320B U EXCAVATOR ELECTRICAL SCHEMATIC AKASHI USED IN SERVICE MANUAL SENR9240

©
2000 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR3725
February 2000
320 BU Excavator
Electrical System
BBG1-UP
7ZZ1-UP
8GZ1-UP
Machine
Location
Components
Schematic
Location
Machine
Location
Components
Schematic
Location
1C
A/C Switch - Panel
H-5 18D
Relay - Fan
I-7
1
Actuator - Governor
A-9 1D
Relay - Horn
I-7
2
Air Heater
C-9 9D
Relay - Heater
F-7
3
Alternator
B-8 6D
Relay - Main
G-7
4
Antenna
C-6 7D
Relay - Neutral Start
F-7
12
Alarm - Travel
G-9 14D
Relay - Start Cont
E-8
5
Battery
H-8 15D
Relay - Starter
F-8
13D
Block - Terminal
F-8 4D
Relay - Hydraulic Lock Solenoid
I-7
11D
Breaker - Alt
I-8 8D
Relay - Timer
E-7
19D
Breaker - Main
I-8 10D
Resistor - Backup
I-7
6
Controller
F-2 31
Seat With Seat Heater
F-4
27
Converter
H-3 14
Sender - Engine Coolant Temp
C-9
30
Converter - 12V 5A
H-6 3E
Sender - Hydraulic Oil Temp
A-8
3B
Dial - Engine Speed
E-3 5A
Sensor - A/C Photo
F-1
4C
Fuse - Block
1-4,5, 6 13
Sensor - AiH Coolant Temp
C-9
7
Horn
B-2 2E
Sensor - Fuel Level
A-8
8
Lamp - Boom
A-1, B-1 15
Sensor - Pump Discharge Press
B-8
9
Lamp - Cab
G-1 16
Sensor - Speed
C-8
10
Lamp - Chassis
A-2 17
Solenoid - Air Cond Comp Clutch
C-9
8A
Lamp - Dome
B-5 18
Solenoid - Crush
A-5
2A
Lighter - Cigar
E-1 3G
Solenoid - Hydraulic Lock
I-1
3A
Meter - Service
F-1 1F
Solenoid - Level Finish
A-4
1A
Monitor
F-1 19
Solenoid - Swing Brake
D-7
11
Motor - Starter
B-9 2F
Solenoid - Travel Speed
A-4
17D
Motor - Washer
I-9 3F
Solenoid - Trenching
A-4
6A
Motor - Wiper
E-1 20
Speaker
C-6
2D
Relay - Boom Lamp
I-7 21
Switch - Air Cleaner
H-9
3D
Relay - Chassis/Cab Lamp
I-7 1G
Switch - Aux Hydraulic Press
H-1
16D
Relay - Demolition
E-8 7B
Switch - Backup
D-5
Machine
Location
Components
Schematic
Location
Machine
Location
Components
Schematic
Location
22
Switch - Boom Raise Press
A-5
4B
Switch - One Touch Low Idle
F-3
23
Switch - Coolant Level
H-9
1B
Switch - Panel
F-3
4G
Switch - Crush Press 1
I-1
5B
Switch - Seat Heater
D-4
5G
Switch - Crush Press 2
H-1
6B
Switch - Speed Change
D-5
12D
Switch - Disconnect
I-8
2B
Switch - Starter
F-3
24
Switch - Engine Oil Level
B-9
28
Switch - Travel Press
A-5
25
Switch - Engine Oil Press
B-9
4A
Switch - Window Limit
D-1
2G
Switch - Hammer Press
H-1
2C
Radio
I-3
3C
Switch - Horn
I-1
29
Unit - Air Conditioner
H-5
1E
Switch - Hydraulic Oil Level
A-8
5D
Unit - Heater Control
H-7
26
Switch - Implement Swing Press
A-5
4F
Valve - Proportional Reducing
A-4
5C
Switch - Neutral Start
I-1
7A
Wiper Control
E-1
Area A = Inside of cab
Area B = Inside of R.H. console
Area C = Inside of L.H. console
Area D = Around relay panel
Area E = Around hydraulic oil tank
Area F = Around pilot manifold
Area G = Bottom platform
COMPONENT LOCATION CHART
COMPONENT LOCATION CHART
Title Form No.
Engine/Pump Control SENR9291
Starting and Charging RENR1007
Related Service Manuals
Resistor, Sender and Solenoid Specifications
Part No. Component Description Resistance (Ohms)¹
4I-5394 Sender: Hydraulic Oil Temperature 20824-25451 @ 0 °C (32 °F)
6134-7496 @ 25 °C (77 °F)
3989-4875 @ 35 °C (95 °F)
2224-2718 @ 50 °C (122 °F)
973-1189 @ 75 °C (167 °F)
475-522 @ 100 °C (212 °F)
221-269 @ 125 °C (257 °F)
102-8016 Resistor: Backup 47.0 ± 2.35
111-9916 Solenoid: Eng/Pump Cont 11.7 ± 1.2
121-1490 Solenoid: Level Finish 32.0 ± 3.2
Trenching
121-1491 Solenoid: Hydraulic Lock
Swing Brake 32.0 ± 3.2
Travel Speed
¹ At room temperature.
Code Description of Problems
1301 Engine oil pressure is too low.
1302 Engine coolant temperature is too high.
1303 Hydraulic oil temperature is too high.
1304 Air filter is clogged.
1305 Battery voltage is not normal.
2201 Governor actuator feedback sensor circuit is open or shorted to battery voltage.
2202 Governor actuator feedback sensor circuit is shorted to body ground.
2301 Governor actuator feedback signal is not stable.
2302 Governor actuator feedback signal deviates.
2303 Governor actuator does not move.
2304 Calibration data error.
3201 Monitor RAM is not normal.
4101 Electric power supply to the controller is too much (43 volts).
4102 Over-current in proportional reducing valve.
4103 Proportional reducing valve circuit is open.
4104 Monitor power supply (digital output) over current.
4105 Over-current in digital output (trenching solenoid).
4106 Over-current in digital output (fine control solenoid).
4107 Over-current in digital output (travel speed change solenoid).
4108 Over-current in digital output (travel alarm).
4109 Spare solenoid 1 (digital output) over current.
410A Over-current in digital output (swing brake solenoid).
410b Spare solenoid 2 (digital output) over current.
4201 Engine speed is not normal.
4202 Engine coolant temperature sensor is shorted to body ground.
4203 Hydraulic oil temperature sensor is shorted to body ground.
4204 PWM sensor of pump delivery pressure is shorted to body ground.
4205 Spare PWM sensor 1 is shorted to body ground.
4206 Spare PWM sensor 2 is shorted to body ground.
4207 PWM sensor of pump delivery pressure is open in circuit.
420A Fuel sensor is shorted to body ground
420B Fuel sensor is open or shorted to battery voltage.
420C Electric power supply is to low (below 23 volts).
420D Electric power supply is to high (above 32 volts).
420E Engine speed dial is not in one of the 10 specified positions.
4301 Data mismatch 1 between alternator and speed sensor (alternator is abnormal).
4302 Data mismatch 2 between alternator and speed sensor (speed sensor is abnormal).
4303 Engine stalls.
A201 Monitor communication is not normal.
A202 Monitor takes too much time to respond to controller's signal.
A203 Communication is abnormal in controller.
A20d ADEM communication disconnect.
Real Time Error Codes
Off Machine Switch Specification
Part No. Function Actuate Deactuate Contact Position
106-0179 Implement Pressure 1520.0 ± 98.00 kPa 1127.0 kPa MIN Normally Open
Travel Pressure (224.4 ± 14.21 psi) (163.5 psi MIN)
106-0180 Boom Raise Pressure 2646.00 ± 196.00 kPa 2156.00 ± 196.00 kPa Normally Open
(383.77 ± 28.43 psi) (312.70 ± 28.43 psi)
Boom Raise Pressure (attachment)
Crush Pressure 1 (attachment) 490.00 ± 49.00 kPa 290.00 kPa MIN Normally Open
106-0181 Crush Pressure 2 (attachment) (71.07 ± 7.11 psi) (42.06 psi MIN)
Hammer Pressure (attachment)
Aux. Hydraulic Pressure (attachment)
¹ A hysteresis band exists: with increasing pressure the closed condition can be maintained up to 3340 kpa (405 psi), with decreasing pressure the closed
condition can be maintained down to 180 kpa (25 psi).
² Contact position at the contacts of the harness connector.
