988 G

MAINTENANCE INTERVALS
Operation and Maintenance

Manual Excerpt
2010 Caterpillar
All Rights Reserved
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SEBU7198-07
June 2005
Operation and
Maintenance
Manual
988G Wheel Loader
BNH1-Up (Machine)
2TW1-Up (Machine)
86
Maintenance Section
Maintenance Interval Schedule
SEBU7198-07
i02354211

SMCS Code: 7000
Note: All safety information, warnings, and
instructions must be read and understood before
you perform any operation or any maintenance
procedure.
Tire Inflation - Check ........................................... 141
Every 100 Service Hours or 2 Weeks

Axle Oscillation Bearings - Lubricate .................... 90
Steering Cylinder Bearings - Lubricate ............... 140
Initial 250 Service Hours

Transmission Oil Filter - Replace ........................ 143
Before each consecutive interval is performed, all

of the maintenance requirements from the previous
interval must also be performed.
Every 250 Service Hours
When Required
Every 250 Service Hours or Monthly
Automatic Lubrication Grease Tank - Fill .............. 88

Battery - Recycle .................................................. 91
Battery or Battery Cable - Inspect/Replace .......... 92
Bucket Lift and Bucket Tilt Control Inspect/Clean ...................................................... 95
Circuit Breakers - Reset ........................................ 98
Engine Air Filter Primary Element Clean/Replace .................................................. 107
Engine Air Filter Secondary Element - Replace .. 109
Engine Air Precleaner - Clean ............................. 111
Ether Starting Aid Cylinder - Replace ................. 121
Fuel System - Prime ........................................... 121
Fuses - Replace .................................................. 126
Lift Cylinder Pin Oil Level - Check ...................... 133
Loader Boom Pin Oil Level - Check .................... 135
Oil Filter - Inspect ................................................ 137
Radiator Core - Clean ......................................... 138
Seat Side Rails - Adjust ...................................... 140
Window Washer Reservoir - Fill .......................... 147
Window Wiper - Inspect/Replace ........................ 147
Battery - Clean ...................................................... 91

Belts - Inspect/Adjust/Replace .............................. 92
Brake Accumulator - Check .................................. 93
Braking System - Test ........................................... 93
Differential and Final Drive Oil Level - Check ..... 105
Engine Air Filter Service Indicator Inspect/Replace ................................................. 111
Engine Oil (High Speed) and Oil Filter - Change .. 113
Engine Oil and Filter - Change ............................ 116
Every 10 Service Hours or Daily
Differential and Final Drive Oil Sample - Obtain .. 106

Hydraulic System Oil Sample - Obtain ............... 131
Transmission Oil Sample - Obtain ...................... 145
Backup Alarm - Test .............................................. 90

Bucket Cutting Edges - Inspect/Replace .............. 94
Bucket Stops - Inspect/Replace ............................ 95
Bucket Tips - Inspect/Replace .............................. 95
Bucket Wear Plates - Inspect/Replace ................. 97
Cooling System Coolant Level - Check .............. 102
Engine Air Filter Service Indicator - Inspect ......... 110
Engine Oil Level - Check ..................................... 115
Hydraulic System Oil Level - Check ................... 130
Loader Boom Pin and Lift Cylinder Pin - Inspect .. 136
Loader Pins and Bearings - Lubricate ................ 136
Seat Belt - Inspect .............................................. 139
Transmission Oil Level - Check .......................... 145
Walk-Around Inspection ...................................... 146
Windows - Clean ................................................. 147
Engine Oil Sample - Obtain ................................. 116
Initial 500 Service Hours

Seat Side Rails - Adjust ...................................... 140
Initial 500 Hours (for New Systems, Refilled

Systems, and Converted Systems)
Cooling System Coolant Sample (Level 2) Obtain ............................................................... 102
Every 500 Service Hours
Every 500 Service Hours or 3 Months

Axle Oil Cooler Filter - Replace ............................ 89
Cooling System Coolant Sample (Level 1) Obtain ............................................................... 101
Engine Oil (High Speed) and Oil Filter - Change .. 113
Engine Oil and Filter - Change ............................ 116
Fuel System Primary Filter (Water Separator)
Element - Replace ............................................ 123
Fuel System Secondary Filter - Replace ............ 124
Fuel Tank Cap and Strainer - Clean ................... 125
Hydraulic System Oil Filter - Replace ................. 129
Transmission Oil Filter - Replace ........................ 143
Every 50 Service Hours or Weekly
Every 1000 Service Hours or 6 Months
Cab Air Filter - Clean/Replace .............................. 97

Fuel System Primary Filter (Water Separator) Check/Drain ...................................................... 122
Fuel Tank Water and Sediment - Drain ............... 125
Articulation Bearings - Lubricate ........................... 88

Battery Hold-Down - Tighten ................................. 92
Case Drain Oil Filters - Replace ........................... 98
Drive Shaft Support Bearing - Lubricate ............. 107
SEBU7198-07
Rollover Protective Structure (ROPS) - Inspect .. 139

Transmission Oil - Change ................................. 141
Every 2000 Service Hours or 1 Year

Differential and Final Drive Oil - Change ............ 104
Engine Crankcase Breather - Clean .................... 112
Engine Valve Lash - Check ................................. 120
Engine Valve Rotators - Inspect ......................... 120
Hydraulic System Oil - Change ........................... 127
Hydraulic Tank Breaker Relief Valve - Clean ...... 131
Lift Cylinder Pin Oil Level - Check ...................... 133
Loader Boom Pin Oil - Change ........................... 134
Refrigerant Dryer - Replace ................................ 138
Every 3000 Service Hours or 2 Years

Crankshaft Vibration Damper - Inspect ............... 104
Engine Mounts - Inspect ...................................... 112
Every 3 Years After Date of Installation or

Every 5 Years After Date of Manufacture
Seat Belt - Replace ............................................. 139

Hydraulic System Oil - Change ........................... 127
Every 4000 Service Hours or 2.5 Years

Electronic Unit Injector - Inspect/Adjust .............. 107

Alternator - Inspect ............................................... 88
Lift Cylinder Pin Oil - Change ............................. 132
Starting Motor - Inspect ...................................... 140
Turbocharger - Inspect ........................................ 146

Cooling System Coolant Extender (ELC) - Add .. 100

Cooling System Water Temperature Regulator Replace ............................................................. 103
Engine Water Pump - Inspect ............................. 120
Every 12 000 Service Hours or 6 Years

Cooling System Coolant (ELC) - Change ............. 99
87
Maintenance Section
88
Maintenance Section
Alternator - Inspect
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i02154861
Alternator - Inspect
SMCS Code: 1405-040
Illustration 133
g01092660
Apply grease through one fitting on the upper pivot

bearing.
Illustration 132
g01092657
The alternator is located on the right side of the

machine.
Caterpillar recommends a scheduled inspection
of the alternator. Inspect the alternator for loose
connections and for proper battery charging.
Keep the batteries fully charged.
Air temperature affects the cranking power of the
batteries. Keep the batteries warm. The engine will
not crank if the batteries are too cold. A warm engine
will not crank if the batteries are too cold.
When the engine is operated for short periods of
time, the batteries may not fully recharge. Make
sure that the alternator is properly functioning. The
alternator will charge the batteries.
Illustration 134
g01092661
Apply grease through one fitting on the lower pivot

bearing.
i02216552
Reference: For additional information, refer to the

appropriate Service Manual for this machine.
i02147795
Articulation Bearings Lubricate

SMCS Code: 7057-086-BD; 7065-086-BD;
7066-086-BD
Wipe off the fittings before any lubricant is applied.
Automatic Lubrication Grease

Tank - Fill
(If Equipped)
SMCS Code: 7540-544-TNK
A pressure hazard is present. Severe personal injury or death can result from removing hoses or
fittings that are under pressure. Relieve the pressure in the system before you remove hoses or
fittings.
SEBU7198-07
The Centro-Matic Lubrication

System
Reference: Before any service work is performed on
the lubrication system, refer to Special Instructions,
REHS1394 or consult your Caterpillar dealer.
Bulk Fill
1. In order to fill the reservoir, remove the lower and
upper plugs from the side of the reservoir.
2. Attach the appropriate pump to the lower inlet.
3. Fill the reservoir until visual indicator on the lid
of the tank indicates FULL or until the grease
appears at the top vent port.
Reference: For the correct type of grease, refer
to Operation and Maintenance Manual, Lubricant
Viscosities.
89
Maintenance Section
Axle Oil Cooler Filter - Replace
i02335496
Axle Oil Cooler Filter - Replace

SMCS Code: 3004-510-AOC
NOTICE
Care must be taken to ensure that fluids are contained
during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to
collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.
Refer to Special Publication, NENG2500, Caterpillar
Tools and Shop Products Guide for tools and supplies
suitable to collect and contain fluids on Caterpillar
products.
Dispose of all fluids according to local regulations and
mandates.
4. Remove the pump and replace both plugs.
The Quicklub Lubrication System

Reference: Before any service work is performed on
the lubrication system, refer to Special Instructions,
REHS1396 or consult your Caterpillar dealer.
Filling the Reservoir

1. Fill the reservoir through the grease fitting. The
grease fitting is located at the base of the reservoir.
Reference: For the correct type of grease, refer
to Operation and Maintenance Manual, Lubricant
Viscosities.
Illustration 135
g01092743
Front Filter
2. Refill the reservoir when the grease reaches the

MIN mark on the reservoir.
3. Fill the reservoir to the MAX mark on the
reservoir.
Priming the System

After the reservoir has been filled with the
recommended lubricant, loosen the fitting to the
supply line. Operate the pump until lubricant flows
from the outlet. Then, tighten fitting.
Illustration 136
g01092745
Rear Filter
The filters are located under the access door on the

left cab platform.
1. Stop the engine.
90
Maintenance Section
Axle Oscillation Bearings - Lubricate
SEBU7198-07
2. Use a strap type wrench to remove the filters.

Dispose of the used filters properly.
3. Clean the filter mounting bases. Make sure that
all of the used seal is removed from each filter
mounting base.
i02154627
Axle Oscillation Bearings Lubricate

SMCS Code: 3268-086-BD; 3278-086-BD
Illustration 137
g00101318
4. Apply a thin coat of clean differential oil to the

seal of each new oil filter. Install each new oil filter
hand tight until the seals of the oil filters contacts
each base. Note the position of each index mark
on each filter in relation to a fixed point on each
filter base.
Illustration 138
g01092451
Illustration 139
g01092452
Note: There are rotation index marks on each oil

filter that are spaced 90 degrees or 1/4 of a turn away
from each other. When you tighten each oil filter, use
the rotation index marks as a guide.
5. Tighten each filter according to the instructions
that are printed on each filter. Use the index marks
as a guide. For non-Caterpillar filters, use the
instructions that are provided with the filter.
Note: You may need to use a Caterpillar strap
wrench, or another suitable tool, in order to turn
the filter to the amount that is required for final
installation. Make sure that the installation tool does
not damage the filter.
Apply lubricant through the two remote fittings on the

right side of the machine. Fitting (1) applies grease
to the rear axle oscillation bearing. Fitting (2) applies
grease to the front axle oscillation bearing.
6. Start the engine and run the engine at low idle.

Check for leaks.
7. Check the level of the differential oil.
Reference: Refer to Operation and Maintenance
Manual, Differential and Final Drive Oil Level Check for the correct procedure.
i02319912
Backup Alarm - Test

SMCS Code: 7406-081
S/N: 2TW1-Up
Turn the engine start switch key to the ON position in
order to perform the test.
Apply the service brake.
Move the transmission direction control lever to the
REVERSE position.
SEBU7198-07
91
Maintenance Section
Battery - Clean
The alarm should start to sound immediately. The

alarm will continue to sound until the transmission
direction control lever is moved to the NEUTRAL
position or to the FORWARD position.
i02155427
Battery - Clean
SMCS Code: 1401-070
Illustration 142
g01093084
Open the battery compartment on the right rear side

of the machine.
Illustration 140
g01091949
The backup alarm is located behind the rear grill.
Clean the battery terminals and the surfaces of

the batteries with a clean cloth. Coat the battery
terminals with petroleum jelly. Make sure that the
battery cables are installed securely.
i00993589
Battery - Recycle
SMCS Code: 1401-561
Always recycle a battery. Never discard a battery.
Always return used batteries to one of the following
locations:
A battery supplier
Illustration 141
g01117861
The volume for the backup alarm is nonadjustable.
An authorized battery collection facility

Recycling facility
92
Maintenance Section
Battery Hold-Down - Tighten
SEBU7198-07
i02155501
Battery Hold-Down - Tighten
7. Make any necessary repairs. If necessary, replace

the battery cables or the battery.
8. Connect the positive battery cable at the battery.
SMCS Code: 7257-527
9. Connect the negative battery cable at the battery.

