318B L EXCAVATOR ELECTRICAL SYSTEM

©
1998 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR2922
JULY 1998
318B L Excavator
Electrical System
3LR1-UP
9WW1-UP
6DZ1-UP
7KZ1-UP
T
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
Normally open switch that is closed due to an applied condition, and will open again with a
specific decrease in that condition.
Normally closed switch that will open with an increase of a specific condition.
Normally closed switch that is open due to an applied condition, and will close again
with a specific decrease in that condition.
The circle indicates that the component has screw terminals and a wire can be disconnected
from it.
No circle indicates that the wire cannot be disconnected from the component.
This indicates that the component has a wire connected to it that is connected to ground.
This indicates that the component does not have a wire connected to ground. It is grounded
by being fastened to the machine.
Electrical Schematic Symbols And Definitions
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
A AA
2
A AA
1
2
325-PK-14
C
A
325-PK-14
200-BK-14
T
FUSE - A component in an electrical circuit that will open the circuit if too much current flows
through it.
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.
CIRCUIT BREAKER (C/B) - A component in an electrical circuit that will open the circuit if too
much current flows through it. This does not destroy the circuit breaker and it can be reset to
become part of the circuit again.
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.
Socket
Pin
Pin or Socket
Number
Wire, Cable, or Harness
Assembly Identification
Single Wire
Connector
Circuit Number
Identification
Wire
Gauge
Wire
Color
Plug
Receptacle
9X-1123
Component
Part Number
Electrical Schematic Symbols And Definitions
1
1
1
2
2
Typical representation of a
Sure-Seal connector. The
plugand receptacle contain
both pins and sockets.
Typical representation of a
Deutsch connector. The
plug contains all sockets
and the receptacle contains
all pins.
MAGNETIC LATCH SOLENOID - A magnetic latch solenoid is an electrical component that is
activated by electricity and held latch by a permanent magnet. It has two coils (latch and unlatch)
that make electromagnet when current flows through them. It also has an internal switch that places
the latch coil circuit open at the time the coil latches.
Harness And Wire Electrical Schematic Symbols
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.
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).
410A Over-current in digital output (swing brake solenoid).
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.
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.
Real Time Error Codes
Wire Description
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
101 RD Bat (+) 500 BR Wiper - Front (Park)
103 RD Aux Ckt 501 GN Wiper - Front (Low)
105 RD Key Sw 506 PU Washer - Front
109 RD Alt Output (+) Term. 508 PU Radio Speaker - Left
110 RD Aux Ckt 509 WH Radio Speaker - Left (Common)
111 RD Aux Ckt 511 BR Radio Speaker - Right
112 PU Main Power Rly Output 512 GN Radio Speaker - Right (Common)
113 OR Opr Mon Panel B (+) Switched 513 OR A/C Compressor/Refrigerant Press SW
114 RD Warning Horn (Forward) 519 PK Thermostat To Refrigerant Press SW
115 RD Aux Ckt 524 BU Wiper - Left (Low)
118 GY Aux Ckt 524 GN Wiper - Left (Low)
120 YL Aux Ckt 579 BR A/C Blower Motor No. 1
124 RD A/C 590 GY Wiper SW To Intermittent Module
129 BU Aux Ckt A537 PK Seat Heater (Resistive Element In Cushion)
135 BU Aux Ckt A586 OR Wiper SW To Wiper Cont
139 OR Aux Ckt A588 GN Safety Sol Relay To Sol
140 BU Aux Ckt C537 GN A/C Photo Sensor (+) Sig
147 PU Aux Ckt C538 OR A/C Photo Sensor (-) Sig
149 PU Aux Ckt C576 BU Switch #1 to Medium Press Sol #1
