caterpillar

1. POSNEG
DISCONNECT
SWITCH
BATTERY
ALTERNATOR
BREAKER
MAIN RELAY
STARTER
RELAY
NEUTRAL
START
RELAY
STARTER
MOTOR
STARTER
SWITCH
TIMER
RELAY
STARTER
CONTROL
RELAY
NEUTRAL
START SW.
ALTERNATOR
GOVERNOR
ACTUATOR
HEATER
CONTROL UNIT
HEATER
RELAY
AIR
HEATER
HORN
AIR CONDITIONER
CAB HEATER
CONTROLLER
SWITCH PANEL
LIGHTS
WINDSHIELD WASHER
CIGAR LIGHTER
LOW CURRENT CIRCUITPOWER CIRCUIT
START/STOP CIRCUIT
CHARGING
CIRCUIT
FUSE PANEL
WINDSHIELD WIPER
BASIC ELECTRICAL SYSTEM
G S
MTR BAT
MOTOR

2. POSNEG POSNEG
DISCONNECT
SWITCH
BATTERY
ALTERNATOR
BREAKER
MAIN RELAY
STARTER
RELAY
NEUTRAL
START
RELAY
STARTER
MOTOR
STARTER
SWITCH TIMER
RELAY
STARTER
CONTROL
RELAY
NEUTRAL
START SW.
ALTERNATOR
GOVERNOR
ACTUATOR
HEATER
CONTROL
UNIT
HEATER
RELAY
AIR
HEATER
HORN
AIR
CONDITIONER
CAB HEATER
CONTROLLER
SWITCH PANEL
LIGHTS
WINDSHIELD
WASHER
WINDSHIELD
WIPER
CIGAR
LIGHTER
LOW CURRENT CIRCUITPOWER CIRCUIT
START/STOP CIRCUIT
CHARGING
CIRCUIT
FUSE PANEL
BASIC ELECTRICAL SYSTEM
G S
MTR BAT
MOTOR

3. AIR CONDITIONER
CAB HEATER
SWITCH PANEL
LIGHTS
WINDSHIELD WASHER
WINDSHIELD WIPER
CIGAR LIGHTER
HORN
CONTROLLER
FUSE PANEL
LOW CURRENT CIRCUIT
ALTERNATOR
BREAKER
DISCONNECT
SWITCH
BATTERY
STARTER
RELAY
NEUTRAL
START
RELAY
STARTER
MOTOR
STARTER
CONTROL
RELAY
NEUTRAL
START SW.
POWER CIRCUIT
START/STOP CIRCUIT
CHARGING CIRCUIT
GOVERNOR
ACTUATOR
TIMER
RELAY
STARTER
SWITCH
HEATER
RELAY
AIR
HEATER
HEATER
CONTROL UNIT
ENGINE
COOLANT
TEMP. SW.
START AID
SOLENOID
START AID
SWITCH
MAIN
RELAY
ALTERNATOR
POSNEG
BASIC ELECTRICAL SYSTEM
G S
MTR BAT
MOTOR

4. 308-YL
200-BK
308-YL
101-RD-6
MAIN
RELAY
R
C
S
B ST
OFF
ON
START SWITCH
200-BK-6
B
POS NEG
RD-00 RD-00
POS NEG
109-RD-6
BK-00
BATTERIES
60A
1N
+B
OUT
GND
TIMER RELAY
CIRCUIT BREAKER FOR
THE ALTERNATOR
POWER
CIRCUIT 15 A
179-BU
120-YL
123-WH-18
160-PU
129-BU
169-PK-18
152-BU
1118-GY
113-OR-18
124-GY-14
5 A
10 A
10 A
10 A
10 A
5 A
10 A
10 A
10 A
5 A
15 A
10 A
10 A
10 A
10 A
10 A
15 A
5 A
180-GN
149-PU
191-WH-14
143-BR-18
147-PU
5 A
FUSE PANEL
C987-RD-14
107-RD-14
184-RD
105-RD
103-RD
115-RD
114-RD
110-RD
175-RD-14
168-RD-14
15 A
10 A
10 A
10 A
10 A
10 A
15 A
15 A
15 A
10A
15 A
10 A
176-RD
FUSE PANEL
200-BK
308-YL
110-RD
200-BK
4
1
3
2
112-PU-6
101-RD-6
101-RD-6
308-YL
308-YL
101-RD-6
101-RD-6
ALTERNATOR
105-RD
G S
MTR BAT
MOTOR
ALT
R
E
P
L

