POWER CIRCUIT LOW CURRENT CIRCUIT

MAIN RELAY CIGAR

LIGHTER
WINDSHIELD
WIPER
BATTERY

NEG POS NEG POS

DISCONNECT ALTERNATOR
WINDSHIELD
SWITCH BREAKER LIGHTS WASHER

SWITCH PANEL
CAB HEATER
STARTER STARTER TIMER
MOTOR STARTER NEUTRAL SWITCH RELAY
RELAY START HORN
G S RELAY
MTR BAT AIR
CONDITIONER

MOTOR

STARTER
CONTROL NEUTRAL GOVERNOR
RELAY START SW. ACTUATOR
CONTROLLER

START/STOP CIRCUIT
CHARGING HEATER HEATER AIR
ALTERNATOR CIRCUIT CONTROL RELAY HEATER
UNIT
 308-YL-18 308-YL
200-BK-18

200-BK-18 308-YL 308-YL R

101-RD-6 C OFF
101-RD-6 S ON
B ST
10 A 1105-RD 105-RD
10 A 110-RD
15 A 175-RD-14
10 A 114-RD
10 A 115-RD
10 A 103-RD
101-RD-6
112-PU-6

10 A 184-RD 308-YL 4
10 A 149-RD 110-RD 1
3
15 A 130-RD-14 200BK 2 G
10 A
5A
30 A 168-RD-10

10 A 124-GN-14
5A 113-OR-18
10 A 118-GY
G S
10 A 152-BU
MTR BAT 5A 169-PK-18
101-RD-4 101-RD-6 109-RD-6 109-RD-6
60A
10 A 129-BU
MOTOR 10 A 160-PU
RD-00 RD-00 BK-00 5A 123-WH-18
B
POS NEG POS NEG L 10 A 120-YL
ALT P
R 10 A 179-BU
E
10 A 147-PU
 308-YL-18 308-YL
200-BK-18 200-BK
R
200-BK-18 308-YL 308-YL
C OFF
101-RD-6 S ON
101-RD-6 307-OR
B ST
105-RD
10 A 105-RD
110-RD
10 A
308-YL 4 1N
110-RD 1 +B
BK-18 C 189-RD 189-RD 3 OUT
RD-18 A 154-RD 200BK 2 GND
WH-18 B
101-RD-6

308-YL 6 KEY
189-GN 1 +B
200-BK 2 GND

1 306-GN
2 300-YL WH/BU S
403-GN-18 WH/YL P
200-BK-18 BK GND
304-WH-8 304-WH-8 109-RD-8
G S

403-GN-18
109-RD-6
MTR BAT
101-RD-4
101-RD-6 60A 109-RD-6
MOTOR
RD-00 RD-00 BK-00
B
POS NEG POS NEG L
ALT P
R
E

200-BK-6
 R
308-YL
C OFF
S ON
307-OR
B ST

BK-18
200BK-18 154-RD RD-18
WH-18
KEY SW. (ON) 308-YL-18
KEY SW. (START) 306-GN 31-GN
TEMPERATURE A718-PU-18
INDICATOR
RELAY 310-PU-18 A718-PU-18 1
REGULATOR 200-BK-18 200-BK-18 2
T°
CHECK TERM. 200-BK-18
GND 200-BK-18

G S

MTR BAT
101-RD-4 101-RD-4 877-YL-4 877-YL-4

MOTOR RD-00 RD-00 BK-00

POS NEG POS NEG
 112-PU-6
10 A
15 A
101-RD-6 5A
101-RD-6 10 A
10 A 10 A
10 A 5A
15 A 10 A
10 A 10 A

101-RD-6
10 A 5A
10 A 10 A
10 A 10 A
10 A 10 A
15 A 15 A
10 A 5A
5A 5A
G S 30 A 10 A
MTR BAT
101-RD-4 101-RD-6 109-RD-6 109-RD-6
60A

MOTOR
RD-00 RD-00 BK-00
B
POS NEG POS NEG L
ALT P
R
E

200-BK-6
 CONN. 79
495-GN 1 YL
235-BK 2 FUEL LEVEL SENSOR
BK
CHASSIS

492-GY COOLANT
ENGINE AND CHASSIS
235-BK T°
TEMPERATURE SENSOR

PUMP CONTROL 491-PK

HYDRAULIC OIL
CIRCUIT CHASSIS
235-BK T° TEMPERATURE SENSOR

CONN. 16
405-GY
ENGINE OIL
CHASSIS 235-BK PRESSURE SWITCH

CONN. 37
497-OR 2 RD SIGNAL HYDRAULIC OIL
235-BK 1 GROUND FILTER SWITCH
BK
CHASSIS
CONN. 85
430-BU AIR CLEANER
CHASSIS 235-BK SWITCH