10. Connect the battery cable at the battery
disconnect switch.
11. Install the key and turn the battery disconnect
switch ON.
i01916166
Belts - Inspect/Adjust/Replace
SMCS Code: 1397-025; 1397-040; 1397-510
Illustration 143
g01093110
Note: The alternator and the refrigerant compressor

are driven by a single serpentine belt.
Open the battery compartment on the right rear side

of the machine.
Over time, the vibration of an operating machine
can cause the battery hold-downs to loosen. To
help to prevent loose batteries and the possibility of
loose cable connections, tighten the eight nuts on
the two hold-downs to a torque of 2.50 0.25 Nm
(22 2 lb in).
i01770834
Battery or Battery Cable Inspect/Replace

SMCS Code: 1401-040; 1401-510; 1402-040;
1402-510
Illustration 144
g00935723
1. Stop the engine. Access the belt from the right

side of the machine.
1. Turn the engine start switch key OFF. Turn all of

the switches OFF.
2. Turn the battery disconnect switch OFF. Remove
the key.
3. Disconnect the negative battery cable from the
disconnect switch.
Note: Do not allow the disconnected battery cable to
contact the disconnect switch.
4. Disconnect the negative battery cable at the
battery.
5. Disconnect the positive battery cable at the
battery.
6. Inspect the battery terminals for corrosion. Inspect
the battery cables for wear or damage.
Illustration 145
g00998184
Note: The belt can be serviced via the engine access

door or the vent and the firewall can be removed for
easier access.
SEBU7198-07
93
Maintenance Section
Brake Accumulator - Check
2. Inspect the condition of belt (2). If the belt is

cracked or frayed, replace the belt.
3. Use a ratchet with a square head to loosen belt
tensioner (1) during replacement. Make sure
that the belt is installed in the correct pattern, as
shown.
i02215711
Brake Accumulator - Check

SMCS Code: 4263-535
1. Turn the engine start switch to the ON position.
The alert indicator for brake oil pressure should
come on if the braking system is not at normal
operating pressure. Refer to Operation and
Maintenance Manual, Monitoring System for the
location of the alert indicators.
2. Start the engine. Run the engine at half speed for
two minutes in order to increase the accumulator
pressure. The alert indicator for brake oil pressure
should go off.
3. Stop the engine. Apply the service brake pedal
and release the service brake pedal. The rate
for this process is 1 second on and 1 second
off. Do this process until the alert indicator
for brake oil pressure comes on. This will
decrease the accumulator pressure. A minimum
of five applications of the service brake pedal
are required with new discs. The number of
applications could be as low as three when the
lining material on the brake discs is at replacement
thickness.
4. If the alert indicator comes on after less than
3 applications of the brake, measure the
accumulator precharge pressure. An authorized
Caterpillar dealer can measure the nitrogen gas
pressure in the accumulator. Use only dry nitrogen
gas for recharging.
Reference: Refer to Testing and Adjusting,
RENR6365, 834H/836H Tier 3 Braking System,
Accumulator Charging Valve (Brake)-Test and
Adjustfor the correct procedure.
i01739721
Braking System - Test

SMCS Code: 4251-081; 4267-081
Fasten the seat belt before you test the brakes.

Park the machine on a dry, level surface.
Check the area around the machine. Make sure
that the machine is clear of personnel and clear of

obstacles.
Make sure that the steering frame lock is in the

unlocked position.
The following tests are used to determine whether

the braking system is functional. These tests are not
intended to measure the maximum brake holding
effort. The required brake holding effort for sustaining
a machine at a specific engine rpm varies from one
machine to another machine. The variations include
differences in the engine setting, the power train
efficiency, the brake holding ability, etc.
Service Brake Holding Ability Test
Personal injury can result if the machine moves

while testing.
If the machine begins to move during test, reduce
the engine speed immediately and engage the
parking brake.
1. Start the engine. Raise the implement slightly.
Apply the service brake. Release the parking
brake.
2. Move the transmission control to THIRD SPEED
FORWARD while the service brakes are applied.
Make sure that the autoshift control is in the OFF
position.
3. Gradually increase the engine speed to high idle.
The machine should not move.
4. Reduce the engine speed to low idle. Move the
transmission direction control to the NEUTRAL
position. Engage the parking brake. Lower the
implement to the ground. Stop the engine.
If the machine moved during the test, consult your
Caterpillar dealer for a brake inspection. Make any
necessary repairs before the machine is returned to
operation.
94
Maintenance Section
Bucket Cutting Edges - Inspect/Replace
SEBU7198-07
Parking Brake Holding Ability Test
Personal injury can result if the machine moves

while testing.
If the machine begins to move, reduce the engine
speed immediately and apply the service brake
pedal.
This test is performed when the parking brake is
engaged. If the machine begins to move, compare
the engine rpm to the engine rpm of a prior test. This
will indicate the amount of system deterioration.
1. Start the engine. Raise the implement slightly.
Engage the parking brake.
2. Move the transmission control to THIRD SPEED
FORWARD. Make sure that the autoshift control
is in the OFF position.
The parking brake indicator light should come on.
3. Gradually increase the engine speed to high idle.
The machine should not move.
4. Reduce the engine speed to low idle. Move the
transmission direction control to the NEUTRAL
position. Lower the implement to the ground. Stop
the engine.
If the machine moved during the test, consult your
Caterpillar dealer for a brake inspection. Make any
necessary repairs before the machine is returned to
operation.
i01548255
Bucket Cutting Edges Inspect/Replace

SMCS Code: 6801-040; 6801-510
Personal injury or death can result, if the bucket is

not blocked up. Block the bucket before changing
cutting edge.
Illustration 146
g00804790
Check for bolts that are missing or loose. Replace

any missing bolts and tighten any loose bolts.
Manual, Torques for Ground Engaging Tool Bolts
for the correct torque.
Inspect the cutting edges and the end bits. If wear or
damage is evident, use the following procedure to
replace the components.
1. Raise the bucket and place blocking under the
bucket. Lower the bucket onto the blocking.
Note: Do not block up the bucket too high. Block up
the bucket enough for removing the cutting edges
and the end bits.
2. Remove bolts (1). Remove cutting edges (2) and
the end bits.
3. Clean the contact surfaces. Inspect the cutting
edges and install the cutting edges.
If the opposite side of the cutting edge is not worn,
use that side. If both sides of the cutting edge are
worn, install a new cutting edge.
4. Install bolts (1). Tighten the bolts to the specified
torque.
5. Raise the bucket and remove the blocking. Lower
the bucket to the ground.
6. After a few hours of operation, check the bolts for
proper torque.
SEBU7198-07
95
Maintenance Section
Bucket Lift and Bucket Tilt Control - Inspect/Clean
i01923042
Bucket Lift and Bucket Tilt

Control - Inspect/Clean
SMCS Code: 5258-571; 5702-571
Illustration 147
g01000783
Note: Do not use any lubricants on any part of

this control. The moving parts of this control are
selflubricated.
Use the following procedure in order to clean the
control levers.
1. Disconnect the wiring from the controls.
i01916176
Bucket Stops - Inspect/Replace

SMCS Code: 6001-040-SQ; 6001-510-SQ;
6102-040-SQ; 6102-510-SQ
Illustration 148
g00554961
Check for bucket stops that are damaged or missing.

Replace the bucket stops, if necessary.
Note: Recalibrate the tilt position sensor after you
recalibrate the bucket stops. Refer to Operation and
Maintenance Manual, Position Sensor for the Tilt
Linkage (Caterpillar Monitoring System) - Calibrate
for more information.
2. Disassemble the controls.
i02105676
3. Wash the parts with warm soapy water.
Bucket Tips - Inspect/Replace
4. Rinse the parts thoroughly with water.
SMCS Code: 6805-040; 6805-510
5. Dry the parts thoroughly.

6. Reassemble the controls.
7. Reconnect the wiring to the controls.
Personal injury or death can result from the bucket

falling.
Block the bucket before changing bucket tips.
96
Maintenance Section
Bucket Tips - Inspect/Replace
SEBU7198-07
Bucket Tips
Illustration 151
Illustration 149
g00101352
(1) Usable
(2) Replace
(3) Replace
g00590819
(6) Retainer
(7) Retaining washer
(8) Adapter
2. Clean the adapter and the pin.
Check the bucket tips for wear. If the bucket tip has a
hole, replace the bucket tip.
1. Remove the pin from the bucket tip. The pin can
be removed by one of the following methods.
3. Fit retainer (6) into retaining washer (7). Install

this assembly into the groove that is in the side
of adapter (8).
Use a hammer and a punch from the retainer

side of the bucket to drive out the pin.
Use a Pin-Master. Follow Step 1.a through Step

1.c for the procedure.
Illustration 152
g00101359
4. Install the new bucket tip onto the adapter.

Note: The bucket tip can be rotated by 180 degrees in
order to allow greater penetration or less penetration.
Illustration 150
g00590670
(4) Back of Pin-Master

(5) Extractor
a. Place the Pin-Master on the bucket tooth.

b. Align extractor (5) with the pin.
c. Strike the Pin-Master at the back of the tool
(4) and remove the pin.
5. Drive the pin through the bucket tip. The pin can
be installed by using one of the following methods:
From the other side of the retainer, drive the
pin through the bucket tip, the adapter, and the

retainer.
Use a Pin-Master. Follow Step 5.a through Step

5.e for the procedure.
Note: To correctly install the pin into the retainer, the

pin must be driven in from the right side of the tooth.
Improper installation of the pin can result in the loss
of the bucket tip.
SEBU7198-07
97
Maintenance Section
Bucket Wear Plates - Inspect/Replace
Before damage to the bottom of the bucket occurs,

repair damaged bucket wear plates or replace
damaged bucket wear plates.
Consult your Caterpillar dealer for the procedures.
i01908538
Cab Air Filter - Clean/Replace

SMCS Code: 7342-070; 7342-510
Note: Clean the cab air filters more often if the
machine is being operated in dusty conditions.
Illustration 153
g00590666
(4) Back of Pin-Master

(9) Pin setter
(10) Pin holder
a. Insert the pin through the bucket tooth.

b. Place the Pin-Master over the bucket tooth and
locate the pin in the hole of holder (10).
c. Strike the tool with a hammer at the back of the
tool (4) in order to start the pin.
d. Slide pin holder (10) away from the pin and
rotate the tool slightly in order to align pin setter
(9) with the pin.
Illustration 155
e. Strike the end of the tool until the pin is fully

inserted.
1. Remove the filter cover behind the seat. Remove

the filter element.
6. After you drive the pin, make sure that the retainer
fits snugly into the pin groove.
2. Open the access door on the left side of the cab.

Remove the filter element.
i01098709
Bucket Wear Plates Inspect/Replace
g00994599
3. Clean the filter elements with pressure air or

wash the filter elements in warm water with a
nonsudsing household detergent.
4. If water and detergent are used to clean the filter
elements, rinse the filter elements in clean water
and allow the filter elements to air dry thoroughly.
SMCS Code: 6120-040; 6120-510
Note: If either filter element is damaged, install a

new filter element.
5. Install the filter elements. Install the filter cover
and close the access door.
Illustration 154
g00577650
98
Maintenance Section
Case Drain Oil Filters - Replace
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i01543124
i02155537
Case Drain Oil Filters - Replace

(If Equipped)
Circuit Breakers - Reset
SMCS Code: 5091-510
Circuit Breakers Depress the button

in order to reset the circuit breaker. If the
circuit is functioning properly, the button
will remain depressed. If the button will not remain
depressed, check the appropriate electrical circuit.
SMCS Code: 1420-529
Illustration 157
Illustration 156
g00801622
(1) Case drain filter for the steering pump. (2) Case drain filter for
the implement pump. (3) Case drain filter for the fan motor.
The case drain filters are located under the access

door in the platform behind the cab.
1. Stop the engine.
2. Use a strap type wrench to remove the filter
element. Dispose of the used filter element
properly.
3. Clean the filter mounting base. Make sure that
all of the used gasket is removed from the filter
mounting base.
4. Lubricate the gasket of a new filter element with
clean hydraulic oil.
5. Install the new filter element by hand. When the
gasket contacts the filter mounting base, tighten
the filter element by an additional 3/4 turn.
6. Repeat the above steps for the other two case
drain filters.
7. Start the engine and run the engine at low
idle. Operate the steering, the brakes, and the
implement.
8. Stop the engine. Inspect the filters for leaks. Make
any necessary repairs.
g01093167
The circuit breakers are located under a small access

door on the right cab platform.
Main Circuit (1) 105 amp
Alternator (2) 105 amp
Engine Start Switch (3) 10 amp
Electronic Control Module (ECM) (4)

15 amp
SEBU7198-07
99
Maintenance Section
Cooling System Coolant (ELC) - Change
i02156049
Cooling System Coolant (ELC)

- Change
If an Extended Life Coolant was previously used,

flush the cooling system with clean water. No other
cleaning agents are required. Use the following
procedure to change the cooling system coolant
(ELC).
SMCS Code: 1350-044-NL
Pressurized system: Hot coolant can cause serious burn. To open cap, stop engine, wait until radiator is cool. Then loosen cap slowly to relieve
the pressure.
NOTICE
products.
Illustration 158
g01093449
The cooling system pressure cap is located on the

left side of the machine on the top of the radiator.
1. Slowly loosen the cooling system pressure cap
in order to relieve system pressure. Remove the
cooling system pressure cap.

mandates.
NOTICE
Topping off or mixing Cat ELC with other products that
do not meet Caterpillar EC-1 specifications reduces
the effectiveness of the coolant and shortens coolant
service life.
Use only Caterpillar products or commercial products
that have passed the Caterpillar EC-1 specification for
pre-mixed or concentrate coolants. Use only Extender
with Cat ELC.
g01093450
Failure to follow these recommendations can result in

shortened cooling system component life.
Illustration 159
Reference: For information about the addition of

Extender to your cooling system, refer to Operation
and Maintenance Manual, Cooling System Coolant
Extender (ELC) - Add or consult your Caterpillar
dealer.
2. If equipped, remove the bottom guard in order to

access the coolant drain valve.
If you change the coolant of a machine to Extended

