
IG 24V
FAN CLUTCH -
23
35
34
24
36
31
26
32
25
33
27
21
20
30
29
28
22
17
19
11
18
16
12
10
13
15
14
1
2
3
6
8
4
5
7
9
CN-58
112 YW
1
2
3
1 4
2 5
3 6
22 R
4 7 2
112 YW 19 YW YW 18 18A YW 3W/300
5 8 1
6 RS-1
9
7 10 15 R CN-74
8 11 22 R
B+
9 12 G
18 YW
3 1 P
3~
10 CN-13 2 L
11 3 FI U
12 4 NC
4
13 ALTERNATOR
14
15
CN-3
7607AEL07
7-15
6. ELECTRIC PARKING, DECLUTCH CIRCUIT
1) OPERATING FLOW
(1) Parking OFF
Fuse box (No.8) Parking switch OFF [CS-17(6)→(8)] Parking solenoid ON (Activated)
Parking brake released (By hydraulic pressure)
(2) Parking ON
Fuse box (No.8) Parking switch ON Parking solenoid [CN-71] OFF
Parking brake applied [By spring force]
[CS-17(5)→(7)] T/M control unit [CN-157(21)]
T/M declutch
(3) Declutch ON
Fuse box (No.8) Clutch cut-off switch ON Clutch cut-off switch [CS-42(5)→(1)]
MCU [CN-58(10)→(29)] Service brake applied Service brake pressure switch
ON [CD-5] T/M control unit [CN-157(66)] Declutch
2) CHECK POINT
Engine Key switch Check point Voltage
7-16
5
7
2
9
9
9
8
8
7
2
7
2
1
1
II I 0
6
6
PARKING SW
5
5
4
1
2
3
4
5
1 6
7
4 8
9
10 10
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
10 10
10 10
CS-17
CS-42
CLUTCH CUT-OFF SW
R 1
R 1N
3
OrW 10
R 1R
2
B G38
Y 127
B G34
YW 50
WOr 3A
FUSE BOX[CN-36(2)]
WOr 3F
WOr 3E
OrW 119
ILL & HEAD LAMP SW : ON(1st step)
1
19 EF1-SPEED PICK-UP ENG
20 ED3-SHIFT LEVER-X1A-B3
50 YW
21 ED10-PARKING BRAKE SW(+)
22 ED7-SHIFT LEVER-X1D-KD
23 VPE1-CONTINUANCE 24V
25 CANF_H
T/M CONTROL UNIT
26 CANF_L
27 CANF_T
28 VGS-CAN SHIELD
7-17
ELECTRIC PARKING, DECLUTCH CIRCUIT
B G25 84 Gr
66 ED9-CLUTCH CUT-OFF SW(+)
1 2
PARK
Y 127
67 ED6-SHIFT LEVER X2D-NEU
SOLENOID
CN-157
68 VPE2-CONTINUANCE 24V
5
CD-26 NEUTRAL SIG
MCU
SAFETY RY
CN-58
2
Pa 70E B PREHEATER
1 WIPER RY
125 V
STEERING RY
PARK PS
CD-5 SERIAL-H
109 G SERIAL-L
2
CLUTCH CUT-OFF PS
Pa G 109
36 35 34 33 32 31 30 29 28
1 FUEL SENSOR
Gr B4
CLUTCH
CUT-OFF
119 OrW AUTO SEL.SW
CLUTCH CUT-OFF SW
6
TACHO +
3 WOr
11 10 9 8
CN-36
WIPER
WASH SIG
SWITCH
ILL.LAMP
7 6 5 4
FUSE BOX
BUZZER STOP
3
HEAD LAMP
BRAKE PS
AIR-CON/HEATER
BACK/STOP LAMP
HORN/CONVERTER
10A
10A
10A
30A
20A
20A
20A
20A
BEACON/RR WORK LAMP 20A
7807AEL08
2
1
7
3
9
8
4
6
5
7. WIPER AND WASHER CIRCUIT
1) OPERATING FLOW
Fuse box (No.9) Wiper relay [CR-4(30)→(87a)] I/conn [CN-17(9)]
Front wiper motor [CN-21(1)]
Wiper relay Lo [CR-26(86), (87)]
I/conn [CN-16(8)] Multi function switch [CS-12(6)]
I/conn [CN-8(1)] Rear wiper & washer switch [CS-35(1)]
Rear wiper motor [CN-102(1)]
(1) Front washer switch ON
① Washer switch ON [CS-12(6)→(2)] Washer tank [CN-16(12)] Washer operating
MCU [CN-58(5)→(33)] Front wiper relay Lo
[CR-26(87)→(30)] I/conn [CN-17(13)]
Front wiper motor [CN-21(5)] Wiper motor operating(Low)
(2) Front wiper switch ON
① INT position
Wiper switch ON [CS-12(6)→(1)] I/conn [CN-16(13)] MCU [CN-58(8)→(33)]
Wiper relay Lo [CR-26(87)→(30)] I/conn [CN-17(13)] Front wiper motor [CN-21(5)]
Front wiper motor intermittently operating
② Lo position
Wiper switch ON [CS-12(6)→(4)] I/conn [CN-16(10)] Wiper relay Lo [CR-26(87a)→(30)]
I/conn [CN-17(13)] Front wiper motor [CN-21(5)] Front wiper motor operating (Low)
③ Hi position
Wiper switch ON [CS-12(6)→(3)] I/conn [CN-16(11)] Wiper relay Hi [CR-4(30)→(87)]
I/conn [CN-17(12)] Front wiper motor [CN-21(4)] Front wiper motor operating(High)
(3) Auto-parking(When switch OFF)
Switch OFF Fuse box (No.9) Wiper relay Hi [CR-4(30)→(87a)] I/conn [CN-17(9)]
Front wiper motor [CN-21(1)→(2)] Multi function switch [CS-12(5)→(4)] I/conn [CN-16(10)]
Wiper relay Lo [CR-26(87a)→(30)] I/conn [CN-17(13)] Front wiper motor [CN-21(5)]
Wiper motor stop
(4) Rear wiper and washer switch
① Wiper switch ON(1st step)
Wiper switch ON [CS-35(1)→(6)] I/conn [CN-8(4)] Rear wiper motor [CN-102(5)]
Rear wiper motor operating
② Washer switch ON(2nd step)
Washer switch ON [CS-35(1)→(3)] I/conn [CN-8(2)] Rear washer tank [CN-103(2)]
Washer operating
2) CHECK POINT
① - GND (Front wiper switch power input) ⑥ - GND (Wiper relay power input)
Engine : Stop ② - GND (Rear wiper switch power input) ⑦ - GND (Front washer power output)
Key switch : ON ③ - GND (Wiper relay power input) ⑧ - GND (Rear washer power output)
Voltage : 20~25V ④ - GND (Front wiper motor Lo power input) ⑨ - GND (Front wiper motor power output)
⑤ - GND (Front wiper motor High power input) ⑩ - GND (Rear wiper motor power output)