Connectors
Connector No. And
Machine Location
Harness And/or
Components
Schematic
Location
Connectors
Connector No. And
Machine Location
Harness And/or
Components
Schematic
Location
CONN1 A - 183 - 0996
Controller
D-2
CONN38
G
A-183-0996
M-111 - 4841,V-150-7026
H-4,3
CONN2 A - 183 - 0996
Controller
F-2
CONN42
C
V - 150- 7026
Radio Tuner
H-3
13 Contacts
CONN14
D - 153 - 2555
Wiper Control
E-1
CONN68
D
C - 153- 2496
Heater Control Unit
H-7
CONN3
A - 183 - 0996
A - 183 - 0996
C-2 7, Contacts
CONN15
A
D-153-2555
Monitor
F1
CONN20 A - 183 - 0996
G - 150 - 6999
F-4
CONN5
G
A-183-0996
A-183-0996
C-2
CONN21
G
A - 183 - 0996
G - 150 - 6999
F-4
CONN7
A
A - 183- 0996
E-111-4795
C-6
CONN33
G
A-183-0996
H - 153 - 2491
H-5
CONN31
B
G-150-6999
Engine Speed Dial
E-3
CONN37
G
A - 183 - 0996
H - 153 - 2491
H-4
CONN35
G
A - 183 - 0996
H - 153 - 2491
H-5
CONN53
D
A - 183 - 0996
B - 170 - 6861
F-9
CONN40 V - 150 - 7026
W - 150 - 7022
H-3
CONN54
D
A - 183 - 0996
B - 170 - 6861
F-8
CONN43 A - 183 - 0996
A/C Unit
G-5
CONN55
D
A - 183 - 0996
B - 170 - 6861
G-8
CONN82 B - 170 - 6861
Governor Actuator
A-9
CONN58
D
B - 170 - 6861
C - 153 - 2496
F-8
CONN83
D
C - 153 - 2496
Start Cont Relay
E-8
CONN59
D
A - 183 - 0996
C - 153 - 2496
G-8
CONN13
A
D - 153 - 2555
Wiper Motor
E-1
CONN60
D
A - 183 - 0996
C - 153 - 2496
G-8
CONN25
B
G - 150 - 6999 D-4
CONN61
D
A - 183 - 0996
C - 153 - 2496
G-8
CONN26
B
G - 150- 6999
TT - 116 - 0237
D-4
CONN10
E - 111 - 4795 C-6
CONN27
B
G - 150 - 6999 D-5
CONN32
B
G - 150 - 6999
Switch Panel
F-3
CONN28
B
G - 150 - 6999 D-3
CONN39
C
M - 111 - 4841
Radio Tuner
I-3
CONN29
B
G - 150 - 6999
Seat Heater SW
D-4
CONN4
G
A - 183 - 0996
A - 183 - 0996
C-2
CONN30
B
G - 150 - 6999 D-3
CONN6
A
A - 183 - 0996
E-111-4795
C-6
CONN34
B
G - 150 - 6999 D-3
CONN8
A
A - 183 - 0996
D - 153 - 2555
C-5
CONN69
D
C - 153 - 2496 I-7
CONN9
A
A - 183 - 0996
D - 153 - 2555
C-5
CONN22
G
A - 183 - 0996
G - 150 - 6999
F-5
CONN17
G
A - 183 - 0996
G - 150 - 6999
F-5
CONN23
G
A - 183 - 0996
G - 150 - 6999
F-4
CONN18
G
A - 183 - 0996
G - 150 - 6999
F-5
CONN63
D
C - 153 - 2496
Timer Relay
E-7
CONN36
G
A - 183 - 0996
H - 153 - 2491
H-4 3 Contacts
CONN11 E - 111 - 4795
Speaker
C-6
CONN12 E - 111 - 4795
Speaker
C-6
CONN79 B - 170 - 6861
Boom Raise Press Switch
B 5
CONN52
C
H - 153 - 2491
Neutral Start Switch
I-1
CONN80 B - 170 - 6861
Implement Swing Press Switch
A-5
CONN71 B - 170 - 6861
Coolant Level Switch
H-9
CONN81 B - 170 - 6861
Travel Press Switch
A-5
CONN90
B - 170 - 6861
Pump Discharge Press
Sensor
B-8
CONN84 B - 170 - 6861
Speed Sensor
C-8
CONN16
A
D - 153 - 2555
A/C Photo Sensor
F-1
CONN85 R - 161 - 3130
Crush Sol.
A-5
CONN19 B - 170 - 6861
K - 161 - 3088
A-3
CONN86 B - 170 - 6861
A/C Clutch Solenoid
C-9
CONN24 G - 150 - 6999
Seat With Seat Heater
F-4
CONN87 B - 170 - 6861
AiH Coolant Temp Sensor
C-9
CONN41
G
A - 183 - 0996
H - 153- 2491
H-5
CONN88
D
P - 132 - 1865
R - 161 - 3130
H-8
CONN44 D - 153 - 2555
A/C Unit
G-6
CONN89 B - 170 - 6861
Engine Oil Level Switch
B-9
CONN45 A - 183 - 0996
U - 116 - 0258
H-6
CONN91
F
B - 170 - 6861
Level Finish Solenoid
A-4
CONN47
G
A - 183 - 0996
Hammer Press Switch
H-1
CONN92
F
B - 170 - 6861
Travel Speed Solenoid
A-4
CONN48
G
A - 183 - 0996
Auxiliary Hydraulic Press
Switch
H-1
CONN93
F
B - 170 - 6861
Trenching Solenoid
A-4
CONN49 B - 170 - 6861
Travel Alarm
G-9
CONN94
F
B - 170 - 6861
Proportional Reducing Valve
A-4
CONN50 B - 170 - 6861
T - 167- 3595
B-2
CONN95 R - 161 - 3130
Boom Raise Press SW
A-5
CONN51
G
A - 183 - 0996
Hydraulic Lock Solenoid
I-1
CONN96
E
B - 170 - 6861
Hydraulic Oil Level Switch
A-7
CONN56
D
A - 183 - 0996
R - 161 - 3130
G-8
CONN97 B - 170 - 6861
J - 161 - 3089
B-2
CONN57
D
A - 183 - 0996 G-8
CONN98
E
B - 170 - 6861
Fuel Level Sensor
A-7
CONN62
D
C - 153 - 2496
TimerRelay
E-7
CONN46 U - 116 - 0258
12V-5ASocket
H-6
CONN64
D
C - 153 - 2496
Start Relay
F-8
CONN72 B - 170 - 6861
Engine Oil Press SW
B 9
CONN65
G
P - 132 - 1865
Crush Press SW1
I-1
CONN74
A
D - 153 - 2555
Cigar Lighter
F-1
CONN66
G
P - 132 - 1865
Crush Press SW2
H 1
CONN75
B
G - 150 - 6999
Low Idle Switch
F-3
CONN67
D
C - 153 - 2496
Diode
H-7
CONN77
C
H - 153 - 2491
Horn Switch
I-1
CONN70
D
R - 161 - 3130
S - 132 - 1867
E-8
CONN78 B -170 - 6861
Air Cleaner Switch
G-9
CONN73 B - 170 - 6861
RR - 153 - 2492
H-9
CONN99
A
E -111 - 4795
L -116 - 0243
G-1
CONN76 B - 170 - 6861
Swing Brake Solenoid
D-7
CONN100
A
E - 111 - 4795
L - 116 - 0243
G-1
3 Contacts
2 Contacts
2 Contacts
Bullet
Terminal
8 Contacts
8 Contacts
6 Contacts
5 Contacts
4 Contacts
HARNESS CONNECTOR LOCATION CHART
40 Contacts
12 Contacts
9 Contacts
A
1
2
3
4 5
6
7
8
9
10
11
12
13
14
15
16
3
4
5
6
8
9
10
11
12
14
15
13
16
B
C
D
E
1
2
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
7
F
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