Life Coolant from another type of coolant, use a
Caterpillar cleaning agent to flush the cooling system.
After you drain the cooling system, thoroughly flush
the cooling system with clean water. All of the
cleaning agent must be removed from the cooling
system.
4. Flush the cooling system with clean water until the

draining water is transparent.
The drain valve is located at the rear of the machine under the
engine compartment.
3. Open the drain valve. Allow the coolant to drain

into a suitable container.
5. Close the drain valve. Replace the bottom guard,

if equipped.
6. Replace the water temperature regulator.
100
Maintenance Section
Cooling System Coolant Extender (ELC) - Add

Manual, Cooling System Water Temperature
Regulator - Replace for the correct procedure.
7. Add the coolant solution.
Manual, Capacities (Refill) for the capacity of
the cooling system.
8. Start the engine. Run the engine without the
cooling system pressure cap until the water
temperature regulator opens and the coolant level
stabilizes.
9. Check the coolant level.
Manual, Cooling System Level - Check for the
correct procedure.
SEBU7198-07
NOTICE
service life.
with Cat ELC.
When a Caterpillar Extended Life Coolant (ELC) is
used, an Extender must be added to the cooling
system.
10. Install the cooling system pressure cap. Stop the

engine.
i02156106
Cooling System Coolant

Extender (ELC) - Add
SMCS Code: 1352-544-NL
the pressure.
NOTICE
Illustration 160
g01093449
The cooling system pressure cap is located on the

left side of the machine on the top of the radiator.
1. Slowly loosen the cooling system pressure cap
in order to relieve system pressure. Remove the
cooling system pressure cap.
2. Use a 8T-5296 Coolant Test Kit to check the
concentration of the coolant. If it is necessary,
adjust the concentration of the coolant.

products.
mandates.
Illustration 161
g01093450
SEBU7198-07
101
Maintenance Section
Cooling System Coolant Sample (Level 1) - Obtain
3. If necessary, drain enough coolant from the

radiator in order to allow the addition of the
Extender. The coolant drain valve is located
at the rear of the machine under the engine
compartment.
Note: Level 1 results may indicate a need for

Level 2 Analysis.
4. Add 3 L (100 fl oz) of Extender to the cooling

system.
5. Check the coolant level.
Manual, Cooling System Level - Check for the
correct procedure.
6. Install the cooling system pressure cap.
Illustration 162
g00545995
i02279454

Sample (Level 1) - Obtain
SMCS Code: 1350-008; 1395-008; 7542
Note: It is not necessary to obtain a Coolant
Sample (Level 1) if the cooling system is filled
with Cat ELC (Extended Life Coolant). Cooling
systems that are filled with Cat ELC should have
a Coolant Sample (Level 2) that is obtained at
the recommended interval that is stated in the
Maintenance Interval Schedule.
Note: Obtain a Coolant Sample (Level 1) if the
cooling system is filled with any other coolant
instead of Cat ELC. This includes the following
types of coolants.
Obtain the sample of the coolant as close as possible

to the recommended sampling interval. In order
to receive the full effect of SOS analysis, you
must establish a consistent trend of data. In order
to establish a pertinent history of data, perform
consistent samplings that are evenly spaced.
Supplies for collecting samples can be obtained from
your Caterpillar dealer.
Use the following guidelines for proper sampling of
the coolant:
Complete the information on the label for the

sampling bottle before you begin to take the
samples.
Keep the unused sampling bottles stored in plastic

bags.
Commercial long life coolants that meet the
Obtain coolant samples directly from the coolant
Cat Diesel Engine Antifreeze/Coolant (DEAC)
Keep the lids on empty sampling bottles until you
Caterpillar Engine Coolant Specification -1

(Caterpillar EC-1)
Commercial heavy-duty coolant/antifreeze

NOTICE
products.
mandates.
sample port. You should not obtain the samples

from any other location.
are ready to collect the sample.
Place the sample in the mailing tube immediately

after obtaining the sample in order to avoid
contamination.
Never collect samples from expansion bottles.

Never collect samples from the drain for a system.
Submit the sample for Level 1 analysis.
For additional information about coolant analysis, see
Special Publication, SEBU6250, Caterpillar Machine
Fluids Recommendations or consult your Caterpillar
dealer.
102
Maintenance Section
SEBU7198-07
i01917168
i02281837

Sample (Level 2) - Obtain
Cooling System Coolant Level

- Check
SMCS Code: 1350-008; 1395-008; 7542
SMCS Code: 1350-535-FLV
NOTICE
products.
mandates.
Illustration 163
g00545995
Obtain the sample of the coolant as close as possible

to the recommended sampling interval. Supplies
for collecting samples can be obtained from your
Caterpillar dealer.
Illustration 164
g00551021
Illustration 165
g00500295
The sight gauge is located on the left side of the

machine. The sight gauge can be viewed through the
vents on the left side of the machine.
1. Maintain the coolant level within the sight gauge.
Refer to Operation and Maintenance Manual,

for the guidelines for proper sampling of the coolant.
Submit the sample for Level 2 analysis.
Reference: For additional information about coolant
analysis, refer to Special Publication, SEBU6250,
Caterpillar Machine Fluids Recommendations or
consult your Caterpillar dealer.
Illustration 166
g00545995
SEBU7198-07
103
Maintenance Section
Cooling System Water Temperature Regulator - Replace
NOTICE
service life.
with Cat ELC.
2. If the coolant level is low, slowly remove the
cooling system pressure cap on the top left side
of the machine and add the required coolant in
order to maintain the coolant level within the sight
gauge.
The water temperature regulator should be replaced

after the cooling system has been cleaned. Replace
the water temperature regulator and replace the
seals while the cooling system is completely drained
or while the cooling system coolant is drained to a
level that is below the water temperature regulator
housing.
Note: If you are only replacing the water temperature
regulator, drain the cooling system coolant to a
level that is below the water temperature regulator
housing.
NOTICE
Failure to replace the engines thermostat on a regularly scheduled basis could cause severe engine damage.
Note: If it is necessary to add coolant daily, check

for leaks.
3. Inspect the cooling system pressure cap and the
cap seal. Clean the cap and install the cap. If the
cap is damaged, install a new cooling system
pressure cap.
4. Inspect the radiator core for debris. Clean the
radiator core, if necessary.
Manual, Radiator Core - Clean for more
information.
Illustration 167
g00546349
The water temperature regulator is located on the left

side of the engine near the fuel filter.
i01629860
Cooling System Water

Temperature Regulator Replace
SMCS Code: 1355-510; 1393-010
the pressure.
Replace the water temperature regulator on a regular
basis in order to reduce the chance of unscheduled
downtime and the chance of problems with the
cooling system.
Illustration 168
g00844391
1. Remove bolts (1) and cover (2). Remove all of the

used gasket from the regulator housing.
2. Remove the elbow and water temperature
regulator (3).
104
Maintenance Section
Crankshaft Vibration Damper - Inspect
SEBU7198-07
NOTICE
Caterpillar engines incorporate a shunt design cooling
system and require operating the engine with a thermostat installed.
If the thermostat is installed wrong, it will cause the
engine to overheat. Inspect gaskets before assembly
and replace if worn or damaged.
3. Install a new gasket on the regulator housing.
Install a new water temperature regulator.
The vibration damper can be used again if none of

the above conditions are found and the damper is
not damaged.
Inspect the vibration damper for dents in the outer
case. Dents in the outer case may cause failure of
the damper. Install a new vibration damper if the
damper is damaged.
Reference: Refer to the Disassembly and Assembly
manual for your machines engine for the necessary
replacement procedure.
4. Install the bolts and the cover.
i01830728
i01923122
Crankshaft Vibration Damper

- Inspect
Differential and Final Drive Oil

- Change
SMCS Code: 3278-044; 4050-044
NOTICE
SMCS Code: 1205-040

products.
mandates.
Illustration 169
g01000821
The crankshaft vibration damper is located at the

rear end of the engine compartment.
Damage to the vibration damper or failure of the
vibration damper will increase torsional vibrations.
These vibrations will result in damage to the
crankshaft and to other engine components. A
deteriorating vibration damper will cause excessive
gear train noise at variable points in the speed range.
Caterpillar recommends replacing the vibration
damper for any of the following reasons:
The engine has had a failure because of a broken

crankshaft.
The SOS oil analysis detected a worn crankshaft

front bearing.
The SOS oil analysis detected a large amount of

gear train wear that is not caused by a lack of oil.
Illustration 170
Final Drive
g00801038
SEBU7198-07
105
Maintenance Section
Differential and Final Drive Oil Level - Check
8. If the specified amount of oil will not fit in the final

drives, install the final drive filler plugs. Operate
the machine on level ground for a few minutes in
order to equalize the oil level in the axles.
9. Remove the final drive filler plugs and add the
remaining oil. The oil level should reach the
bottom of the filler plug opening.
Note: If the oil level is higher than the filler plug
opening, do not allow the oil to drain to the proper
level. Install the filler plug.
Illustration 171
g00840713
Front Differential
1. Position the wheels so that the front final drive

drain plugs (2) are facing downward. Remove
the front final drive drain plugs (2) and the front
differential drain plug (4). Allow the oil to drain into
a suitable container.
2. Remove the front final drive filler plugs (1) and the
front differential filler plug (3).
3. After the oil has drained, clean the drain plugs and
install the drain plugs.
4. Fill the final drives to the bottom of the filler plug
openings.
Manual, Lubricant Viscosities and Refill
Capacities for the correct type of oil and for the
correct amount of oil.
i01624405

Level - Check
SMCS Code: 3278-535-FLV; 4050-535-FLV
NOTICE
products.
mandates.
5. Add three 1 L (1.1 qt) bottles of 1U-9891

Hydraulic Oil Additive to the differential.
6. Clean the filler plugs and install the filler plugs.
Illustration 173
Illustration 172
g00840708
Rear Differential Filler Plug (3)
7. Repeat steps 2 through 6 for the rear final drives

and the rear differential.
g00801038
1. Position the wheels so that final drive drain plug

(2) is facing downward. Remove oil filler plug (1).
The oil level should be at the bottom of the filler
plug opening. Add oil, if necessary.
Manual, Lubricant Viscosities for the correct type
of oil.
106
Maintenance Section
Differential and Final Drive Oil Sample - Obtain
If the oil level is higher than the filler plug opening,

do not allow the oil to drain to the proper level.
Install the filler plug.
SEBU7198-07
i02339342

Sample - Obtain
SMCS Code: 3278-008; 4050-008; 4070-008; 7542
NOTICE
Always use a designated pump for oil sampling, and
use a separate designated pump for coolant sampling.
Using the same pump for both types of samples may
contaminate the samples that are being drawn. This
contaminate may cause a false analysis and an incorrect interpretation that could lead to concerns by both
dealers and customers.
Illustration 174
g00801039
Front Differential
NOTICE
products.
mandates.
Illustration 175
g00840708
Rear Differential
1. Operate the machine for a few minutes before

obtaining the oil sample. This will thoroughly mix
the oil for a more accurate sample.
2. Remove differential filler plug (3). The oil level

should be at the bottom of the filler plug opening.
Add oil, if necessary.
Manual, Lubricant Viscosities for the correct type
of oil.
If the oil level is higher than filler plug opening, do
not allow the oil to drain to the proper level. Install
filler plug (3).
Illustration 176
Differential Filler Plug
g01167372
SEBU7198-07
107
Maintenance Section
Drive Shaft Support Bearing - Lubricate
The fitting for the drive shaft support bearing is

located toward the front of the articulation joint.
Apply lubricant through one fitting.
i02061807
Electronic Unit Injector Inspect/Adjust

SMCS Code: 1251-025; 1251-040; 1290-025;
1290-040
Illustration 177
g00760182
Final Drive Filler Plug
2. The differential and final drives are not equipped

with sampling valves. Obtaining an oil sample will
require the use of a vacuum pump or equivalent
in order to extract the oil from the component.
Extract the oil through the filler openings on the
differential and final drives.
Note: This procedure requires a sample for each
final drive and each differential. There will be a
total of three samples per axle and six samples for
this procedure in total. Make sure that you properly
record the location of each oil sample.
Reference: For more information, refer to Special
Publication, SEBU6250, Caterpillar Machine
Fluids Recommendations and Special Publication,
PEHP6001, How To Take A Good Oil Sample.
i02156189
Drive Shaft Support Bearing Lubricate
The Electronic Control module produces high

voltage. To prevent personal injury make sure the
Electronic Control Module is not powered and the
unit injector solenoids are disconnected.
NOTICE
The camshafts must be correctly timed with the crankshaft before an adjustment of the unit injector lash
is made. The timing pins must be removed from the
camshafts before the crankshaft is turned or damage
to the cylinder block will be the result.
The operation of Caterpillar engines with improper
adjustments of the electronic unit injector can reduce
engine efficiency. This reduced efficiency could result
in excessive fuel usage and/or shortened engine
component life.
Adjust the electronic unit injector at the same interval
as the valve lash adjustment.
Refer to your machines Service Manual or your
Caterpillar dealer for the complete adjustment
procedure.
SMCS Code: 3267-086-BD

Wipe off the fitting before any lubricant is applied.
i01902270
Engine Air Filter Primary

Element - Clean/Replace
SMCS Code: 1054-070-PY; 1054-510-PY
To avoid personal injury, always wear eye and face

protection when using pressurized air.
Illustration 178
Center Drive Shaft
g01093575
108
Maintenance Section
Engine Air Filter Primary Element - Clean/Replace
SEBU7198-07
NOTICE
Caterpillar recommends certified air filter cleaning services that are available at Caterpillar dealers. The
Caterpillar cleaning process uses proven procedures
to assure consistent quality and sufficient filter life.
Observe the following guidelines if you attempt to
clean the filter element:
Do not tap or strike the filter element in order to remove dust.
Do not wash the filter element.
Use low pressure compressed air in order to remove
the dust from the filter element. Air pressure must not
exceed 207 kPa (30 psi). Direct the air flow up the
pleats and down the pleats from the inside of the filter
element. Take extreme care in order to avoid damage
to the pleats.
Do not use air filters with damaged pleats, gaskets, or
seals. Dirt entering the engine will cause damage to
engine components.
NOTICE
Service the air filter only with the engine stopped. Engine damage could result.
Illustration 180
g00101415
3. Remove the primary filter element from the air

cleaner housing. In order to remove the engine air
filter primary element, pull the element outward.
While you pull the element outward, rock the
element.
Use Steps 4 through 6 in order to clean the
primary element:
4. Inspect the primary element. If the pleats, the
gaskets, or the seals are damaged, discard the
element. Replace a damaged primary element
with a clean primary element.
1. Open the engine compartment. The air filter is

located on the right side of the machine.
Illustration 181
Illustration 179
g00845360
2. Loosen the cover latches and remove the air

cleaner cover.
Note: The latches for the air cleaner housing may
snap open when you release the latches.
g00328468
5. If the primary element is not damaged, clean the

primary element.
Pressurized air can be used to clean a primary
element that has not been cleaned more than two
times. Use filtered, dry air at a maximum pressure
of 207 kPa (30 psi).
Note: Pressurized air will not remove deposits of
carbon and oil.
6. When you clean the primary element, always
begin in the inside of the element (clean side).
This will force dirt particles toward the outside of
the element (dirty side).
SEBU7198-07
109
Maintenance Section
Engine Air Filter Secondary Element - Replace
Direct the air along the length (inside) of the filter.