5. R
C
S
B ST
OFF
ON
105-RD
200-BK-18
308-YL-18
200-BK-18
308-YL
180-GN
309-GY-18
191-WH-14
150-OR-18
147-PU
179-BU
120-YL
123-WH-18
160-PU
129-BU
169-PK-18
152-BU
118-GY
113-OR-18
124-GN-14
30 A
5 A
10 A
15 A
10 A
10 A
10 A
10 A
10 A
15 A
10 A
10 A
POS NEG
101-RD-4
RD-00 RD-00
POS NEG
101-RD-6
BK-00
109-RD-6
ALT
R
200-BK-6
E
P
B
L
101-RD-6
101-RD-6
101-RD-6
60A
109-RD-6
10 A
5 A
5 A
15 A
5 A
10 A
10 A
10 A
5 A
10 A
10 A
5 A
10 A
10 A
5 A
10 A
168-RD-10
130-RD-14
149-RD
184-RD
103-RD
115-RD
114-RD
175-RD-14
110-RD
105-RD
112-PU-6
308-YL
308-YL
308-YL
110-RD
200BK
1N
+B
OUT
GND
4
1
3
2
START SWITCH
TIMER RELAY
FUSE PANEL
MAIN
RELAY
FUSE PANEL
ALTERNATOR
CIRCUIT BREAKER FOR
THE ALTERNATOR
BATTERIES
POWER CIRCUIT
G S
MTR BAT
MOTOR

6. 308-YL
200-BK
308-YL
112-PU-6
308-YL
MAIN
RELAY
R
C
S
B ST
OFF
ON
308-YL
324-RD
307-OR
105-RD
START SWITCH
10
7
12
4
ALT
R
200-BK-6
E
P
B
L
POS NEG
101-RD-4
RD-00 RD-00
POS NEG
101-RD-6
BK-00
BATTERIES
60A
1N
GND
OUT
+B
TIMER RELAY
CIRCUIT BREAKER FOR
THE ALTERNATOR
POWER CIRCUIT
5 A
179-BU
120-YL
147-PU
113-OR-18
129-BU
152-BU
123-WH-18
169-PK-18
160-PU
118-GY
5 A
10 A
10 A
10 A
10 A
5 A
5 A
10 A
10 A
5 A
10 A
10 A
10 A
15 A
5 A
15 A
5 A
10 A 130-GN
166-BR-18
191-WH-14
150-OR-18
124-GN-14
10 A
FUSE
PANEL
15 A
168-RD-19
175-RD-14
103-RD
C987-RD-14
184-RD
149-RD
105-RD
115-RD
110-RD
114-RD
FUSE PANEL
30 A
10 A
10 A
10 A
10 A
5 A
5 A
10 A
10 A
15 A
10 A
15A
30 A
10 A
200-BK
308-YL
200-BK
109-RD-6
4
2
3
1
109-RD-6
109-RD-6
105-RD
1
5
10
7
308-YL
105-RD
308-YL
112-PU-6
101-RD-6G S
MTR BAT
MOTOR

7. POS NEG
308-YL
101-RD-4
RD-00 RD-00
POS NEG
101-RD-6
BK-00
R
C
S
B ST
OFF
ON
1
2
304-WH-8 304-WH-8
109-RD-6
109-RD-8
ALT
R
109-RD-6
200-BK-6
E
P
B
L
403-GN-18
330-YL
403-GN-18
K776-GN-18
309-GY-18
200-BK-18
WH/BU
WH/YL
YL
WH/GN
BK
308-YL
110-RD
189-RD
200-BK
1N
+B
OUT
GND
4
1
3
2
306-GN
C
A
B
307-OR
105-RD105-RD
110-RD
107-RD-14
189-RD
154-RD
151-GN
BK-18
RD-18
WH-18
101-RD-6
101-RD-6
10 A
10 A
101-RD-6
200-BK-18
308-YL-18
200-BK-18
308-YL
60A
KEY START SWITCH
TIMER RELAY
ENGINE SHUTDOWN TIMER
STARTER CONTROL RELAY
STARTER MOTOR
BATTERIES
ALTERNATOR
NEUTRAL
START RELAY
NEUTRAL
START SWITCH
STARTER
RELAY
STARTER SOLENOID
10 A
308-YL
308-YL
S
P
L
R
GND
308-YL-18
107-RD-14
227-PK-14
200-BK-18
GN-18
RD-14
BK-18
BU-14
3
1
4
2
ON (KEY)
+ BATTERY
SOLENOID
GND
327-PK-14 6 327-PK-14
START AND STOP CIRCUIT
G S
MTR BAT
MOTOR
ENGINE SHUTDOWN
SOLENOID