3
4
5
6
9
8
10
11
12
14
15
13
16
B
C
D
E
1
2
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
9
8
7
F
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
20
G
Machine Harness And Connector Locations
7
G
G
1
2
5
7
1
4
13
10
15
16
12
11
10
8
9
3
4
4
8
9
7
6
5
2
11
12
1
14
16
3
6
26
18
5
29
6
3
27
28
15
14
13
3
6
16
17
5
17
7
9
14
2
1
1
9
8
6
12
30
4
8
4
4
1
2
7
3
8
9
18
19
20
2
11
10
13
15
17
18
19
20
7
21
1
2
3
4
22
1
23
2
31
25
2
5
3
24
10
11
A
G
10
1
2
3
4
5
6
7
8
9
10
11
Area A
1
2
3
4
5
6
7
8
9
10
Area B
3
4
5
6
1
2
7
3
4
5
6
8
1
2
7
Area C
Area D
1
2
3
4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18
17
3
4
5
1
2
3
4
5
6
8
9
10
11
12
14
15
13
16
1
2
17
18
19
7
1
2
2
1
4
3
2
1
Area E
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
20
3
4
5
1
2
3
4
1
2
3
1
2
306-GN-18
2
1
309-GY-18
322-GY-18
304-WH-8
877-YL-4
101-RD-4
109-RD-6
F774-WH-18
F773-OR-18
A761-PU-18
K904-GN-18
430-BU-18
K906-GN-18
A771-PU-18
763-BU-18
A769-GY-18
491-PK-18
496-WH-18
495-GN-18
403-GN-18
788-YL-18
A762-PU-18
C468-BU-18
405-GY-18
492-GY-18
519-PK-18
412-BU-18
112-PU-6
K909-BU-18
A587-YL-18
A588-GN-18
151-GN-18
791-PK-18
786-GN-18
114-RD-18
A770-PK-18
200-BK
954-GN-18
954-GN-18
200-BK-18
235-BK-14
200-BK-14
A587-YL-18
506-PU-18
403-GN-18
A771-PU-18
788-YL-18
A762-PU-18
763-BU-18
412-BU-18
C468-BU-18
405-GY-18
492-GY-18
491-PK-18
495-GN-18
430-BU-18
496-WH-18
K904-GN-18
A761-PU-18
235-BK-14
200-BK-14
786-GN-18
791-PK-18
K906-GN-18
A768-BU-18
A769-GY-18
A770-PK-18
F774-WH-18
F773-OR-18
K909-BU-18
A588-GN-18
A588-GN-18
151-GN-18
129-BU-18
191-WH-14
103-RD-18
103-RD-18
512-GN-18
511-BR-18
509-WH-18
508-PU-18
519-PK-18
113-OR-18
185-YL-18
512-GN-18
511-BR-18
508-PU-18
509-WH-18
519-PK-18
124-GN-14
103-RD-18
113-OR-18
185-YL-18
129-BU-18
124-GN-14
200-BK-14
519-PK-18
200-BK-18
200-BK-18
200-BK-18
590-GY-18
501-GN-18
A586-OR-18
786-GN-18
791-PK-18
113-OR-18
308-YL-18
307-OR-18
A758-BR-18
A757-GY-18
A756-BU-18
A755-PK-18
576-PK-18
575-YL-18
578-BU-18
A590-BU-18
A589-OR-18
K915-GN-18
586-BR-18
310-PU-18
A769-GY-18
A768-BU-18
K906-GN-18
185-YL-18
K909-BU-18
K907-BU-18
A770-PK-18
F772-WH-18
F774-WH-18
F773-OR-18
F771-OR-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
530-OR-18
530-OR-18
501-GN-18
A586-OR-18
105-RD-14
K909-BU-18
191-WH-18
191-WH-18
308-YL-18
147-PU
147-PU-18
L969-WH-18
L968-OR-18
L973-GN-18
L972-BU-18
147-PU-18
A586-OR-18
530-OR-18
114-RD-18
151-GN-18
114-RD-18
112-PU-14
112-PU-14
112-PU-14
124-GN-14
200-BK-18
103-RD-18
A755-PK-18
A756-BU-18
A757-GY-18
114-RD-18
A758-BR-18
151-GN-18
L972-BU-18
112-PU-14
112-PU-14
112-PU-14
112-PU-14
112-PU-14
191-WH-14
Y/W
Y/G
B
A589-OR-18
A590-BU-18
308-YL-18
F771-OR-18
F772-WH-18
L969-WH-18
L968-OR-18
K915-GN-18
K907-BU-18
152-BU
152-BU
200-BK
K909-BU-18
A587-YL-18
A588-GN-18
151-GN-18
308-YL-18
307-OR-18
191-WH
791-PK-18
615-YL
RELAY PANEL
786-GN-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
308-YL-18
A718-PU-18
616-BU
149-PU
786-GN-18
322-GY-18
A587-YL-18
A588-GN-18
151-GN-18
200-BK-18
200-BK-18
200-BK-18
607-PK-18
615-YL
791-PK-18
A770-PK-18
200-BK-18
200-BK-18
149-PU
200-BK-18
K909-BU-18
307-OR-18
200-BK-18
K909-BU-18
200-BK-18
306-GN-18
306-GN-18
310-PU-18
200-BK-18
200-BK-18
147-PU
A537-PK-18
2
1
200-BK-18
586-BR-18
576-PK-18
575-YL-18
F773-OR-18
F774-WH-18
A770-PK-18
A769-GY-18
A768-BU-18
K906-GN-18
615-YL-18
L973-GN-18
578-BU-18
307-OR-18
308-YL-18
791-PK-18
786-GN-18
185-YL-18
105-RD-14
113-OR-18
501-GN-18
590-GY-18
152-BU
200-BK-18
191-WH
K909-BU-18
200-BK-18
K909-BU-18
307-OR-18
200-BK-18
A537-PK-18
200-BK-18
112-PU-14
112-PU-14
200-BK-18
200-BK-18
200-BK-14
200-BK-18
L969-WH-18
200-BK-18
A770-PK-18
L968-OR-18
200-BK-18
K909-BU-18
A770-PK-18
791-PK-18
615-YL
607-PK-18
200-BK-18
151-GN-18
A588-GN-18
A587-YL-18
322-GY-18
786-GN-18
149-PU
616-BU
A718-PU-18
306-GN-18
310-PU-18
200-BK-18
308-YL-18
200-BK-18
200-BK-18
200-BK-18
615-YL
607-PK-18
791-PK-18
200-BK-18
151-GN-18
200-BK-18
A588-GN-18
A590-BU-18
A589-OR-18
616-BU
149-PU
322-GY-18
11
12
1
2
3
4
5
6
7
8
9
10
200-BK-18
200-BK-18
615-YL-18
615-YL-18
A587-YL-18
200-BK-18
BK
WH
K909-BU-18
8
615-YL-18
9
6
A770-PK-18
5
12
11
615-YL-18
575-YL-18
4
10
10
9
8
12
7
576-PK-18
6
11
578-BU-18
L973-GN-18
5
152-BU-18
2
1
4
3
2
200-BK-18
200-BK-18
K907-BU-18
200-BK-18
200-BK-18
1
615-YL-18
615-YL-18
586-BR-18
147-PU
L975-PK-18
K909-BU-18
177-RD-6
109-RD-6
101-RD-6101-RD-6
115-PK-14
615-YL-18
200-BK-18
K909-BU-18
200-BK-18
114-RD-18
114-RD-18
150-RD-18
115-PK-14
150-RD-18
K909-BU-18
786-GN-18
308-YL-18
308-YL-18
200-BK-18
FAN RELAY
149-5050
ALT
BREAKER
9S-0174
WW
BACKUP
RESISTOR
102-8016
HYD LOCK SOL RELAY
149-5050
CAB/CHASSIS LAMP RELAY
149-5050
60A
HORN RELAY
149-5050
BOOM LAMP RELAY
149-5050
KEY SW.(ON)
HEATER
CONT UNIT
104-3204
VV
CHECK TERM.
RELAY
KEY SW.(START)
GND
REGULATOR
TEMP.