150 RD Bat (+) C577 GY Switch #1 to Medium Press Sol #2
151 GN Aux Ckt C578 YL Radio Switch to Radio
152 BU Aux Ckt C592 WH Diode to Blade Relay
154 RD Aux Ckt
168 RD Aux Ckt 607 PK Flood Lamp - Front
172 RD Aux Ckt 615 YL Cab Flood Lamp
173 YL Aux Ckt 616 BU Boom Flood Lamp
176 YL Aux Ckt 633 BU Atch Lighting Ckt
177 RD Main Brkr 638 WH Rotary Beacon
178 GN Main Brkr
179 BU Aux Ckt 763 BU Torque Converter SW
180 GN Aux Ckt 786 GN Eng Speed Cont - Hi Press SW
185 YL Aux Ckt 788 YL Eng Speed (+)
189 RD Aux Ckt 791 RD Eng Speed Cont - Lo Sol
191 WH Aux Ckt A718 PU Start Aid Coolant Sensor Signal
196 BU Aux Ckt A755 PK Throttle SW #1
A756 BU Throttle SW #2
200 BK Main Chassis A757 GY Throttle SW #3
201 BK Operator Monitor Return A758 BR Throttle SW #4
210 BK Converter Output A761 PU Electronic Pump Cont
235 BK Electronic Pump Ctrl Gnd A762 PU Electronic Pump Cont
A768 BU Pump Control Valve #1 (+)
304 WH Starter Relay No.1 Output A769 GY Pump Control Valve #2 (-)
306 GN Starter Relay Coil To Neut Start A770 PK
Electronic Pump Control Bypass SW
307 OR Key SW To Neut Start A771 PU Float SW
308 YL Main Power Relay Coil F771 OR Backup SW
309 GY Alternator Regulator Terminal F772 WH Backup SW
310 PU Start Aid SW To Start Aid Sol F773 OR Governor Accel
320 RD Horn Relay Coil To SW F774 WH Governor Decel
321 BR Travel Alarm J709 PK Alt Pulse Signal to Anti-Start Relay
322 GY Warning Horn (Forward) 877 YL Glow Plug Magnetic SW To Glow Plug
323 WH Fuel Pump Power 954 GN Hammer SW A
325 PK Fuel Pump Relay Cut-Out 955 BU Hammer Sol A
327 PK Shutdown Sol K904 GN Pump Discharge Signal
330 YL Neutral Start Relay Coil K905 RD Pump Discharge (+) B
365 YL Fuel Pump Relay To Switch K906 GN Swing Brake Sol Signal
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 (+)
496 WH Opr Mon Panel Hyd Oil Level L970 GY
Electronic Pump Control To Switch
Common Return
C468 BU Engine Oil Level L971 GN
Electronic Pump Control To Travel
Pressure Switch
H414 YL Warning Switch to Alarm L972 BU Low Idle SW
H415 BR Alarm to Warning Pressure Switch L974 GN Electronic Pump Ctrl Boom Raise Press SW
L975 PK Start Aid Control Lamp Output
L976 GN Excavator Fuel Pump Switch
L977 YL Trenching Sol
L978 GY Level Finish Sol
8630 BU Lamp Relays
Accessory Circuits
Lighting Circuits
Control Circuits
Ground Circuits
Basic Machine Circuits
Monitoring Circuits
Power Distribution Circuits
Related Electrical Service Manuals
Form No.
RENR1998
RENR1044
Title
Engine/Pump Control
Starting And Charging
Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
A/C Unit H-6 1 Relay - Refueling 2 B-2 20
Actuator - Engine Governor D-9 2 Relay - Start H-7 D
Alarm - Travel D-9 4 Relay - Starter Control J-8 D
Alternator C-8 5 Relay - Timer J-7 D
Batteries F-9 6 Resistor - Backup H-9 D
Breaker - 1 H-9 D Sender - Coolant Temperature C-8 21
Breaker - 2 H-9 D Sender - Hydraulic Oil Temperature B-7 13
Breaker - 3 H-9 D Sensor - A/C Photo F-2 E
Breaker - Battery H-9 D Sensor - Coolant Temperature C-8 24
Control - Heater Unit J-8 D Sensor - Fuel Level A-2 22
Control - Wiper E-2 E Sensor - Pump Discharge Pressure A-7 23
Controller - Engine/Pump C-4 7 Solenoid - A/C Compressor Clutch B-8 5
Converter - Voltage B-5 8 Solenoid - Engine Shutdown A-9 11
Fuses J-4,5,6 B Solenoid - Engine/Pump Control A-7 25
Glow Plugs B-9 3 Solenoid - Hammer G-2 F
Ground - Cab A-6 A Solenoid - Hydraulic Lock G-2 F
Ground - Chassis B-3 9 Solenoid - Level Finish A-7 25
Ground - Platform D-5 F Solenoid - Swing Brake A-2 27
Ground - Platform G-3 F Solenoid - Travel Speed A-7 25
Ground - Platform G-6 F Solenoid - Trenching A-7 25
Ground - Relay Panel H-8 D Solenoids - Medium Pressure Valve B-7 28
Ground Strap - Chassis to Platform G-6 10 Switch - Air Cleaner D-8 29
Ground Strap - Disconnect Switch to Chassis G-9 D Switch - Aux E-4 C
