318B MACHINE ELECTRICAL SCHEMATIC AKASHI USED IN SERVICE MANUAL RENR1950

©
1999 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR2923
July 1999
318B L & 318B LN Excavator
Electrical System
3LR1-UP
7KZ 1-UP
Connectors
Connector
No. And
Machine
Location
Harness And/Or Components
Schematic
Location
Connectors
Connector
No. And
Machine
Location
Harness And/Or Components
Schematic
Location
CONN 1 A - 150 - 7013 CONN 38 A - 150 - 7013
Controller P - 111 - 4841, V - 150 - 7026
CONN 2 A - 150 - 7013 CONN 41 C - 170 - 6876
Controller Air Heater Control Unit
CONN 14 D - 153 - 2555 CONN 68 C - 170 - 6876
Wiper Control Heater Control Unit
CONN 3
A - 150 - 7013 CONN 101 V - 150 - 7026
A - 150 - 7013 Radio
CONN 17 A - 150 - 7013 CONN 15 A - 150 - 7013
G - 150 - 7014 Monitor
CONN 19 A - 150 - 7013 CONN 5 A - 150 - 7013
G - 150 - 7014 A - 150 - 7013
CONN 35 A - 150 - 7013 CONN 7 A - 150 - 7013
H - 153 - 2454 E - 150 - 6989
CONN 37 A - 150 - 7013 CONN 31 G - 150 - 7014
H - 153 - 2454 Engine Speed Dial
CONN 53 A - 150 - 7013 CONN 36 A - 150 - 7013
B - 170 - 6873 H - 153 - 2454
CONN 55 A - 150 - 7013 CONN 40 T - 150 - 7022
B - 170 - 6873 V - 150 - 7026
CONN 58 B - 170 - 6873 CONN 43 A - 150 - 7013
C - 170 - 6876 A/C Unit
CONN 60 A - 150 - 7013 CONN 46 X - 116 - 0258
C - 170 - 6876 12V 5A Converter
CONN 61 A - 150 - 7013 CONN 54 A - 150 - 7013
C - 170 - 6876 B - 170 - 6873
CONN 10 E - 150 - 6989 CONN 59 A - 150 - 7013
Power Window Control C - 170 - 6876
CONN 32 G - 150 - 7014 CONN 82 A - 150 - 7013
Switch Panel Governor Actuator
CONN 39 P - 111 - 4841 CONN 83 C - 170 - 6876
Radio Start Cont Relay
CONN 4 A - 150 - 7013 CONN 13 D - 153 - 2555
A - 150 - 7013 Wiper Motor
CONN 6 A - 150 - 7013 CONN 27 G - 150 - 7014
E - 150 - 6989 Seat Heater Switch
CONN 8 A - 150 - 7013 CONN 28 G - 150 - 7014
D - 153 - 2555 Power Window Switch
CONN 9 A - 150 - 7013 CONN 29 G - 150 - 7014
D - 153 - 2555 Lower Washer Switch
CONN 18 A - 150 - 7013 CONN 30 G - 150 - 7014
G - 150 - 7014 Lower Wiper Switch
CONN 20 A - 150 - 7013 CONN 49 C - 170 - 6876
G - 150 - 7014
E-4
E-4
H-9
H-4
J-8
E-2
E-5
E-5
H-5
D-8
G-8
D-9
E-3
H-4
H-3
H-5
7 Contacts
6 Contacts
5 Contacts
H-3
H-6
J-8
J-2
F-2
B-5
B-6
8 Contacts
B-5
B-6
B-6
B-5
E-6
E-6
G-8
G-9
9 Contacts
A-6
E-3
J-3
13 Contacts E-2
12 Contacts
C-5
F-6
E-6
H-5
D-7
D-8
G-7
Harness Connector Location Chart
40 Contacts
A-4
C-4
8 Contacts
Connectors
Connector
No. And
Machine
Location
Harness And/Or Components
Schematic
Location
Connectors
Connector
No. And
Machine
Location
Harness And/Or Components
Schematic
Location
CONN 50 A - 150 - 7013 CONN 47 A - 150 - 7013
Lower Wiper Motor Hammer Press Switch
CONN 63 C - 170 - 6876 CONN 48 A - 150 - 7013
Timer Relay Auxiliary Hydraulic Press Switch
CONN 99 C - 170 - 6876 CONN 51 A - 150 - 7013
Engine Shutdown Timer Hydraulic Lock Solenoid
CONN 11 E - 150 - 6989 CONN 56 A - 150 - 7013
Speaker
CONN 12 E - 150 - 6989 CONN 62 C - 170 - 6876
Speaker Timer Relay
CONN 25 B - 170 - 6873 CONN 64 C - 170 - 6876
Hydraulic Oil Filter Indicator Start Relay
CONN 52 H - 153 - 2454 CONN 65 B - 170 - 6873
Neutral Start Switch MM - 132 - 1827
CONN 71 A - 150 - 7013 CONN 67 C - 170 - 6876
Coolant Level Switch Diode
CONN 85 A - 150 - 7013 CONN 69 B - 170 - 6873
A - 150 - 7013 Travel Alarm.
CONN 90 B - 170 - 6873 CONN 70 A - 150 - 7013
Pump Discharge Press Sensor Auto Lubricator Pump
CONN 95 B - 170 - 6873 CONN 73 A - 150 - 7013
N - 167 - 3496
CONN 16 D - 153 - 2555 CONN 76 B - 170 - 6873
A/C Photo Sensor Swing Brake Solenoid
CONN 21 A - 150 - 7013 CONN 79 B - 170 - 6873
Lower Washer Motor Boom Raise Press Switch
CONN 22 A - 150 - 7013 CONN 80 B - 170 - 6873
Washer Motor Implement Swing Press Switch
CONN 23 G - 150 - 7014 CONN 81 B - 170 - 6873
Seat With Seat Heater Travel Press Switch
CONN 24 N - 167 - 3496 CONN 84 B - 170 - 6873
R - 116 - 0096 Speed Sensor
CONN 26 B - 170 - 6873 CONN 86 B - 170 - 6873
Proportional Reducing Valve A/C Clutch Solenoid
CONN 33 A - 150 - 7013 CONN 87 B - 170 - 6873
H - 153 - 2454 AiH Coolant Temp Sensor
CONN 34 A - 150 - 7013 CONN 88 B - 170 - 6873
H - 153 - 2454 J - 145 - 0573
CONN 42 C - 170 - 6876 CONN 89 B - 170 - 6873
Air Heater Relay Engine Oil Level Switch
CONN 44 G - 150 - 7014 CONN 91 B - 170 - 6873
A/C Unit Level Finish Solenoid
CONN 45 A - 150 - 7013 CONN 92 B - 170 - 6873
X - 116 - 0258 Travel Speed Solenoid
A-7
C-9
C-2
A-9
A-7
C-7
B-7
B-9
B-9
E-9
E-9
A-3
C-7
2
Contacts
G-2
G-2
G-2
D-8
J-7
H-7
A-3
H-7
D-9
H-5
G-6
H-6
H-5
F-5
B-2
A-7
H-5
B-2
E-2
F-9
F-9
H-2
E-9
C-5
A-7
Harness Connector Location Chart
4
Contacts
3
Contacts
2
Contacts
G-2
J-7
H-7
B-6
A-6
B-7
Related Electrical Service Manuals
Title Form Number
Engine/Pump Control RENR1998
Starting And Charging RENR1044
Connectors
Connector
No. And
Machine
Location
Harness And/Or Components
Schematic
Location
Connectors
Connector
No. And
Machine
Location
Harness And/Or Components
Schematic
Location
CONN 93 B - 170 - 6873 CONN 66 A -150 - 7013
Trenching Solenoid Air Cleaner Switch
CONN 94 N - 167 - 3496 CONN 72 E - 150 - 6989
Refueling Pump L - 116 - 0243
CONN 96 B - 170 - 6873 CONN 74 E -150 - 6989
Hydraulic Oil Level Switch L - 116 - 0243
CONN 97 N - 167 - 3496 CONN 75 H -153 - 2454
S - 116 - 0098 Horn Switch
CONN 98 B - 170 - 6873 CONN 77 G - 150 - 7014
Fuel Level Sensor Low Idle Switch
CONN 100 C -170 - 6876 CONN 78 D - 153 - 2555
Diode Cigar Lighter
CONN 57 B - 170 - 6873
Engine Oil Press Switch
B-8
D-8
G-1
H-1
H-2
F-3
F-2
Harness Connector Location Chart
Bullet
Terminal
2 Contacts
Bullet
Terminal
A-7
B-2
B-7
B-3
A-2
H-7
Machine
Location
Component
Schematic
Machine
Location
Component
Schematic
21D Actuator - Governor D-9 1G Motor - Lower Wiper G-2