YYSS
SS
MAIN
BREAKER
9S-0174
200-BK-18
200-BK-18
175-RD-14
200-BK-18
185-YL-18
K909-BU-18
326-RD
200-BK-18
326-RD
K915-GN-18
615-YL-18
615-YL-18
F771-OR-18
F773-OR-18
F774-WH-18
F772-WH-18
615-YL-18
A769-GY-18
152-BU-18
615-YL-18
3
A768-BU-18
K906-GN-18
615-YL-18
185-YL-18
L909-BU
310-PU-18
L908-OR
615-YL-18
615-YL-18
200-BK-18
191-WH
185-YL-18
7
A758-BR-18
307-OR-18
A757-GY-18
A756-BU-18
A755-PK-18
T
308-YL-18
5
4
3
2
1
308-YL-18
200-BK-18
AIH COOLANT
TEMP SENSOR
125-2982
B
2
1
AIR CLEANER SW
109-9330
PUMP DISCHARGE
PRESS. SENSOR
106-0178
SIGNAL
GROUND
+BATTERY
BK-18
BR-18
YL-18
B
C
AIR HEATER
5I-7746
B
GND
F/B
+B
ACCEL
B
B
1
2
DECEL
6
ENG GOV
ACTUATOR
157-3157
BB
B
B
B
KEY
ENG OIL
LEVEL SW
111-4760
2
1
2
1
L972-BU-18
B
200-BK-18
COOLANT
LEVEL SW
096-0744
200-BK-18
MOTOR
113-OR-18
B
BATMTR
SG
791-PK-18
786-GN-18
STARTER
MOTOR
125-2988
WASHER
7T-8890
2
1
590-GY-18
ENG SPEED
PICKUP
125-2966
105-RD-14
BATTERY
3T-5760
9X-3404 (NOTE A)
POS
NEGNEG
POS
A
6
A/C CLUTCH
SOL
154-0490
MOTOR
326-RD
W. INT (6)
(NOTE B)
A A
7
8
1
60A
6
5
4
3
2
G G
6
8
1
7
4
5
3
2
ATCH
SEAT WITH
SEAT HEATER
111-6458
12
1
10
8
11
12
9
10
11
4
3
2
1
9
8
2
7
6
5
4
3
2
1
4
5
6
1
7
3
3
GG
AA
G
2
A
G
4
A
L41
L42
L42
L10
L10
L908-OR
L9
L9
L8
L8
G
L13
L13
L12
L12
L11
L11
L41
L41
L41
L42
L42
GG
L33 L33
L33
L33
L33
G
TT
G GGGG
BACKUP
EPR VALVE SW
114-0421
G G
BACKUP
GOV SW
110-7884 ATCH SEAT
HEATER SW
111-4783
G
L11
L12
G
G
ONE TOUCH
LOW IDLE SW
128-2134
+B
L. CHASSIS
L. BOOM
WASH
W. LOW
W. INT (3)
GND
L13
L13
L13
L12
L12
CONNECTOR
L11
L11
L10
L10
L9
L9
L8
L8
S4
S3
S2
S1
COM
(NOTE B)
G
SWITCH PANEL
153-2500
KEY SW
9G-7641
G
THROTTLE
POS SW
106-0107
R
C
S
114-RD-18
B
OFF
ON
ST
140-BU
149-PU
147-PU-18
107-RD
103-RD-18
114-RD-18
ELECTRICAL CONNECTION
191-WH-14
307-OR-18
115-PK-14
120-YL
118-GY
124-GN-14
129-BU-18
L909-BU
L908-OR
177-RD-14
177-RD-14
185-YL18
196-BU
200-BK-18
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
177-RD-14
CIRCUIT NOT CONNECTED
ATCH WIRE, CABLE,
COMPONENT
L
200-BK
#
151-GN-18
A770-PK-18
PP
200-BK-18
111-RD-14
308-YL-18
L909-BU
189-RD-14
308-YL-18
112-PU-14
112-PU-14
200-BK-18
308-YL-18
308-YL-18
L975-PK-18
308-YL-18
200-BK-18
310-PU-18
306-GN-18
A718-PU-18
151-GN-18
112-PU-14
185-YL-18
200-BK-18
177-RD-14
308-YL-18
308-YL-18 177-RD-14
308-YL-18
308-YL-18
200-BK-18
112-PU-14
200-BK-18
112-PU-14
112-PU-14
196-BU
140-BU
107-RD
114-RD-18
103-RD-18
168-RD-14
149-PU
235-BK
235-BK
191-WH-14
129-BU-18
PP
200-BK-18
PP
118-GY
124-GN-14
120-YL
308-YL-18
116-BR-14
200-BK-18
116-BR-14
308-YL-18
308-YL-18
ATCH HAMMER
PRESS. SW
106-0181
112-PU-6
A587-YL-18
A588-GN-18
151-GN-18
791-PK-18
308-YL-18
786-GN-18
114-RD-18
A770-PK-18
K909-BU-18
200-BK
235-BK
320-OR-18
320-OR-18
L909-BU
105-RD-14
105-RD-14
172-RD-18
L908-OR
116-BR-14
INT (6)
113-OR-18
105-RD-14
113-OR-18
113-OR-18
113-OR-18
113-OR-18
K909-BU-18
200-BK-18
177-RD-14
177-RD-14
177-RD-14
177-RD-14
235-BK
L LE
168-RD-14
Y/G
Y/W
172-RD-18
196-BU
111-RD-14
168-RD-14
168-RD-10
CIRCUIT GROUPING
DESIGNATION
A718-PU-18
309-GY-18
616-BU
322-GY-18
607-PK-18
DISCONNECT SW.
7N-0718
OUT 1
+B
IN 2
IN 1
GND
OUT 2
UU
VV
WW
JJ
UU
YY
XX
ZZ
5
4
6
1
7
2
12
1
147-PU-18
5
3
4
6
2
1
7
8
9
10
11
12
118-GY
8
2
10
11
3
4
9
TIMER RELAY
111-4870
124-GN-14
7
MAIN RELAY
165-4026
6
XX
5
4
5
NEUTRAL
START RELAY
149-5050
START RELAY
125-1302
6
3
12
2
1
7
11
8
9
10
DIODE
121-1022
JJ KK
185-YL-18
1
3
2
4
HEATER
RELAY
9X-8124
KK
149-PU
321-BR-18
321-BR-18
403-GN-18
321-BR-18
B
321-BR-18
321-BR-18
321-BR-18
321-BR-18
M
200-BK-18
L975-PK-18
L975-PK-18
L975-PK-18
L975-PK-18
200-BK-18
L977-YL-18
L978-GY-18
L974-GN-18
L971-GN-18
R
L971-GN-18
L977-YL-18
L974-GN-18
L978-GY-18
ENG/PUMP CONT
157-3217
1
2
B T
1
2
G975-YL-18
G973-OR-18
G973-OR-18
L38
G974-WH-18
G973-OR-18
147-PU-18
L38
L38
200-BK-18
G973-OR-18
147-PU-18
G974-WH-18
L38
S
R
P
NOTE A: USE WITH COLD WEATHER.