This will help prevent damage to the paper pleats.
Note: Do not aim the stream of air directly at the
primary element. Dirt could be forced further into the
pleats.
Use Steps 7 through 10 in order to inspect the
primary element:
12. Clean the cover for the air cleaner housing. Align
the slot on the cover with the pin on the air cleaner
housing. Install the cover.
13. Close the engine.
i01625408
Engine Air Filter Secondary

Element - Replace
SMCS Code: 1054-510-SE
NOTICE
Service the air filter only with the engine stopped. Engine damage could result.
NOTICE
Always replace the secondary element. Do not attempt to reuse it by cleaning. Engine damage could
result.
Illustration 182
g00328470
7. Place a light bulb inside the filter element. Use a

60 watt blue light in a dark room or in a similar
facility. Inspect the primary element for light that
may show through the filter material.
8. Inspect the primary element while you rotate the
element. Inspect the primary element for tears
and/or holes. Do not use a primary element that
has any tears and/or holes in the filter material. Do
not use a primary element with damaged pleats,
gaskets, or seals.
Note: Replace the secondary element when you

service the primary element for the third time. If
a clean primary element has been installed but a
warning for the air filter still occurs, replace the
secondary element. Also replace the secondary
element if the exhaust smoke remains black after
installation of a clean primary element.
9. If it is necessary, compare the primary element

to a new primary element. Use a new primary
element that has the same part number. This may
be necessary in order to confirm the results of the
inspection.
10. Discard a damaged primary element.
Use Steps 11 through 13 to install a clean
primary element:
NOTICE
Do not use a filter if the pleats, the gaskets or the seals
are damaged.
11. Install a clean primary filter element over the
engine air filter secondary element. Apply firm
pressure to the end of the primary element as
you gently rock the filter element. This seats the
primary element.
Illustration 183
g00841360
1. Open the engine access door on the right side of

the machine.
110
Maintenance Section
Engine Air Filter Service Indicator - Inspect
Illustration 184
SEBU7198-07
g00804954
Illustration 187
g00841372
4. Cover the air inlet opening. Clean the inside of

the air filter housing.
5. Inspect the gasket between the air inlet pipe and
the air cleaner housing. Replace the gasket if the
gasket is damaged.
6. Uncover the air inlet opening. Install a new
secondary filter element.
7. Install a clean primary element and install the
cover on the air filter housing. Fasten the clips in
order to secure the cover.
Illustration 185
g00804960
8. Close the engine access door.
2. Remove cover (1) and primary element (2).

i01549255

Manual, Engine Air Filter Primary Element Clean/Replace for the correct procedure for
servicing the primary element.
Engine Air Filter Service

Indicator - Inspect
SMCS Code: 7452-040
NOTICE
Service the air cleaner only with the engine stopped.
Engine damage could result.
Illustration 186
3. Remove the secondary filter element.
g00805000
SEBU7198-07
111
Maintenance Section
Engine Air Filter Service Indicator - Inspect/Replace
Open the access door on the left side of the machine.

To check the condition of the service indicator, try
resetting the service indicator. This should require
less than three pushes of the reset button.
Next, check the movement of the yellow piston in the
service indicator. Start the engine and accelerate
the engine to high idle for a few seconds. After
the governor control pedal is released, the yellow
piston should remain at the highest position that was
achieved during acceleration.
If either of these conditions are not met, replace the
service indicator.
i01625411
Engine Air Precleaner - Clean

Illustration 188
g00804672
Open the engine access door on the left side of the

machine.
SMCS Code: 1055-070

NOTICE
Service the air cleaner only with the engine stopped.
Engine damage could result.
The air filter service indicator is located on the air

inlet line.
If the yellow piston in the filter service indicator is in
the red zone, service the air cleaner.
i01548088
Engine Air Filter Service

Indicator - Inspect/Replace
SMCS Code: 7452-040; 7452-510
Illustration 190
g00841375
1. Remove the precleaner.

2. Inspect the air inlet screen for dirt and for trash.
Remove the screen. Clean the screen if the
screen is dirty.
3. Inspect the precleaner tube openings. Remove
dirt and debris.
4. Clean the precleaner with compressed air or wash
the precleaner in warm water. Dry all the parts.
5. Install the precleaner screen.
Illustration 189
g00804672
112
Maintenance Section
Engine Crankcase Breather - Clean
SEBU7198-07
i01647648
Engine Crankcase Breather Clean

SMCS Code: 1317-070
3. Wash the breather in a clean, nonflammable

solvent. Inspect the breather and the seal for
damage. Replace the seal, if necessary.
4. Use pressure air to dry the breather.
5. Install seal (3). Install breather (4), the washers
and bolts (6).
S/N: 2TW1-Up
Note: The engine crankcase breather on the
988G(S/N: BNH1-Up) is located inside the valve
cover. This breather does not require a maintenance
interval. Caterpillar recommends replacing the
crankcase breather during an engine overhaul. In
order to replace the breather element, the valve
cover will need to be replaced.
6. Install hose (5) on the breather and tighten hose

clamp (2). Connect sensor (1) to breather (4).
i01062428
Engine Mounts - Inspect

SMCS Code: 1152-040
NOTICE
Attempts to clean the engine crankcase breather on
the 988G(S/N: BNH1-Up) may cause damage to the
element.
Illustration 192
g00552201
Caterpillar recommends checking the engine mounts

for deterioration. Checking the engine mounts will
ensure that the bolts have the proper torque. This
will prevent excessive engine vibration that is caused
from improper mounting.
Reference: For the proper bolt torques, refer to the
Specifications manual for your machines engine.
Illustration 191
g00844437
The engine crankcase breather on the 988G(S/N:

2TW1-Up) is located on the left side of the engine
near the fuel priming pump.
1. Disconnect sensor (1) from breather (4). Loosen
hose clamp (2) and remove hose (5) from the
breather.
2. Remove bolts (6), the washers and breather (4).
Remove seal (3).
SEBU7198-07
113
Maintenance Section
Engine Oil (High Speed) and Oil Filter - Change
i02356181
Table 10
Engine Oil (High Speed) and

Oil Filter - Change
(If Equipped)
SMCS Code: 1318-510-HZ
Selection of the Oil Change Interval

NOTICE
A 500 hour engine oil change interval is available, provided that the operating conditions and recommended multigrade oil types are met. When these requirements are not met, shorten the oil change interval
to 250 hours, or use an SOS Services oil sampling
and analysis program to determine an acceptable oil
change interval.
If you select an interval for oil and filter change that is
too long, you may damage the engine.
Engine Oil Change Intervals(1)

Operating Conditions
Severe
Normal(2)
Multigrade
Oil Type
Abnormally harsh operating cycles or harsh

environments can shorten the service life of
the engine oil. Arctic temperatures, corrosive
environments, or extremely dusty conditions may
require a reduction in engine oil change intervals
from the recommendations in Table 10. Also refer
to Special Publication, SEBU5898, Cold Weather
Recommendations. Poor maintenance of air filters
or of fuel filters requires reduced oil change intervals.
See your Caterpillar dealer for more information if this
product will experience abnormally harsh operating
cycles or harsh environments.
Fuel
Sulfur
from
0.3% to
0.5%
Altitude
above
1830 m
(6000 ft)
(4)
Cat DEO
Preferred
500 hr
500 hr
500 hr
250 hr(6)
Cat ECF-1
11.0
minimum
TBN(4)
Preferred
500 hr
500 hr
500 hr
250 hr(6)
Cat ECF-1
TBN(4)
below 11.0
500 hr
500 hr
250 hr(5)
250 hr(6)
API CG-4
250 hr
250 hr(5)
250 hr(5)
250 hr(6)
Caterpillar oil filters are recommended.

Recommended multigrade oil types are listed in Table
10. Do not use single grade oils.
High
Load
Factor(3)
above
69 L (17
US gal)
per hr
of fuel
(1)
(2)
(3)
(4)
(5)
(6)
The traditional oil change interval for engines is 250 hours. The
standard oil change interval in this machine is 500 hours, if the
operating conditions and recommended oil types that are listed
in this table are met. Improvements in the engine allow this
engine oil change interval. This new standard interval is not
permitted for other machines. Refer to the applicable Operation
and Maintenance Manuals for the other machines.
Normal conditions include these factors: Fuel sulfur below
0.3%, altitude below 1830 m (6000 ft), and good air filter and
fuel filter maintenance. Normal conditions do not include high
load factor, harsh operating cycles, or harsh environments.
High load factors can shorten the service life of your engine oil.
Continuous heavy load cycles and very little idle time result
in increased fuel consumption and oil contamination. These
factors deplete the oil additives more rapidly. If the average
fuel consumption of your machine exceeds 69 L (17 US gal)
per hour, follow the High Load Factor recommendations in
Table 10. To determine average fuel consumption, measure
average fuel consumption for a period of 50 to 100 hours. If
the application of the machine is changed, the average fuel
consumption may change.
For sulfur content above 0.5%, refer to Operation and
Maintenance Manual, SEBU6250, Total Base Number (TBN)
and Fuel Sulfur Levels for Direct Injection (DI) Diesel Engines.
In order to verify an oil change interval of 500 hours, refer to
Program A below.
Use Program B below to determine an appropriate interval.
Adjustment of the Oil Change Interval

Note: Your Caterpillar dealer has additional
information on these programs.
Program A
Verification for an Oil Change Interval of 500 Hours
114
Maintenance Section
Engine Oil (High Speed) and Oil Filter - Change
SEBU7198-07
This program consists of three oil change intervals of

500 hours. Oil sampling and analysis is done at 250
hours and 500 hours for each of the three intervals
for a total of six oil samples. The analysis includes
oil viscosity and infrared (IR) analysis of the oil. If
all of the results are satisfactory, the 500 hour oil
change interval is acceptable for the machine in that
application. Repeat Program A if you change the
application of the machine.
NOTICE
If a sample does not pass the oil analysis, take one

of these actions:

Dealer Service Tool Catalog for tools and supplies
products.
Shorten the oil change interval to 250 hours.

Proceed to Program B.
Change to a preferred oil type in Table 10.
Program B
Optimizing Oil Change Intervals

mandates.
Your machine may be equipped with a high speed
arrangement for changing the engine oil. The high
speed arrangement allows the engine oil to be
changed faster than the conventional method.
Begin with a 250 hour oil change interval. The oil

change intervals are adjusted by increments. Each
interval is adjusted an additional 50 hours. Periodic oil
sampling and analysis is done during each interval.
The analysis includes oil viscosity and infrared (IR)
analysis of the oil. Repeat Program B if you change
the application of the machine.
If an oil sample does not pass the analysis, shorten
the oil change interval, or change to a preferred
multigrade oil type in the listing above.
References
Reference: Form, PEDP7035, Optimizing Oil
Change Intervals
Illustration 193
g00841360
Illustration 194
g01000950
Reference: Form, PEDP7036, SOS Fluid Analysis

Reference: Form, PEDP7076, Understanding the
SOS Oil Analysis Tests
Procedure for Changing the Engine

Oil and Filter
Hot oil and components can cause personal injury.

Do not allow hot oil or components to contact
skin.
1. Open the engine access door on the right side

of the machine. The high speed arrangement
is located on the right side of the engine
compartment.
SEBU7198-07
115
Maintenance Section
Engine Oil Level - Check
2. Remove the cap that protects the male coupler.