CONN. 87 CONN. 5
HEATER
L975-PK 1 1 INDICATOR CONTROL LIMIT

CONN. 71
FUEL LEVEL 30 495-GN
COOLANT TEMP. SENSOR 29 492-GY 109-RD
491-PK CONN. 51 CONN. 54
BACKUP SW. 33
ALT. R TERM. 47 M736-BU M736-BU 8 M736-BU 9 M736-BU BACKUP SW. B
R
35 403-GN 235-BK 32 235-BK 12 235-BK P ALT ALTERNATOR
L
E

CONN. 72 200-BK
ENG. OIL PRESS. SW. 41 405-GY 403-GN
CUPSUL FILTER PLUGGED 42 497-OR CHASSIS
AIR CLEANER PLUGGED 46 430-BU
AIR HEATER CONTROLLER 4 L975-PK
CDL+ 33 883-GN
CDL- 43 892-BR BK-00 BK-00 RD-00 RD-00
KEY SW. DN. 23 308-YL NEG POS NEG POS
DISCONNECT G S
SWITCH
CHASSIS MTR BAT
BATTERY
MONITOR CONN. 7 CONN. 8
CONN. 1 CONN. 83
LIGHT 7 807-PK 7 MOTOR
ACC 3 189-PK 3 169-PK 13 189-PK 9 169-PK 5A 112-PU 101-RD
+B 1 103-RD 1 103-RD 8 FUSE (BACKUP MAIN RELAY
4 4 CONN. 1
CONN. 51 MONITOR CONTROL)
8 8 11 101-RD
CDL+ 5 893-GN 5 893-GN 10 893-GN 41
CDL- 6 832-BR 6 832-BR 9 892-BR 40 103-RD 10 A 101-RD 101-RD
GND 2 201-BK 2 201-BK FUSE (DOME TERMINAL
LAMP/MEMORY) BLOCK

START SW. 103-RD 10 A 101-RD 60A 109-RD

CONN. 42 CONN. 53 FUSE (KEY SW.) ALT. BREAKER
R CONN. 82
308-YL 10 308-YL
105-RD 4 105-RD 7
OFF C
ON S
ST B
 AUTOMATIC ENGINE SPEED CONTROL CIRCUIT (AEC)

SWITCH PANEL ENGINE GOVERNOR

SPEED SENSOR LEVER

MONITOR
ENGINE

ECU

GOVERNOR FEEDBACK
ACTUATOR SENSOR
 ONE-TOUCH
LOW IDLE CONTROL CIRCUIT

LOW IDLE
SWITCH
ENGINE

ENGINE
SPEED
DIAL
ECU GOVERNOR
IMPLEMENT/ SWING LEVER
PRESSURE
SWITCH

TRAVEL FEEDBACK
PRESSURE GOVERNOR SENSOR
SWITCH (RIGHT) ACTUATOR
MOTOR
TRAVEL
PRESSURE
SWITCH (LEFT)
 IMPLEMENT/SWING
PRESSURE SWITCH

TRAVEL PRESSURE
SWITCH (RIGHT)

TRAVEL PRESSURE
SWITCH (LEFT) STRAIGHT TRAVEL
SOLENOID

TRAVEL SWITCH
(STRAIGHT TRAVEL PEDAL)
 R

BACK-UP CIRCUIT C OFF

S ON
24V 24V
B ST

10 A

10 A 10 A

+B
IN
OUT
GND
+B
DECEL
ACCEL
KEY
F/8
ESS
GND
 ELECTRONIC CONTROL SYSTEM
ENGINE
SPEED SENSOR
ENGINE

MAIN
PUMPS

ACTION ALARM GOVERNOR LEVER

START
ENGINE SWITCH FEEDBACK SENSOR
AND
ENGINE SPEED DIAL
PUMP
BATTERY GOVERNOR
CONTROL
SWITCH PANEL ACTUATOR
BACKUP SWITCH
ENGINE COOLANT TEMPERATURE SENSOR