R
G973-OR-18
G975-YL-18
ATCH CRUSH
PRESS. SW2
106-0181
ATCH CRUSH
PRESS. SW1
106-0181
G975-YL-18
G973-OR-18
177-RD-14
177-RD-14
B
177-RD-14
177-RD-14
P
2
1
E
G973-OR-18
G975-YL-18
1
2
P
310-PU-18
310-PU-18
310-PU-18
877-YL-4101-RD-4
177-RD-6
ATCH
HEATER UNIT
139-7258
177-RD-14
A
A
A
A
G973-OR-18
G975-YL-18
A768-BU-18
BK
YL
172-RD-18
B
BA
A
115-PK-14
G973-OR-18
RD-00
G975-YL-18G975-YL-18
G973-OR-18G973-OR-18
B
B
B
B
B
B
B
2
1
177-RD-14
177-RD-14
177-RD-14
B
177-RD-14
177-RD-14
177-RD-14
G975-YL-18
177-RD-14
177-RD-14
177-RD-14
177-RD-14
GROUND STRAP
167-3583
BOOM RAISE
PRESS. SW
106-0180
1
2
B
2
1
2
1
ENG/PUMP CONT
SOL
LEVEL FINISH
SOL
121-1490
ATCH
TRAVEL ALARM
3E-7738
2
1
TRENCHING SOL
121-1490
TRAVEL SPEED
SOL
121-1491
T
B
1
2
HYD OIL
TEMP SENDER
4I-5394
2
1
FUEL LEVEL
SENSOR
105-9911
ENG
2
1
B
2
1
HYD OIL
LEVEL SW
111-4760
SWING
BRAKE SOL
121-1491
IMPLEMENT
PRESS. SW
106-0179
2
TRAVEL
PRESS. SW
106-0179
T
1
A
B
G
G975-YL-18G975-YL-18
G973-OR-18
147-PU-18
P
2
1
1
2
13
12
10
7
6
5
8
11
4
177-RD-14
9
3
LL
200-BK-14
200-BK-14
200-BK-14
12
11
177-RD-14
10
9
177-RD-14
D
8
3
177-RD-14
G973-OR-18
147-PU-18
ATCH
BOOM RAISE
PRESS. SW
106-0181
R/L
R
C537-GN-18
G974-WH-18
147-PU-18
ATCH
CRUSH SOL
127-6845
1
2
R
177-RD-6
L36
L36
L36
L36
2
116-BR-14
A
L909-BU-18
1
A
G975-YL-18
R
235-BK-18
S
1
2G974-WH-18
L908-OR-18
200-BK-18
ATCH DEMOLITION
RELAY
149-5050
G973-OR-18
200-BK-18
G975-YL-18
116-BR-14
200-BK-18
112-PU-14
112-PU-14
180-GN
189-RD-14
113-OR-18
129-BU-18
140-BU
168-RD-10
107-RD
103-RD-18
114-RD-18
177-RD-14
A
115-PK-14147-PU-18
120-YL
403-GN-18
191-WH-14
175-RD-14
J703-PK-18
175-RD-14
175-RD-14
200-BK-18
177-RD-14
309-GY-18
309-GY-18
330-YL-18
403-GN-18
J703-PK-18
177-RD-14
175-RD-14
SS
116-BR-14
147-PU
6
1
3
R
BR
A/C UNIT
159-7855
4
5
2
147-PU
152-BU
152-BU
ATCH HEATER
SWITCH PANEL
139-7261
A/C SWITCH
PANEL
139-7207
PLATFORMCHASSIS
GROUND STRAP
7G-1060
ATCH
ANTENNA CABLE
111-4846
A
175-RD-14
200-BK-14
C538-OR-18
147-PU
K905-RD-14
150-RD-18
512-GN-18
150-RD-18
235-BK-18
L909-BU-18
L908-OR-18
150-RD-18
116-BR-14
116-BR-14
150-RD-18
150-RD-18
154-RD-18
115-PK-14
150-RD-18
154-RD-18
172-RD-18
177-RD-14177-RD-10
152-BU
176-YL
K905-RD-14
K905-RD-14
H
A
3
7
9
1
11
403-GN-18
5
H
A
2
1
2
1
4
3
5
6
A
H
12
11
10
6
1
177-RD-14
3
5
2
7
511-BR-18
8
9
4
H
A
RADIO
FLOW CONT SOL
12
4
10
2
6
509-WH-18
508-PU-18
200-BK-18
103-RD-18
615-YL-18
113-OR-18
8
FAN
INSP LAMP
10A
15A
10A
10A
10A
10A
ENG GOV
15A
PWR WINDOW
308-YL-18
CAB/CHASSIS LAMP
CONVERTER
103-RD-18
403-GN-18
191-WH-14
103-RD-18
103-RD-18
191-WH-14
403-GN-18
403-GN-18
191-WH-14
103-RD-18
103-RD-18
191-WH-14
403-GN-18
K997-BU-18
K912-GN-18
K911-PK-18
403-GN-18
506-PU-18
A587-YL-18
LOWER WASHER/WIPER
WASHER/WIPER
200-BK-14
200-BK-14
530-OR-18
615-YL-14
615-YL-14
A589-OR-14
A590-BU-14
590-GY-18
501-GN-18
VV
CIGAR LIGHTER
A586-OR-18
191-WH-14
508-PU-18
A/C /HEATER
10A
509-WH-18
511-BR-18
512-GN-18
118-GY-14
129-BU-18
103-RD-18
530-OR-18
K911-PK-18
K912-GN-18
A586-OR-18
590-GY-18
501-GN-18
K997-BU-18
200-BK-14
103-RD-18
118-GY-14
129-BU-18
615-YL-14
506-PU-18
403-GN-18
A583-YL-18
A584-BU-18
A584-BU-18
HORN
A583-YL-18
A589-OR-14
FUSE
10A 9W-1442
15A 9W-1441
20A 9W-1446
30A 8T-9636
BACKUP
15A
DOME LAMP
KEY SW
REFUELING PUMP
BOOM LAMP
FINE SWING SOL
10A
10A
30A
10A
10A
10A
10A10A
10A
ATCH SPEAKER(R)
7Y-5505
20A
10A
10A
10A
15A
E/P CONT
HYD LOCK SOL
10A
SHUTDOWN
AUX CKT
AUX CKT
SW PANEL
HYD LOCK SW
HH
H
H
H
H
FUSE BASE
111-4812
A
H
8
L29
L29
L29
L29
L29
L29
C537-GN-18
C538-OR-18
615-YL-14
403-GN-18
129-BU
ATCH SPEAKER(L)
7Y-5505
103-RD-18
590-GY-18
K912-GN-18
K911-PK-18
K997-BU-18
200-BK-14
530-OR-18
501-GN-18
A586-OR-18
A583-YL-18
A584-BU-18
506-PU-18
118-GY
512-GN-18
7
508-PU-18
509-WH-18
511-BR-18
103-RD-18
200-BK-14
615-YL
235-BK-18
THROTTLE DIAL S1
THROTTLE DIAL S2
THROTTLE DIAL S3
THROTTLE DIAL S4
GOV ACTR (A)
EPR VALVE (+)
GOV ACTR (B)
GOV ACTR FDBK
COOLANT LEVEL SW
TRAVEL SPEED SOL
ENG SPEED SENSOR (-)
ENG SPEED SENSOR (+)
TRENCHING SOL
IMPLEMENT PRESS. SW
ENG OIL LEVEL SW
FUEL LEVEL SENSOR
FRONT PUMP PRESS. SENSOR
HYD OIL LEVEL SW
AIR CLEANER SENSOR
HYD OIL TEMP SENDER
RS485 - (VALVE CONT)
RS485 + (VALVE CONT)
RS232C (GND)
RS232C (RXD)
COOLANT SENDER
9
20
10
28
31
26
13
30
29
35
40
2
6
39
6
24
25
22
15
ALTERNATOR (P TERM)
RS485 - (RH JOYSTICK)
7
38
12
TRAVEL ALARM
ENG OIL PRESS. SW
36
SWING BRAKE SOL
23
EPR VALVE (-)
17
21
8
RS485 + (LH JOYSTICK)
7
CAB
8
RS485 - (LH JOYSTICK)
RS485 + (PEDAL)
9
10
RS485 + (SEMI AUTO)
RS485 - (PEDAL)
RS485 + (RADIO CONT)
17
HYD TANK PRESS. SW
RS485 - (SEMI AUTO)
RS485 + (RH JOYSTICK)
27
18 TRAVEL PRESS. SW
18
RS485 - (RADIO CONT)
RS485 + (ELEC GOV)
19
+B
+B
FINE SWING SW
BOOM RAISE PRESS. SW
LEVEL FINISH SOL
DUAL PWR SOL
AUX HYD PRESS. SW
32
33
25
KEY SW ON
RS485 - (ELEC GOV)
26
12
40
2
4
28
27
LOW IDLE SW
21
20
1
11
22
34
3
24
23
14
13
16
15
5
36
35
29
31
30
39
38
37
GND
GND
HAMMER PRESS. SW
RS232C (TXD)