Connect an oil pump to the male coupler. Turn on
the oil pump and withdraw the engine oil.
6. Apply a thin film of clean engine oil to the seal on

the new filter element. Install a new engine oil
filter hand tight until the seal of the engine oil filter
contacts the base. Note the position of the index
marks on the filter in relation to a fixed point on
the filter base.
Note: There are rotation index marks on the engine
oil filter that are spaced 90 degrees or 1/4 of a turn
away from each other. When you tighten the engine
oil filter, use the rotation index marks as a guide.
7. Tighten the filter according to the instructions
that are printed on the filter. Use the index marks
Illustration 195
g00841382
3. Open the engine access door on the left side of

the machine.

8. Clean the end of the male coupler for the high
speed arrangement. Connect an oil pump to the
male coupler for the high speed arrangement. Fill
the crankcase with oil.
Manual, Capacities (Refill) for the proper amount
of oil.
9. Clean the end of the male coupler for the high
speed arrangement. Clean the cap that covers the
male coupler and install the cap.
Illustration 196
g00546663
4. Use a strap type wrench to remove the engine oil

filter. Dispose of the used filter properly.
5. Clean the filter mounting base. Make sure that the
used seal is completely removed.
10. Start the engine and allow the oil to circulate.

Check for leaks.
11. Check the engine oil level.
Manual, Engine Oil Level - Check for the correct
procedure.
12. Close the engine access doors.
i02281851
Engine Oil Level - Check

NOTICE
Do not under fill or overfill engine crankcase with oil.
Either condition can cause engine damage.
Illustration 197
g00101318
116
Maintenance Section
Engine Oil Sample - Obtain
SEBU7198-07
i01917218
Engine Oil Sample - Obtain

SMCS Code: 1348-008; 7542
Illustration 198
g00841382

the machine.
Illustration 201
g00501726
Obtain a sample of the engine oil from the engine

oil sampling valve. The sampling valve is located
on the engine oil filter base on the left side of the
engine compartment. Refer to Special Publication,
SEBU6250, SOS Oil Analysis for information that
pertains to obtaining a sample of the engine oil.
Refer to Special Publication, PEHP6001, How To
Take A Good Oil Sample for more information about
obtaining a sample of the engine oil.
i02356182
Illustration 199
g00501649
2. Remove engine oil dipstick (2) and wipe the

dipstick with a clean cloth. Then, insert the dipstick
and remove the dipstick again. This will ensure
a more accurate measurement of the engine oil
level.
Illustration 200
g00999790
3. When the engine is stopped, maintain the oil level

within crosshatched region (A) of the dipstick. This
region of the dipstick is marked Safe Starting
Range.
4. If necessary, remove oil filler cap (1) and add oil.
Clean the oil filler cap and install the oil filler cap.
Engine Oil and Filter - Change

SMCS Code: 1318-510

NOTICE
A 500 hour engine oil change interval is available, provided that the operating conditions and recommended multigrade oil types are met. When these requirements are not met, shorten the oil change interval
to 250 hours, or use an SOS Services oil sampling
and analysis program to determine an acceptable oil
change interval.
If you select an interval for oil and filter change that is
too long, you may damage the engine.
Caterpillar oil filters are recommended.
Recommended multigrade oil types are listed in
Table 11. Do not use single grade oils.
SEBU7198-07
Abnormally harsh operating cycles or harsh

environments can shorten the service life of
the engine oil. Arctic temperatures, corrosive
environments, or extremely dusty conditions
may require a reduction in engine oil change
intervals from the recommendations in Table 11.
Also refer to Manual, SEBU5898, Cold Weather
Recommendations. Poor maintenance of air filters
or of fuel filters requires reduced oil change intervals.
See your Caterpillar dealer for more information if this
product will experience abnormally harsh operating
cycles or harsh environments.
117
Maintenance Section
Table 11
Engine Oil Change Intervals(1)

Operating Conditions
Severe
Normal(2)
Multigrade
Oil Type
High
Load
Factor(3)
above
69 L (17
US gal)
per hr
of fuel
Fuel
Sulfur
from
0.3%
to
0.5%
Altitude
above
1830 m
(6000
ft)
(4)
Cat DEO
Preferred
500 hr
500 hr
500 hr
250 hr(6)
Cat ECF-1
11.0
minimum
TBN(4)
Preferred
500 hr
500 hr
500 hr
250 hr(6)
Cat ECF-1
TBN(4) below
11.0
500 hr
500 hr
250
hr(5)
250 hr(6)
API CG-4
250 hr
250 hr(5)
250
hr(5)
250 hr(6)
(1)
(2)
(3)
(4)
(5)
(6)
The traditional oil change interval for engines is 250 hours. The
standard oil change interval in this machine is 500 hours, if the
operating conditions and recommended oil types that are listed
in this table are met. Improvements in the engine allow this
engine oil change interval. This new standard interval is not
permitted for other machines. Refer to the applicable Operation
and Maintenance Manuals for the other machines.
Normal conditions include these factors: Fuel sulfur below
0.3%, altitude below 1830 m (6000 ft), and good air filter and
fuel filter maintenance. Normal conditions do not include high
load factor, harsh operating cycles, or harsh environments.
High load factors can shorten the service life of your engine oil.
Continuous heavy load cycles and very little idle time result
in increased fuel consumption and oil contamination. These
factors deplete the oil additives more rapidly. If the average
fuel consumption of your machine exceeds 69 L (17 US gal)
per hour, follow the High Load Factor recommendations in
Table 11. To determine average fuel consumption, measure
average fuel consumption for a period of 50 to 100 hours. If
the application of the machine is changed, the average fuel
consumption may change.
For sulfur content above 0.5%, refer to Operation and
Maintenance Manual, SEBU6250, Total Base Number (TBN)
and Fuel Sulfur Levels for Direct Injection (DI) Diesel Engines.
In order to verify an oil change interval of 500 hours, refer to
Program A below.
Use Program B below to determine an appropriate interval.
Adjustment of the Oil Change Interval

Note: Your Caterpillar dealer has additional
information on these programs.
Program A
Verification for an Oil Change Interval of 500 Hours
118
Maintenance Section
This program consists of three oil change intervals of

500 hours. Oil sampling and analysis is done at 250
hours and 500 hours for each of the three intervals
for a total of six oil samples. The analysis includes
oil viscosity and infrared (IR) analysis of the oil. If
all of the results are satisfactory, the 500 hour oil
change interval is acceptable for the machine in that
application. Repeat Program A if you change the
application of the machine.
If a sample does not pass the oil analysis, take one
of these actions:
Shorten the oil change interval to 250 hours.

Proceed to Program B.
Change to a preferred oil type in Table 11.
SEBU7198-07
Procedure for Changing the Engine

Oil and Filter
NOTICE
Dealer Service Tool Catalog for tools and supplies
products.
mandates.
Program B
Optimizing Oil Change Intervals
Begin with a 250 hour oil change interval. The oil
change intervals are adjusted by increments. Each
increment is an additional 50 hours. Periodic oil
sampling and analysis is done during each interval.
The analysis includes oil viscosity and infrared (IR)
analysis of the oil. Repeat Program B if you change
the application of the machine.
If an oil sample does not pass the analysis, shorten
the oil change interval, or change to a preferred
multigrade oil type in the listing above.
Illustration 202
g00841391
Illustration 203
g00841390
References
Reference: Form, PEDP7035, Optimizing Oil
Change Intervals
Reference: Form, PEDP7036, SOS Fluid Analysis
Reference: Form, PEDP7076, Understanding the
SOS Oil Analysis Tests
1. Open the crankcase drain valve and allow the oil

to drain into a suitable container.
2. Close the drain valve.
SEBU7198-07
119
Maintenance Section
6. Apply a thin film of clean engine oil to the seal on

the new filter element. Install a new engine oil
filter hand tight until the seal of the engine oil filter
contacts the base. Note the position of the index
marks on the filter in relation to a fixed point on
the filter base.
Note: There are rotation index marks on the engine
away from each other. When you tighten the engine
Illustration 204
g00841382

the machine.
Illustration 205

g00546663
4. Use a strap type wrench to remove the engine oil

filter. Dispose of the used filter properly.
5. Clean the filter mounting base. Make sure that the
used gasket is completely removed.
Illustration 207
g00501649
8. Remove the engine oil filler cap (1) and fill the
engine crankcase with oil.
Manual, Capacities (Refill) for the proper
amount of oil.
9. Clean the oil filler cap and install the oil filler cap.
10. Start the engine and allow the oil to circulate.
Check for leaks.
11. Check the engine oil level on dipstick (2).
Illustration 206
g00101318

Manual, Engine Oil Level - Check for the correct
procedure.
120
Maintenance Section
Engine Valve Lash - Check
SEBU7198-07
i01648537
Engine Valve Lash - Check

SMCS Code: 1105-535
For the correct procedure, refer to the appropriate
Service Manual module for your machines engine or
consult your Caterpillar dealer.
Note: A qualified mechanic should adjust the engine
valve lash because special tools and training are
required.
Note: The engine crankcase breather on the
988G(S/N: BNH1-Up) is located inside the valve
cover. This breather does not require a maintenance
interval. Caterpillar recommends replacing the
crankcase breather during an engine overhaul. In
order to replace the breather element, the valve
cover will need to be replaced.
NOTICE
Attempts to clean the engine crankcase breather on
the 988G(S/N: BNH1-Up) may cause damage to the
element.
Illustration 208
g00882731
Start the engine and run the engine at low idle. Watch
the top surface of each valve rotator. Whenever an
inlet valve closes or an exhaust valve closes, each
valve rotator should turn.
If a valve rotator fails to turn, consult your Caterpillar
dealer for service.
i01394313
Engine Water Pump - Inspect

i01935374
Engine Valve Rotators - Inspect

SMCS Code: 1109-040
When inspecting the valve rotators, protective

glasses or face shield and protective clothing
must be worn, to prevent being burned by hot oil
or spray.
Caterpillar recommends replacing valve rotators that
are operating improperly. An improperly operating
valve rotator will shorten valve life because of
accelerated wear on the valves. Also, metal particles
from a damaged valve rotator could fall into the
cylinder and damage to the piston head and to the
cylinder head may result.
SMCS Code: 1361-040

Failure of the engine water pump may cause severe
engine overheating problems such as cracks in the
cylinder head or piston seizure.
Visually inspect the water pump for leaks. If you find
leaks, all of the seals on the water pump must be
replaced.
Note: For more information, refer to the appropriate
Disassembly and Assembly manual for your
machines engine.
SEBU7198-07
121
Maintenance Section
Ether Starting Aid Cylinder - Replace
i01548876
Ether Starting Aid Cylinder Replace

(If Equipped)
SMCS Code: 1456-510-CD
3. Remove the used gasket. Install the new gasket

that is provided with every new ether starting aid
cylinder.
4. Install new ether starting aid cylinder. Tighten the
ether starting aid cylinder hand tight. Tighten the
cylinder retaining clamp securely.
i01624411
Ether is poisonous and flammable.

Breathing ether vapors or repeated contact of
ether with skin can cause personal injury.
Fuel System - Prime

SMCS Code: 1250-548
Use ether only in well ventilated areas.

Do not smoke while changing ether cylinders.
Use ether with care to avoid fires.
Do not store replacement ether cylinders in living
areas or in the operators compartment.
Do not store ether cylinders in direct sunlight or
at temperatures above 49 C (120 F).
Discard cylinders in a safe place. Do not puncture
or burn cylinders.
Illustration 210
g00549858
Illustration 211
g00502068
Keep ether cylinders out of the reach of unauthorized personnel.

To avoid possible injury, be sure the brakes are applied and all controls are in Hold or Neutral when
starting the engine.

the machine. The priming pump is mounted on
the top of the primary fuel filter.
Illustration 209
g00805191

the machine.
2. Loosen cylinder retaining clamp (1). Remove
empty ether starting aid cylinder (2) and discard
the empty ether starting aid cylinder.
2. Turn the priming pump plunger counterclockwise

and pull out the priming pump plunger.
3. Operate the fuel priming pump in order to fill the
new filter element. Continue to operate the fuel
priming pump until the pump resists operation.
This indicates that the filter element is full of fuel.
122
Maintenance Section
Fuel System Primary Filter (Water Separator) - Check/Drain
4. Push the priming pump plunger downward and

turn the priming pump plunger clockwise in order
to lock the priming pump plunger.
5. Start the engine. Look for leaks around the fuel
filter element. If the engine will not start or the
engine misfires, more priming is necessary.
6. If the engine runs rough after start-up, stop the
engine. Perform the following procedure:
SEBU7198-07
i01549331
Fuel System Primary

Filter (Water Separator) Check/Drain
SMCS Code: 1263-535; 1263-543
NOTICE
products.
mandates.
Illustration 212
g00840716
The vent plug is located on the right side of the machine.
a. Loosen the vent plug on the fuel return

manifold.
b. Release the priming pump plunger and prime
the fuel system until a continuous stream of
fuel is flowing from the opening. Catch the fuel
in a suitable container.
Illustration 213
g00805407
c. Install the vent plug in the fuel return manifold

and lock the priming pump plunger.

the machine. The water separator is located on
the bottom of the primary fuel filter.
d. Start the engine. Continue to operate the

engine at low idle until the engine operates
smoothly.
2. Open the drain valve on the bottom of the water

separator bowl. Allow the water and the fuel to
drain into a suitable container.
3. Tighten the drain valve.