※ GND : Ground
7-18
CS-35
B G8
9 10 10 1
9 2
W 15
3 8 3
7 4 6 5 Lo M
8 Or 16 5 Or 164
6 6 5 4 Hi
1 6 4
5 7 B G4
3 1B
10
4 8 W 165
0,I
V 14 2 2Pf
3 L 14E
REAR WIPER
CN-8 1 3E
2 CN-102
WIPER AND WASHER CIRCUIT
L 13
II I 0
8
2
36 NEUTRAL SIG
MCU
35 SAFETY RY
34 PREHEATER
105 GOr
33 WIPER RY
32 STEERING RY
CN-22 31 SERIAL-H
B G2
M 1 30 SERIAL-L
Gr 69
2 29 CLUTCH CUT-OFF PS
28 FUEL SENSOR
FRONT WASHER
27 HYD TEMP SENDER
CN-103 26 COOLANT TEMP
B G3
M 1 25 ALT LEVEL
V 166
2 24 FAN CLUTCH -
23 FAN CLUTCH +
22 GND
21
REAR WASHER
BUZZER
20 SPEEDMETER SIG.
19 CAN-L
18 CAN-H
17 AUTO SEL.TCU
16 TAHCO SENSOR -
15 MAIN PUMP PS
14 ELEC STEERING
13 AIR FILTER
12 IG 24V
11 AUTO SEL.SW
10 CLUTCH CUT-OFF SW
8 9 TACHO SENSOR+
120 LW
Hi 7 8 WIPER INT SIG
F Lo
6 7 RIDE CONT. ON
L 6 RIDE CONT. AUTO
O 5 69A G
R 5 WASH SIG
4
5B 4 BUZZER STOP
B+ 3
3 STEERING P/P PS
2 2 PARKING SIG
7-19
1 1 BRAKE PS
CN-58
7 Y Lo W6
Hi
2 BW L
BWG 4
3 BG C
R
II
1
9
I
0
6
J 0 G 5
CS-12 7
II BVi 3 L 21 14F L
6 8
I L 4 VOr 38
5 9
G 20 162 G
4 10
J BY 1 Br 19 163 Br
3 11
C RW 6 Gr 18 69 Gr
2 12
W Gr 2 LW 17 120 LW
1 13
14
HO Y 15
CN-16
CS-5
7
14 L
1
2
3
4
WIPER
SWITCH
ILL.LAMP
5
FUSE BOX
6
HEAD LAMP
7
CIGAR/MIRROR
CN-21
FR WORK LAMP
28 W 8 8 W
AIR-CON/HEATER
BACK/STOP LAMP
3E 1 9
HORN/CONVERTER
38 VOr
2Pf 2 10 G61 B
G1 B
1B 3 11
30A
10A
20A
30A
20A
30A
30A
20A
27 G
30A
BEACON/RR WORK LAMP 20A
172 G
4 26 R 12
173 R
2
1
7
3
9
8
4
6
5
10
4 Hi 5 13
CN-36
FRONT WIPER
M
5 Lo 6 14
CN-17
5
8 W
8A W
173 R
162 G
6
105 GOr
14A L
BE W
172 G
G13 B
163 Br
4
3
85
87
86
30
85
87
86
30
87a
CR-4
87a
CR-26
30 86
30 86
87a 87 85
87a 87 85
WIPER RY LO
WIPER RY HI
7707AEL09
HAZARD, TURN AND ROTARY CIRCUIT
1
2
3 1
4 REAR COMBI RH 2
5 3
4 C
6 37 Or 4 BEACON LAMP
3 T 22 GY
7 G4 B 5
2 E G1 B FUSE BOX
8 1 S 6 5 G BEACON/RR WORK LAMP 20A
ILL & HEAD LAMP 1
9 CL-16
SW : ON(1st step)
7 CL-7 ILL. LAMP 20A
10 8 2
66A Or HEAD LAMP 20A
11 REAR COMBI LH 9 3
BACK/STOP LAMP 10A
12 4 C 10 4
67A Y 39 Y HORN/CONVERTER 30A
13 3 T 11 5
G6 B
14 2 E 12 AIR-CON/HEATER 30A
6
CN-4 1 S
13 CIGAR/MIRROR 30A
CL-15 7
14 SWITCH 30A
8
15 WIPER 20A
CN-7 9
FR WORK LAMP 30A
10
EMER STEER/RIDE CON 20A
11
NEUTRAL RY/JOYSTICK F/R 5A
12
PREHEATER 30A
13
TURN LAMP 20A
14
1 RADIO/ROOM LAMP 5A
15
2 START KEY 30A
3 FLASHER UNIT 16
BrW 158 TCU 10A
4 1 L 17
R 19
5 2 B G CN-36
6 B G51
3 E
CN-16
CLUSTER
7
6
5
4
3
2
1
7 CR-11
8 20 RS232 RX
19 GND
9 18 NC
ILL & HEAD LAMP 7A ROr
10 17 ILLUMINATION
SW : ON(1st step) 16
11 F/R SIGNAL
15 SERIAL-L
12 14 SERIAL-H
CN-15 13 NC
12 GND
11 GND
10 RS232 TX
9 PROGRAM DUMP
8 NC
7 MIRROR HEATED
2E Or 6 HIGH BEAM
5 RH TURN
4 LH.TURN
1E Y 3 BATT 24V
2 IG 24V
1 IG 24V
CN-56
1
2 COMBI LH
G2 B
3 1
3 BrW
16 Y
2 Or
4 2
1 Y
5 CL-24
CS-12
CS-11
CS-5
6
6
5
4
3
2
1
8
7
6
5
4
3
2
1
7
8 COMBI RH
67 Y G3 B
BWG 4
1
RW 6
W6
9
BVi 3
L 4
G 5
BY 1
Gr 2
66 Or 17 Or
3E BrW
3A BrW
10 2
Y
22 GY
7 ROr
2A Or
G2 B
G7 B
7H R
1A Y
11 CL-25
9 G
HO
12
W
II
I
Hi
C
J 0
J
C CN-10
0
II
CS-41
I
CS-23
Lo
10 10
10
9
8
7
6
5
4
3
2
1
9
8
7
6
5
4
3
2
1
Hi
B+
F
10
5
6
R
L
O
R
L
7 Y Lo
8 WB
2 BW
3 BG
5B
9
8
2
7
1
8
2
7
1
7607AEL10
7-20
GROUP 3 MONITORING SYSTEM
1. CLUSTER
The gauges panel consists of gauges and monitors as shown below, to warn the operator in case of
abnormal machine operation or conditions for the appropriate operation and inspection.
· Gauges : Indicate operating status of the machine.
· Warning lamp : Indicate abnormality of the machine.
· Pilot lamp : Indicate operating status of the machine.
※ The monitor installed on this machine does not entirely guarantee the condition of the
machine. Daily inspection should be performed according to chapter 6, MAINTENANCE.
※ When the monitor provides a warning immediately check the problem, and perform the
required action.
LCD
mph
Km/h
Select(Enter) key
1) SPEEDOMETER
(1) The speedometer displays the speed of machine in mph and
km/h.
mph
7807A3CD03
7-21
2) FUEL GAUGE
(1) This gauge indicates the amount of fuel in the fuel tank.
(2) Fill the fuel when the indicator moves E point, refuel as soon as
possible to avoid running out of fuel.