KEY SW START
A
DOME LAMP
096-0721
2
3
4
5
6
1
8
7
37
4
3
OPTION SENSOR (PWM)
OPTION SENSOR (PWM) 1
16
19
5
OPTION SENSOR (PWM)
12
32
33
14
11
34
2
1
8
3
5
4
7
6
7
8
9
10
1
11
7
6
5
4
3
8
1
2
5
2
1
4
3
6
E
E
E
E
E
E D D
A A A
6
5
4
3
2
L909-BU-18
L6
L7
ATCH
ANTENNA
106-0036
177-RD-14
PLATFORM
A
1
6
2
5
3
4
2
3
4
5
6
1
8
7
E
JOYSTICK +B OUT
L908-OR-18
L972-BU-18
308-YL-18
RD-00
A
CHASSIS
A758-BR-18
CC
BK-00
A757-GY-18
BB
A756-BU-18
AA
L15
A755-PK-18
K912-GN-18
K911-PK-18
B
B
115-PK-14
189-RD
154-RD-18
111-RD-14
150-RD-18
K997-BU-18
189-RD
154-RD-18
111-RD-14
150-RD-18
BB
235-BK-18
BLOCK
121-1023
235-BK-18
B
K905-RD-18
K905-RD-18
A
K915-GN-18
954-GN-18
L15
L26
403-GN-18
L975-PK-18
RELAY PANEL
L909-BU-18
235-BK-18
200-BK-18
L15
C
F771-OR-18
C
CA
A
F772-WH-18
L31
L32
189-RD
154-RD-18
111-RD-14
150-RD-18
K907-BU-18
L908-OR-18
115-PK-14
L968-OR-18
115-PK-14
J703-PK-18
150-RD-18
114-RD-18
154-RD-18
189-RD
111-RD-14
K909-BU-18
L969-WH-18
A718-PU-18
116-BR-14
403-GN-18
D
L971-GN-18
L970-GY-18
C
A761-PU-18
K904-GN-18
L32
L32
496-WH-18
430-BU-18
495-GN-18
491-PK-18
J703-PK-18
111-RD-14
189-RD
154-RD-18
154-RD-18
189-RD
177-RD-14
111-RD-14
308-YL-18
RELAY PANEL
L31
L31
A
B
B
B
B
CB
492-GY-18
405-GY-18
L16
C468-BU-18
L23
321-BR-18
L23
L23
L23
L26
L26
L16
412-BU-18
763-BU-18
A762-PU-18
L27
L27
L28
L28
788-YL-18
L977-YL-18
L30
L30
L974-GN-18
L978-GY-18
L28
L27
A584-BU-18
L30
191-WH-14
A583-YL-18
L28
L27
A587-YL-18
403-GN-18
K911-PK-18
K912-GN-18
5
K997-BU-18
K997-BU-18
4
K997-BU-18
K997-BU-18
K997-BU-18
L970-GY-18
L909-BU-18
954-GN-18
L971-GN-18
L908-OR-18
L975-PK-18
200-BK-18
235-BK-18
235-BK-18
235-BK-14
235-BK-18
A761-PU-18
K904-GN-18
496-WH-18
430-BU-18
495-GN-18
491-PK-18
492-GY-18
405-GY-18
C468-BU-18
412-BU-18
763-BU-18
A762-PU-18
788-YL-18
L977-YL-18
L974-GN-18
L978-GY-18
K905-RD-14
K905-RD-18
K905-RD-18
L969-WH-18
L968-OR-18
K907-BU-18
F772-WH-18
A771-PU-18
A590-BU-14
A589-OR-14
6
RD-00
RD-00
F771-OR-18
A755-PK-18
615-YL-14
A756-BU-18
A590-BU-14
A589-OR-14
590-GY-18
A757-GY-18
501-GN-18
A586-OR-18
200-BK-14
200-BK
200-BK-18
A758-BR-18
308-YL-18
200-BK-18
530-OR-18
118-GY
200-BK-18
200-BK-18
L972-BU-18
200-BK-18
200-BK-18
322-GY-18
322-GY-18
K915-GN-18
322-GY-18
322-GY-18
200-BK-14
616-BU-14
200-BK
200-BK
200-BK-14
616-BU-14
616-BU
616-BU
506-PU-18
501-GN-18
200-BK-18
506-PU-18
430-BU-18
200-BK-18
200-BK-18
200-BK-18 200-BK-18
412-BU-18
513-OR-18
519-PK-18
308-YL
307-OR
307-OR
307-OR
308-YL
308-YL
506-PU-18
200-BK-18
200-BK-14
200-BK-14
200-BK-18
200-BK-18
616-BU-14
322-GY-18
200-BK-14
200-BK-18
607-PK-14
200-BK-18
200-BK-18
322-GY-18
616-BU-14
200-BK-18
430-BU-18
506-PU-18
200-BK-18
200-BK-6
412-BU-18
519-PK-18
1
2
200-BK-18
405-GY-18
200-BK-6
492-GY-18
A718-PU-18
513-OR-18
308-YL
F774 WH-18
F773-OR-18
A761-PU-18
172-RD-18
200-BK-18
RD-00
101-RD-4
304-WH-8
177-RD-14
C468-BU-18
C468-BU-18
200-BK-18
200-BK-18
200-BK-18
309-GY-18
J703-PK-18
109-RD-6
403-GN-18
A762-PU-18
788-YL-18
877-YL-4
200-BK-18
200-BK-18
172-RD-18
A761-PU-18
F773-OR-18
F774-WH-18
513-OR-18
308-YL
405-GY-18
788-YL-18
A762-PU-18
C468-BU-18
101-RD-4
304-WH-8
492-GY-18
403-GN-18
109-RD-6
J703-PK-18
309-GY-18
A718-PU-18
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF.
JJ
GROUND STRAP
132-1805
CC
BB
AA
CABLE AS.
YY
WIRE AS.
200-BK-18
172-RD-18
A761-PU-18
F773-OR-18
F774 WH-18
308-YL
513-OR-18
A718-PU-18
492-GY-18
200-BK-6
405-GY-18
200-BK-18
200-BK-18
200-BK-18
763-BU-18
L977-YL-18
607-PK-14
616-BU-14
L
K
J
H
G
F
E
D
C
B
1
2
GY
PU
BR
RED
WHITE
ORANGE
YELLOW
PINK
ABBREV COLOR
BLACK
GRAY
PURPLE
BROWN
DESCRIPTIONSYMBOL
BLADE, SPADE, RING,
OR SCREW TERMINAL
BK
PK
YL
OR
WH
RD
GN
BU
GREEN
BLUE
CIRCUIT CONNECTED
IDENT PART NO. LOC
615-YL-14
615-YL-14
616-BU-14
616-BU-14
149-PU-14
118-GY-14
615-YL-14
191-WH-14
530-OR-18
A590-BU-14
200-BK-14
HARNESS AS.
191-WH-14
103-RD-18
L971-GN-18
A771-PU-18
L974-GN-18
K906-GN-18
495-GN-18
607-PK-14
322-GY-18
K
607-PK-14
B
491-PK-18
L977-YL-18
763-BU-18
L978-GY-18
A768-BU-18
A769-GY-18
K904-GN-18
K997-BU-18
A583-YL-18
615-YL-14
200-BK-18
615-YL-14
L973-GN-18
586-BR-18
200-BK-18
615-YL-14
615-YL-14
616-BU-14
615-YL-14
200-BK-18
586-BR-18
J703-PK-18
N
172-RD-18
A761-PU-18
F773-OR-18
320-OR-18
F774-WH-18
C468-BU-18
405-GY-18
788-YL-18
A762-PU-18
C468-BU-18
101-RD-4
304-WH-8
403-GN-18
109-RD-6
309-GY-18
492-GY-18
A718-PU-18
877-YL-4
513-OR-18
513-OR-18
320-OR-18
506-PU-18
519-PK-18
412-BU-18
430-BU-18
320-RD-18
492-GY-18
200-BK-18
116-BR-14
J703-PK-18
A718-PU-18
309-GY-18
149-PU-14
149-PU-14
322-GY-18
304-WH-8
877-YL-4
101-RD-4
109-RD-6
200-BK-6
200-BK-6
200-BK-18
KK
405-GY-18
200-BK-18
330-YL-18
200-BK-18
309-GY-18
J703-PK-18
403-GN-18
308-YL-18
308-YL-18
308-YL-18
308-YL-18
SIS CONNECTOR
309-GY-18
200-BK-18
320-OR-18
A718-PU-18
200-BK-18
3
L37
L27
B
CHASSIS
WH/GN
WH/YL
513-OR-18
615-YL-14
AA
L37
L37
B
CHASSIS
L30
5
4
3
2
1
L40
L43
L43
L44
L44
L17
L17
L17
L40
L39
L39
L43
L44
L44
330-YL-18