8. POS NEG
308-YL
101-RD-4
RD-00 RD-00
POS NEG
101-RD-6
BK-00
R
C
S
B ST
OFF
ON
1
2
304-WH-8 304-WH-8
109-RD-6
109-RD-8
ALT
R
109-RD-6
200-BK-6
E
P
B
L
403-GN-18
300-YL
403-GN-18
200-BK-18
WH/BU
WH/YL
BK
S
P
GND
308-YL
189-RD
200-BK
KEY
+B
GND
6
1
2
308-YL
110-RD
189-RD
200BK
1N
+B
OUT
GND
4
1
3
2
306-GN
C
A
B
307-OR
105-RD
105-RD
110-RD
189-RD
154-RD
BK-18
RD-18
WH-18
101-RD-6
101-RD-6
10 A
10 A
101-RD-6
200-BK-18
308-YL-18
200-BK-18
308-YL
308-YL
308-YL
60A
KEY START SWITCH
TIMER RELAY
GOVERNOR ACTUATOR
STARTER CONTROL RELAY
STARTER MOTOR
BATTERIES
ALTERNATOR
NEUTRAL
START
RELAY
NEUTRAL START SWITCH
STARTER RELAYSTARTER SOLENOID
START AND STOP CIRCUIT
G S
MTR BAT
MOTOR

9. POS NEG
101-RD-4
RD-00 RD-00
POS NEG
101-RD-6
BK-00
R
C
S
B ST
OFF
ON
KEY START SWITCH
308-YL
326-RD
307-OR
105-RD
10
7
12
4
C
A
B
189-RD
154-RD
308-YL
105-RD
BK-18
RD-18
WH-18
NEUTRAL
START SWITCH5
10
11
7
326-RD
307-OR5
2
1
109-RD-8
STARTER
RELAY
304-WH-8
ALT
200-BK-6
B-
B+
R
D
10 A
NEUTRAL
START RELAY
308-YL
200-BK
300-YL
60A
STARTER MOTOR
BATTERIES
ALTERNATOR
STARTER SOLENOID
10 A
308-YL
G S
MTR BAT
MOTOR
200-BK-18
109-RD-6
101-RD-6
+B
GND
1
2
200-BK-10
301-BU-10
326-RD 1
109-RD-6 109-RD-6
109-RD-6
189-RD 9 189-RD
308-YL
189-RD
110-RD
GDN
IN
OUT
+B
2
4
3
1
TIMER RELAY
304-WH-8
304-WH-8
200-BK-18
200-BK
200-BK
200-BK
3
200-BK
326-RD 326-RD
105-RD
101-RD
307-OR
154-RD
START AND STOP CIRCUIT

10. POS NEG
BK-18
RD-18
WH-18
154-RD200BK-18
307-OR
308-YL
A718-PU-18
200-BK-18
308-YL-18
306-GN
A718-PU-18
310-PK-18
403-GN-18
200-BK-18
KEY SW. (ON)
KEY SW. (START)
TEMPERATURE
INDICATOR
RELAY
REGULATOR
CHECK TERM.
GND
101-RD-4
RD-00 RD-00
POS NEG
101-RD-4 877-YL-4 877-YL-4
BK-00
R
C
S
B ST
OFF
ON
T°
1
2
STARTER SWITCH
HEATER CONTROL UNIT
HEATER
RELAY AIR HEATER
STARTING AID
CIRCUIT
G S
MTR BAT
MOTOR
ALT P
R
B
E
L
200BK-18
C
A
B
200BK-18

11. POS NEG
BK-18
RD-18
WH-18
154-RD200BK-18
307-OR
308-YL
A718-PU-18
200-BK-18
306-GN
308-YL-18
306-GN
A718-PU-18
310-PU-18
200-BK-18
200-BK-18
200-BK-18
KEY SW. (ON)
KEY SW. (START)
TEMPERATURE
INDICATOR
RELAY
REGULATOR
CHECK TERM.
GND.
101-RD-4
RD-00 RD-00
POS NEG
101-RD-4 877-YL-4 877-YL-4
BK-00
R
C
S
B ST
OFF
ON
T°
1
2
STARTER SWITCH
HEATER CONTROL UNIT
HEATER RELAY AIR HEATER
STARTING AID
CIRCUIT
G S
MTR BAT
MOTOR

12. POS NEG
101-RD-4
RD-00 RD-00
POS NEG
101-RD-4 877-YL-4
BK-00
HEATER
RELAY
AIR
HEATER
G S
MTR BAT
MOTOR
3
4
L975-PK-18
A713-PU-18
4L975-PK-18
200-BK-18 T°
1
2
A713-PU-18
2
1
RD-18
WH-18
BK-18
200BK-18
307-OR
STARTER SWITCH
308-YL
306-GN
308-YL-18
306-GN
L975-PK-18
A713-PU-18
310-PU-18
200-BK-18
KEY SW. (ON)
KEY SW. (START)
TEMPERATURE
INDICATOR
RELAY
REGULATOR
CHECK TERM.
GND
HEATER CONTROL UNIT
322C
STARTING AID
CIRCUIT
200BK-18
5
11 A
B
C
10
12
308-YL
307-OR
154-RD
15
1653
1
2
310-PU
311-WH-18
311-WH-18
200BK-18
307-OR
ENGINE COOLANT
TEMPERATURE SW.
START AID
SOLENOID
START AID SW.
307-OR
307-OR
307-OR
11
154-RD
310-PU310-PU
308-YL
T°
R
C
S
B ST
OFF
ON