1C A/C Switch Panel H-5 14 Motor - Starter B-8
3 Air Heater B-9 1 Motor - Washer F-9
3 Alarm - Travel D-9 6A Motor - Wiper. E-2
4 Alternator C-8 15 Power Window Control B-6
5 Antenna A-6 16 Pump - Auto Lubrication E-9
6 Battery E-9, F-9 17 Pump - Refueling B-2
13D Block - Terminal G-8 2C Radio J-3
11D Breaker 1 G-9 2H Relay - Air Heater G-6
19D Breaker 1 - Bat G-9 2D Relay - Boom Lamp J-9
17D Breaker 2 H-9 3D Relay - Chassis/Cab Lamp J-9
22D Breaker 2 - Bat H-9 20D Relay - Fan J-7
16D Breaker 3 H-9 1D Relay - Horn J-9
7 Controller C-4 9D Relay - Heater H-7
8 Converter J-3 6D Relay - Main H-7
9 Converter - 12V 5A H-5 7D Relay - Neutral Start J-7
3B Dial - Engine Speed E-3 14D Relay - Start Cont J-7
4C Fuse - Block J-4, 5, 6 15D Relay - Starter H-7
2 Glow Plug B-9 4D Relay - Hydraulic Lock Solenoid J-9
10 Horn C-2 19 Relay - Refueling 1 B-2
2E Indicator-Hydraulic Oil Filter B-7 20 Relay - Refueling 2 B-2
11 Lamp - Boom C-1 8D Relay - Timer J-7
12 Lamp - Cab H-1, G-1 10D Resistor - Backup J-9
13 Lamp - Chassis B-2 28 Seat With Seat Heater F-5
9A Lamp - Dome A-6 5A Sensor - A/C Photo E-3
2A Lighter - Cigar F-2 21 Sensor - AiH Coolant Temp C-8
3A Meter - Service F-2 22 Sender - Engine Coolant Temp C-8
1A Monitor F-2 23 Sensor - Fuel Level A-2
40 Motor - Lower Washer F-9 3E Sender - Hydraulic Oil Temp B-7
Component Location Chart
Machine
Location
Component
Schematic
Machine
Location
Component
Schematic
Location
24 Sensor - Pump Discharge Press A-7 7B Switch - Lower Washer D-4
25 Sensor - Speed B-8 8B Switch - Lower Wiper D-4
26 Solenoid - Air Cond Comp Clutch B-8 5C Switch - Neutral Start H-2
27 Solenoid - Engine Shutdown A-9 4B Switch - One Touch Low Idle F-3
2G Solenoid - Hydraulic Lock H-2 1B Switch - Panel F-3
1F Solenoid - Level Finish A-7 6B Switch - Power Window D-4
32 Solenoid - Swing Brake A-2 8A Switch - Power Window Limit A-6, G-2
2F Solenoid - Travel Speed A-7 41 Switch - Refueling Level A-2
3F Solenoid - Trenching A-7 29 Switch - Refueling Start B-2
33 Speaker B-6 30 Switch - Refueling Stop B-3
35 Switch - Air Cleaner D-9 5B Switch - Seat Heater D-5
4G Switch - Aux Hydraulic Press G-2 10B Switch - Speed Change D-5
9B Switch - Backup D-4 2B Switch - Starter E-3
34 Switch - Boom Raise Press C-7 31 Switch - Travel Press B-7
36 Switch - Coolant Level E-9 4A Switch -Window Limit G-2
12D Switch - Disconnect G-9 18D Timer-Engine Shutdown H-7
37 Switch - Engine Oil Level A-9 18 Unit - Air Conditioner H-5
38 Switch - Engine Oil Press B-8 1H Unit - Air Heater Control H-6
3G Switch - Hammer Press G-2 5D Unit - Heater Control J-8
3C Switch - Horn H-1 4F Valve - Proportional Reducing A-7
1E Switch - Hydraulic Oil Level B-7 7A Wiper Control E-2
39 Switch - Implement Swing Press C-7
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
Area H = Around relay panel
Component Location Chart
Real Time Error Codes
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 Govenor Actuator Feedback Sensor Circuit Is Open Or Shorted Battery Voltage
2202 Govenor Actuator Feedback Sensor Circuit Is Shorted To Body Ground
2301 Govenor Actuator Feedback Signal Is Not Stable
2302 Govenor Actuator Feedback Signal Deviates
2303 Govenor Actuator Does Not Move
2304 Calibration Data Error
3201 Monitor RAM Is Not Normal
4101 Electric Power Supply To The Controller Is Too Much (43Volts)
4102 Over-Current In The Proportional Reducing Valve
4103 Proprtional Reducing Valve Circuit Is Open
4105 Over-Current In The Digtal Output (Trenching Solenoid)
4106 Over-Current In The Digtal Output (Fine Control Solenoid)
4107 Over-Current In The Digtal Output (Travel Speed Change Solenoid)
4108 Over-Current In The Digtal Output (Travel Alarm)
410A Over-Current In The Digtal Output (Swing Break Solenoid)
4201 Engine Speed Is Not Normal
4202 Engine Coolant Temperature Sensor
4203 Hydraulic Oil Temperature Sensor is Shorted To Body Ground
4204 PWM Sensor Of Pump Delivery Pressure 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 Too Low (Below 23 Volts)
420D Electric Power Supply Is Too High (Above 32 Volts)
420E Engine Speed Dial Is Not One Of The Specified 10
4301 Data Mismatch 1 Between The Alternator And The Speed Sensor (Alternator Is Abnormal)
4302 Data Mismatch 2 Between The Alternator And The Speed Sensor (Speed Sensor Is Abnormal)
4303 Engine Stalls
A201 Monitor Communications Is not normal
A202 Monitor Takes Too Much Time To Respond To The Controller's Signal
A203 Communication Is Abnormal In The Controller
A
1
2
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
32
37
35
33
34
36
38
7
H
39
40
41
10
33
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
A
1
2
33
4
56
7
8
9
10
11 12
13
14
15
16
3
5
6
8
9
10
11
12
14
15
13
16
B
C
D
E
1
2
17
18
19
20
21
22
24
26
27
28
29
30
32
37
35
33
34
36
38
7
G
39
40
41
3
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
F
37
36
35
33
36
35
37
34
F
3
11
12
G
34
31
H
23
4
25
2
3
5
6
7
8
9
10
11
3
4
5
6
8
9
1
2
7
8
1
2
3
4
5
6
3
4
5
6
8
9
10
1
2
7
2
3
4
3
4
5
1
2
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
1
2
17
18
19
20
21
22
7
17
18
1
2
3
1
2
AREA E
AREA D
AREA C
AREA B
AREA A
1
2
5
A
7
G
3
G
1
G
13
G
10
G
14
D
13
D
10
D
8
D
7
D
6
1
B
2
C
6
G
4
G
7
A
6
A
4
G
2
G
7
B
16
D
12
G
1
H
1
D
4
C
1
A
5
G
8
A
2
B
9
G
13
4
7
12
D
9
D
17
D
4
D
4
A
4
B
5
B
6
B
1
C
14
17
16
20
3
A
16
G
2
D
15
D
11
12
2
E
14
G
15
G
8
G
2
H
5
19
9
10
18
32
4
F
11
G
17
G
11
D
3
D
6
D
37
5
D
23
24
26
8
15
21
22
25
27
28
36
29
1
F
2
F
3
F
33
1
E
31
30
18
D
35
34
11
A
10
A
3
C
3
B
2
A
1
4
2
3
5
11
1
2
3
4
7
6
1
2
3
4
2
1
3
12
13
8
9
4
10
17
16
14
15
1
2
2
1
AREA F
AREA G
AREA H
AAA
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.