Note: The water separator is under suction during
normal engine operation. The drain valve must be
tightened in order to prevent air leakage into the fuel
system.
SEBU7198-07
123
Maintenance Section
Fuel System Primary Filter (Water Separator) Element - Replace
i02281860
Fuel System Primary Filter

(Water Separator) Element Replace
SMCS Code: 1260-510; 1263-510-FQ
4. Remove the water separator bowl from the filter

element. Clean the water separator bowl and the
O-ring groove.
Note: The water separator bowl is reusable. Do not
discard the water separator bowl.
5. Inspect the O-ring seal in the water separator bowl
for damage. Replace the O-ring seal, if necessary.
NOTICE
6. Lubricate the O-ring seal with clean diesel fuel or

with engine oil. Place the O-ring seal in the water
separator bowl.
7. Install the water separator bowl onto the new filter
element by hand. Do not use tools to tighten the
water separator bowl.

products.
mandates.
NOTICE
Do not fill fuel filters with fuel before installing them.
The fuel will not be filtered and could be contaminated.
Contaminated fuel will cause accelerated wear to fuel
system parts. The fuel system should be primed prior
to starting the engine.
Illustration 215
g00101318
8. Apply a thin coat of oil to the seal on the new filter.

Install the new fuel filter hand tight until the seal
of the engine oil filter contacts the base. Note the
position of the index marks on the filter in relation
to a fixed point on the filter base.
Note: There are rotation index marks on the fuel filter
that are spaced 90 degrees or 1/4 or a turn away
from each other. When you tighten the fuel filter, use
Illustration 214
g00805407


the machine. The water separator is located on
the bottom of the primary fuel filter.
10. Tighten the drain valve on the water separator

bowl.
2. Open the drain valve on the water separator bowl.

Allow the water and the fuel to drain into a suitable
container.
Note: The water separator element is under suction

during normal engine operation. The drain valve must
be tightened in order to prevent air leakage into the
fuel system.
3. Use a strap type wrench to remove the filter from

the filter mounting base.
11. Prime the fuel system in order to fill the filter

element with fuel.
124
Maintenance Section
Fuel System Secondary Filter - Replace
SEBU7198-07

Manual, Fuel System Prime for the correct
procedure.
i02281881
Fuel System Secondary Filter Replace

SMCS Code: 1261-510-SE
NOTICE
products.
mandates.
Illustration 217
g00802224
2. Remove the used filter element. Dispose of the

used filter element properly.
3. Clean the filter mounting base. Make sure that all
of the used seal is removed.
NOTICE
Do not fill fuel filters with fuel before installing them.
The fuel will not be filtered and could be contaminated.
Contaminated fuel will cause accelerated wear to fuel
system parts. The fuel system should be primed prior
to starting the engine.
Illustration 218
g00101318
4. Apply a thin coat of clean diesel fuel to the seal on

the new fuel filter. Install the new fuel filter hand
tight until the seal of the fuel filter contacts the
base. Note the position of the index marks on the
filter in relation to a fixed point on the filter base.
Illustration 216
g00550189

the machine.
Note: There are rotation index marks on the fuel filter

that are spaced 90 degrees or 1/4 of a turn away
from each other. When you tighten the fuel filter, use
SEBU7198-07
125
Maintenance Section
Fuel Tank Cap and Strainer - Clean

2. Inspect seal (4) for damage. Replace the seal, if

necessary.
3. Remove screws (1), filter assembly (2), drain
valve (3) and the gaskets.
6. Prime the fuel system.

Manual, Fuel System - Prime for the correct
procedure.
i01822422
Fuel Tank Cap and Strainer Clean

g00930457
SMCS Code: 1273-070-STR; 1273-070-Z2
Illustration 221
The fuel tank cap is located on the left side of the

machine.
Note: Refer to Operation and Maintenance Manual,

General Hazard Information for information on
Containing Fluid Spillage.
4. Remove the strainer from the filler tube.
5. Wash the fuel tank cap and the strainer in a clean,
nonflammable solvent.
6. Install a new cap filter kit. Install the other
components in reverse order.
7. Install the strainer and the fuel tank cap.
i02156799
Illustration 219
g00930455
7x-7700 Fuel Tank Cap (Vented)
Fuel Tank Water and Sediment

- Drain
SMCS Code: 1273-543-M&S
NOTICE
Illustration 220
g00930484
Use 101-8909 Fuel Tank Cap (non-vented) if your machine is

equipped with a fast fill fuel adapter.
1. Lift the lever and turn the lever counterclockwise

until the lever stops. Remove the fuel tank cap.

products.
mandates.
126
Maintenance Section
Fuses - Replace
Illustration 222
SEBU7198-07
g01093885
The fuel tank drain valve is located on the left side of

the machine at the bottom of the fuel tank.
Illustration 223
g01093886
Open the fuel tank drain valve. Allow the water and
sediment to drain into a suitable container. Close the
fuel tank drain valve.
i01061054
Fuses - Replace
Illustration 224
g00503503
The fuses are located under a small access door on

the right cab platform.
Illustration 225
g00502446
Transmission Electronic Control (1) 10

amp
Implement Electronic Control (2) 10
amp
SMCS Code: 1417-510
Blower Fan (3) 20 amp
Fuses The fuses protect the electrical

system from damage that is caused by
overloaded circuits. Replace a fuse if the
element separates. If the element of a new fuse
separates, inspect the circuit. Repair the circuit, if
necessary.
Horn (4) 10 amp
Front Floodlights (5) 15 amp
Rotating Beacon (6) (if equipped) 10

amp
SEBU7198-07
127
Maintenance Section
Hydraulic System Oil - Change
Oil Filters
Lighter (7) 10 amp
Caterpillar oil filters are recommended. The interval

for changing the oil filter should be 500 hours.
Oil
Seat (8) 15 amp
The 4000 hour interval for changing the oil is for the
following oil types.
Payload Control System (9) 10 amp
Caterpillar Hydraulic Oil (HYDO)

CaterpillarTransmission/Drive Train Oil (TDTO)
Rear Floodlights (10) 15 amp
Caterpillar TDTO (TMS)

Caterpillar Diesel Engine Oil
Electronic Gauges (11) 10 amp
Caterpillar Biodegradable Hydraulic Oil (HEES)

Caterpillar Multipurpose Tractor Oil (MTO)
Voltage Converter (12) 10 amp
Heavy-Duty Diesel Engine Oil with a minimum

zinc content of 900 parts per million (ppm)
Heavy-duty oils are identified by the following

classifications: Cat ECF-1, API CF, API CG-4, and
TO-4. Cat ECF-1, API CF, API CG-4, and TO-4 oils
must have a minimum zinc additive of 900 parts per
million (ppm) in order to be considered acceptable for
use in a hydraulic system.
Window Wipers (13) 10 amp
Note: Industrial hydraulic oils are not recommended

in Caterpillar hydraulic systems. These oils are more
likely to cause corrosion and excessive wear.
Open (14) 10 amp
Stairway Access Light (15) 10 amp
Monitoring the Condition of the Oil

The oil should be monitored during intervals of 500
hours. Caterpillars standard SOS Fluids Analysis or
an equivalent oil sampling program should be used.
The current guidelines for cleanliness of the oil
should be observed. Refer to Measured Data.
i02301275
If an oil sampling program is not available, the

standard 2000 oil change interval should be used.
SMCS Code: 5056-044
Measured Data
The following information should be monitored when

you sample the oil:
Your machine may be able to use a 4000 hour

interval for the hydraulic oil. The hydraulic oil is in
the system that is not integral to the service brakes,
the clutches, the final drives, or the differentials.
The standard change interval is 2000 hours. The oil
should be monitored in additional increments of 500
hours. The extended 4000 hour interval can be used
if the following criteria are met.
Significant changes in wear metals should be
monitored. These metals include iron, copper,

chromium, lead, aluminum, and tin.
The following additives should be observed for

significant changes: Zinc, calcium, magnesium,
and phosphorus.
128
Maintenance Section
SEBU7198-07
Contaminants should not be present. These
contaminants include fuel and antifreeze. Water

content should be .5 percent or less.
The silicon level should not exceed 15 parts per

million for new oil. The particle counts should be
monitored.
The recommended level of cleanliness for
Caterpillar machines that are operated in the field

is ISO 18/15 or cleaner. The cleanliness should
be monitored by particle count analysis. The
levels of contamination should not exceed normal
levels by more than two ISO codes. Action should
be taken in order to determine the cause of the
contamination. The system should be returned to
the original levels of contamination.
There should not be significant changes in sodium,

silicon, copper, and potassium.
The allowable level of oxidation is 40 percent (0.12

Abs units).
Illustration 226
g01152499
The kinematic viscosity at 100 C (212 F) should
3. The hydraulic tank is located on the right side of

the machine. Press the button on the breaker relief
valve (1) in order to relieve any tank pressure.
Procedure for Changing the

Hydraulic Oil
4. Remove the hydraulic tank filler cap (2). Remove

the filler strainer from the hydraulic tank filler neck.
Wash the filler cap and the strainer in a clean,
nonflammable solvent. Install the strainer.
not exceed a 2 cSt change.
NOTICE
products.
mandates.
1. Operate the machine in order to warm the
hydraulic oil.
2. Park the machine on level ground. Lower the
attachment to the ground and apply slight
downward pressure. Engage the parking brake
and stop the engine.
5. Inspect the gasket on the hydraulic tank filler cap

for damage. Replace the gasket, if necessary.
6. Remove the drain plug from the bottom of the
hydraulic tank. Wash the drain plug in a clean,
nonflammable solvent.
7. Install a 6B-3156 Pipe Nipple into the drain
valve in order to unseat the drain valve. Allow the
hydraulic oil to drain into a suitable container.
NOTICE
Never start the engine while the hydraulic oil tank is
being drained or while the hydraulic oil tank is empty.
Excessive wear and damage to the hydraulic components can occur.
8. Remove the pipe nipple in order to close the drain
valve. Install the hydraulic tank drain plug.
9. Change the hydraulic oil filter.
Manual, Hydraulic System Oil Filter - Replace for
the correct procedure.
10. Fill the hydraulic tank with clean oil. Make sure
that the oil level is at the FULL mark on sight
gauge (4).
SEBU7198-07
129
Maintenance Section
Hydraulic System Oil Filter - Replace

Manual, Lubricant Viscosities and Refill
Capacities for the correct type of oil and for the
correct amount of oil.
11. Install filler cap (2).
Note: The steering pump and the implement pump
must be primed before the engine is started. This
is necessary in order to ensure proper operation of
the pumps.
Filling the Cases of the Implement Pump

and the Steering Pump
The cases of the steering pump and the implement
pump must be filled with oil before the engine is
started. This is necessary in order to ensure proper
operation of the pumps.
1. Open the access doors that are located behind
the operator compartment.
4. Remove the cap from port (9). Attach a drain hose

that is equipped with a quick-connect fitting to tee
(7). Place the end of the drain hose into a suitable
container in order to collect excess hydraulic oil.
Pour clean hydraulic oil into port (9). Continue to
pour hydraulic oil until the hydraulic oil comes out
of the drain hose that is attached to tee (7).
5. Remove the drain hose and install the cap onto
port (9). The case for the implement pump is now
filled.
6. Replace any hydraulic oil that was lost during the
installation of the hoses.
Manual, Hydraulic System Oil Level - Check for
more information.
Note: The oil must be free of bubbles. If bubbles are
present in the oil, air is entering the hydraulic system.
Inspect the suction hoses and the hose clamps.
i02281903
Hydraulic System Oil Filter Replace

SMCS Code: 5068-510
NOTICE
products.
Illustration 227
g00935858
2. Remove the cap from port (6). Attach a drain hose

that is equipped with a quick-connect fitting to tee
(8). Place the end of the drain hose into a suitable
container in order to collect excess hydraulic oil.
Pour clean hydraulic oil into port (6). Continue to
pour hydraulic oil until the hydraulic oil comes out
of the drain hose that is attached to tee (8).
3. Remove the drain hose and install the cap onto
port (6). The steering pump case is now filled.

mandates.
130
Maintenance Section
Hydraulic System Oil Level - Check
Illustration 228
SEBU7198-07
g01001201
The hydraulic oil filter is located behind the mud flap

on the front of the hydraulic tank.
Note: The mud flap may be removed for easier
access to the filter.
1. Stop the engine.
Illustration 230
g00101318
6. Apply a thin coat of hydraulic oil to the seal on

the new filter. Install the new hydraulic oil filter
hand tight until the seal of the hydraulic oil filter
contacts the filter base. Note the position of the
index marks on the filter in relation to a fixed point
on the filter base.
Note: There are rotation index marks on the hydraulic
away from each other. When you tighten the hydraulic
Illustration 229
g01001186
2. Use a strap type wrench to remove the hydraulic

oil filter element. Dispose of the used filter
properly.
3. Remove the filler cap and the strainer from the
hydraulic oil filler tube. Wash the filler cap and the
strainer in a clean nonflammable solvent. Allow
the strainer to air dry.
4. Inspect the strainer for damage. Replace the
strainer, if necessary. Install the strainer and the
filler cap.
5. Clean the filter mounting base. Make sure that
all of the used gasket is removed from the filter
mounting base.