13. 30 A
5 A
10 A
15 A
10 A
10 A
10 A
10 A
10 A
15 A
10 A
10 A
POS NEG
101-RD-4
RD-00 RD-00
POS NEG
101-RD-6
BK-00
109-RD-6
ALT
R
200-BK-6
E
P
B
L
101-RD-6
101-RD-6
101-RD-6
60A
109-RD-6
112-PU-6
10 A
5 A
5 A
15 A
10 A
10 A
10 A
5 A
10 A
10 A
5 A
10 A
10 A
5 A
15 A
5 A
BATTERIES
BREAKER FOR
THE ALTERNATOR
ALTERNATOR
CHARGING CIRCUIT
G S
MTR BAT
MOTOR

14. POS NEG
101-RD-4
RD-00 RD-00
POS NEG
101-RD-6
BK-00
ALT
200-BK-6
B-
B+
R
D
60A
109-RD-6
BATTERIES
BREAKER FOR
THE ALTERNATOR
ALTERNATOR
CHARGING CIRCUIT
G S
MTR BAT
MOTOR
103-RD
C987-RD-14
184-RD
149-RD
105-RD
115-RD
110-RD
114-RD
175-RD-14
15 A
10 A
10 A
10 A
10 A
10 A
10 A
15 A
10 A
15A
30 A
30 A
168-RD-10
101-RD-6
109-RD-6
109-RD-6
1200-BK
308-YL
112-PU-6
179-BU
120-YL
147-PU
113-OR-18
129-BU
152-BU
123-WH-18
169-PK-18
160-PU
118-GY
180-GN
166-BR-18
191-WH-14
150-OR-18
124-GN-14
5 A
5 A
10 A
10 A
10 A
10 A
5 A
5 A
10 A
10 A
5 A
10 A
10 A
10 A
15A
5 A
15 A
5 A
10 A
10 A

15. T°
FUEL LEVEL SENSOR
1
2
YL
BK
CONN. 83
CHASSIS
235-BK
COOLANT
TEMPERATURE SENSOR235-BK
495-GN
492-GY
T°235-BK
491-PK
CHASSIS
CHASSIS
HYDRAULIC OIL
TEMPERATURE SENSOR
ENGINE OIL
PRESSURE SWITCH
HYDRAULIC OIL
FILTER SWITCH
2
1
RD
BK
CHASSIS
235-BK
497-OR
CHASSIS 235-BK
CONN. 97
SIGNAL
GROUND
CONN. 95
AIR CLEANER
SWITCH
CHASSIS
235-BK
CONN. 185
CONN. 13
INDICATOR
HEATER
CONTROL LIMIT
CONN. 20
L975-PK
R
C
S
BST
OFF
ON
CONN. 47
START SW.
10
4
308-YL
105-RD 7105-RD
CONN. 36
CONN. 10
308-YL
BK-00 RD-00 RD-00
200-BK
BATTERIES
DISCONNECT
SWITCH
BK-00
MAIN RELAY
112-PU5 A
FUSE (BACKUP
MONITOR CONTROL)
169-PK
5 A
101-RD103-RD 10 A
FUSE (DOME
LAMP/MEMORY)
101-RD105-RD
FUSE (KEY SW.)
ALT. BREAKER
109-RD
101-RD
TERMINAL
BLOCK
101-RD
CHASSIS
9
8
13 189-PK
11
10
9
B
A
101-RD
893-GN
892-BR
7
3
1
4
8
5
6
2
7
3
1
4
8
5
6
2
807-PK
189-PK
103-RD
893-GN
892-BR
201-BK
169-PK
103-RD
893-GN
892-BR
201-BK
LIGHT
ACC
+B
CDL+
CDL-
GND
MONITOR CONN. 52 CONN. 73
CONN. 73
CONN. 73
CONN. 11
CONN. 105
41
42
46
4
40
31
32
33
43
23
CONN. 172
30
29
33
47
35
CONN. 171
FUEL LEVEL
COOLANT TEMP. SENSOR
BACKUP SW.
ALT. R TERM.
ENG. OIL PRESS. SW.
CUPSUL FILTER PLUGGED
AIR CLEANER PLUGGED
AIR HEATER CONTROLLER
ENG OIL LEVEL SW.
COOLANT LEVEL SW.
HYD OIL LEVEL SW.
CDL +
CDL -
KEY SW. DN.
405-GY
497-OR
430-BU
L975-PK
C468-BU
412-BU
496-WH
883-GN
892-BR
308-YL
495-GN
492-GY
491-PK
M736-BU
403-GN
9
12
M736-BU
235-BK
M736-BU
235-BK
CONN. 106 CONN. 37
M736-BU
235-BK
BACKUP SW.
403-GN
CHASSIS
ALTERNATOR
109-RD
405-GY
430-BU
312C ENGINE AND
PUMP CONTROL
CIRCUIT
7
CONN. 108
10 A
60A
POSNEG POSNEG
ALT
R
E
P
B
L
6
10
CONN. 106
1
1
2
CONN. 96
CHASSIS
235-BK
C468-BU ENGINE OIL
LEVEL SWITCH
1
2
CONN. 1
CHASSIS
235-BK
412-BU
1
2
CONN. 84
CHASSIS
235-BK
496-WH
COOLANT
LEVEL
SWITCH
HYDRAULIC
OIL
LEVEL
SWITCH
G S
MTR BAT
MOTOR