E89428
11
12
1
2
3
4
5
6
7
8
9
10
12
11
10
9
8
7
6
5
4
3
2
1
3
6
5
4
2
1
140-BU
200-BK
615-YL
615-YL-18
615-YL-18
615-YL-18
172-RD-18
189-RD-14
320-RD-18
154-RD-18
151-GN-18
150-RD-18
103-RD-18
168-RD-14
115-RD-14
149-PU
140-BU
177-RD-10
111-RD-14
615-YL-18
519-PK-18
578-BU-18
K906-GN-18
F773-OR-18
F774-WH-18
A770-PK-18
A769-GY-18
A768-BU-18
791-RD-18
786-GN-18
K909-BU-18
A771-PU-18
L978-GY-18
L974-GN-18
L977-YL-18
K997-BU-18
788-YL-18
A762-PU-18
763-BU-18
412-BU-18
C468-BU-18
321-BR-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
L971-GN-18
L975-PK-18
487-OR-18
615-YL
403-GN-18
506-PU-18
A587-YL-18
A
A
BB
A A
A
L975-PK-18
150-RD-18
111-RD-14
177-RD-10
151-GN-18
149-PU
115-RD-14
103-RD-18
154-RD-18
320-RD-18
786-GN-18
791-RD-18
A770-PK-18
A588-GN-18
A587-YL-18
K909-BU-18
189-RD-14
412-BU-18
519-PK-18
403-GN-18
168-RD-14
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
A768-BU-18
168-RD-18
L971-GN-18
491-PK-18
496-WH-18
A768-BU-18
A769-GY-18
L978-GY-18
763-BU-18
L977-YL-18
K904-GN-18
K997-BU-18
L974-GN-18
A771-PU-18
K904-GN-18
327-PK-14
877-YL-8
405-GY-18
C468-BU-18
513-OR-18
K906-GN-18
309-GY-18
J703-PK-18
A771-PU-18
403-GN-18
109-RD-6
L974-GN-18
304-WH-8
492-GY-18
L978-GY-18
A718-PU-18
101-RD-6 L977-YL-18
A762-PU-18
763-BU-18
K997-BU-18
A
B
MOTOR
506-PU-18
788-YL-18
578-BU-18
513-OR-18
BK/PK
BK
321-BR-18
519-PK-18
200-BK-18
506-PU-18
578-BU-18
513-OR-18
200-BK-18
200-BK-18
412-BU-18
ATCH
TRAVEL ALARM
3E-7738
513-OR-18
B
COOLANT
LEVEL SW
096-0744
MOTOR
513-OR-18
WASHER
7T-8890
ATCH
LOWER WASHER
7T-8890
CC
BB
AA
200-BK-18
412-BU-18
519-PK-18
487-OR-18
140-BU
BATTERY
3T-5760
POS
NEG NEG
POS
L971-GN-18
A
A
ON(KEY)
GROUND
2
1
ATCH AUTO
LUBRICATION PUMP
127-5264
RD-00RD-00BK-00
Y/W
Y/G
B
G
R/L
200-BK
R
BR
120-YL
PLATFORM
PLATFORMCHASSIS
GROUND STRAP
7G-1060
200-BK-18
200-BK
200-BK-18
200-BK-14
519-PK-18
200-BK-14
615-YL-18
103-RD-18
103-RD-18
191-WH-14
191-WH-18
152-BU
152-BU-18
200-BK-18
105-RD
185-YL-18
173-YL-18
129-BU
118-GY
K905-RD
111-RD-14
177-RD-10
140-BU
149-PU
115-RD-14
168-RD-14
103-RD-18
150-RD-18
151-GN-18
154-RD-18
320-RD-18
189-RD-14
172-RD-18
124-RD-14
200-BK
200-BK-18
103-RD-18
615-YL-18
509-WH-18
508-PU-18
511-BR-18
512-GN-18
576-PK-18
152-BU-18
575-YL-18
A588-GN-18
954-GN-18
L970-GY-18
152-BU-18
152-BU
191-WH-18
191-WH-14
103-RD-18
103-RD-18
103-RD-18
512-GN-18
511-BR-18
508-PU-18
509-WH-18
103-RD-18
615-YL-18
200-BK-18
200-BK
172-RD-18
189-RD-14
320-RD-18
154-RD-18
151-GN-18
150-RD-18
169-RD-10
168-RD-14
115-RD-14
149-PU
140-BU
105-RD
124-RD-14
177-RD-10
118-GY
111-RD-14
103-RD-18
K905-RD
191-WH-14
147-PU
152-BU
118-GY
129-BU
200-BK-14
110-RD-14
175-RD-14
519-PK-18
519-PK-18
579-BR-14
6
5
4
3
2
1
175-RD-14
615-YL-18
185-YL-18
120-YL
120-YL
200-BK
200-BK
135-BU
615-YL-18
FUSE
5A 139-5345
10A 9W-1442
15A 9W-1441
20A 9W-1446
111-RD-14
A A
HH
168-RD-14
ENG GOV
200-BK-14
173-YL-18
A
H
H
HH
579-BR-14
154-RD-18
189-RD-14
10
12
11
2
3
4
5
9
8
150-RD-18
10A
10A
15A
20A
15A
5A
15A
10A
191-WH-14
120-YL
DOME LAMP
10A
10A
10A
10A
15A
PWR WINDOW
ACC CONVERTER
189-RD-14
5A
K905-RD
151-GN-18
5A
CIGAR LIGHTER
175-RD-14
115-RD-14
BOOM LAMP
REFUELING PUMP
140-BU
SEAT HEATER
C537-GN-18
110-RD-14
120-YL
149-PU
150-RD-18
124-RD-14
172-RD-18
103-RD-18
191-WH-14
178-GN-10
E/P CONT
5A
A/C /HEATER
154-RD-18
151-GN-18
115-RD-14
CAB/CHASSIS LAMP
LUBRICATOR
175-RD-14
BLOWER
7
6
5A
177-RD-10
124-RD-14
103-RD-18
10A
10A
10A
15A
10A
320-RD-18
200-BK-18
C538-OR-18
200-BK
5A
K905-RD
ATCH A/C UNIT
130-0250
6
1
3
HEATER UNIT
139-7258
4
5
2
1
2
A
X
4
6
3
X
ATCH
12V 5A
SOCKET
121-0987
ATCH 12V 5A
CONVERTER
119-1733
2
5
1
12V MEMORY
24V MEMORY
24V IN
GND
GND
12V OUT
120-YL
G
A
200-BK-18
FUSE BASE
111-4812
150-RD-18
140-BU
129-BU
149-PU
168-RD-14
173-YL-18
172-RD-18
HYD LOCK SOL
147-PU
196-BU
147-PU
ATCH SOL
147-PU
176-YL
AUX CKT
179-BU-10
110-RD-14
TIMER RELAY
WASHER/WIPER
118-GY
LOWER WASHER/WIPER
152-BU
180-GN
AUX CKT
150-RD-18
HYD LOCK SW
579-BR-14
178-GN-10
179-BU-10
179-BU-10
177-RD-10
178-GN-10
H
A
320-RD-18
FFFF
152-BU
110-RD-14
10A
BACKUP
185-YL-18
1
L25
L15
L15
L25
L8
L19
L7
L18
L17
185-YL-18
H
H
H
2
1
512-GN-18
511-BR-18
509-WH-18
508-PU-18
K905-RD
129-BU
103-RD-18
118-GY
103-RD-18
191-WH-14
576-PK-18
575-YL-18
191-WH-18
152-BU
105-RD
200-BK-18
K909-BU-18
A
A
7
8
1
6
5
4
3
2
200-BK-18
200-BK-14
200-BK-14
G
G
12
10
8
11
12
9
10
11
1
9
8
2
7
6
5
4
3
2
1
4
5
6
8
1
7
4
6
5
3
2
7
3
GA
G
235-BK
PLATFORM
A
A755-PK-18
A756-BU-18
A757-GY-18
A758-BR-18
308-YL-18
307-OR-18
105-RD
590-GY-18
501-GN-18
A586-OR-18
590-GY-18
501-GN-18
A586-OR-18
A590-BU-18
A589-OR-18
F771-OR-18
F772-WH-18
L969-WH-18
L968-OR-18
K907-BU-18
A755-PK-18
A756-BU-18
A757-GY-18
A758-BR-18
L972-BU-18
786-GN-18
791-RD-18
200-BK-18
173-YL-18
308-YL-18
185-YL-18
152-BU
615-YL-18
191-WH-18
575-YL-18
A768-BU-18
A769-GY-18
A770-PK-18
F774-WH-18
F773-OR-18
K906-GN-18
578-BU-18
105-RD
113-OR-18
791-RD-18
786-GN-18
576-PK-18
575-YL-18
152-BU-18
578-BU-18
191-WH-18
A590-BU-18
A589-OR-18
A586-OR-18
501-GN-18
590-GY-18
A755-PK-18
A756-BU-18
A757-GY-18
A758-BR-18
105-RD
615-YL-18