※ If the gauge indicates below E point even though the
machine is on the normal condition, check the electric device
7807A3CD04 as that can be caused by the poor connection of electricity or
sensor.
Operating
(3) If the indicator is in the red range, turn OFF the engine, check the
range 7807A3CD05 radiator and engine.
Operating (3) If the indicator is in the red range, it means the transmission is
range 7807A3CD06 overheated. Be careful that the indicator does not move into the
red range.
Operating (3) If the indicator is in the red range, reduce the load on the system.
range 7807A3CD08 If the gauge stays in the red range, stop the machine and check
the cause of the problem.
7-22
7) WARNING LAMP
(1) When all warning lamp or fault codes are being displayed, this
warning lamp will flash.
(2) When this warning lamp flashes, machine must be checked or
serviced as soon as possible.
77073CD09
77073CD10
7807A3CD11
77073CD12
77073CD13
7-23
12) PREHEATER PILOT LAMP
(1) This lamp lights ON when start switch is turned clockwise to the
ON position. Light will turn off after approximately 5~45 seconds,
depending on engine temperature, indicating that preheating is
completed.
(2) When the lamp goes out the operator should start cranking the
77073CD14 engine.
77073CD65
77073CD16
77073CD17
77073CD18
7-24
17) TRANSMISSION ERROR WARNING LAMP
(1) This lamp lights ON and the LCD display show the error codes when
an error occurs in the transmission.
(2) Immediately pull the machine to a convenient stop. Stop the
engine. Investigate the cause.
※ Consult a HYUNDAI dealer to investigate the cause.
77073CD19
※ Do not operate until the cause has been corrected.
77073CD20
77073CD21
77073CD22
77073CD23
7-25
22) FNR SELECT PILOT LAMP(Option)
(1) The lamp comes ON when FNR select button on the optional
FNR remote control lever is pressed.
7807A3CD24
(2) Emergency
This lamp indicates the emergency steering system is active.
※ Immediately pull the machine to a convenient stop and
stop the engine.
※ The emergency steering system can be manually tested.
77073CD15
Refer to page 7-36.
77073CD40
77073CD41
7-26
26) LCD
1 LCD
2( ) Right, Buzzer stop
Move to the next selection
1
3( ) Select(Enter)
Activate the currently chosen item
2 4( ) Escape
3 Return to the previous menu
4 5( ) Main, Menu
5 - Display menu
7707A3CD04
- Return to the main display
2
TYPE 1 TYPE 2
1
4
c
a
3 e 5
b
d
7
6
8 9
7707A3CD10
7-27
(2) Display map
7707A3CD11
1
·Alarm setting. It is possible to set 3 alarms.
Alarm 2
·Stop alarming :
3
User Alternate ON ·Raise the idle rpm to 1200rpm automatically
-
idle OFF to warm up the engine.
7-28
Main group Sub group Meaning Display on LCD
Adjustment MKS Total 50.7 Km
Unit ·Choose between metric and inch unit display.
ENG Total 31.5 Mile
Wiper ·When using the intermittent function of wiper
Intermittence motor, it regulates operation time.
·Regulate idle rpm.
Alternate RPM ·Press : Adjust idle rpm increments -
(or decrement) by 25rpm.
7-29
(3) Machine fault code
When selecting the fault code menu, it shows all of the fault codes which mean abnormal
conditions of present time.
3 's FAULT 71
34 71 72 TCU Communication Error
7707A3CD36
7-30
(4) Transmission warning
7-31
(5) Display during AEB mode
7-32
2. SWITCHES
LH Side
Front
A
Hazard switch
Kick down switch
7707A3CD29
1) STARTING SWITCH
(1) There are three positions, OFF, ON and START.
· (OFF) : None of electrical circuits activate.
· (ON) : All the systems of machine operate.
· (START) : Use when starting the engine.
Release key immediately after starting.
※ Key must be in the ON position with engine running maintain
77073CD41
electrical and hydraulic function and prevent serious machine
damage.
7-33
2) HAZARD SWITCH
(1) Use for parking, or roading machine.
OFF
※ If the switch is left ON for a long time, the battery may be
ON
discharged.
77073CD42
77073CD45
77073CD46
7-34
7) REAR WIPER AND WASHER SWITCH
(1) The switch use to operates the rear wiper and washer by two step.
·FFirst step : The rear wiper operates.
·Second step : The washer liquid is sprayed and the rear wiper is
operated only while pressing. If release the
switch, return to the first step position.
77073CD47
77073CD50
7-35
11) RIDE CONTROL SWITCH (Option)
(1) AUTO position
Push in the top of the ride control switch in order to turn on the
automatic ride control. The automatic ride control automatically
turns on when the travel speed exceeds a preset speed of
approximately 9.5km/h. The automatic ride control automatically
77073CD51 shuts off during low speed 8km/h travel mode.
(2) ON position
Push in the bottom of the ride control switch in order to turn on the
system for ride control regardless speed. The ride control will
smooth the ride of the machine during travel.
77073CD51-1
77073CD51-2
73033CD28A
73033CD24
7-36
15) KICK DOWN SWITCH
(1) Manual mode
Kick down switch
It is effective 2nd speed to 1st speed only and recover to 2nd speed
quickly when push the switch one more time.
(2) Automatic mode
① Mode 1(Down/Up)
It shifts down quickly from current gear to one step lower speed by
pushing the switch and recover to original speed quickly when push
the switch one more time.
② Mode 2(Down)
It shifts down from current gear to one step lower speed when push
7807ACD34 the switch every time. Refer to page 7-28.