16. T°
FUEL LEVEL SENSOR
1
2
YL
BK
CONN. 90
CHASSIS
235-BK
COOLANT
TEMPERATURE SENSOR235-BK
495-GN
492-GY
T°235-BK
491-PK
CHASSIS
CHASSIS
HYDRAULIC OIL
TEMPERATURE SENSOR
ENGINE OIL
PRESSURE SWITCH
HYDRAULIC OIL
FILTER SWITCH
2
1
RD
BK
CHASSIS
235-BK
497-OR
CHASSIS 235-BK
CONN. 97
SIGNAL
GROUND
CONN. 95
AIR CLEANER
SWITCH
CHASSIS
235-BK
CONN. 5
CONN. 27
INDICATOR
HEATER
CONTROL LIMIT
CONN. 19
L975-PK
R
C
S
BST
OFF
ON
CONN. 51
START SW.
10
4
308-YL
105-RD 7105-RD
CONN. 44
CONN. 24
308-YL
BK-00 RD-00 RD-00
200-BK
BATTERIES
DISCONNECT
SWITCH
BK-00
MAIN RELAY
112-PU5 A
FUSE (BACKUP
MONITOR CONTROL)
169-PK
5 A
101-RD103-RD 10 A
FUSE (DOME
LAMP/MEMORY)
101-RD105-RD
FUSE (KEY SW.)
ALT. BREAKER
109-RD
101-RD
TERMINAL
BLOCK
101-RD
CHASSIS
9
8
13 189-PK
11
10
9
2
1
7
101-RD
893-GN
892-BR
7
3
1
4
8
5
6
2
7
3
1
4
8
5
6
2
807-PK
189-PK
103-RD
893-GN
892-BR
201-BK
169-PK
103-RD
893-GN
892-BR
201-BK
LIGHT
ACC
+B
CDL+
CDL-
GND
MONITOR CONN. 59 CONN. 58
CONN. 52
CONN. 52
CONN. 25
CONN. 109
41
42
46
4
40
31
32
33
43
23
CONN. 72
30
29
33
47
35
CONN. 71
FUEL LEVEL
COOLANT TEMP. SENSOR
BACKUP SW.
ALT. R TERM.
ENG. OIL PRESS. SW.
CUPSUL FILTER PLUGGED
AIR CLEANER PLUGGED
AIR HEATER CONTROLLER
ENG OIL LEVEL SW.
COOLANT LEVEL SW.
HYD OIL LEVEL SW.
CDL+
CDL-
KEY SW. DN.
405-GY
497-OR
430-BU
L975-PK
C468-BU
412-BU
496-WH
883-GN
892-BR
308-YL
495-GN
492-GY
491-PK
M736-BU
403-GN
9
12
M736-BU M736-BU
235-BK
CONN. 106 CONN. 45
M736-BU
235-BK
BACKUP SW.
403-GN
CHASSIS
ALTERNATOR
109-RD
405-GY
430-BU
315C ENGINE AND
PUMP CONTROL
CIRCUIT
10 A
60A
POSNEG POSNEG
ALT
R
E
P
B
L
10
1
1
2
CONN. 96
CHASSIS
235-BK
C468-BU ENGINE OIL
LEVEL SWITCH
CONN. 1
CHASSIS
235-BK
412-BU
1
2
CONN. 92
CHASSIS
235-BK
496-WH
COOLANT
LEVEL
SWITCH
HYDRAULIC
OIL
LEVEL
SWITCH
G S
MTR BAT
MOTOR