307-OR-18
308-YL-18
200-BK-18
200-BK-18
G
200-BK-18
200-BK-18
615-YL-18
F771-OR-18
F773-OR-18
F774-WH-18
F772-WH-18
K909-BU-18
K907-BU-18
A770-PK-18
L969-WH-18
L968-OR-18
200-BK-18
G
A769-GY-18
A768-BU-18
K906-GN-18
185-YL-18
200-BK-18
200-BK-18
576-PK-18
575-YL-18
152-BU-18
200-BK-18
615-YL-18
K909-BU-18
K907-BU-18
200-BK-18
L969-WH-18
A770-PK-18
L968-OR-18
152-BU-18
A769-GY-18
A768-BU-18
A769-GY-18
578-BU-18
A768-BU-18
615-YL-18
615-YL-18
K906-GN-18
191-WH-18
185-YL-18
185-YL-18
L968-OR-18
A590-BU-18
200-BK-18
F771-OR-18
F773-OR-18
L969-WH-18
A589-OR-18
F774-WH-18
615-YL-18
615-YL-18
11
8
F772-WH-18
GG
5
A770-PK-18
786-GN-18
A589-OR-18
A590-BU-18
191-WH-18
K906-GN-18
2
12
10
K907-BU-18
9
185-YL-18
7
6
4
578-BU-18
3
1
185-YL-18
3
2
1
152-BU-18
575-YL-18
576-PK-18
200-BK-18
200-BK-18
BACKUP
EPR VALVE SW
114-0421
200-BK-18
200-BK-18
200-BK-18
GG
BACKUP
GOV SW
110-7884
K909-BU-18
200-BK-18
K909-BU-18
L972-BU-18
791-RD-18
113-OR-18
576-PK-18
L972-BU-18
185-YL-18
173-YL-18
530-OR-18
501-GN-18
590-GY-18
K909-BU-18
575-YL-18
F773-OR-18
F774-WH-18
A770-PK-18
A769-GY-18
A768-BU-18
K906-GN-18
578-BU-18
576-PK-18
791-RD-18
786-GN-18
152-BU
185-YL-18
113-OR-18
615-YL-18
191-WH-18
A589-OR-18
A590-BU-18
L972-BU-18
A758-BR-18
A757-GY-18
A756-BU-18
A755-PK-18
K907-BU-18
L968-OR-18
L969-WH-18
173-YL-18
F772-WH-18
173-YL-18
A537-PK-18 A537-PK-18
200-BK-18
A537-PK-18
173-YL-18
ATCH
SEAT WITH
SEAT HEATER
111-6458
200-BK-18
615-YL-18
615-YL-18
A537-PK-18
173-YL-18
G
ATCH LOWER
WIPER SW
111-4785
ATCH LOWER
WASHER SW
111-4786
F771-OR-18
G
ATCH POWER
WINDOW SW
111-4789
200-BK-18
200-BK-18
ATCH SEAT
HEATER SW
111-4783
113-OR-18
954-GN-18
L970-GY-18
L13
L17
L18
L19
L5
L6L6
L17
L15
L16
L12
L9
L15
L13
L12
L9
L11
C
B
A
ENG/PUMP CONT
164-8253
615-YL-18
A584-BU-18
A583-YL-18
A587-YL-18
506-PU-18
615-YL-18
615-YL-18
615-YL
615-YL
A590-BU-18
A589-OR-18
191-WH-14
103-RD-18
118-GY
103-RD-18
129-BU
K905-RD
508-PU-18
509-WH-18
511-BR-18
512-GN-18
590-GY-18
501-GN-18
A586-OR-18
200-BK-14
200-BK-14
K997-BU-18
403-GN-18
200-BK-18
K905-RD
235-BK
K911-PK-18
K912-GN-18
CAB
DOME LAMP
096-0721
2
3
4
5
6
1
8
7
ATCH SPEAKER(L)
7Y-5505
ATCH SPEAKER(R)
7Y-5505
2
1
8
3
5
4
7
6
200-BK-18
200-BK-18
200-BK-18
ATCH POWER
WINDOW LIMIT SW
117-6306(NOTE C)
ATCH POWER
WINDOW CONT
117-6305
7
6
5
4
3
8
1
2
5
4
3
2
1
6
E
E
E
E
E
E E D D
A A A A
R. LIMIT
GND
F. LIMIT
+B
WIPER
200-BK-18
200-BK-18
200-BK-18
A584-BU-18
615-YL
200-BK-18
A591-PU-18
A591-PU-18
200-BK-18
200-BK-14
200-BK-14
200-BK-18
615-YL-18
403-GN-18
129-BU
103-RD-18
K912-GN-18
K911-PK-18
K997-BU-18
200-BK-14
A586-OR-18
501-GN-18
590-GY-18
A583-YL-18
A584-BU-18
506-PU-18
118-GY
512-GN-18
511-BR-18
509-WH-18
508-PU-18
NEUTRAL
SW. DOWN
SW. UP
103-RD-18
200-BK-14
615-YL
A584-BU-18
191-WH-14
A583-YL-18
A587-YL-18
A589-OR-18
C537-GN-18
C538-OR-18
E
A590-BU-18
L972-BU-18
308-YL-18
A758-BR-18
A757-GY-18
A756-BU-18
A755-PK-18
K912-GN-18
K911-PK-18
235-BK-18
L909-BU-18
L908-OR-18
487-OR-18
954-GN-18
L972-BU-18
A758-BR-18
A757-GY-18
200-BK-18
L975-PK-18
K912-GN-18
K911-PK-18
A756-BU-18
A755-PK-18
235-BK-18
K905-RD-18
308-YL-18
235-BK-18
K905-RD-18
235-BK
K905-RD
F771-OR-18
F772-WH-18
K907-BU-18
L968-OR-18
L969-WH-18
L971-GN-18
L970-GY-18
A761-PU-18
200-BK-18
F771-OR-18
K904-GN-18
496-WH-18
430-BU-18
F772-WH-18
495-GN-18
K907-BU-18
L968-OR-18
491-PK-18
492-GY-18
MONITOR +B OUT
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
405-GY-18
321-BR-18
FRONT PUMP PRESS. SENSOR
HYD OIL LEVEL SW
AIR CLEANER SENSOR
L969-WH-18
HYD OIL TEMP SENSOR
RS485 - (VALVE CONT)
RS485 + (VALVE CONT)
RS232C (GND)
RS232C (RX)
COOLANT SENSOR
9
20
10
28
31
26
13
30
29
35
40
2
6
39
6
24
25
22
15
RS485 - (RH JOYSTICK)
7
38
12
TRAVEL ALARM
ENG OIL PRESS. SW
36
SWING BRAKE SOL
C468-BU-18
412-BU-18
763-BU-18
A762-PU-18
788-YL-18
23
EPR VALVE (-)
17
21
8
RS485 + (LH JOYSTICK) 7
L977-YL-18
8
L974-GN-18
L978-GY-18
A771-PU-18
RS485 - (LH JOYSTICK)
RS485 + (PEDAL) 9
403-GN-18
10
RS485 + (SEMI AUTO)
RS485 - (PEDAL)
RS485 + (RADIO CONT)
17
HYD TANK PRESS. SW
RS485 + (MONITOR)
RS485 - (SEMI AUTO)
HYD TANK INDICATOR
RS485 + (RH JOYSTICK)
RS485 - (MONITOR)
27
18 TRAVEL PRESS. SW
HYD OIL FILTER INDICATOR
18 RS485 - (RADIO CONT)
RS485 + (ELEC GOV)19
+B
+B
AIH INDICATOR
FINE SWING SW
K997-BU-18
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 (TX)
KEY SW START
A
37
4
3
OPTION SENSOR (PWM)
ATCH
ANTENNA
106-0036
1
16
19
5
OPTION SENSOR (PWM)
32
33
14
11
34
JOYSTICK +B OUT
A A
AA
A A
2
3
4
5
6
1
K905-RD
235-BK
L975-PK-18
954-GN-18
K997-BU-18
L970-GY-18
L971-GN-18
487-OR-18
A761-PU-18
K904-GN-18
496-WH-18
430-BU-18
K997-BU-18
495-GN-18
491-PK-18
492-GY-18
405-GY-18
7
8
1
6
5
4
3
2
321-BR-18
C468-BU-18
412-BU-18
2
3
4
5
6
11
1
10
9
8
7
12
763-BU-18
A762-PU-18
788-YL-18
403-GN-18
L977-YL-18
L974-GN-18
L978-GY-18
A771-PU-18
K997-BU-18
K997-BU-18
L908-OR-18
L909-BU-18
235-BK-18
A
L10
A
L970-GY-18
954-GN-18
954-GN-18
L970-GY-18
L14
L10
L15
L13
L12
L9
L11L11
L12
L13
L14
L9
L15
L4
L3
L1
L4
L3
L1
200-BK-18
200-BK-18
NOTE D: NOT NECESSARY FOR ELECTRIC OPENABLE
WINDSHIELD.