MONITOR
HYDRAULIC OIL TEMPERATURE SENSOR

FUEL LEVEL SENSOR

POWER SHIFT SOLENOID
ALTERNATOR
STRAIGHT TRAVEL SOLENOID

ENGINE OIL PRESSURE SENSOR TRAVEL SPEED SOLENOID

SWING PARKING BRAKE SOLENOID

MANUAL LOW IDLE SWITCH

ENGINE OIL LEVEL SWITCH TRAVEL ALARM

HYDRAULIC OIL LEVEL SWITCH AIR HEATER INDICATOR

WATER SEPARATOR
RESTRICTED AIR FILTER SWITCH
IMPLEMENT/SWING PRESSURE SWITCH
RESTRICTED HYDRAULIC RETURN FILTER INDICATOR
RIGHT TRAVEL PRESSURE SWITCH
ENGINE COOLANT LEVEL INDICATOR
TRAVEL PRESSURE SWITCH
ATTACHMENT PUMP PRESSURE SWITCH NO.1
STRAIGHT TRAVEL PRESSURE SWITCH
ATTACHMENT PUMP PRESSURE SWITCH NO.2
RIGHT PUMP (REAR) PRESSURE SWITCH
ATTACHMENT PEDAL PRESSURE SWITCH
LEFT PUMP (FRONT) PRESSURE SWITCH
PROPORTIONAL REDUCING VALVE
FOR FLOW REDUCTION PRESSURE
44

45 46

CONNECTOR 2 CONNECTOR 1
 8 9
7 10
1 BK COM 6
5
2 PK S1
4
3 BU S2
3
4 GN S3
2
5 BR S4

6 1

100

6 1

5 2

4 3
 1
2

2
 A
BK 18 A
RD 18 B C
BU 18 C
B
 R

OFF C
ON S
ST
B

ST
AR
T

T
BA

L
RO
RE

NT
LA
Y

CO
1
2
 AUT

n/min

1 L. CHASSIS
2 L. BOOM
3
4 W. INT (6)
5 W. INT (3)
6 TRAVEL MODE SW.
7 AEC MODE SW.
8 ALARM CANCEL SW.
9 +B
10 TRAVEL MODE IND. 1
11 TRAVEL MODE IND. 2
12
13
14 W. LOW
15
9 8 7 6 5 4 3 2 1 16
17 WASH
18 ALARM CANCEL IND.
19
20 19 18 17 16 15 14 13 12 11 10 20
 1
2

2
 4 3

3
2
1

4
1 +B
2 GND
1 2 3 4
3 F/B
4 ACCEL

5 DECEL
6 KEY 8 7 6 5
7 ESS

8 -
 B A

A RD +B
B BK GND
C WH SIG
1 YL

2 BK

1 2
1
2
1 +B
2 GND
1 2 3 4
3 F/B
4 ACCEL

5 DECEL
6 KEY 8 7 6 5
7 ESS

8 -
V- COM A 10A
 CONN 1
308 - YL
13
1
5
2

184 - BU
40
A

CONN 3

235 - BK

235 - BK
1
A L
10
 00:00

TRVL SPEED AUTO

 MAIN MENU
∇ PREFERENCES
SELECT TOOL
FLTR/FLUID INFO
 MAIN MENU
SELECT TOOL
FLTR/FLUID INFO
∇ SERVICE OPTIONS
ENTER PASSWORD

0000
:L / R :+/-
ENTER PASSWORD
FFF2
:L / R :+/-
 SERVICE
SWITCH STATUS
✓ 1
10
INVALID PASSWORD

✓ : RETRY
✕ : EXIT
 SERVICE
SWITCH STATUS
1
10
 EXIT
SWITCH STATUS
1
10
 00:00

TRVL SPEED AUTO

 00:00

TRVL SPEED AUTO

 MAIN MENU
∇ PREFERENCES
SELECT TOOL
FLTR/FLUID INFO
PREFERENCE MENU
SELECT LANGUAGE
ADJUST CLOCK
DISPLAY ADJ
ADJUST CLOCK