17. T°
FUEL LEVEL SENSOR
1
2
YL
BK
CONN. 179
CHASSIS
235-BK
COOLANT
TEMPERATURE SENSOR235-BK
495-GN
492-GY
T°235-BK
491-PK
CHASSIS
CHASSIS
HYDRAULIC OIL
TEMPERATURE SENSOR
ENGINE OIL
PRESSURE SWITCH
HYDRAULIC OIL
FILTER SWITCH
2
1
RD
BK
CHASSIS
235-BK
497-OR
CHASSIS 235-BK
CONN. 16
SIGNAL
GROUND
CONN. 137
AIR CLEANER
SWITCHCHASSIS 235-BK
CONN. 185
CONN. 87
9
8
7
6
5
4
3
2
1
INDICATOR
HEATER
CONTROL LIMIT
CONN. 85
L975-PK
R
C
S
BST
OFF
ON
CONN. 42
START SW.
10
4
308-YL
105-RD 7105-RD
CONN. 53
CONN. 82
308-YL
BK-00
RD-00 RD-00
ALT
R
E
P
B
L
200-BK
BATTERIES
DISCONNECT
SWITCH
BK-00
MAIN RELAY
112-PU5 A
FUSE (BACKUP
MONITOR CONTROL)
169-PK
101-RD103-RD 10 A
FUSE (DOME
LAMP/MEMORY)
101-RD105-RD 10 A
FUSE (KEY SW.) ALT. BREAKER
109-RD
101-RD
TERMINAL
BLOCK
101-RD
CHASSIS
9
8
13 189-PK
11
10
9
41
40
101-RD
893-GN
892-BR
7
3
1
4
8
5
6
2
7
3
1
4
8
5
6
2
807-PK
189-PK
103-RD
893-GN
892-BR
201-BK
169-PK
103-RD
893-GN
892-BR
201-BK
LIGHT
ACC
+B
CDL+
CDL-
GND
MONITOR CONN. 7 CONN. 8
CONN. 1
CONN. 1
CONN. 83
CONN. 51
41
42
46
4
33
43
23
CONN. 72
30
29
33
47
35
CONN. 71
FUEL LEVEL
COOLANT TEMP. SENSOR
BACKUP SW.
ALT. R TERM.
ENG. OIL PRESS. SW.
CUPSUL FILTER PLUGGED
AIR CLEANER PLUGGED
AIR HEATER CONTROLLER
CDL+
CDL-
KEY SW. DN.
405-GY
497-OR
430-BU
L975-PK
883-GN
892-BR
308-YL
495-GN
492-GY
491-PK
M736-BU
403-GN
8
32
9
12
M736-BU
235-BK
M736-BU
235-BK
CONN. 51 CONN. 54
M736-BU
235-BK
BACKUP SW.
403-GN
CHASSIS
ALTERNATOR
109-RD
405-GY
430-BU
320C ENGINE AND
PUMP CONTROL
CIRCUIT
1
2
3
4
5
6
G S
MTR BAT
MOTOR
60A
5 A
POSNEG POSNEG

18. T°
FUEL LEVEL SENSOR
1
2
YL
BK
CONN. 83
CHASSIS
235-BK
COOLANT
TEMPERATURE SENSOR235-BK
495-GN
492-GY
T°235-BK
491-PK
CHASSIS
CHASSIS
HYDRAULIC OIL
TEMPERATURE SENSOR
ENGINE OIL
PRESSURE SWITCH
HYDRAULIC OIL
FILTER SWITCH
1
2
RD
BK
CHASSIS
235-BK
497-OR
CHASSIS
235-BK
CONN. 118
SIGNAL
GROUND
CONN. 137
AIR CLEANER
SWITCH
CHASSIS
235-BK
CONN. 185
CONN. 87
INDICATOR
HEATER
CONTROL LIMIT
CONN. 85
L975-PK
R
C
S
BST
OFF
ON
CONN. 47
START SW.
10
4
308-YL
105-RD 7105-RD
CONN. 52
CONN. 82
308-YL
BK-00 RD-00 RD-00
200-BK
BATTERIES
DISCONNECT
SWITCH
BK-00
MAIN RELAY
112-PU5 A
FUSE (BACKUP
MONITOR CONTROL)
169-PK
5 A
101-RD103-RD 10 A
FUSE (DOME
LAMP/MEMORY)
101-RD105-RD
FUSE (KEY SW.)
ALT. BREAKER
109-RD
101-RD
TERMINAL
BLOCK
101-RD
CHASSIS
9
8
13 189-PK
11
10
9
41
40
45
101-RD
893-GN
892-BR
7
3
1
4
8
5
6
2
7
3
1
4
8
5
6
2
807-PK
189-PK
103-RD
893-GN
892-BR
201-BK
169-PK
103-RD
893-GN
892-BR
201-BK
LIGHT
ACC
+B
CDL+
CDL-
GND
MONITOR CONN. 7 CONN. 6
CONN. 1
CONN. 1
CONN. 82
CONN. 57
41
42
46
4
40
31
32
33
43
23
CONN. 172
30
29
33
47
35
CONN. 171
FUEL LEVEL
COOLANT TEMP. SENSOR
BACKUP SW.
ALT. R TERM.
ENG. OIL PRESS. SW.
CUPSUL FILTER PLUGGED
AIR CLEANER PLUGGED
AIR HEATER CONTROLLER
ENG OIL LEVEL SW.
COOLANT LEVEL SW.
HYD OIL LEVEL SW.
CDL+
CDL-
KEY SW. DN.
405-GY
497-OR
430-BU
L975-PK
C468-BU
412-BU
496-WH
883-GN
892-BR
308-YL
495-GN
492-GY
491-PK
M736-BU
403-GN
9
12
M736-BU
235-BK
M736-BU
235-BK
CONN. 51 CONN. 54
M736-BU
235-BK
BACKUP SW.
403-GN
CHASSIS
ALTERNATOR
109-RD
405-GY
430-BU
322C ENGINE AND
PUMP CONTROL
CIRCUIT
10 A
60A
POSNEG POSNEG
ALT
R
E
P
B
L
3
32
1
1
2
C468-BU ENGINE OIL
LEVEL SWITCH
1
2
CONN. 173
CHASSIS
235-BK
412-BU
1
2
CONN. 138
CHASSIS
235-BK
496-WH
COOLANT
LEVEL
SWITCH
HYDRAULIC
OIL
LEVEL
SWITCH
G S
MTR BAT
MOTOR
3
A
B
CONN. 113
CONN. 115
2
1
CONN. 119
5