200-BK-18
200-BK-18
A
113-OR-18
615-YL-18
103-RD-18
200-BK-18
508-PU-18
511-BR-18
512-GN-18
509-WH-18
3
1
8
2
5
4
6
7
ATCH POWER
WINDOW LIMIT SW
117-6306 (NOTE C)
L L
WINDOW
LIMIT SW
124-3974 (NOTE D)
E
ATCH
CAB LAMP
5I-8250
ATCH
CAB LAMP
5I-8250
111-4813
LL
200-BK-18
200-BK-18
200-BK
615-YL
DD
DD
200-BK
200-BK-18
A584-BU-18
615-YL
200-BK-18
A584-BU-18
615-YL
200-BK-18
615-YL-18
615-YL-18
113-OR-18
ATCH
AUX HYD
PRESS. SW
106-0181
ATCH
HAMMER
PRESS. SW
106-0181
L970-GY-18
954-GN-18
200-BK-18
200-BK-18
A
A
A
200-BK-18
L970-GY-18
954-GN-18
200-BK-18
200-BK-18
A588-GN-18
615-YL-18
200-BK-18
E
ATCH
AM/FM RADIO
153-2445
P
H
H
PLATFORM
A
200-BK-18
615-YL-18
575-YL-18
152-BU-18
113-OR-18
576-PK-18
103-RD-18
200-BK-18
508-PU-18
200-BK-18
509-WH-18
511-BR-18
512-GN-18
A588-GN-18
HYD LOCK SOL
121-1491
SPEAKER (+)
SPEAKER (-)
200-BK-18
BUCK UP
GND
SPEAKER (+)
ACC (+)
ILLUMI (+)
SPEAKER (-)
575-YL-18
200-BK-18
152-BU-18
320-RD-18
NEUTRAL START
LIMIT SW
111-4799
HORN SW
128-2134
150-RD-18
ATCH RADIO
151-GN-18
154-RD-18
576-PK-18
2
1
ATCH LOWER
WIPER MOTOR
113-3452
+
S
+1
-
MOTOR
2
1
2
1
2
4
1
3
C
B
A
L25
L8
L7
L7
L25
L2
P
NOTE C: USE WITH ELECTRIC OPENABLE WINDSHIELD.
5
4
3
2
1
OPERATOR STATION
129-BU
K911-PK-18
K997-BU-18
103-RD-18
K912-GN-18
615-YL-18
A/C PHOTO
SENSOR
113-3431 (NOTE A)
Y/G
Y/W
C537-GN-18
C538-OR-18
1
2
13
12
10
6
5
8
11
9
D
CAB
3
D
D
D
+
530-OR-18
A580-BR
506-PU-18
A581-GN
A582-PU
200-BK-14
200-BK
200-BK
A586-OR-18
200-BK-18
118-GY
W.CCW
W.CW
REV
501-GN-18
STOP
200-BK-18
WIPER MOTOR
122-9603
GND
+B
L CHASSIS
L BOOM
WASH
W LOW
W INT (3)
G
G
G
200-BK-18
A758-BR-18
A757-GY-18
A756-BU-18
113-OR-18
791-RD-18
105-RD
786-GN-18
307-OR-18
200-BK-18
530-OR-18
501-GN-18
SWITCH PANEL
153-2500
KEY SW
9G-7641
R
C
ONE TOUCH
LOW IDLE SW
128-2134
6
S
B
OFF
ON
ST
590-GY-18
L972-BU-18
A755-PK-18 PK
BU
GN
308-YL-18
BR
BK
200-BK-18
S4
S3
S2
S1
COM
G
THROTTLE
POS SW
106-0107
WIPER CONT
155-7042
118-GY
A583-YL-18
GND
506-PU-18
WASH
201-BK-18
ACC
501-GN-18
WA+
A583-YL-18
403-GN-18
590-GY-18
403-GN-18
MONITOR
106-0172
A579-OR
615-YL-18
-
LOW
WIPER CUT
590-GY-18
SERVICE
METER
6T-7337
RISE.S
MOTOR
K912-GN-18
A584-BU-18
103-RD-18
K997-BU-18
DD
K911-PK-18
INT (3)
200-BK
GND
LIGHT
RS485-
+B
A584-BU-18
129-BU
MAIN
200-BK-14
200-BK
RS485+
201-BK-18
CIGAR
LIGHTER
9W-0335
200-BK-18
A584-BU-18
200-BK-18
200-BK-18
A584-BU-18
615-YL
200-BK-18
200-BK-18
L6
L5
L2
L3
L4
L4
L4
L3
L3
D
101-RD-4
877-YL-4
101-RD-4
877-YL-4
877-YL-4
AIR HEATER
5I-7746
B
101-RD-4
877-YL-4
200-BK-18
RELAY PANEL
101-RD-4
877-YL-4
101-RD-4
877-YL-4
200-BK-18
306-GN-18
308-YL-18
403-GN-18
306-GN-18
308-YL-18
306-GN-18
200-BK-18
REGULATOR
AIR HEATER
RELAY
116-0114
1
2
TEMP.
KEY SW.(ON)
GND
KEY SW.(START)
RELAY
CHECK TERM.
308-YL-18
AIR HEATER
CONT UNIT
104-3204
200-BK-18
403-GN-18
310-PU-18
INDICATOR
306-GN-18
BLOCK
121-1023
BLOCK AS.
7Y-5499
169-RD-10
169-RD-10
AB
101-RD-6
AB
101-RD-10
169-RD-10
C
BAT. BREAKER 2
139-4724
30A
169-RD-10
513-OR-18
JJ
1
KK
KK
169-RD-10
2
(NOTE B)
169-RD-10
169-RD-10
H
A
169-RD-10
169-RD-10
200-BK-14
200-BK-14
175-RD-14
200-BK-14
103-RD-18
ATCH A/C
SWITCH PANEL
139-7207
HEATER
SWITCH PANEL
139-7261
200-BK-14 B
200-BK-18
327-PK-14
168-RD-14
GND
ON (KEY)
SOLENOID
+ BATTERY
BK-20
GN-20
BU-14
RD-14
ENGINE
SHUTDOWN
TIMER
138-5190
530-OR-18
530-OR-18 A586-OR-18
530-OR-18
530-OR-18
530-OR-18
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF.
THIS SCHEMATIC IS FOR THE 318B-HYD EXCAVATOR.
NOTE B: USE WITH COLD WEATHER.
T
T
V
V
V
ATCH
CONVERTER
134-1346
TO RADIO
ATCH RADIO CONVERTER
512-GN-18
509-WH-18
511-BR-18
508-PU-18
A513-RD-18
8
6
7
4
2
5
1
3
592-BU-18
GND
IGN
592-BU-18
A513-RD-18
200-BK-18
12V
MEM
24V
113-OR-18
103-RD-18
508-PU-18
200-BK-18
113-OR-18
103-RD-18
511-BR-18
6
4
2
5
1
3
ANTENNA
200-BK-18
509-WH-18
512-GN-18
8
7
1
2
3
4
A586-OR-18
5
W INT (6)
A586-OR-18530-OR-18
6
INT (6)4
7
DIODE
121-1022
309-GY-18
308-YL-18
306-GN-18
168-RD-14
327-PK-14
200-BK-18
SS
TT
RR
ZZ
YY
VV
UU
PP
NN
SS
WW
YY
196-BU
196-BU
196-BU
INSP LAMP
196-BU
200-BK-18
179-BU-10
189-RD-14
113-OR-18
113-OR-18
RADIO
113-OR-18
113-OR-18
113-OR-18
177-RD-10
172-RD-18
173-YL-18
200-BK-18
113-OR-18
308-YL-18
SWITCH PANEL
113-OR-18
579-BR-14
308-YL-18
J
179-BU-10
178-GN-10
113-OR-18
308-YL-18
308-YL-18
101-RD-8
200-BK-18
308-YL-18
DIODE
121-1022
112-PU-18
K909-BU-18
200-BK-18
308-YL-18
177-RD-10
101-RD-10
112-PU-6
308-YL-18
308-YL-18
105-RD
173-YL-18
129-BU
VV
XX
L21
179-BU-10
L1
1
6
7
8
9
5
4
3
2
11
12
10
200-BK-18
200-BK-18
308-YL-18
F774-WH-18
F773-OR-18
A761-PU-18
172-RD-18
178-GN-10
101-RD-6
308-YL-18
308-YL-18
308-YL-18
110-RD-14
189-RD-14
308-YL-18
111-RD-14
308-YL-18
101-RD-6
109-RD-6
ZZ
579-BR-14
112-PU-18
124-RD-14
200-BK-18
RR
200-BK-18
307-OR-18
330-YL-18
154-RD-18
149-PU
BREAKER 2
139-4724
124-RD-14
579-BR-14
403-GN-18
J703-PK-18
607-PK-18
322-GY-18
616-BU
309-GY-18
A718-PU-18
304-WH-8
877-YL-8