7707A3CD47
7-37
GROUP 4 ELECTRICAL COMPONENT SPECIFICATION
※ Check disconnection
2 Normal : 0Ω
Fusible link 1 24V 60A (Connect ring terminal and
CN-60 CN-95 check resistance between
terminal 1 and 2)
H BR ACC ST C
H 0 I II 4 23 56 ※ Check contact
OFF : ∞Ω(For each terminal)
0, I 1
ON : 0Ω(For terminal 1-3)
Start key B -
∞Ω(For terminal 1-5)
1 2 3 4 5 6
START : 0Ω(For terminal 1-3
CS-2 and 1-5)
1
Pa
2 ※ Check contact
Pressure switch N.C TYPE Normal : 0Ω(CLOSE)
CD-3 CD-26
CD-39 CD-41
1
※ Check contact
Pressure switch 2 Pa N.O TYPE
Normal : ∞Ω(OPEN)
CD-4 CD-40
CD-5 CD-48
7-38
Part name Symbol Specifications Check
Parking brake/
1 ※ Check resistance
Ride control 2 24V 1A Normal : 15~25Ω
solenoid (For terminal 1-2)
CN-71 CN-137
Pa Pressure :
Air cleaner ※ Check contact
635mmH2O
pressure switch Normal : ∞Ω
CD-10 (N.O TYPE)
Ride control
2 ※ Check LED lamp
valve / Fan 1 24V 1.2A ※ Check Resistance
solenoid About 24Ω
CN-136 CN-154 CN-155
CN-71
1
※ Check resistance
Reed switch :
Fuel sender 2 Full : About 30Ω
Magnetic type
CD-2 Low level : About 300Ω
1 2 1
※ Check resistance
2
Normal : About 200Ω
Relay 3
24V 20A (For terminal 1-3)
(4pin) 4 4 3
AC RY(H1) ACAC
RY(M2) : ∞Ω
CR-2 CR-26 RY1
(For terminal 2-4)
CR-5 CR-30 AC RY2
30
87a 87 85
※ Check resistance
86
87
Normal : About 160Ω
85 (For terminal 2-6)
Relay 30 86
87a 24V 20A : 0Ω
(5pin)
CR-2 CR-3 CR-4 CR-5 CR-7 (For terminal 1-3)
CR-25 CR-26 CR-33 CR-35 CR-36 : ∞Ω
CR-37 CR-38 CR-40 CR-41 CR-46
CR-55 CR-58 CR-59 (For terminal 1-3)
7-39
Part name Symbol Specifications Check
1 B
3 E
Proximate
4 S 24V 400mA
switch
CN-100 CN-101
2 ※ Check resistance
Hydraulic C
Normal : ∞Ω
temperature 1
105。C over : 0Ω
CD-1
※ Check contact
Normal : 1.12Ω
1 Lo 1 (For terminal 2-4)
2 MH 3
Aircon resistor ML 2
: 2.07Ω
3
4 Hi 4 (For terminal 3-4)
: 3.17Ω
(For terminal 4-1)
1
※ Check resistance
Speaker 2 4Ω 20W
Normal : 50Ω
CN-23(LH)
CN-24(RH)
10 9 8 7 6 5 4 3 2 1
※ Check contact
10 6 5
OFF : ∞Ω
Switch
24V 8A (for terminal 1-5, 2-6)
(Locking type) 9 8 2 7 1
CS-17 CS-23 CS-41 : 0Ω
CS-17 CS-23 CS-42 (for terminal 5-7, 6-8)
CS-42
CS-21 CS-59
CS-41 CS-80
CS-54
CS-82
10 9 8 7 6 5 4 3 2 1
7-40
Part name Symbol Specifications Check
1 Work lamp
Work lamp, 24V 70W
2
Room lamp, ※ Check disconnection
CL-1 CL-6 Number plate lamp
Number plate CL-1 CL-6 CL-22
CL-22 Normal : A fewΩ
CL-5
CL-5 CL-21
CL-21CL-23
CL-23 Room lamp
lamp
CL-24 CL-25 CL-30 24V 10W
24V A
24V
DC/DC GND B ※ 24V (A-B)
12V 3A
Converter 12V 12V (B-C)
12V C
※ Check operation
22-28V 2A
Horn Supply power(24V) to each
110dB
CN-20 CN-25 terminal and connect ground
2 PA
1 ※ Check contact
Receiver dryer 24V 2.5A
Normal : ∞Ω
CN-29
1 S.L+
2 ACC
3 N.C
4 S.R+ ※ Check resistance
5 N.C
Cassette radio 6 S.L- 24V 20W+20W Power ON : 4Ω+4Ω
7 B+
8 S.R- (for terminal 1-6, 4-8)
9 N.C
CN-27
7-41
Part name Symbol Specifications Check
24V 0.5A
Back up buzzer -
110dB
CN-65
M 1 ※ Check contact
Washer pump 2 24V 2.5A Normal : 26.4 Ω
(for terminal 1-2)
CN-103 CN-22
1 2 3 4 5 6
24V 1.5A
Hi
Wiper motor E M Lo
2-speed -
Auto parking
CN-102 CN-21
B
A
Cigar lighter 24V 5A -
1
CL-2
B+
G
1 P ~
3
2 L
U ※ Check voltage
Alternator 3 FI 24V 70A
4 NC Normal : 24~28V
CN-74
Delco Remy
Starter ※ Operating or not
B+ M 28MT 24V
CN-45
7-42
Part name Symbol Specifications Check
1
Aircon ※ Check contact
24V 79W
compressor Normal : 13.4Ω
CN-28
※ Check contact
Start relay 24V 200A
Normal : 11.3Ω
CR-23
M 1 24V 9A
Blower -
2 2900±150rpm
※ Check resistance
1 Normal : 0 Ω
1。C OFF
Duct sensor (for terminal 1-2),
2 4。C ON
the atmosphere temp:
over 4。C
※ Check resistance
Door switch 24V 2W
Normal : About 5MΩ
CS-1 CS-55
3 E
G 24V
2 B
Flasher unit 85 ~ 190 C/M -
1 L
50dB
CR-11
7-43
Part name Symbol Specifications Check
1 Lo
Hi 24V 75W/70W
2
(H4 TYPE) ※ Check disconnection
Head lamp 3 E
24V 4W Normal : A few Ω
4 C (T4W)
CL-3 CL-4
4 C
24V 5W
3 T
(R5W)
Combi lamp 2 E -
1 S
2×24V 21W
(P21W)
CL-15 CL-16
1
24V 21W
Turn lamp 2 -
(P21W)
CL-24 CL-25
Continuous
capacity :
Master switch 180Amp -
Push in capacity :
1000Amp
CS-74
2
24V 200mA
Warning buzzer 1 -
90±5dB(ℓm)
CN-26
7-44
GROUP 5 CONNECTORS
1. CONNECTOR DESTINATION
Connector No. of Connector part No.
number Type pin Destination
Female Male
CN-1 58 2 I/conn(Frame harness-Main harness) S813-030200 S813-130200
CN-2 Econoseal J 12 I/conn(Main harness-Frame harness) S816-012002 S816-112002
CN-3 AMP 15 I/conn(Frame harness-Main harness) 2-85262-1 368301-1
CN-4 AMP 15 I/conn(Main harness-Frame harness) 2-85262-1 368301-1
CN-5 AMP 15 I/conn(Frame harness-Main harness) 2-85262-1 368301-1
CN-6 AMP 15 I/conn(Main harness-Frame harness) 2-85262-1 368301-1
CN-7 AMP 15 I/conn(Main harness-Cab harness) 2-85262-1 368301-1
CN-8 Econoseal J 8 I/conn(Main harness-Cab harness) S816-008002 S816-108002
CN-9 Econoseal J 12 I/conn(Main harness-Front harness) S816-012002 S816-112002
CN-10 AMP 15 I/conn(Main harness-Front harness) 2-85262-1 368301-1
CN-11 DEUTSCH 8 I/conn(Main harness-Aircon harness) DT06-8S -
CN-12 AMP 15 I/conn(Frame harness-Engine harness) 2-85262-1 368301-1
CN-13 Econoseal J 15 I/conn(Frame harness-Engine harness) S816-012002 S816-112002
CN-18 Econoseal J 4 I/conn(Ride control harness-Front harness) S816-004002 S816-104002
CN-20 Molex 2 Horn 36825-0211 -
CN-21 HW090 6 Front wiper motor 6189-0133 -
sealed
CN-22 SWP 2 Front washer tank S814-002000 -
CN-23 KET 2 Speaker(LH) 7123-1520 -
CN-24 KET 2 Speaker(RH) 7123-1520 -
CN-25 Molex 2 Horn 36825-0211 -
CN-26 250 2 Warning buzzer S810-002202 -
CN-27 PA 9 Cassette and radio S811-009003 -
CN-28 MWP 1 Comp(Air-con) NMWP01F-B -
CN-29 KET 2 Receiver drier MG640795 -
CN-45 Ring term - Starter S820-414000 -
CN-56 AMP 20 Cluster 174047-2 -
CN-58 Econoseal III 36 Controller 344111-1 -
CN-59 AMP 23 Controller 770680-1 -
CN-65 DEUTSCH 2 Back up buzzer DT06-2S-EP06 -
CN-71 DEUTSCH 2 Parking solenoid DT06-2S-EP06 -
CN-74 PACKARD 4 Alternator 1218-6568 -
CN-83 NMWP 2 Aircon fan PB625-02027 -
CN-93 DEUTSCH 50 ECM DRC26-50S-04 -
CN-94 DEUTSCH 4 ECM power DTP06-4S-EP06 -
7-45
Connector No. of Connector part No.