19. POWER SHIFT PRV
RIGHT PUMP OUTPUT
PRESSURE SENSOR
LEFT PUMP OUTPUT
PRESSURE SENSOR
MONITOR
ENGINE SPEED DIAL
ENGINE SPEED
SENSOR
ENGINE
GOVERNOR ACTUATOR
AND FEEDBACK SENSOR
ENGINE
AND
PUMP
CONTROL
PUMP
ENGINE AND PUMP REGULATION

24. ENGINE
ENGINE
SPEED SENSOR
GOVERNOR
LEVER
FEEDBACK
SENSOR
GOVERNOR
ACTUATOR
SWITCH PANEL
MONITOR ENGINE
AND
PUMP
CONTROL
AUTOMATIC ENGINE SPEED CONTROL CIRCUIT (AEC)

25. ENGINE
AND
PUMP
CONTROL
ENGINE
GOVERNOR
LEVER
FEEDBACK
SENSOR
GOVERNOR ACTUATOR
MOTOR
TRAVEL PRESSURE
SWITCH (LEFT)
TRAVEL PRESSURE
SWITCH (RIGHT)
IMPLEMENT/SWING
PRESSURE SWITCH
ENGINE SPEED DIAL
ONE-TOUCH LOW
IDLE SWITCH
ONE-TOUCH
LOW IDLE CONTROL CIRCUIT

26. IMPLEMENT SWING
PRESSURE SWITCH
TRAVEL PRESSURE
SWITCH (RIGHT)
TRAVEL PRESSURE
SWITCH (LEFT)
TRAVEL SWITCH
(STRAIGHT
TRAVEL PEDAL)
STRAIGHT TRAVEL
SOLENOID
ENGINE
AND
PUMP
CONTROL
STRAIGHT TRAVEL CONTROL

27. 10 A 10 A
10 A
+B
IN
OUT
GND
12V 12V
+B
DECEL
ACCEL
KEY
F/8
ESS
GND
R
C
S
B ST
OFF
ONBACK-UP CIRCUIT
STARTER
SW.
CONTROLLER
TRAVEL
CONTROL SW.
MAIN RELAY
TIMER
RELAY
GOVERNOR
ACTUATOR
BACKUP SW.
SWING
BRAKE
SOLENOID
PROPORTIONAL
REDUCING
VALVE
BACKUP
REGISTER
SWING
BRAKE
CIRCUIT
DRIVE
CIRCUIT
GOVERNOR
ACTUATOR
CIRCUIT

29. LEFT PUMP (FRONT) PRESSURE SWITCH
RIGHT PUMP (REAR) PRESSURE SWITCH
STRAIGHT TRAVEL PRESSURE SWITCH
STRAIGHT TRAVEL PRESSURE SWITCH
RIGHT TRAVEL PRESSURE SWITCH
IMPLEMENT/SWING PRESSURE SWITCH
WATER SEPARATOR
HYDRAULIC OIL LEVEL SWITCH
ENGINE OIL LEVEL SWITCH
MANUAL LOW IDLE SWITCH
ENGINE OIL PRESSURE SENSOR
ALTERNATOR
FUEL LEVEL SENSOR
HYDRAULIC OIL TEMPERATURE SENSOR
ACTION ALARM
ENGINE SPEED DIAL
SWITCH PANEL
ENGINE COOLANT TEMPERATURE SENSOR
PROPORTIONAL REDUCING VALVE FOR AUX. HYDRAULICS
ATTACHMENT PUMP PRESSURE SWITCH
ATTACHMENT PEDAL PRESSURE SWITCH NO.1
ATTACHMENT PEDAL PRESSURE SWITCH NO.2
ENGINE COOLANT LEVEL INDICATOR
RESTRICTED HYDRAULIC RETURN FILTER INDICATOR
RESTRICTED AIR FILTER SWITCH
AIR HEATER INDICATOR
TRAVEL ALARM
SWING PARKING BRAKE SOLENOID
TRAVEL SPEED SOLENOID
STRAIGHT TRAVEL SOLENOID
POWER SHIFT SOLENOID
MONITOR
BACK-UP SWITCH
START
SWITCH
ENGINE
ENGINE
SPEED SENSOR
MAIN
PUMPS
GOVERNOR LEVER
FEEDBACK SENSOR
GOVERNOR
ACTUATOR
BATTERY
ELECTRONIC CONTROL SYSTEM
ENGINE
AND
PUMP
CONTROL