101-RD-6
109-RD-6
178-GN-10
179-BU-10
235-BK-18
L908-OR-18
L909-BU-18
A588-GN-18
150-RD-18
151-GN-18
112-PU-6
111-RD-14
307-OR-18
BREAKER 3
139-4724
A587-YL-18
579-BR-14
101-RD-6
877-YL-8
304-WH-8
177-RD-10
179-BU-10
L975-PK-18
308-YL-18
109-RD-8
177-RD-10
30A
K909-BU-18
308-YL-18
124-RD-14
A770-PK-18
149-PU
877-YL-8
101-RD-8
615-YL
154-RD-18
786-GN-18
791-RD-18
109-RD-8
304-WH-8
320-RD-18
103-RD-18
189-RD-14
115-RD-14
154-RD-18
307-OR-18
200-BK-18
NEUTRAL START
RELAY
111-4871
308-YL-18
306-GN-18
109-RD-6
A770-PK-18
154-RD-18
307-OR-18
189-RD-14
111-RD-14
L975-PK-18
151-GN-18
150-RD-18
A588-GN-18
A587-YL-18
791-RD-18
103-RD-18
320-RD-18
786-GN-18
149-PU
115-RD-14
615-YL
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
L975-PK-18
579-BR-14
308-YL-18
200-BK-18
A718-PU-18
200-BK
INDICATOR
403-GN-18
2
1
110-RD-14
START
RELAY
125-1302
330-YL-18
616-BU
306-GN-18
607-PK-18
322-GY-18
DISCONNECT SW
7N-0718
7N-0719(NOTE B)
UU
178-GN-10
196-BU
129-BU
178-GN-10
196-BU
185-YL-18
152-BU
118-GY
147-PU
120-YL
191-WH-14
140-BU
150-RD-18
111-RD-14
150-RD-18
105-RD
110-RD-14
168-RD-14
K905-RD
307-OR-18
308-YL-18
308-YL-18
307-OR-18
30A
111-RD-14
KEY SW
L908-OR-18
L909-BU-18
235-BK-18
105-RD
235-BK-18
L909-BU-18
L908-OR-18
DD
BREAKER 1
9S-0174
OUT 1
OUT 2
+B
IN 1
GND
IN 2
C
A
C
A
C
B
A718-PU-18
RELAY PANEL
6
5
4
3
2
1
105-RD
BACKUP
RESISTOR
102-8015
10
308-YL-18
308-YL-18
308-YL-18
308-YL-18
200-BK-18
LL
L23
4
2
3
1
168-RD-14
196-BU
103-RD-18
K997-BU-18
763-BU-18
L977-YL-18
L978-GY-18
L974-GN-18
A771-PU-18
K906-GN-18
K904-GN-18
A761-PU-18
F773-OR-18
F774-WH-18
L971-GN-18
487-OR-18
172-RD-18
A768-BU-18
168-RD-14
321-BR-18
492-GY-18
405-GY-18
C468-BU-18
A762-PU-18
788-YL-18
403-GN-18
495-GN-18
496-WH-18
491-PK-18
A769-GY-18
200-BK
200-BK
200-BK-18
HYD LOCK SOL
RELAY
111-4871
200-BK-18
200-BK-18
140-BU
200-BK-18
200-BK-18
4
3
5
200-BK-18
BK
YL
5
327-PK-14
877-YL-8
C468-BU-18
179-BU-10
178-GN-10
403-GN-18
403-GN-18
124-RD-14
308-YL-18
3
200-BK-18
GND
F/B
+B
ACCEL
DECEL
6
ENG GOV
ACTUATOR
106-0126
KEY
200-BK-18
A
2
1
304-WH-8
B
788-YL-18
CONN 84
CONN 57
CONN 86
B
101-RD-6
MOTBAT
G
S
RD-00
B
ENG SPEED
PICKUP
125-2966
A762-PU-18
RD-00
AA GG
MOTOR
2
1
STARTER
127-5819
GLOW
PLUG
116-9985
877-YL-8
B
327-PK-14
ENG
SHUTDOWN SOL
117-9343
200-BK-6
109-RD-6
T
A718-PU-18
200-BK-18
AIH COOLANT
TEMP SENSOR
125-2982
B
2
1
200-BK-18
BB
B
B
B
200-BK-18
CONN 89
403-GN-18
109-RD-6
J703-PK-18
200-BK-18
513-OR-18
B
309-GY-18
BB
200-BK-18
B
ALTERNATOR
5I-8085
ENG OIL
LEVEL SW
111-4760
1
2
2
1
200-BK-18
200-BK-18
C468-BU-18
405-GY-18
A718-PU-18
496-WH-18
491-PK-18
168-RD-18
487-OR-18
L977-YL-18
763-BU-18
L978-GY-18
A768-BU-18
A769-GY-18
487-OR-18
168-RD-18
491-PK-18
200-BK-18
PUMP DISCHARGE
PRESS. SENSOR
106-0178
SIGNAL
GROUND
+B
BK-18
BR-18
B
C
CHASSIS
B
YL-18
200-BK-6
200-BK-18
200-BK-18
200-BK-18
K997-BU-18
200-BK-18
K904-GN-18
200-BK-18
A
200-BK-18
496-WH-18
200-BK-18
200-BK-18
B
B
B
B
2
1
ENG/PUMP CONT
SOL
111-9916
T
COOLANT TEMP
SENDER
5I-7578
LEVEL FINISH
SOL
121-1490
A768-BU-18
TRENCHING
SOL
121-1490
TRAVEL SPEED
SOL
121-1491
A769-GY-18
L978-GY-18
200-BK-18
763-BU-18
200-BK-18
L977-YL-18
200-BK-18
B
L971-GN-18
A771-PU-18
L974-GN-18
200-BK-18
200-BK-18
B
200-BK-18
B
SIGNAL
GROUND
200-BK-18
BOOM RAISE
PRESS. SW
106-0180
B
B
2
1
+B
A
168-RD-18
B
HYD OIL
FILTER
INDICATOR
116-3660
200-BK-18
200-BK-18
200-BK-18
B
IMPLEMENT
PRESS. SW
106-0179
491-PK-18
HYD OIL
TEMP SENDER
4I-5394
HYD OIL
LEVEL SW
111-4760
496-WH-18
C
T
B
200-BK-18
487-OR-18
A769-GY-18
A768-BU-18
200-BK-18
492-GY-18
492-GY-18
L978-GY-18
200-BK-18
763-BU-18
200-BK-18
TRAVEL
PRESS. SW
106-0179
200-BK-18
L977-YL-18
200-BK-18
K904-GN-18
309-GY-18
405-GY-18
403-GN-18
200-BK-6
J703-PK-18
L
E
B
P
R
ALT
B
B
K997-BU-18
K997-BU-18
K904-GN-18
EE
EE
2
1
1
2
2
1
1
ENG OIL SW
5I-8005
2
ENG
GROUND STRAP
134-3355
1
2
1
2
L20
4
L20
L14
L10
L14
A A
AIR CLEANER SW
109-9330
430-BU-18
616-BU
322-GY-18
607-PK-18
877-YL-8
327-PK-14
L10
513-OR-18
200-BK-18
J703-PK-18
309-GY-18
109-RD-6
101-RD-6
A718-PU-18
ATCH A/C
CLUTCH SOL
154-0490
L1
304-WH-8
124-RD-14
175-RD-14
110-RD-14
115-RD-14
200-BK-18
BB
(NOTE B)
BK-00 RD-00 RD-00
POS
NEGNEG
POS
BATTERY
3T-5760
(NOTE B)
GG
(NOTE B)
BB
(NOTE B)
HH
(NOTE B)
321-BR-18
LL
495-GN-18
K906-GN-18
168-RD-14
607-PK-18
322-GY-18
616-BU
6
BK
YL
2
1
7
8
9
10
11
J
616-BU
322-GY-18
607-PK-18
168-RD-14
200-BK-18
200-BK-18
200-BK-18
200-BK-18
K906-GN-18
495-GN-18
SWING BRAKE
SOL
121-1491
B
2
1
200-BK-18
200-BK-18
K906-GN-18
MM
FUEL
SENSOR
105-9911
ATCH
REFUELING SW
5C-6108
2
1
B
325-PK-18
495-GN-18
616-BU
322-GY-18
607-PK-18
168-RD-14
200-BK
200-BK-14
168-RD-14
607-PK-18
200-BK-18
322-GY-18
200-BK-18
200-BK
616-BU
200-BK-18
607-PK-18
168-RD-14
A
B
NB
S S
200-BK-18
200-BK
607-PK-18
200-BK-18
616-BU
200-BK-18
200-BK-14
200-BK-18
322-GY-18
200-BK
12
200-BK-18
322-GY-18
N
K909-BU-18
616-BU
200-BK
200-BK-18
200-BK