Type Destination
number pin Female Male
CN-96 PACKARD 4 Fuel heater 2-967325-3 -
CN-99 DEUTSCH 2 Resister DT04-3P-EP10 -
CN-100 Autonics - Boom kick out 21L6-20020 -
CN-101 Autonics - Bucket leveler 21L6-20020 -
CN-102 HW090 6 Rear wiper motor 6189-01330 -
sealed
CN-103 SWP 2 Rear washer tank S814-002000 -
CN-112 - 16 Gear box 21L7-60290 -
CN-114 Econoseal J 12 Joy stick - S816-112002
CN-136 DEUTSCH 2 Ride control solenoid DT06-2S-EP06 -
CN-137 DEUTSCH 2 Control valve solenoid DT06-2S-EP06 -
CN-138 DEUTSCH 3 DC/DC Converter DT06-3S-EP06 -
CN-139 DEUTSCH 2 12V socket - DT04-2P
CN-154 AMP 2 Fan clutch 85202-1 -
CN-157 AMP 68 T/M control unit 962175 -
CN-158 PACKARD 4 Gear shift lever - 1201-0974
CN-159 PACKARD 4 Gear shift lever 1201-5797 -
CN-162 Econoseal J 6 Pedal S816-006002 -
Relay
CR-1 Ring term - Battery relay S820-104000 -
CR-2 250 4 Horn relay S810-004202 -
CR-3 250 4 Front work lamp relay S810-004202 -
CR-4 250 6 Wiper relay(Hi) S810-006202 -
CR-5 250 2 Safety relay S810-006202 -
CR-7 250 4 Aircon relay S810-004202 -
CR-11 250 3 Flasher unit S810-003702 -
CR-23 SWP 2 Start relay - S814-102001
CR-24 Shur 1 Preheater relay S822-014000 -
CR-36 250 4 Preheater relay S810-004202 -
CR-46 250 4 Fuel warmer relay S810-004202 -
CR-55 250 4 Rear work lamp relay S810-004202 -
CR-58 250 1 Back up relay S810-004202 -
Switch
CS-1 Shur 1 Door switch S822-014004 -
CS-2 SWP 6 Start key switch S814-006000 -
CS-5 Shur 1 Horn switch S822-014000 -
CS-11 SWP 8 Multi function switch S814-008000 -
CS-12 SWP 6 Multi function switch S814-006000 -
7-46
Connector No. of Connector part No.
Type Destination
number pin Female Male
CS-17 SWF 10 Parking switch 593757 -
CS-21 SWF 10 Main light switch 593757 -
CS-23 SWF 10 Beacon switch 593757 -
CS-35 SWF 10 Rear wiper 593757 -
CS-36 SWF 10 Work lamp switch 593757 -
CS-41 SWF 10 Hazard switch 593757 -
CS-42 SWF 10 Clutch cut off switch 593757 -
CS-55 SWF 10 Ride control switch 593757 -
CS-59 SWF 10 Auto/manual switch 593757 -
CS-74 Ring term 1 Master switch S820-210002 -
CS-75 SWF 10 Steering pump switch 593757 -
CS-76 SWF 10 Mirror heater 593757 -
CS-82 SWF 10 Seat heater 593757 -
Light
CL-2 250 3 Cigar lighter S810-003202 -
CL-3 DEUTSCH 4 Head light DT04-4P-E005 -
CL-4 DEUTSCH 4 Head light DT04-4P-E005 -
CL-5 DEUTSCH 2 Work light(LH) - DT04-2P-E005
CL-6 DEUTSCH 2 Work light(RH) - DT04-2P-E005
CL-7 AMP 2 Beacon lamp S822-014004 S822-114004
CL-15 SWP 4 Combi lamp(RR, LH) S814-004000 -
CL-16 SWP 4 Combi lamp(RR, RH) S814-004000 -
CL-21 SWP 2 Numberplate lamp S814-002000 -
CL-22 DEUTSCH 2 Work light(LH) - DT04-2P-E005
CL-23 DEUTSCH 2 Work light(RH) - DT04-2P-E005
CL-24 SWP 2 Turn lamp(LH) S814-002000 -
CL-25 SWP 2 Turn lamp(RH) S814-002000 -
CL-30 KET 2 Room lamp MG610392 -
CL-32 DEUTSCH 2 Rear work light(RH) - DT04-2P-E005
CL-33 DEUTSCH 2 Rear work light(LH) - DT04-2P-E005
Sensor, sender
CD-1 AMP 2 Hyduaulic oil temo sendor 85202-1 -
CD-2 SWP 2 Fuel sendor S814-002000 -
CD-3 Rubber cap - Brake fail pressure switch 21EA-003100 -
CD-4 Rubber cap - Stop lamp pressure switch 21EA-003100 -
CD-5 Rubber cap - Clutch cut off pressure switch 21EA-003100 -
CD-10 Ring term 2 Air cleaner switch S820-105000 -
7-47
Connector No. of Connector part No.