112-PU-14
112-PU-14
L28
120-YL
200-BK
200-BK
120-YL
320-OR-18
320-RD-18
L15
B
120-YL
200-BK
135-BU
120-YL
WH/BU
GND
200-BK
615-YL-14
WW
200-BK
START CONT RELAY
094-2080
120-YL
200-BK
115-PK-14
172-RD-18
154-RD-18
150-RD-18
111-RD-14
K905-RD-14
L22
L21
L21
189-RD
YL
L973-GN-18
105-RD
200-BK
XX
L18
L18
D
L34
L34
L34
L34
L35
L35
L20
L19
L3
L4
L25
L25
L4
A
TT
607-PK-14
L20
L19
L3
L25
L4
L35
200-BK-18
L4
L25
L3
L19
L20
L20
L4
L4
L3
L3
L19
L20
L25
L25
200-BK-14
L2
200-BK-14
512-GN-18
511-BR-18
607-PK-14
200-BK-18
616-BU-14
L46
L45
L35
L35
L46
L46
L45
L45
RD-00
200-BK-18
200-BK-18
200-BK-18
200-BK-18
L978-GY-18
E
A
L6
L7
763-BU-18
L977-YL-18
BK
A769-GY-18
200-BK-18
L974-GN-18
A771-PU-18
A584-BU-18
L971-GN-18
R
P
322-GY-18
607-PK-14
A768-BU-18
S
L
ZZ
509-WH-18
200-BK-18
L971-GN-18
200-BK-18
A771-PU-18
L977-YL-18
763-BU-18
L978-GY-18
A768-BU-18
A769-GY-18
200-BK-18A769-GY-18
L5
A768-BU-18
322-GY-18
200-BK-18
L974-GN-18
115-PK-14
200-BK-18
200-BK-18
200-BK-14
200-BK-18
200-BK-18
118-GY-14
615-YL-14
615-YL-14
491-PK-18
496-WH-18
200-BK-18
K906-GN-18
320-RD-18
2
K906-GN-18
(NOTE F)
1
320-RD-18
200-BK
A
200-BK-18
1
2
149-PU-14
149-PU-14
A
A
A586-OR-18
508-PU-18
1
615-YL
2
A
590-GY-18
A584-BU-18
200-BK
129-BU
615-YL
E
200-BK
615-YL
403-GN-18
200-BK
U
200-BK-18
200-BK-18
200-BK-18
491-PK-18
496-WH-18
615-YL-18
200-BK-18
495-GN-18
112-PU-6
K904-GN-18
K997-BU-18
200-BK-18
495-GN-18
K997-BU-18
K904-GN-18
4
607-PK-14
6
3
U
ATCH
12V 5A
SOCKET
121-0987
200-BK
320-RD-18
ATCH 12V 5A
CONVERTER
119-1733
2
5
1
12V MEMORY
24V MEMORY
24V IN
112-PU-6
SW INPUT
OPTION SENSOR (PWM)
200-BK
200-BK-18
A584-BU-18
201-BK-18
308-YL
200-BK-14
308-YL
308-YL
200-BK-18
200-BK-18
954-GN-18
L970-GY-18
200-BK-18
A588-GN-18
200-BK-18
615-YL-14
GND
GND
K912-GN-18
115-PK-14
111-RD-14
113-OR-18
103-RD-18
615-YL
103-RD-18
12V OUT
200-BK-18
200-BK-18
ATCH
CAB LAMP
153-2521
200-BK-18
K997-BU-18
K911-PK-18
200-BK
C537-GN-18
304-WH-8
C538-OR-18
200-BK
150-RD-18
L47
L47
L47
L47
L43
C
B
A
105-RD
615-YL
W
V
320-RD-18
200-BK
L978-GY-18
200-BK
154-RD-18
189-RD
172-RD-18
L22
K905-RD-14
L22
111-RD-14
150-RD-18
200-BK
200-BK-14
200-BK-18
A579-OR
B
151-GN-18
B
B
B
B
519-PK-18
200-BK-18
BB
508-PU-18
509-WH-18
ALTERNATOR
5I-8085
511-BR-18
512-GN-18
T
COOLANT TEMP
SENDER
5I-7578
8
L
E
B
309-GY-18
200-BK-18
A580-BR
A581-GN
P
OPERATOR STATION
A582-PU
6
7
R
200-BK-18
200-BK-18
ALT
150-RD-18
B
154-RD-18
B
4
2
112-PU-6
200-BK-18
200-BK
5
1
200-BK-14
ENG OIL
PRESS. SW
5I-8005
3
200-BK-14
M
A771-PU-18
200-BK
A584-BU-18
200-BK-18
200-BK
A584-BU-18
L24
L24
200-BK-18
L24
M
ZZ
SPEAKER (+)
954-GN-18
L970-GY-18
A588-GN-18
ATCH RADIO
309-GY-18
L970-GY-18
306-GN-18
200-BK-14
177-RD-8
L970-GY-18
W
112-PU-6
W
V
L970-GY-18
177-RD-8
615-YL
200-BK
V
V
ATCH
CONVERTER
134-1346
TO RADIO
ATCH RADIO CONVERTER
512-GN-18
954-GN-18
509-WH-18
511-BR-18
508-PU-18
A513-RD-18
8
6
7
4
2
113-OR-18
5
1
3
592-BU-18
GND
IGN
592-BU-18
A513-RD-18
200-BK-18
12V
MEM
200-BK-18
24V
200-BK-18
615-YL-14
113-OR-18
103-RD-18
508-PU-18
200-BK-18
113-OR-18
103-RD-18
511-BR-18
306-GN-18
6
4
2
5
1
3
A
154-RD-18
306-GN-18
1
2
615-YL-14
T
(NOTE B)(NOTE B)
(NOTE B)
(NOTE B)
(NOTE B)
(NOTE B)
2
1
496-WH-18
189-RD
ANTENNA
172-RD-18
L21
200-BK-18
L20
L5
509-WH-18
512-GN-188
7
L6
D
CAB
H
PLATFORM
A587-YL-18
D
D
D
+
1
2
L19
3
4
H
HYD
LOCK SOL
121-1491
L15
L17
5
147-PU
6
147-PU
GND
LIGHT
RS485-
+B
MAIN
RS485+
W. CCW
W. CW
REV
STOP
GND
WASH
ACC
WA+
LOW
WIPER CUT
RISE. S
INT (3)
SPEAKER (-)
BACK UP
WIPER
MOTOR
122-9603
GND
WIPER CONT
155-7042
NEUTRAL START
LIMIT SW
111-4799
HORN SW
128-2134
L15
L975-PK-18
K997-BU-18
147-PU
A
L20
L21
L19
L3
L18
L3
L18
K
147-PU
147-PU
147-PU
147-PU
147-PU
L47
RR
D
A591-PU-18
L7
615-YL
RR
L14
L14
L1
A
D
L7 L7
B
NOTE C: USE WITH A/C UNIT.
B
L1
WINDOW
LIMIT SW
124-3974
E
T
ATCH
BOOM LAMP
153-2521
CHASSIS
OPERATOR STATION
513-OR-18
U
F
ATCH
CAB LAMP
111-4813
153-2521
SPEAKER (+)
200-BK-18
HORN
7Y-3919
A
LL
ACC (+)
F
J
J
513-OR-18
200-BK-18
309-GY-18
200-BK
106-0172
200-BK
L2
L2
A/C PHOTO
SENSOR
128-2162
(NOTE C)
2
1
-
ILLUMI (+)
UU
I-3
I-3
E-8
E-8
H-9
B-2
H-3
I-8
F-8
F-8
I-8
I-8
A-9
I-8
G-1
A-3
B-2
H-4
D-3
A-1
G-1
D-1
F-8
A-3
H-3
F-8
F-8
F-8
D-4
F-8
C-2
H-3
H-3
H-9
H-6
F-8
111-4846
111-4841
132-1867
161-3130
132-1865
167-3595
153-2504
128-8936
111-4831
116-0233
161-3077
116-0080
161-3076
128-8937
116-0243
161-3088
161-3089
153-2491
150-6999
7Y-8216
111-4795
153-2555
153-2496
170-6861
153-2499
116-0234
111-4830
111-4829
116-0237
128-8938
183-0996
150-7022
150-7026
153-2492
116-0258
111-4826
L39
SERVICE
METER
6T-7337
877-YL-4
CHASSIS
LAMP
153-2523
SPEAKER (-)
ATCH
BOOM LAMP
153-2521
MOTOR
DD
DD
EE
K997-BU-18
ATCH
AM/FM RADIO
153-2445
CIGAR
LIGHTER
9W-0335
2
1
ATCH
AUX HYD
PRESS. SW
106-0181
A
L7
HORN
7Y-3920
L6
E96202
THIS SCHEMATIC IS FOR THE 320BU-HYD EXCAVATOR (170-9477 CHG 00)
TO MACHINE STRUCTURE
NOTE B: NOT USE ON THIS MACHINE.
UNLESS OTHERWISE SPECIFIED ALL WIRE IS 16 GAUGE.