S
322-GY-18
168-RD-18
200-BK-14
L976-GN-18
B
B
B
B
ATCH
BOOM LAMP
5I-8250
CHASSIS
ATCH
REFUELING
PUMP
123-3928
ATCH
REFUELING
START SW(NO)
6T-9442
R
N
N
HORN
7Y-3919
K
K
200-BK-18
323-WH-14
A718-PU-18
+
113-OR-18
113-OR-18
179-BU-10
178-GN-10
309-GY-18
616-BU
308-YL-18
307-OR-18
579-BR-14
124-RD-14
152-BU-18
152-BU-18
200-BK-18
HH
(NOTE B)
BK-00
168-RD-14168-RD-14
327-PK-14327-PK-14
322-GY-18
607-PK-18
A587-YL-18
2
8
9
3
CHASSIS
DD
200-BK
200-BK
A770-PK-18
RELAY PANEL
200-BK-18
BK-00
4
1
149-PU
149-PU-18
307-OR-18
200-BK-18
111-RD-14
189-RD-14
110-RD-14
111-RD-14
200-BK-18
151-GN-18
K909-BU-18
A
TIMER RELAY
111-4870
150-RD-18
115-RD-18
A588-GN-18
791-RD-18
607-PK-18
615-YL
151-GN-18
150-RD-18
200-BK
CAB/CHASSIS
LAMP RELAY
111-4871
A588-GN-18
A587-YL-18
K909-BU-18
6
1
115-RD-14
115-RD-14
2
BB
189-RD-14
103-RD-18
5
4
5
60A
320-RD-18
791-RD-18
786-GN-18
786-GN-18
154-RD-18
615-YL
200-BK-18
149-PU
616-BU
6
3
12
2
1
7
11
8
9
-
616-BU
1
2
200-BK-14
ATCH
REFUELING
RELAY 2
111-4871
ATCH
REFUELING
RELAY 1
111-4871
200-BK-14
168-RD-14
168-RD-14
168-RD-18
168-RD-14
168-RD-14
200-BK-18
365-YL-18
L976-GN-18
325-PK-18
365-YL-18
RR
ATCH
REFUELING
STOP SW(NC)
9X-4184
365-YL-18
L976-GN-18
L976-GN-18
HORN RELAY
111-4871
BOOM LAMP
RELAY
111-4871
10
A770-PK-18
322-GY-18
103-RD-18
124-RD-14
112-PU-18
110-RD-14
320-RD-18
103-RD-18
A587-YL-18
A588-GN-18
124-RD-14
K909-BU-18
K909-BU-18
30A
BAT. BREAKER 1
139-4724
579-BR-14
150-RD-18
151-GN-18
200-BK-18
616-BU
310-PU-18
149-PU
786-GN-18
A718-PU-18
11
320-RD-18
322-GY-18
103-RD-18
101-RD-6
3
1
2
4
BUS-BAR
149-5068
7
200-BK-18
791-RD-18
HEATER
CONT UNIT
134-3283
J703-PK-18
J703-PK-18
STARTER
CONT RELAY
094-2080
L975-PK-18
200-BK-18
487-OR-18
200-BK-18
365-YL-18
L976-GN-18
322-GY-18
616-BU
CHASSIS
LAMP
5I-8251
ATCH
BOOM LAMP
5I-8250
B MM
325-PK-18
325-PK-18 325-PK-18
1
2
HEATER
RELAY
9X-8124
2
1
1
2
325-PK-18
A588-GN-18
325-PK-18 325-PK-18
C
2
1
HORN
7Y-3920
L4
L3
147-PU
607-PK-18
615-YL
12
L
GND
S
P
YL
BK
WH/BU
WH/YL
J703-PK-18
L3
200-BK-18
403-GN-18
327-PK-14
168-RD-14
200-BK-18
308-YL-18
308-YL-18
200-BK-18
L23
L22
L22
L21
L17
L16
308-YL-18
L10
L14
L14
L10
A
147-PU
L4
L1
L1
N
403-GN-18
309-GY-18
N
CHECK TERM.
2
1
307-OR-18
110-RD-14
RELAY
KEY SW.(START)
GND
KEY SW.(ON)
L975-PK-18
TEMP.
115-RD-14
403-GN-18
MAIN RELAY
3T-0376
L22
RWH/GN
L908-OR
L909-BU
235-BK
E
D
C
B
A
235-BK
L909-BU
309-GY-18
L908-OR
L909-BU
L908-OR
235-BK
310-PU-18
200-BK-18
GROUND STRAP
134-3344
309-GY-18
TT
403-GN-18
308-YL-18
110-RD-14
PP
NN
XX
WW
FAN RELAY
111-4871
NOTE A: USE WITH A/C UNIT.
200-BK-18
L21
L23
CC
RELAY PANEL
J703-PK-18
147-PU
ALTERNATOR (P TERM)
(170-6877 HE 00)
UNLESS OTHERWISE SPECIFIED ALL WIRE IS 16 GAUGE.
VV
ZZ
CC
BB
AA
XX
P
L
K
H
G
E
D
C
B
N
WW
R
S
A
AB
LL
KK
JJ
J
PP
RR
TT
HH
V
MM
NN
T
GG
FF
SS
UU
YY
DD
EE
X
G-7
G-7
G-9
F-9
F-9
G-7
J-3
G-1
C-2
H-4
E-4
B-6
B-5
G-8
A-2
B-2
G-7
B-2
B-3
G-3
H-9
H-9
G-9
D-9
C-2
G-7
G-7
H-8
E-9
H-3
A-2
G-7
J-3
E-9
G-6
G-7
H-7
G-7
G-9
A-9
H-5
150-6938
153-2548
170-6863
116-0080
170-6862
150-6936
111-4841
116-0243
140-0920
153-2454
150-7014
150-6989
153-2555
170-6876
170-6873
128-8876
150-6937
116-0096
116-0098
150-7013
153-2544
153-2545
153-2537
153-2492
145-0573
150-6943
150-6942
150-6940
170-6868
150-7026
132-1827
150-6944
150-7022
170-6867
7G-1060
150-6941
150-6939
153-2549
134-3344
134-3355
116-0258
GY
PU
BR
RED
WHITE
ORANGE
YELLOW
PINK
ABBREV COLOR
BLACK
GRAY
PURPLE
BROWN
BK
PK
YL
OR
WH
RD
GN
BU
GREEN
BLUE
CABLE AS.
WIRE AS.
DESCRIPTIONSYMBOL
CONNECTOR
ELECTRICAL CONNECTION
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
BLADE, SPADE, RING,
OR SCREW TERMINAL
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ATCH WIRE, CABLE,
COMPONENT
L#
CIRCUIT GROUPING
DESIGNATION
IDENT PART NO. LOC
HARNESS AS.
STRAP AS.
TO MACHINE STRUCTURE
CONN 3
CONN 1
CONN 4
CONN 2
CONN 55
CONN 54
CONN 53
CONN 6
CONN 10
CONN 11
CONN 12
CONN 7 CONN 8
CONN 9
CONN 5 CONN 4 CONN 3
CONN 85
CONN 19
CONN 18
CONN 58
CONN 17
CONN 23
CONN 42
CONN 41
CONN 43
CONN 44
CONN 23
CONN 35CONN 34
CONN 46
CONN 45
CONN 33
CONN 36
CONN 37
CONN 95
CONN 94
CONN 24
CONN 97
CONN 88
CONN 28
CONN 38
CONN 52
CONN 75
CONN 74
CONN 72
CONN 40
CONN 101
SIS
CONN
OPERATOR STATION OPERATOR STATION
CONN 87
CONN 69
CONN 82
CONN 73
CONN 71
CONN 70
CONN 22
CONN 21
CONN 21
CONN 61
CONN 49
CONN 59
CONN 60
CONN 66
CONN 56
CONN 83
CONN 68
CONN 100
CONN 99
CONN 62
CONN 63
CONN 67
CONN 64
CONN 90
CONN 26
CONN 93
CONN 92
CONN 91
CONN 25
CONN 96
CONN 81
CONN 80
CONN 79
CONN 20
CONN 27 CONN 30CONN 29CONN 28
CONN 2
CONN 1
CONN 65
CONN 98
CONN 76
CONN 31
CONN 16
CONN 13
CONN 14
CONN 15
CONN 78
CONN 32
CONN 77
CONN 48
CONN 47
CONN 50
CONN 51
9 8 7 6 5 4 3 2 1
G
J
H
F
E
D
C
B
A
G
J
H
F
E
D
C
B
A
9 8 7 6 5 4 3 2 1
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS OFF.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS ON.
STARTING CIRCUIT.
GAUGE CIRCUIT.