30. CONNECTOR 2 CONNECTOR 1
ENGINE AND
PUMP CONTROL

32. UP
LEFT
DOWN
RIGHT CANCEL
OK
MENU
SETTING

33. 1
2
3
4
5
6
BK
PK
BU
GN
BR
COM
S1
S2
S3
S4
1
2
3
4
5
6
7
8 9 10
1
2
3
6
5
4

34. 1
2
12

35. A
B
C
BK 18
RD 18
BU 18
A
C
B

36. R
C
S
B
ON
OFF
ST
CO
NTRO
L
RELAY
BAT
STA
R
T

38. 1
2

39. 34
43
21

40. 3 2 15 4
17 16 15 14 13 12 11 1020 19 18
9 8 7 6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
L. CHASSIS
L. BOOM
W. INT (6)
W. INT (3)
TRAVEL MODE SW.
AEC MODE SW.
ALARM CANCEL SW.
+B
TRAVEL MODE IND. 1
TRAVEL MODE IND. 2
W. LOW
WASH
ALARM CANCEL IND.
AEC MODE IND
GND
AUT
n/min

42. 1
2 3 4
8 7 6 5
12
3
4
5
6
7
8
+B
GND
F/B
ACCEL
DECEL
KEY
ESS
-

43. A
B
C
RD
BK
WH
+B
GND
SIG
AB
C

44. YL
BK
1
2
1 2

45. T°

46. 1
2

53. 1
2 3 4
8 7 6 5
12
3
4
5
6
7
8
+B
GND
F/B
ACCEL
DECEL
KEY
ESS
-

54. 13
1
5
2
40
CONN 1
235-BK
A
A
10
L
CONN 3
184-BU
308 - YL
1
235-BK

56. UP
LEFT
DOWN
RIGHT CANCEL
OK
MENU
SETTING

57. UP
LEFT
DOWN
RIGHT CANCEL
OK
MENU
SETTING

58. 00:00
TRVL SPEED AUTO
INSTALL TOOL #1

59. MAIN MENU
PREFERENCES
SELECT TOOL
FLTR/FLUID INFO

60. MAIN MENU
SELECT TOOL
FLTR/FLUID INFO
SERVICE OPTIONS

61. ENTER PASSWORD
0 0 0 0
:L / R : + / -

62. ENTER PASSWORD
F F F 2
:L / R : + / -

63. SERVICE
ECM SUMMARY
1
312C STANDARD

64. INVALID PASSWORD
: RETRY
: EXIT

65. SERVICE
SWITCH STATUS
1
10

66. EXIT
SWITCH STATUS
1
10

67. 00:00
TRVL SPEED AUTO
INSTALL TOOL #1

68. 00:00
TRVL SPEED AUTO
INSTALL TOOL #1

69. MAIN MENU
PREFERENCES
SELECT TOOL
FLTR/FLUID INFO

70. PREFERENCE MENU
SELECT LANGUAGE
ADJUST CLOCK
DISPLAY ADJ

71. :H / M : + / -
ADJUST CLOCK
0 0 0 0

72. SERVICE
ECM SUMMARY
1
312C STANDARD

73. SERVICE
ECM SUMMARY
1
3312C STANDARD

74. SERVICE
SWITCH STATUS
1
10

75. SERVICE
SWITCH STATUS
10
HIGH PRESS

76. SERVICE
STATUS
1
52.5

77. SERVICE
STATUS
11
1948

78. SERVICE
CONFIGURATION
1
320 HYD

79. SERVICE
CONFIGURATION
15
1300

80. SERVICE
CONFIGURATION
39
STANDBY

81. SERVICE
CONFIGURATION
39
CLEAR?

82. SERVICE
ACTIVE ERROR
00 OF 02
TOP

83. SERVICE
ACTIVE ERROR
00 OF 02
TOP

84. SERVICE
ACTIVE ERROR
01 OF 02
69 : 1162 - 04

85. SERVICE
LOGGED ERROR
00 OF 02
TOP

86. SERVICE
LOGGED ERROR
01 OF 05
69 : 190 - 04

87. SERVICE
LOGGED ERROR
00 OF 02
69 : 581 - 04

88. SERVICE
LOGGED ERROR
02 OF 05
CLEAR?

89. SERVICE
LOGGED EVENT
00 OF 05
TOP

90. SERVICE
LOGGED EVENT
01 OF 05
69 : 600

91. SERVICE
LOGGED EVENT
01 OF 05
69 : 600

92. SERVICE
LOGGED ERROR
01 OF 05
CLEAR?