Inspect the hydraulic system for leaks.
9. Check the level of the hydraulic oil.
Manual, Hydraulic System Oil Level - Check for
the correct procedure.
i01832234
Hydraulic System Oil Level Check

Note: The work tool must be positioned on the
ground in order to have an accurate reading.
SEBU7198-07
131
Maintenance Section
Hydraulic System Oil Sample - Obtain
i02156928
Hydraulic System Oil Sample

- Obtain
SMCS Code: 5050-008; 5056-008; 7542
Illustration 231
g00838902
The hydraulic tank is located on the right side of the

machine.
Illustration 233
g01093962
Obtain a sample of the hydraulic oil from the

hydraulic oil sampling valve. The sampling valve is
located on the hydraulic oil filter base on the front
of the hydraulic tank. Refer to Special Publication,
SEBU6250, SOS Oil Analysis for information
that pertains to obtaining a sample of hydraulic oil.
Refer to Special Publication, PEHP6001, How To
Take A Good Oil Sample for more information about
obtaining a sample of hydraulic oil.
Illustration 232
g00935879
1. Maintain the hydraulic oil level within the

designated range (3).
2. If necessary, press hydraulic tank breaker relief
valve (1) in order to relieve any tank pressure.
Then, remove hydraulic tank filler cap (2) and add
hydraulic oil.
i01923846
Hydraulic Tank Breaker Relief

Valve - Clean
SMCS Code: 5118-070
3. If hydraulic oil was added, clean the hydraulic tank

filler cap and install the hydraulic tank filler cap.
Illustration 234
g01001206
The hydraulic tank breaker relief valve is located on

the side of the hydraulic tank.
132
Maintenance Section
Lift Cylinder Pin Oil - Change
SEBU7198-07
1. To relieve the pressure in the hydraulic tank, press

the button on the top of the hydraulic breaker.
Remove the hydraulic tank breaker relief valve.
2. Clean the hydraulic tank breaker relief valve in
a clean, nonflammable solvent. Shake the relief
valve dry or use pressure air.
3. Install the hydraulic tank breaker relief valve.
i02157156
Lift Cylinder Pin Oil - Change

SMCS Code: 7070-044-OC
Illustration 236
NOTICE
products.
g01094056
Pin Joint (K)
2. Remove the drain plug for pin joint (K). The drain
plug is located on the right side of the machine.
Allow the oil to drain into a suitable container.
3. Remove the filler plug for pin joint (K). The filler
plug is located on the right side of the machine.
4. After the oil has drained, clean the drain plug and
install the drain plug.

mandates.
Illustration 237
g01094058
Pin Joint (K)
Illustration 235
g00560502
1. Park the machine on level ground and engage

the parking brake. Lower the bucket so that the
bottom of the bucket is flat on the ground. Stop
the engine.
5. Fill the pin joint with SAE 80W90 oil until oil
escapes from the filler opening.
6. Clean the filler plug and install the filler plug.
SEBU7198-07
Illustration 238
133
Maintenance Section
Lift Cylinder Pin Oil Level - Check
g01094059
Illustration 241
g01094065
Pin Joint (Y)
8. Remove the filler plug for pin joint (Y). The filler
plug is located on the inside of the left front loader
frame.
9. After the oil has drained, clean the drain plug and
install the drain plug.
10. Fill the pin joint with SAE 80W90 oil until oil
escapes from the filler opening.
Note: It will be necessary to use a funnel and a hose
to fill the pin joint through the filler opening.
Illustration 239
g01094061
Pin Joint (Y)
7. Remove the drain plug for pin joint (Y). The

drain plug is located on the inside of the left front
loader frame. Allow the oil to drain into a suitable
container.
i02157325
Lift Cylinder Pin Oil Level Check

Illustration 240
g01094064
Illustration 242
g00560502

bottom of the bucket is flat on the ground.
134
Maintenance Section
Loader Boom Pin Oil - Change
SEBU7198-07
5. Repeat the procedure for pin joint (Y).

i02280356
Loader Boom Pin Oil - Change

SMCS Code: 6118-044-OC
Illustration 243
g01094058
Pin Joint (K)
NOTICE
2. Clean the area around the filler plug for pin joint
(K). Slowly loosen the filler plug.

products.
3. If the oil escapes from the filler opening, the oil

level in the pin joint is correct. If the oil level is
low, add SAE 80W90 until oil escapes from the
filler opening.

mandates.
Illustration 244

bottom of the bucket is flat on the ground. Stop
the engine.
g01094064
Illustration 246
The A-pin joints (1) do not have drain plugs.
Illustration 245
Pin Joint (Y)
g01094065
g00811718
SEBU7198-07
135
Maintenance Section
Loader Boom Pin Oil Level - Check
i02157449
Loader Boom Pin Oil Level Check

Illustration 247
g01094359
A-Pin Joint
2. Remove the filler plugs for both A-pin joints.

3. Attach a piece of tubing that is at least 610 mm
(2 ft) to a 1U-5718 vacuum pump. Mark the tubing
305 mm (12 inch) from the open end. Cut the open
end of the tube at a 45 degree angle in order to
allow the tube to be inserted into the joint properly.
4. Install a sampling bottle onto the vacuum pump
and insert 305 mm (12 inch) of the tubing through
the filler plug opening. Insert the correct amount
of tubing through the filler plug opening in order
to make sure that the end of the tubing is at the
bottom of the oil cavity. Use the mark on the tubing
from step 3 as a guide.
Illustration 248
g00560643

bottom of the bucket is flat on the ground.
5. Fill the sampling bottle and withdraw the tube from

the filler plug opening.
6. Drain the sampling bottle into a suitable container.
7. Until no oil remains in the A-pin joints, repeat the
following steps: 4, 5, and 6.
8. Fill each pin joint with 0.25 L (8 oz) of SAE 80w90
oil.
Illustration 249
g01094359
A-Pin Joint
9. Install the filler plugs for both A-pin joints.
2. Clean the area around the filler plugs for both

A-pin joints. Slowly loosen each filler plug.
10. Start the engine. Move the boom through a

minimum of four complete cycles. This will force
any trapped air to the top of the joint. Inspect the
joint for leaks. Check the oil level of the joint.
3. If the oil escapes from the filler opening, the oil

level is correct. If the oil level is low, add SAE
80W90 until oil escapes from the filler opening.

Manual, Loader Boom Pin Oil Level - Check for
more information.
Reference: Refer to Special Publication,
NEHP6013, SOS Fluid Analysis Products for
more information.
4. Clean the filler plugs and install the filler plugs.
136
Maintenance Section
Loader Boom Pin and Lift Cylinder Pin - Inspect
SEBU7198-07
i01613549
Loader Boom Pin and Lift

Cylinder Pin - Inspect
SMCS Code: 5102-040-PN; 6501-040-PN
Illustration 252
g01094968
B-Pin Joint
For the B-pin joint, apply lubricant through the fitting

on the top of the boom.
Illustration 250
g00818239
Inspect the Loader Boom Pin (A) for signs of leakage.

If signs of leakage are found, check the oil level in
the pin joint. Refer to Operation and Maintenance
Manual, Loader Boom Pin Oil Level - Check for the
correct procedure.
Inspect Lift Cylinder Pins (Y) and (K) for signs of
leakage. If signs of leakage are found, refer to
Operation and Maintenance Manual, Lift Cylinder
Pin Oil Level - Check for information on checking
the oil level of the pins.
Illustration 253
i02158811
Loader Pins and Bearings Lubricate
g01094969
C-Pin Joints
For the C-pin joints, apply lubricant through the

fittings at the bottom of each bucket link.
SMCS Code: 5104-086; 6117-086; 7070-086
Illustration 254
Illustration 251
g00560806

There is a total of nine fittings.
g01094970
E-Pin Joints
For the E-pin joints, apply lubricant through three

remote fittings on the bucket links.
SEBU7198-07
137
Maintenance Section
Oil Filter - Inspect
i02106227
Oil Filter - Inspect

SMCS Code: 1308-507; 3004-507; 3067-507;
5068-507
S/N: BNH1-Up
Inspect a Used Filter for Debris
Illustration 255
g01094972
F-Pin Joint (Right Side)
Illustration 258
g00100013
The element is shown with debris.
Illustration 256
g01094974
F-Pin Joint (Left Side)
For the F-pin joints, apply lubricant through the

fittings at the bottom of each tilt lever.
Use a filter cutter to cut the filter element open.

Spread apart the pleats and inspect the element for
metal and for other debris. An excessive amount of
debris in the filter element can indicate a possible
failure.
If metals are found in the filter element, a magnet can
be used to differentiate between ferrous metals and
nonferrous metals.
Ferrous metals can indicate wear on steel parts and
on cast iron parts.
Nonferrous metals can indicate wear on the
aluminum parts of the engine such as main bearings,
rod bearings, or turbocharger bearings.
Small amounts of debris may be found in the filter
element. This could be caused by friction and by
normal wear. Consult your Caterpillar dealer in order
to arrange for further analysis if an excessive amount
of debris is found.
Illustration 257
g01094975
G-Pin Joint
For the G-pin joint, apply lubricant through one

remote fitting on the inside of the right front loader
frame.
Using an oil filter element that is not recommended

by Caterpillar can result in severe engine damage
to engine bearings, to the crankshaft, and to other
parts. This can result in larger particles in unfiltered
oil. The particles could enter the lubricating system
and the particles could cause damage.
138
Maintenance Section
Radiator Core - Clean
SEBU7198-07
i02158840
i02252730
Radiator Core - Clean
Refrigerant Dryer - Replace
SMCS Code: 1353-070-KO
SMCS Code: 7322-510
Personal injury can result from contact with refrigerant.

Contact with refrigerant can cause frost bite. Keep
face and hands away to help prevent injury.
Protective goggles must always be worn when refrigerant lines are opened, even if the gauges indicate the system is empty of refrigerant.
Illustration 259
g01094991
On each side of the machine, the radiator core can

be accessed through the vents and through the
narrow access doors.
Always use precaution when a fitting is removed.

Slowly loosen the fitting. If the system is still under pressure, release it slowly in a well ventilated
area.
Personal injury or death can result from inhaling
refrigerant through a lit cigarette.
Inhaling air conditioner refrigerant gas through a
lit cigarette or other smoking method or inhaling
fumes released from a flame contacting air conditioner refrigerant gas, can cause bodily harm or
death.
Do not smoke when servicing air conditioners or
wherever refrigerant gas may be present.
Use a certified recovery and recycling cart to properly remove the refrigerant from the air conditioning system.
Illustration 260
g00100062
You can use compressed air, high pressure water,

or steam to remove dust and other debris from the
radiator core. However, the use of compressed air
is preferred.
Refer to Special Publication, SEBD0518, Know
Your Cooling System for the complete procedure for
cleaning the radiator core.
NOTICE
If the refrigerant system has been open to the outside
air (without being plugged) for more than 30 minutes,
the receiver-dryer must be replaced. Moisture will enter an open refrigerant system and cause corrosion
which will lead to component failure.
Refer to Service Manual, SENR5664, Air
Conditioning and Heating System with R-134a
Refrigerant for All Caterpillar Machines for the proper
procedure to change the receiver-dryer assembly
and for the procedure to reclaim the refrigerant gas.
SEBU7198-07
139
Maintenance Section
Rollover Protective Structure (ROPS) - Inspect
i02159129
Rollover Protective Structure

(ROPS) - Inspect
SMCS Code: 7325-040
Illustration 262
g00932801
Typical example
Illustration 261
g01095101
Inspect the ROPS for bolts that are loose or damaged.

Use original equipment parts only to replace bolts
that are damaged or missing. Tighten the four cab
mounting bolts to a torque of 1500 200 Nm
(1106 147.5 lb ft).
Note: Apply oil to all bolt threads before installation.
Failure to apply oil can result in improper bolt torque.
Do not repair the ROPS by welding reinforcement
plates to the ROPS. Consult your Caterpillar dealer
for repair of cracks in any welds, in any castings, or
in any metal section of the ROPS.
i02301796
Seat Belt - Inspect

SMCS Code: 7327-040
Always check the condition of the seat belt and the
condition of the seat belt mounting hardware before
you operate the machine. Replace any parts that are
damaged or worn before you operate the machine.
Check the seat belt mounting hardware (1) for wear

or for damage. Replace any mounting hardware that
is worn or damaged. Make sure that the mounting
bolts are tight.
Check buckle (2) for wear or for damage. If the buckle
is worn or damaged, replace the seat belt.
Inspect the seat belt (3) for webbing that is worn or
frayed. Replace the seat belt if the seat belt is worn
or frayed.
Contact your Caterpillar dealer for the replacement of
the seat belt and the mounting hardware.
Note: Within three years of the date of installation or
within five years of the date of manufacture, replace
the seat belt. Replace the seat belt at the date which
occurs first. A date label for determining the age of
the seat belt is attached to the seat belt, the seat belt
buckle, and the seat belt retractor.
If your machine is equipped with a seat belt
extension, also perform this inspection procedure for
the seat belt extension.
i02303477
Seat Belt - Replace

SMCS Code: 7327-510
Within three years of the date of installation or within
five years of the date of manufacture, replace the
seat belt . Replace the seat belt at the date which
occurs first. A date label for determining the age of
the seat belt is attached to each seat belt.
140
Maintenance Section
Seat Side Rails - Adjust
SEBU7198-07
i01061080
Starting Motor - Inspect

SMCS Code: 1453-040
Caterpillar recommends a scheduled inspection of
the starting system.
Check the starting motor and the battery charger
for proper operation. Check for loose electrical
connections.
Illustration 263
(1) Date
(2) Date
(3) Date
(4) Date
g01152685
of installation (retractor)
of installation (buckle)
of manufacture (tag) (fully extended web)
of manufacture (underside) (buckle)
Contact your Caterpillar dealer for the replacement

of the seat belt.
If your machine is equipped with a seat belt
extension, also perform this replacement procedure
for the seat belt extension.
Reference: For the complete procedure for

inspecting the starting system, refer to the Systems
Operation/Testing and Adjusting manual for your
machines engine.
i02168764
Steering Cylinder Bearings Lubricate