MONITOR CIRCUIT. (EMS)
WASHER/WIPER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
START AID CIRCUIT.
TRANSMISSION CONTROL CIRCUIT.
ALL DASHED LINES ARE ATTACHMENTS.
Wire Description
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
Power Distribution Circuits
Accessory Circuits Con't
101 RD Bat (+) 519 PK Thermostat To Refrigerant Press. SW
103 RD Aux Ckt 530 OR Washer Right
105 RD Key Sw 575 YL Wiper-Aux (Park)
109 RD Alt Output (+) Term. 576 PK Wiper-Aux (Low)
110 RD Aux Ckt 578 BU Washer-Aux
111 RD Aux Ckt 579 BR A/C Blower Motor No. 1
112 PU Main Power Rly Output 590 GY Wiper Sw To Intermittent Module
113 OR VIMS B+ Switched 592 BU DC/DC Convertor Power Output
115 RD Aux Ckt A513 RD DC/DC Convertor Memory Output
118 GY Aux Ckt A537 PK Seat Heater (Resistive Element In Seat)
120 YL Aux Ckt A579 OR Wiper Motor +
124 RD A/C A580 BR Wiper Motor
129 BU Aux Ckt A581 GN Wiper Motor Raise
135 BU Aux Ckt A582 PU Wiper Motor Stop
140 BU Aux Ckt A583 YL Power Window Interlock To Wiper Cont
147 PU Aux Ckt A584 BU Front Window Limit SW To Wiper Cont
149 PU Aux Ckt A586 OR Wiper SW To Wiper Cont
150 RD Bat (+) A587 YL Power Window Cont To Safety Sol Relay
151 GN Aux Ckt A588 GN Safety Sol Relay To Sol
152 BU Aux Ckt A589 OR Power Window Up
154 RD Aux Ckt A590 BU Power Window Down
168 RD Aux Ckt A591 PU Rear Window Limit SW
169 RD Aux Ckt C537 GN A/C Photo Sensor + Sig
172 RD Aux Ckt C538 OR A/C Photo Sensor - Sig
173 YL Aux Ckt
Lighting Circuits
175 RD Aux Ckt 607 PK Flood Lamp - Front
176 YL Aux Ckt 615 YL Cab Flood Lamp
177 RD Main Brkr 616 BU Boom Flood Lamp
178 GN Main Brkr
Control Circuits
179 BU Aux Ckt 763 BU Torque Convertor SW
180 GN Aux Ckt 786 GN Engine Speed Cont - Hi Press SW
185 YL Aux Ckt 788 YL Engine Speed (+)
189 RD Aux Ckt 791 RD Engine Speed Cont - Lo Sol
191 WH Aux Ckt 877 YL Glow Plug Magnetic SW To Glow Plug
196 BU Aux Ckt 954 GN Hammer SW A
Ground Circuits
955 BU Hammer Sol A
200 BK Main Chassis A718 PU Start Aid Coolant Sensor Signal
201 BK Operator Monitor Return A755 PK Throttle SW #1
210 BK Converter Output (24/12 Volt) A756 BU Throttle SW #2
235 BK Electronic Pump Cont Gnd A757 GY Throttle SW #3
Basic Machine Circuits
A758 BR Throttle SW #4
304 WH Starter Relay No. 1 Output A761 PU Electronic Pump Cont
306 GN Starter Relay Coil To Neut Start SW Or Key SW A762 PU Electronic Pump Cont
307 OR Key SW To VIMS Sensor Module A768 BU Pump Cont Valve #1 (+)
308 YL Main Power Relay Coil A769 GY Pump Cont Valve #2 (-)
309 GY Alternator Regulator Terminal A770 PK Electronic Pump Control Bypass SW To Resistor
310 PU Start Aid SW To Start Aid Sol A771 PU Float SW
320 RD Horn Relay Coil To SW F771 OR Backup SW
321 BR Backup Alarm Lamp Travel Alarm F772 WH Backup SW
322 GY Backup Alarm Lamp Travel Alarm F773 OR Govenor Accel
323 WH Fuel Pump Power F774 WH Govenor Decel
325 PK Fuel Pump Relay Cut-Out J703 PK Alt Pulse Sig To Anti-Start Relay (Was D787 GN)
327 PK Shutdown Sol K904 GN Pump Discharge Sig
330 YL Neutral Start Relay Coil K905 RD Pump Discharge (+) B
365 YL Fuel Pump Relay To SW K906 GN Swing Brake Sol Signal
Monitoring Circuits
K907 BU Swing Brake Sol (+) B
403 GN Alternator (R) Term. K909 BU Backup SW (+) B
405 GY Opr Mon Oil Press. (Low Setting) K911 PK E/P Controller RS485 (+)
412 BU Opr Mon Cool Flow K912 GN E/P Controller RS485 (-)
430 BU Opr Mon Air Filter K997 BU (+) V Sensor
487 OR Hyd Oil Flow SW L908 OR Controller RS-232C Tx
491 PK Hyd Oil Temp Sensor L909 BU Controller RS-232C Rx
492 GY Coolant Temp Sensor Signal L968 OR Electronic Pump Control Ps Valve (-)
495 GN Fuel Level Signal L969 WH Electronic Pump Control Ps Valve (+)
C468 BU Engine Oil Level L970 GY Electronic Pump Control To Switch Common Return
496 WH Opr Mon Panel Hyd Oil Level L971 GN Electronic Pump Control To Travel Pressure Switch
Accessory Circuits
L972 BU Low Idle Switch
501 GN Wiper - Front (Low) L974 GN Electronic Pump Control Boom Raise Pressure Sw
506 PU Washer - Front L975 PK Start Aid Control Lamp Output
508 PU Radio Speaker-Left L976 GN Excavator Fuel Pump Switch
509 WH Radio Speaker-Left (Common) L977 YL Trenching Sol
511 BR Radio Speaker-Right L978 GY Level Finish Sol
512 GN Radio Speaker-Right (Common) 8630 BU Lamp Relays
513 OR A/C Compressor/Refrigerant Pressure Switch
Off Machine Switch Specification
Part No. Function Actuate Deactuate Contact Position
106-0179 Implement Pressure 1520 ± 98 kPa 1127 kPa MIN Normally
Travel Pressure (220 ± 14 psi) (163 psi MIN) Open
106-0180 Boom Raise Pressure 2646 ± 196 kPa 2156 ± 196 kPa 1-2 Normally Open
(384 ± 28 psi) (313.00 ± 28.00 psi) 1-3 Normally Closed
9W-2653 Brake Accumulation Pressure 8270 kPa MAX 6890 ± 345 kPa Normally
Park Brake Pressure (1200 psi MAX) (1000 ± 50 psi) Closed
Hyd Case Drain Pressure
Hyd Pilot Filter Pressure
9X-7781 Hyd Return To Tank Pressure 210 ± 70 kPa -- Normally
Power Train Filter Pressure (30 ± 10 psi) -- Open
Steering Case Drain Pressure
Steering Return Filter Pressure
111-9560 A/C Fan Override Pressure 1585 kPa ± 103 kPa 1275 kPa ± 103 kPa Normally
(230 psi ± 14.9 psi) (185 psi ± 14.9 psi) Closed
114-5333 Refrigerant Pressure (AC) 275 to 2800 kpa¹ -- Normally ²
(40 to 406 psi) -- Open
116-9846 Front Pump Drive Lube Pressure 276 ± 28 kPa 179 kPa MIN Normally
(40 ± 4 psi) (26 psi MIN) Closed
128-5091 Neutralizer Pressure 551 kPa 344 kPa ± 20 kPa A-C Normally Closed
(36.3 psi) (49.9 psi ± 2.9 psi) A-B Normally Open
144-5661 Fuel Filter Pressure 137.9 ± 13.8 kPa 82.7 kPa MIN Normally
Hydraulic Cooling Filter Pressure (20 ± 2 psi) (12.0 psi) Closed
Steering Cooling Filter Pressure
¹ A hysteresis band exists: with increasing pressure the closed condition can be maintained up to 2800 kpa (405 psi), with decreasing pressure the closed
condition can be maintained down to 170 kpa (25 psi).
² Contact position at the contacts of the harness connector.
Resistor, Sender, and Solenoid Specifications
Part No. Component Resistance (Ohms)¹
102-8015 Resistor - Backup 41.00 ± 2.05
4I-5394 Sender - Hydraulic Oil Temperature 6130 to 7500
121-1490 Solenoid - Level Finish 32.0 ± 3.2
121-1491 Solenoid - Travel Speed 32.0 ± 3.2
Hydraulic Lock
Swing Brake
111-9916 Solenoid - Engine Pump Control 11.7 ± 1.2
¹ At room temperature.