INDICATOR
LUBRICATOR
HYD TANK INDICATOR
HYD OIL FILTER INDICATOR
AIH INDICATOR
CONN
82
CONN
90
CONN 89
CONN 84
CONN 87
CONN 86
CONN 83
CONN 64
CONN
58
CONN 53
CONN 54
CONN 55
CONN 59
CONN 60
CONN 61
CONN 56
CONN 57
CONN
73
CONN
71
CONN 88
CONN 98
CONN 96
CONN 10
CONN 76
CONN 12
CONN 11
CONN 6 CONN 7
CONN 8
CONN 9
CONN 62
CONN 63
CONN
67
CONN
44
CONN
43
CONN 68
CONN 95
CONN 85
CONN 81
CONN 80
CONN 79
CONN 91
CONN 92
CONN 93
CONN 94
111-9916
CONN 17
CONN 18
CONN 22
CONN 20
CONN 21
CONN 13
CONN 24
CONN 75
CONN 32
CONN 31
CONN 15
CONN 74
CONN 14
CONN 13
CONN 2
CONN 16
CONN 1
CONN 3
CONN 4
CONN 5
CONN 52
CONN 77
CONN 65
CONN 48
CONN 47
CONN 66
CONN 99
CONN 100
CONN 51
CONN 52
CONN 42
CONN 40
CONN 38
CONN 38
CONN 39
CONN 33
CONN 35
CONN 41
CONN 36 CONN 37
CONN 28 CONN 30 CONN 34
CONN 29
CONN 26
CONN 19
CONN 50
CONN 97
CONN 27
CONN 25
CONN
69
CONN
46
CONN
45
CONN
49
CONN 70
CONN 72
CONN
78
MONITOR +B OUT
RS485 + (MONITOR)
RS485 - (MONITOR)
MONITOR
9 8 7 6 5 4 3 2 1
9 8 7 6 5 4 3 2 1
H
G
I
F
E
D
C
B
A
H
G
I
F
E
D
C
B
A
STARTING CIRCUIT.
GAUGE CIRCUIT.
MONITOR CIRCUIT.
WASHER/WIPER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
ENGINE / PUMP CONTROL CIRCUIT.
AIR INLET CIRCUIT.
ALL DASHED LINES ARE ATTACHMENTS.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS OFF.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS ON.
Wire Description
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
Power Distribution Circuits Accessory Circuits (continued)
101 RD Bat (+) 576 PK Wiper - Aux
103 RD Aux Ckt 578 BU Washer - Aux
105 RD Key Start Sw 586 BR Aux Hydraulic - Close
107 RD Eng Shut - Down 590 GY Wiper Sw To Intermittent Module
109 RD Alt Output (+) Term. 592 BU DC/DC Converter Power Output
111 RD Aux Ckt A537 PK Seat Heater
112 PU Main Power Rly Output A579 OR Wiper Motor +
113 OR Opr Mon Panel B (+) Switched A580 BR Wiper Motor -
114 GN Warning Horn (Forward) A581 GN Wiper Motor Raise
115 PK Aux Ckt A582 PU Wiper Motor Stop
116 BR Aux Ckt A583 YL Power Window Interlock To Wiper Cont
118 GY Aux Ckt A584 BU Front Window Limit SW To Wiper Cont
120 YL Aux Ckt A586 OR Wiper SW To Wiper Cont
124 GN A/C A587 YL Power Window Cont To Safety Sol Relay
129 BU Aux Ckt A588 GN Safety Sol Relay To Sol
135 BU Aux Ckt A589 OR Power Window Up
140 BU Aux Ckt A590 BU Power Window Down
147 PU Aux Ckt A591 PU Rear Window Limit SW
149 PU Aux Ckt C537 GN A/C Photo Sensor + Sig
150 RD Bat (+) C538 OR A/C Photo Sensor - Sig
151 GN Aux Ckt Lighting Circuits
152 BU Aux Ckt 607 PK Flood Lamps - Front
154 RD Aux Ckt 615 YL Cab Flood Lamp/Rops
168 RD Aux Ckt 616 BU Boom Flood Lamp
172 RD Aux Ckt Control Circuits
175 PK Aux Ckt 763 BU Torque Converter Sw
176 YL Aux Ckt 786 RD Engine Speed Cont
177 RD Main Brkr 788 YL Engine Speed (+)
180 GN Aux Ckt 791 PK Eng Speed Cont - Lo Sol
185 YL Aux Ckt A718 PU Start Aid Coolant Sensor Signal
189 RD Aux Ckt A755 PK Throttle Sw #1
191 WH Aux Ckt A756 BU Throttle Sw #2
196 BU Aux Ckt A757 GY Throttle Sw #3
Ground Circuits A758 BR Throttle Sw #4
200 BK Main Chassis A761 PU Electronic Pump Cont Throttle Ground
201 BK Operator Monitor Return A762 PU Elec Pump Cont Eng Speed Ground
235 BK Electronic Pump Ctrl Gnd A768 BU Pump Control Valve #1 (+)
Basic Machine Circuits A769 GY Pump Control Valve #2 (-)
304 WH Starter Relay No. 1 Output A770 PK Elec Pump Cont Bypass Sw
306 GN Starter Relay Coil To Neut Start SW Or A771 PU Float Sw
307 OR Key Start SW To Neutral Start SW Or F771 OR Backup SW
308 YL Main Power Relay Coil F772 WH Backup SW
309 GY Alternator Regulator Term. F773 OR Governor Accel
310 PU Start Aid SW To Start Aid Sol F774 WH Governor Decel
320 RD Horn Relay Coil To Sw J703 PK Alt Pulse Sig To Anti-Start Relay
320 OR Horn Relay Coil To SW 877 YL Glow Plug Magnetic SW To Glow Plug
321 BR Backup Alarm Lamp Travel Alarm 954 GN Hammer Sw A
322 GY Warning Horn (Forward) G973 OR Boom Raise Press SW to Crush Press SW
326 RD Key SW "C" Term G974 WH Crush Sol to Demolition Relay
330 YL Neutral Start Relay Coil G975 YL Crush Press SW to Demolition Relay
Monitoring Circuits K904 GN Pump Discharge - Signal
403 GN Alternator (R) Term. K905 RD Pump Discharge - +B
405 GY Opr Mon Oil Press. (Low Setting) K906 GN Swing Brake Sol - Signal
412 BU Operator Monitor Cool Flow K907 BU Swing Brake Sol - +B
430 BU Operator Monitor Air Filter K909 BU Backup SW - +B
491 PK Hydraulic Oil Temp Sensor K911 PK E/P Controller - RS485 (+)
492 GY VMIS Coolant Temp Sensor Signal K912 GN E/P Controller - RS485 (-)
495 GN Fuel Level K915 GN Fine Swing Sw - E/P Controller
496 WH Operator Monitor Panel Hyd Oil Level K997 BU (+) V Sensor
C468 BU Engine oIl Level L908 OR Controller RS-232C TX
Accessory Circuits L909 BU Controller RS-232C RX
501 GN Wiper - Front (Low) L968 OR Electronic Pump COntrol Ps Valve (-)
506 PU Washer - Front L969 WH Electronic Pump Control Ps Valve (+)
508 PU Radio Speaker - Left L970 GY Elec Pump Cont To Sw Common Ret
509 WH Radio Speaker - Left (Common) L971 GN Elec Pump Cont To Travel Press Sw
511 BR Radio Speaker - Right L972 BU Low Idle SW
512 GN Radio Speaker - Right (Common) L973 GN Fine Swing Cont Relay To Sol Valve
513 OR A/C Compressor/Refrigerant Pressure SW L974 GN Elec Pump Ctrl Boom Raise Press SW
519 PK Thermostat To Refrigerant Press. SW L975 PK Start Aid Cont Lamp 1 Output
530 OR Washer Right L977 YL Trenching Sol
575 YL Wiper - Aux L978 GY Level Finish Sol
A AA
1
2
325-PK-14
200-BK-14
T
This indicates that the component does not have a wire connected to ground. It is
grounded by being fastened to the machine.
This indicates that the component has a wire connected to it that is connected to ground.
105-9344
T
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
Pin
Socket
Fuse
Component
Part Number
Pin or Socket
Number
Receptacle
Plug
Wire Gauge
Wire, Cable, or Harness
Assembly Identification
Wire Color
Normally closed switch that will open with an increase of a specific condition.
No circle indicates that the wire cannot be disconnected from the component.
Single Wire
Connector
Circuit Number
Identification
Ground
Connection
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Circuit Breaker
Symbol
Reed Switch - A switch whose contacts are controlled by a magnet. A magnet closes the
contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.
Sender- A component that is used with a temperature or pressure gauge. The sender
measures the temperature or pressure. Its resistance changes to give an indication to
the gauge of the temperature or pressure.
Relay (Magnetic Switch) - A relay is an electrical component that is activated by electricity.
It has a coil that makes an electromagnet when current flows through it. The
electromagnet can open or close the switch part of the relay.
Solenoid - A solenoid is an electrical component that is activated by electricity. It has a
coil that makes an electromagnet when current flows through it. The electromagnet
can open or close a valve or move a piece of metal that can do work.
Harness And Wire Symbols
Electrical Schematic Symbols And Definitions
1
1
2
2
Typical representation of a Sure-Seal
connector. The plug and receptacle
contain both pins and sockets.
Typical representation of a Deutsch
connector. The plug contains all
sockets and the receptacle contains
all pins.