Type Destination
number pin Female Male
CD-17 AMP 2 Engine pick-up sensor 85202-1 -
CD-26 Rubber cap - Parking pressure switch 21EA-003100 -
CD-27 AMP 2 Turbin pick up sensor 85202-5 -
CD-35 PACKARD 2 Fuel filter 1204-0753 -
CD-39 Rubber cap 2 Main pump pressure switch 21EA-00310 -
CD-40 Rubber cap 2 Steering pump pressure switch 21EA-00310 -
CD-41 Rubber cap 2 Boom down pressure switch 21EA-00310 -
CD-46 AMP 3 Output speed sensor 282087 -
CD-47 AMP 2 Gear chain senser 85202-1 -
CD-48 AMP 2 Oil filter 282080 -
CD-49 AMP 2 Converter sensor 85202-1 -
7-48
2. CONNECTION TABLE FOR CONNECTORS
1) 58-L TYPE CONNECTOR
No. of
Receptacle connector(Female) Plug connector(Male)
pin
1 1
S813-030100 S813-130100
1 2 1 2
S813-030200 S813-130200
7-49
2) PA TYPE CONNECTOR
No. of
Receptacle connector(Female) Plug connector(Male)
pin
2 5 1 3
1 3 2 5
S811-005002 S811-105002
3 7 1 4
1 4 3 7
S811-007002 S811-107002
4 9
1 5
1 5
4 9
S811-009002 S811-109002
5 11 1 6
11
1 6 5 11
S811-011002 S811-111002
7-50
No. of
Receptacle connector(Female) Plug connector(Male)
pin
6 13 1 7
13
1 7 6 13
S811-013002 S811-113002
1 9
8 17
17
1 9 8 17
S811-017002 S811-117002
110 21 1 11
21
1 11 10
1 21
S811-021002 S811-121002
7-51
3) J TYPE CONNECTOR
No. of
Receptacle connector(Female) Plug connector(Male)
pin
1 2
1
2 12
S816-002001 S816-102001
2 3 1
3 1 2
S816-003001 S816-103001
3 1 4 2
4 2 3 1
S816-004001 S816-104001
8 5 2
6 3 1
8 5 2 6 3 1
S816-008001 S816-108001
7-52
4) SWP TYPE CONNECTOR
No. of
Receptacle connector(Female) Plug connector(Male)
pin
1 1
S814-001000 S814-101000
2 1
1 2
S814-002000 S814-102000
3 1
2 1 23
S814-003000 S814-103000
2 4 1 3
1 3 2 4
S814-004000 S814-104000
7-53
No. of
Receptacle connector(Female) Plug connector(Male)
pin
3 6 1 4
3 6
1 4
S814-006000 S814-106000
4 8 1 5
4 8
1 5
S814-008000 S814-108000
4 12 1 9
12
4 12
1 9
S814-012000 S814-112000
3 14 11
1
14
1 11 3 14
S814-014000 S814-114000
7-54
5) CN TYPE CONNECTOR
No. of
Receptacle connector(Female) Plug connector(Male)
pin
1 1
S810-001202 S810-101202
2 2
1 1
S810-002202 S810-102202
3 2
1 2 1 3
S810-003202 S810-103202
2 4 1 3
1 3 2 44
S810-004202 S810-104202
7-55
No. of
Receptacle connector(Female) Plug connector(Male)
pin
3 6 1 4
1 4 3 6
S810-006202 S810-106202
4 8 1 5
1 5 8
4
S810-008202 S810-108202
7-56
6) ITT SWF CONNECTOR
No. of
pin Receptacle connector(Female) Plug connector(Male)
2
10
1 10
9
SWF593757
6 3
4
6
6189-0133
8) MWP02F-B CONNECTOR
No. of
pin Receptacle connector(Female) Plug connector(Male)
2 1
2
PH805-02028
7-57
9) AMP ECONOSEAL CONNECTOR
No. of
pin Receptacle connector(Female) Plug connector(Male)
12
1
12
13 24
36
25
24 36 1
13
36
25
344111-1
344111-1 344108-1
344108-1
85202-1
12 1 6
7 12
174045-2
7-58
12) KET 090 WP CONNECTORS
No. of
Receptacle connector(Female) Plug connector(Male)
pin
2 1
MG640795
2
10
1 10
9
SWF593757
1
1
NMWP01F-B
7-59
15) DEUTSCH DT CONNECTORS
DT 06 - 3S - ★★★★
Modifications(See below)
Number of contacts(P : Pin, S : Socket)
04 : Receptacle, 06 : Plug
Deutsch connetors
※ Modification
E003 : Standard end cap - gray
E004 : Color of connector to be black
E005 : Combination - E004 & E003
EP04 : End cap
EP06 : Combination P012 & EP04
P012 : Front seal enhancement - connectors color to black for 2, 3, 4 & 6pin
No. of
Receptacle connector(Female) Plug connector(Male)
pin
1 2 2 1
2
DT06-2S DT04-2P
2 1 1 2
3 3
DT06-3S DT04-3P
4 1 1 4
3 2 2 3
DT06-4S DT04-4P
7-60
No. of
Receptacle connector(Female) Plug connector(Male)
pin
6 1 1 6
4 3 3 4
DT06-6S DT04-6P
4 5 5 4
1 8 1
8
DT06-8S DT04-8P
6 7 7 6
12
1 12 12 1
DT06-12S DT04-12P
7-61
16) ECONOSEAL J TYPE CONNECTORS
No. of
Receptacle connector(Female) Plug connector(Male)
pin
S816-001002 S816-101002
S816-002002 S816-102002
S816-003002 S816-103002
S816-004002 S816-104002
7-62
No. of
Receptacle connector(Female) Plug connector(Male)
pin
S816-006002 S816-106002
S816-008002 S816-108002
10
S816-010002 S816-110002
12
S816-012002 S816-112002
7-63
No. of
Receptacle connector(Female) Plug connector(Male)
pin
15
368301-1 2-85262-1
12040753
7-64
GROUP 6 TROUBLESHOOTING
1. WHEN STARTING SWITCH IS TURNED ON, CLUSTER LAMP DOES NOT LIGHT UP
·Before carrying out below procedure, check all the related connectors are properly inserted and the
fuse No.25 is not blown out and ON/OFF of bulb.
·After checking, connect the disconnected connectors again immediately unless otherwise specified.
Cause Remedy
YES
Defective cluster Replace
Check voltage
YES
between CN-56
(1, 2) and chassis
NO
Disconnection in Repair or replace
wiring harness or (After clean)
poor contact
between CN-15(1)
and fuse No.25
CLUSTER
1
FUSE
2 1
No.25
CN-56
CN-15
Check voltage
YES 20 ~ 30V
NO 0V
7807AEL15
7-65
2. WHEN BATTERY LAMP LIGHTS UP(Engine is started)
·Before carrying out below procedure, check all the related connectors are properly inserted.
·After checking, connect the disconnected connectors again immediately unless otherwise specified.
Cause Remedy
YES
Defective controller Replace
Check voltage
YES
between CN-58
(25) and chassis
NO Disconnection in Repair or replace
Voltage : 27.5~30V wiring harness or (After clean)
poor contact
Check voltage between CN-58
YES between CN-3(5)
(25) and CN-3(5)
and chassis
YES
Voltage : 26~30V Disconnection in Repair or replace
wiring harness or (After clean)
Check voltage poor contact
between CN- between CN-13(8)
NO
Check voltage 13(8) and chassis and CN-3(5)
between
alternator terminal Disconnection in Repair or replace
"2" and chassis NO
wiring harness or (After clean)
Voltage : 26~30V poor contact
Starting switch : ON
between CN-13(8)
and alternator
terminal " 2 "
CONTROLLER(MCU)
ALTERNATOR
25 5 8 " 2 " TERMINAL
CN-3 CN-13
CN-58
Check valtage
YES 20 ~ 30V
NO 0V 7707AEL16
7-66
3. WHEN PARKING SOLENOID DOES NOT WORK
·Before carrying out below procedure, check all the related connectors are properly inserted and the
fuse No.8 is not blown out.
·After checking, connect the disconnected connectors again immediately unless otherwise specified.