0000
:H / M :+/-
 SERVICE
SWITCH STATUS
1
10
 SERVICE
SWITCH STATUS
10
HIGH PRESS
SERVICE
STATUS
1
52.5
SERVICE
STATUS
11
1948
 SERVICE
CONFIGURATION
1
320 HYD
 SERVICE
CONFIGURATION
15
1300
 SERVICE
CONFIGURATION
39
STANDBY
 SERVICE
CONFIGURATION
39
CLEAR?
 SERVICE
ACTIVE ERROR
00 of 02
TOP
 SERVICE
ACTIVE ERROR
00 of 02
TOP
 SERVICE
ACTIVE ERROR
01 OF 02
69 : 1162 - 04
 SERVICE
LOGGED ERROR
00 OF 02
TOP
 SERVICE
LOGGED ERROR
01 OF 05
69 : 190 - 04
 SERVICE
LOGGED ERROR
00 OF 02
TOP
 SERVICE
LOGGED ERROR
02 OF 05
CLEAR?
 SERVICE
LOGGED EVENT
00 OF 05
TOP
 SERVICE
LOGGED ERROR
02 OF 05
CLEAR?
 SERVICE
LOGGED ERROR
02 OF 05
CLEAR?
 SERVICE
LOGGED ERROR
01 OF 05
CLEAR?
Select Group

Select a group:
<TEMPORARY GROUP> Parameters:
Excavator 320C Group 1 Excavator 320C OK
Excavator 320C Group 2 Engine Speed
Excavator 320C Group 3
Excavator 320C Group 4
Throttle Cab Switch Position
Engine Oil Level
Cancel
Excavator 320C Group 5 Engine Oil Pressure Status
Excavator 320C Group 6
Excavator 320C Group 7
Coolant Level New
Engine Coolanat Temperature
Fuel Gauge
Change
Delete

Excavator 320C
Excavator 320C

Excavator 320C Group 1

Excavator 320C

0RPM Engine Speed

1 Throttle Cab Switch
OK Engine Oil Level
Engine Oil Pressure Status
OK Coolant Level
66 Deg F Engine Coolant
Unavailable % Fuel Gauge

Groups... Zoom In More Hold Print

Excavator 320C
Excavator 320C

Excavator 320C Group 1

Excavator 320C

Unavailable Air Filter Restriction Status

Unavailable Alternator Status
Unavailable Volts Battery Voltage
Unavailable System Voltage Status
Unavailable Low Idle Switch

Groups... Zoom In More Hold Print

Excavator 320C
(1) - (2) CONN56 M
 SERVICE
SWITCH STATUS
1
10
 SERVICE
DEVICE TEST
ENG SPEED - FIXED
STANDBY
 SERVICE
DEVICE TEST
ENG SPEED - FIXED
STANDBY
 SERVICE
DEVICE TEST
ENG SPEED - FIXED
STANDBY
 SERVICE
DEVICE TEST
ENG SPEED - FIXED
1948
 SERVICE
DEVICE TEST
ENG SPEED - FIXED
SUCCESS
 SERVICE
DEVICE TEST
ENG SPEED-SWEEP
STANDBY
 SERVICE
DEVICE TEST
ENG SPEED-SWEEP
STANDBY
 SERVICE
DEVICE TEST
ENG SPEED-SWEEP
STANDBY
 SERVICE
DEVICE TEST
ENG SPEED-SWEEP
SUCCESS
 SERVICE
DEVICE TEST
ENG SPEED-SWEEP
ERROR 21
 SERVICE
SWITCH STATUS
1
10
 SERVICE
CALIBRATION
GOVERNOR-EXE
STANDBY
 SERVICE
CALIBRATION
GOVERNOR-EXE
STANDBY
 SERVICE
CALIBRATION
GOVERNOR-EXE
SP
 SERVICE
CALIBRATION
GOVERNOR-EXE
3
 SERVICE
CALIBRATION
GOVERNOR-EXE
SUCCESS
 SERVICE
CALIBRATION
GOVERNOR-EXE
STANDBY
 SERVICE
CALIBRATION
GOVERNOR-EXE
STANDBY
 SERVICE
CALIBRATION
GOVERNOR-CLEAR
STANDBY
 SERVICE
CALIBRATION
GOVERNOR-CLEAR
STANDBY
 SERVICE
CALIBRATION
GOVERNOR-CLEAR
CLEAR?
 SERVICE
CALIBRATION
GOVERNOR-CLEAR
CLEARED
 SERVICE
CALIBRATION
GOVERNOR-EXE
STANDBY
 SERVICE
CALIBRATION
PS PRV - LOW
STANDBY
 SERVICE
CALIBRATION
PS PRV - LOW
STANDBY
 SERVICE
CALIBRATION
PS PRV - LOW
STANDBY
 SERVICE
CALIBRATION
PS PRV - LOW
0
 SERVICE
CALIBRATION
PS PRV - LOW
ERROR 21