SMCS Code: 4303-086-BD
i01547608
There is a total of four fittings.
Seat Side Rails - Adjust

SMCS Code: 7312-025
Illustration 265
Illustration 264
g00804394
Caterpillar recommends adjusting the side rails after

the initial 500 hours of machine operation. After the
initial 500 service hours, perform this procedure
when it is necessary.
Reference: Refer to Service Manual, SENR6615,
Contour Series Seat for the adjustment procedure.
g01098863
Apply lubricant through the fitting on the head end

of each steering cylinder.
SEBU7198-07
141
Maintenance Section
Tire Inflation - Check
i02160651
Transmission Oil - Change

SMCS Code: 3030-044
NOTICE
Illustration 266
g01098864
The bearing on the rod end of each steering cylinder

is lubricated through two remote fittings on the inside
of the right front loader frame.
Apply lubricant through fitting (1) for the right steering
cylinder. Apply lubricant through fitting (2) for the left
steering cylinder.
i02305841
Tire Inflation - Check

SMCS Code: 4203-535-AI
Illustration 267
g01160201

products.
mandates.
1. Operate the machine in order to warm the
transmission oil.
2. Park the machine on level ground. Lower the
bucket to the ground and apply slight downward
pressure. Engage the parking brake. Stop the
engine.
Illustration 268
g01095645
Always obtain proper tire inflation pressures and

maintenance recommendations for the tires on your
machine from your tire supplier. Measure the tire
pressure on each tire.
3. Earlier machines will need to remove the

transmission guard from the bottom of the
machine in order to access the drain plug. Later
machines have an access hole in the transmission
guard for the transmission drain plug.
Inflate the tires with nitrogen , if necessary.
Note: The drain valve is an ecology drain valve.
Reference: Refer to the Tire Inflation Information

section of the Operation and Maintenance Manual
for more information.
4. Remove the transmission drain plug from the

bottom of the transfer gear case. Attach a hose
to a 126-7914 Oil Drain Coupling. Install the
threaded end of the coupling into the drain valve
in order to unseat the internal drain valve. Allow
the oil to drain into a suitable container.
142
Maintenance Section
Transmission Oil - Change
Illustration 269
SEBU7198-07
g01095647
5. The transmission oil filler tube is located near the

articulation joint on the left side of the machine.
Remove the transmission oil filler cap in order to
ease drainage.
Illustration 271
g00838905
a. Remove bolts (1) and washers (2). Remove

cover assembly (3) and seal (5).
b. Remove screen tube assembly (6) and suction
screen (7).
c. Wash the screen tube assembly and the
suction screen in a clean, nonflammable
solvent.
d. Install screen tube assembly (6) and suction
screen (7).
e. Inspect seal (5) for damage. Replace the
seal, if necessary. Install seal (5) and cover
assembly (3).
7. Replace the transmission oil filter.
Illustration 270
g01095648
6. The transmission magnetic screen is located on

the left side of the transfer gear case. The screen
may be accessed through the left side of the rear
frame, as shown.
Use the following procedure to clean the
transmission magnetic screen:
NOTICE
Do not drop or rap the magnets against any hard objects. Replace any damaged magnets.

Manual, Transmission Oil Filter - Replace for the
correct procedure.
8. Clean the transmission drain plug. Install the
transmission drain plug.
9. Fill the transmission with oil.
of oil.
10. Clean the filler cap and install the filler cap.
SEBU7198-07
143
Maintenance Section
Transmission Oil Filter - Replace
i02161140
Transmission Oil Filter Replace

SMCS Code: 3067-510
NOTICE
Illustration 272
g00935383
Transmission Breather
11. Open the access door in the platform behind the

cab. Remove the transmission breather.
12. Wash the breather in a clean, nonflammable
solvent. Allow the breather to air dry or use air
pressure to dry the breather. Install the breather.

products.
mandates.
14. Slowly operate the transmission control in order
to circulate the oil. Return the transmission to
neutral.
15. Stop the engine. Inspect the entire transmission
for leaks.
Illustration 274
g00935569
The transmission oil filter is located on the left side of

the machine near the articulation joint.
Note: The hose for the steering cylinder may obstruct
the bottom of the filter.
1. Stop the engine and remove the key.
Illustration 273
g00935572
16. Check the transmission oil level.

Manual, Transmission Oil Level - Check for the
correct procedure.
2. Turn the battery disconnect switch to the OFF

position.
144
Maintenance Section
Transmission Oil Filter - Replace
Illustration 275
SEBU7198-07
g01095645
3. Earlier machines will need to remove the

transmission guard from the bottom of the
machine in order to access the drain plug. Later
machines have an access hole in the transmission
guard for the transmission drain plug.
Note: The drain valve is an ecology drain valve.
4. Remove the transmission drain plug from the
bottom of the transfer gear case. Attach a hose
to a 126-7914 Oil Drain Coupling. Install the
threaded end of the coupling into the drain valve
in order to unseat the internal drain valve. Allow
the oil to drain into a suitable container.
Illustration 277
g00930161
6. Remove bolts (2) and cover plate (1) from the

bottom of filter housing (4).
7. Remove filter element (3) from filter housing (4).
Dispose of the used filter element properly.
8. Clean the filter housing and the filter housing base
with a clean, nonflammable solvent.
9. Inspect the cover seal for the filter housing.
Replace the seal if the seal is damaged.
10. Clean the transmission drain plug. Install the
transmission drain plug.
11. Install a new filter element, the cover plate and
bolts on the bottom of the transmission oil filter
housing.
12. Fill the transmission with oil.
Illustration 276
g01095647
5. The transmission oil filler tube is located near the

articulation joint on the left side of the machine.
Remove the transmission oil filler cap in order to
ease drainage.

of oil.
13. Clean the filler cap and install the filler cap.
15. Slowly operate the transmission control in order
to circulate the transmission oil. Return the
transmission to neutral.
16. Stop the engine. Check the transmission oil filter
for leaks.
SEBU7198-07
Illustration 278
145
Maintenance Section
Transmission Oil Level - Check
g00935572
17. Check the transmission oil level.

Manual, Transmission Oil Level - Check for the
correct procedure.
i01833015
Transmission Oil Level - Check
Illustration 280
g00936406
2. Check the oil level in the sight gauge. Maintain

the oil level within the operating range while the
engine is running.
Note: The oil level varies significantly when the
engine is stopped. The oil level will be considerably
higher than the operating range. The oil level should
be above the middle of the gauge before the engine
is started.
3. If necessary, remove the filler cap and add oil.
Clean the filler cap and install the filler cap.
i02161205
Transmission Oil Sample Obtain

SMCS Code: 3080-008; 7542-008
Illustration 279
g00936405
The sight gauge is located on the left side of the machine near
the articulation joint.
1. Operate the machine for a few minutes in order to

warm the oil. Park the machine on level ground.
Illustration 281
g01095817
The sampling valve for the transmission oil is located

on the transmission oil filter base on the left side of
the machine.
146
Maintenance Section
Turbocharger - Inspect
SEBU7198-07
Refer to Special Publication, SEBU6250, Caterpillar

Machine Fluids Recommendations, SOS Oil
Analysis for information that pertains to obtaining
an oil sample from the transmission housing. Refer
to Special Publication, PEHP6001, How To Take
A Good Oil Sample for more information about
obtaining an oil sample from the transmission
housing.
i01394768
Turbocharger - Inspect
Inspect the precleaner bowl for dirt buildup. Clean

the precleaner bowl if dirt has accumulated to
the FULL mark. For more information, refer to
Operation and Maintenance Manual, Engine Air
Precleaner - Clean.
Inspect the tires for damage. Replace any missing

valve caps.
Inspect the axles, the differentials, the wheel
brakes and the transmission for leaks. Fix any

leaks.
Inspect the hydraulic system for leaks. Check the
SMCS Code: 1052-040

If the turbocharger fails during engine operation,
severe damage to the turbocharger compressor
wheel and to the entire engine can result.
hydraulic tank, all hoses and all tubes. Also, check

all plugs, all seals, all couplings and all fittings. Fix
any leaks and replace hoses, as needed.
Inspect all attachments and the linkages for wear

and for damage.
Turbocharger bearing failures can cause large

quantities of oil to enter the intake system and the
exhaust system. Loss of engine oil can result in
serious engine damage.
Make sure that all access doors, all access covers
Do not continue to operate the engine when a

turbocharger bearing failure is accompanied by
a significant loss of engine performance. Engine
smoke and speeding up of the engine with no load
are characteristics of a loss of engine performance.
Inspect the steps, the walkways and the handholds.
Reference: For more information about inspecting

the turbocharger, refer to the appropriate Service
Manual for your machines engine.
and all guards are secured. Inspect the access

doors, the access covers and the guards for
damage.
Remove any debris. Repair any damage or replace

any damaged parts.
If equipped, inspect the automated lubrication
system. Fix any leaks and replace any damaged

fittings or hoses.
Inspect the Rollover Protective Structure (ROPS)

i01832606
Walk-Around Inspection
SMCS Code: 7000-040
Note: Inspect the machine for leaks. If leaks are
observed, find the source of the leak and correct the
leak. If leaks are suspected, check the fluid levels
more frequently than the recommended intervals.
Inspect the cooling system for leaks and for
faulty hoses. Fix any leaks and replace hoses,

as needed. Remove any debris buildup from the
radiator. For more information, refer to Operation
and Maintenance Manual, Radiator Core - Clean.
Inspect the engine compartment. Remove any

debris buildup from the engine compartment.
Clean the engine access doors.
Inspect the engine for any obvious component

damage.
for obvious damage. Consult your Caterpillar

dealer for repairs.
Inspect the lights. Replace any broken bulbs and

any broken lenses.
Inspect the operator compartment. Remove any

trash buildup. Keep the operator compartment
clean.
Inspect the dash panel for broken gauges and for
broken indicator lights. Replace any broken parts.
Inspect the seat belt, the buckle and the mounting

hardware. Replace any components that are
worn or damaged. For more information, refer to
Operation and Maintenance Manual, Seat Belt Replace.
Adjust the mirrors for best visibility.

Inspect the windows. Make sure that the operators
vision is not impaired by dust, by mud, or by other
foreign materials. Clean the windows, if necessary.
For more information, refer to Operation and
Maintenance Manual, Windows - Clean.
SEBU7198-07
147
Maintenance Section
Window Washer Reservoir - Fill
i02161333
Window Washer Reservoir Fill
i00037755
Windows - Clean
SMCS Code: 7310-070
SMCS Code: 7306-544

NOTICE
When operating in freezing temperatures, use
Caterpillar nonfreezing window washer solvent or
equivalent. System damage can result from freezing.
Illustration 284
g00038949
Use commercially available window cleaning

solutions in order to clean the windows. Clean the
outside windows from the ground unless handholds
are available.
Illustration 282
g01095908
The window washer reservoir is located beneath an

access panel on the left cab platform .
Fill the reservoir with window washer solvent.
i02168843
Window Wiper Inspect/Replace

SMCS Code: 7305-040; 7305-510
Illustration 283
g01098903
Inspect the front wiper blade and the rear wiper

blade. Replace the wiper blades if the wiper blades
are worn or damaged or if streaking occurs.

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MAINTENANCE INTERVALS

Operation and Maintenance

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Maintenance Interval Schedule

Tire Inflation - Check ........................................... 141

Every 100 Service Hours or 2 Weeks

Initial 250 Service Hours

Before each consecutive interval is performed, all

Every 250 Service Hours

Every 250 Service Hours or Monthly

Automatic Lubrication Grease Tank - Fill .............. 88

Battery - Clean ...................................................... 91

Every 10 Service Hours or Daily

Differential and Final Drive Oil Sample - Obtain .. 106

Backup Alarm - Test .............................................. 90

Engine Oil Sample - Obtain ................................. 116

Initial 500 Service Hours

Initial 500 Hours (for New Systems, Refilled

Every 500 Service Hours

Every 500 Service Hours or 3 Months

Every 50 Service Hours or Weekly

Every 1000 Service Hours or 6 Months

Cab Air Filter - Clean/Replace .............................. 97

Articulation Bearings - Lubricate ........................... 88

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Rollover Protective Structure (ROPS) - Inspect .. 139

Every 2000 Service Hours or 1 Year

Every 3000 Service Hours or 2 Years

Every 3 Years After Date of Installation or

Every 4000 Service Hours or 2 Years

Every 4000 Service Hours or 2.5 Years

Every 5000 Service Hours or 3 Years

Every 6000 Service Hours or 3 Years

Every 6000 Service Hours or 6 Years

Every 12 000 Service Hours or 6 Years

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Apply grease through one fitting on the upper pivot

The alternator is located on the right side of the

Apply grease through one fitting on the lower pivot

Reference: For additional information, refer to the

Articulation Bearings Lubricate

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Automatic Lubrication Grease

The Centro-Matic Lubrication

Axle Oil Cooler Filter - Replace

4. Remove the pump and replace both plugs.

The Quicklub Lubrication System

Filling the Reservoir

2. Refill the reservoir when the grease reaches the

Priming the System

The filters are located under the access door on the

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2. Use a strap type wrench to remove the filters.

Axle Oscillation Bearings Lubricate

4. Apply a thin coat of clean differential oil to the

Note: There are rotation index marks on each oil

Apply lubricant through the two remote fittings on the

6. Start the engine and run the engine at low idle.