Cause Remedy
YES
Defective parking Replace
Check voltage brake solenoid
between CN-71
(2) and chassis YES
Defective parking Replace
Check voltage
Starting switch : ON switch
Parking switch : ON-OFF NO
between CS-17
Voltage : 20~30V (6) and chassis
NO
Disconnection in Repair or replace
Voltage : 20~30V
wiring harness or (After clean)
poor contact
between CS-17
(6) and Fuse
No.8
PARKING SWITCH
8 2
1
5
CN-71
6
CS-17 FUSE
No.8
7707EL24
7-67
4. TRANSMISSION IS NOT RETURNED TO NEUTRAL WHEN PARKING BRAKE IS APPLIED
·Before carrying out below procedure, check all the related connectors are properly inserted and the
fuse No.17(T/M control unit) and No.8 are not blown out.
·After checking, connect the disconnected connectors again immediately unless otherwise specified.
Cause Remedy
YES
Defective T/M Replace
control unit
PARKING SWITCH
FUSE
6
5 No.8
7 T/M CONTROL UNIT
CS-17 21
CN-157
Check resistance
YES MAX 1Ω
7807AEL17
NO MIN 1MΩ
7-68
5. MACHINE DOES NOT TRAVEL
·Before carrying out below procedure, check all the related connectors are properly inserted and the
fuse No.17(Transmission controller) is not blown out.
·After checking, connect the disconnected connectors again immediately unless otherwise specified.
·Wiring diagram : See page 7-17.
Cause Remedy
YES
Defective clutch Replace
cut-off switch
Check resistance
YES
between CD-5
and chassis
NO
Defective T/M Replace
Is voltage between
control unit
CN-157(21) and
chassis 20-28V? YES
Defective Replace
Starting switch : ON
Parking switch : OFF
parking switch
Clutch cut-off
Is there continuity
switch : ON between CS-17(7)
YES
and chassis?
Check resistance
YES MAX 1Ω
NO MIN 1MΩ
7-69
6. WHEN STARTING SWITCH IS TURNED ON, WIPER MOTOR DOES NOT OPERATE
·Before carrying out below procedure, check all the related connectors are properly inserted and the
fuse No.9 is not blown out.
·After checking, connect the disconnected connectors again immediately unless otherwise specified.
MCU
FAN CLUTCH +
CLUTCH CUT-OFF PS
SPEEDMETER SIG.
COOLANT TEMP
BUZZER STOP
WIPER RY
STEERING RY
ALT LEVEL
FUEL SENSOR
TACHO SENSOR+
PREHEATER
SERIAL-H
WASH SIG
NEUTRAL SIG
FAN CLUTCH -
CAN-H
AUTO SEL.TCU
ELEC STEERING
CAN-L
MAIN PUMP PS
CLUTCH CUT-OFF SW
STEERING P/P PS
RIDE CONT. ON
WIPER INT SIG
PARKING SIG
SERIAL-L
GND
BUZZER
AUTO SEL.SW
BRAKE PS
TAHCO SENSOR -
AIR FILTER
IG 24V
FUSE BOX
BEACON/RR WORK LAMP 20A
1
ILL.LAMP 20A
Cause Remedy 2
HEAD LAMP 20A
YES 3
BACK/STOP LAMP 10A
Check voltage Defective front Replace
23
35
34
24
36
31
26
32
25
33
27
21
20
30
29
28
22
17
19
11
18
16
12
10
13
15
14
1
4
2
3
6
8
4
5
7
9
HORN/CONVERTER 30A
YES between front wiper motor 5
105 GOr
120 LW
CN-58
69A G
AIR-CON/HEATER 30A
6
wiper motor and CIGAR/MIRROR 30A
7
chassis Poor connection of Replace SWITCH 30A
8
Check voltage Voltage : 20~30V
NO 14 L WIPER 20A
YES chassis 9
between CN-21(5) Starting switch : ON FR WORK LAMP 30A
10
Wiper switch : 1st
and chassis CN-36
120 LW
163 Br
162 G
14F L
69 Gr
Wiper switch : 1st
YES
CN-16
Disconnection in Repair or replace
10
11
12
13
14
6
7
9
8
wiring harness or (After clean)
Check voltage poor contact
between CN-16(8) between CN-16(8)
NO
G61 B
172 G
173 R
and chassis. and fuse No.9
8 W
VOr 38
LW 17
Gr 18
Br 19
G 20
L 21
CN-17
10
11
12
13
14
1
2
3
4
5
6
7
8
9
Discomection in Repair or replace
CS-11
CS-12
CS-5
NO
6
5
4
3
2
1
8
7
6
5
4
3
2
1
wiring harness or (After clean) 38 VOr
poor contact
BWG 4
RW 6
W6
BVi 3
L 4
G 5
BY 1
Gr 2
VOr
W
Y
B
G
R
between CS-12(6)
G1
28
38
27
26
HO
and CN-16(8).
W
II
I
Hi
C
J 0
J
C
CN-21
1
2
3
5
4
6
0
II
I
Lo
Hi
5 Lo
4 Hi
3E
B+
2Pf
1B
F
R
L
O
R
L
M
7 Y Lo
8 WB
2 BW
3 BG
5B
FRONT WIPER
MULTI FUNCTION SWITCH
7707AEL18
7-70
7. WHEN STARTING SWITCH "ON" DOES NOT OPERATE
·Before carrying out below procedure, check all the related connectors are properly inserted and and
the fuse No.16 is not blown out.
·After checking, connect the disconnected connectors again immediately unless otherwise specified.
FUSE BOX
Cause Remedy EMER STEER/RIDE CON 20A
10
11
YES NEUTRAL RY/JOYSTICK F/R 10A
Defective cable Repair or replace 12
PREHEATER 30A
Check voltage 13
YES assembly (After clean) TURN LAMP
14
between CN-60(2) CASSETTE/ROOM LAMP 5A 3R 34
15
and chassis 21 3Or START KEY 30A
16
TCU
Short circuit or Replace 10A
17
Voltage : 20~30V NO ECM 10A
18
Check voltage defect of fusible CLUSTER/MCU 10A
YES 19
between CR-1 link or defective AC & HEATER 20A
20
ECM 10A
and chassis 21
battery relay RCV 10A
22
Voltage : 20~30V MCU 10A
23
TCU 10A
24
Disconnection in Repair or replace CLUSTER 10A
25
NO CASSETTE 10A
Check voltage wiring harness or (After clean) 26
ILLUMINATION LAMP 5A
YES between CS-2 ILLUMINATION LAMP 5A
27
21E Or
153 L
10 DO-1
11
12
CN-3
CS-2
5
4
1
6
2
3
B
0, I
1
H 0 I II
4
6
5
3
2
H
C ST ACC BR
START SWITCH
7607AEL19
7-71
8. WHEN STARTING SWITCH IS TURNED ON, WORK LAMP DOES NOT LIGHTS UP
·Before carrying out below procedure, check all the related connectors are properly inserted, and the
fuse No.1, 10 is not blown out.
·After checking, connect the disconnected connectors again immediately unless otherwise specified. FUSE BOX
5 G BEACON/RR WORK LAMP 20A
1
10 OrW ILL.LAMP 20A
2
HEAD LAMP 20A
3
BACK/STOP LAMP 10A
4
HORN/CONVERTER 30A
Cause Remedy AIR-CON/HEATER 30A
5
6
YES CIGAR LIGHTER/MIRROR 30A
8
YES
between each WIPER 20A
9
15 Gr FR WORK LAMP 30A
lamp and chassis 10
Disconnection in Repair or replace EMER STEER/RIDE CON 20A
11
NO
Voltage : 20~30V wiring harness or (After clean) CN-36
Check voltage Starting switch : ON poor contact OPT
YES between CN-7(2), between CL-6(2), RW 2F
FRONT WORK LAMP
2
CN-4(14) and CL-5(2), CL-22(2),
B G24
1
chassis CL-23(2) and CN-
CL-36
FRONT WORK LAMP
Voltage : 20~30V RW 2E
7(2), CN-4(14). B G23
2
Starting switch : ON 1
CL-35
Check voltage
Disconnection in Repair or replace FR WORK LAMP RY 1 FRONT WORK
YES between CR- NO 2
RW 2
LAMP,LH
wiring harness or (After clean) 86 30 87a
B G16 RW 2A
3(87), CR-55(87) 85 3 2
poor contact 87
RW 171 4 B G22
1
and chassis G 170 5
between CN-7(2) - 85 87 87a
86
Gr 15 6
CL-6
Voltage : 20~30V 30 7 FRONT WORK
Starting switch : ON
CR-3(87) and CN- CR-3 8
B G21
LAMP,RH
RW 2
4(14) - CR-55(87) 9
B G21
2
Check voltage 10
11
1
CL-5
between CR- Defective work Replace relay 12 OPT
REAR WORK LAMP
3(30), CR-55(30) NO 13 R 10 R 10
lamp relay 14
B G25
2
and chassis 15 1
CN-7 CL-32
Voltage : 20~30V YES RR WORK LAMP RY
Disconnection in Repair or replace R 10A
REAR WORK LAMP
Starting switch : ON 86 30 87a
B G17 1 2
wiring harness or (After clean) 85 2
B G26
1
R 63
Check voltage poor contact 87
L 180 3 CL-33
86 4
between fuse No. between CR- 85 87 87a
30
Gr 5
5 REAR WORK
LAMP,LH
NO 3(30), CR-55(30) CR-55 6 40A R
2
1, 10 and chassis 7 G3 B
and fuse No.1, 10 8 1
WORK LAMP SW 9 CL-22
Voltage : 20~30V B G36 10
9 10 10
Starting switch : ON Short circuit of fuse Replace 9 R 1G 11
NO 4 8 12 REAR WORK
LAMP,RH
2 G 170 13
7 R 40 40 R
14 2
7 1 6 G2 B
15 1
5 5
R 1F CN-4 CL-23
4
G1
3
L 180
II I 0
2
1 R 1E
CS-36 EARTH 1
CS-21
9 10 10
9
4 8
2 R 1
7
7 1 6
5 5
4
3
II I 0
2
OrW 10
1
ILL & HEAD LAMP SW : ON(1st step)
7807AEL20
7-72
9. WHEN ENGINE DOES NOT START
·Check supply of the power at engine stop solenoid while starting switch is ON.
·Before carrying out below procedure, check all the related connectors are properly inserted.
·After checking, connect the disconnected connectors again immediately unless other wise specified.
T/M CONTROL UNIT MCU
·Check forward reverse switch at neutral position.
SAFETY RY
ADM5-JOYSTICK SELLECTER(+)
WIPER RY
STEERING RY
PREHEATER
NEUTRAL SIG
ADM1-START INTERLOCK RY(-)
ED9-CLUTCH CUT-OFF SW(+)
VPE2-CONTINUANCE 24V
ED14-NEU-JOYSTICK
ED13-REV-JOYSTICK
FUSE BOX
ED8-FWD-JOYSTICK
10
Cause Remedy EMER STEER/RIDE CON 20A
11
17 G NEUTRAL RY/JOYSTICK F/R 10A
YES 12
Defective batteryCheck engine PREHEATER 30A
35
34
36
32
33
SAFETY RY 13
TURN LAMP
system charge or G 17
30
65
66
67
68
44
31
30
52
59
CN-58 14
5
7
73 BOr
85
86 87a 87
G 17A CASSETTE/ROOM LAMP 5A
replace (after CN-157
85 W
15
BOr 73 21 3Or START KEY 30A
87 16
checking specific BOr 88
85 TCU 10A
17
gravity of battery) 87a 30 86 ECM 10A
18
YES CLUSTER/MCU 10A
Check voltage Defective magnet Replace CR-5 19
Check operation SAFETY RY AC & HEATER 20A
YES between starter of start motor GrW 157 ECM
20
30 10A
of start motor magnet coil and 85 21
BOr 73A
86 87a 87 RCV 10A
22
BW 151
chassis Defective start Replace X-1 87 MCU 10A
23
Starting switch : start NO VM OUTPUT SIGNAL K A 85 TCU 10A
Starting switch : start relay 24
VP F B N D B 87a 30 86 CLUSTER 10A
ED 1 2 3 4 1 2 3 4 1 2 3 4 C 25
CR-5 CASSETTE 10A
YES AD1 B1 D 26
ⓐ AD2 B2 CN-158 ILLUMINATION LAMP 5A
27
Check operation Check voltage
AD3
AD4
B3
V X-2
ILLUMINATION LAMP 5A
28
NO of starter relay YES AD5 R A 1
between CR-5 AD6 AS B 2 CN-36
AD7 C 3
(87) and chassis A AD3 D
W 33
4
Starting switch : start
NO
Disconnection in Replace B AD2 CN-159 5
Starting switch : OFF 6
wiring harness or C AD1
D AD7(KD) 7
X1
Check operation poor contact 8
A ED1(VP) 9
of start safety between CN-3(4) D AD6 10
NO B AD4 11
relay and CR-5(87) C AD5 12 STARTER
X2 TO BATT
13 B+
Check switch : neutral YES 14
Defective relay Replace CN-17
Check voltage M
between CR-5 CN-45
NO 1
(86) and chassis 2 5
START RY
G1 B
Starting switch : OFF NO
ⓑ 3
BW 18
6 1
4 7 2
17 BW
YES 5 8
CR-23
Defective start Replace 6 9
Check voltage relay 7 10
8 11
ⓐ between CR-23
21E Or
157 GrW
65 G
9 12
(2) and chassis 10 CN-13
Disconnection in Repair or replace 11
Voltage : 20~30V NO 12
Starting switch : ON wiring harness or
21 3Or
G14 B
31 3Br
65A G
G15 B
32 3Y
65 G
21A Or
CN-3
CS-2
poor contact
5
4
1
6
2
3
between CN-3(4) -
CR-35
CR-25
87a 85 87 86 30 87a 85 87 86 30 B
0, I
1
CN-13(7)-CR-23(2) 87a 87a
30 87 30 87
YES 86 85 86 85
H 0 I II
Disconnection in Repair or replace
4
6
5
3
2
H
C ST ACC BR
wiring harness or POWER RY ECM POWER RY START SWITCH
Check voltage poor contact
ⓑ between CN-17 between CN-17(4)
(4) and chassis and CN-157
Starting switch : OFF
NO
Defective DW-3 Replace 7707AEL21
7-73