Ground Strap - Engine to Chassis A-8 11 Switch - Backup EPR Valve D-4 C
Heater H-6 1 Switch - Backup Governor D-5 C
Horn - Forward C-2 12 Switch - Boom Raise Pressure C-7 13
Indicator - Hydraulic Oil Filter B-7 13
Switch - Coolant Level
E-9 26
Joystick - Multiswitch (LH) H-2 B Switch - Disconnect G-9 D
Joystick - Multiswitch (RH) F-3 C Switch - Engine Oil Level A-9 30
Meter - Service F-2 E Switch - Engine Oil Pressure B-8 31
Monitor F-2 E Switch - Hammer Pressure G-2 F
Motor - Lower Wiper H-2 14 Switch - Hydraulic Oil Level B-7 13
Motor - Starter A-9 15 Switch - Implement Pressure C-7 32
Motor - Upper Wiper G-1 16 Switch - Key Start E-3 C
Motor - Washer F-9 D Switch - Neutral Start Limit J-2 B
Panel - Switch F-3 C Switch - Overload Warning E-5 C
Pickup - Engine Speed B-8 17 Switch - Overload Warning Pressure D-2 F
Pump - Auto Lubrication E-9 18 Switch - Radio E-4 C
Pump - Refueling B-2 19 Switch - Refrigerant Low Pressure B-8 26
Relay - Aux Hydraulic J-9 D Switch - Refueling A-2 33
Relay - Boom Lamp J-9 D Switch - Refueling Start (NO) B-2 34
Relay - Cab/Chassis Lamp J-9 D Switch - Refueling Stop (NC) B-2 34
Relay - Heater H-7 D Switch - Rotating Beacon E-4 C
Relay - Heater J-7 D Switch - Seat Heater E-4 C
Relay - Horn J-9 D Switch - Throttle E-3 C
Relay - Hydraulic Lock Solenoid J-9 D Switch - Travel Pressure C-7 28
Relay - Main H-7 D Switch - Windshield E-2 A
Relay - Neutral Start J-7 D Timer - Engine Shutdown H-7 D
Relay - Refueling 1 B-2 20
Machine locations are repeated for components located close together.
A = Located in the operator’s compartment.
B = Located in operator’s left hand console area.
C = Located in operator’s right hand console area.
D = Located in relay panel area.
E = Located in dash area.
F = Located under cab floorplate.
Resistor, Sender and Solenoid Specifications
Part No. Component Resistance (Ohms)¹
4I-5394 Sender - Hydraulic Oil Temp 6130 to 7500
102-8015 Resistor - Backup 41.0 ± 2.05
111-9916 Solenoid - Engine/Pump Control 11.7 ± 1.2
121 -1490
Solenoid - Level Finish
Trenching
32.0 ± 3.2
121 -1491
Solenoid - Hydraulic Lock
Swing Brake
Travel Speed
32.0 ± 3.2
¹ At room temperature.
Off Machine Switch Specification
Part No. Function Actuate Deactuate Contact Position
106-0179
Implement Pressure
Travel Pressure
1225.00 ± 98.00 kPa
(177.67 ± 14.21 psi)
882.00 kPa MIN
(127.92 psi MIN)
Normally Open
106-0180 Boom Raise Pressure
2646.00 ± 196.00 kPa
(383.77 ± 28.43 psi)
2156.00 ± 196.00 kPa
(312.70 ± 28.43 psi)
Normally Open
106-0181 Hammer Pressure
490.00 ± 49.00 kPa
(71.07 ± 7.11 psi)
290.00 kPa MIN
(42.06 psi MIN)
Normally Open
114-5333 Refrigerant Pressure (AC)
275 to 1750 kPa ¹
(40 to 255 psi)
-
-
Normally Open ²
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 (25psi).
Connector Location¹
Connector Number
Schematic
Location
Machine
Location
CONN 1 Service H-9 D
CONN2 D-8 D
CONN3 D-8 D
CONN4 D-7 D
CONN5 G-8 D
CONN6 G-8 D
CONN7 G-8 D
CONN 8 G-7 D
CONN9 C-6 10
CONN10 C-6 10
CONN11 C-5 10
CONN12 C-5 10
CONN13 E-6 F
CONN14 E-6 F
CONN15 E-6 F
CONN16 F-6 F
CONN17 B-5 F
CONN18 B-5 F
CONN19 C-5 F
CONN 20 C-5 35
CONN 21 H-5 F
CONN 22 H-5 F
CONN 23 H-5 F
CONN24 H-4 F
CONN25 H-4 F
CONN 26 D-3 F
CONN 27 A-2 33
CONN 28 B-2 34
CONN 29 B-2 34
CONN 30 B-2 19
CONN 31 C-2 36
CONN 32 D-2 F
¹The connectors shown in this chart are for harness to harness connectors.
Connectors that join a harness to a component are generally located at or near the
component. See the Component Location Chart.
A
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
35
33
34
36
7
F
E49298
A
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
35
33
34
36
7
F
Machine Harness Connector And Component Locations
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
172-RD-18
189-RD-14
320-OR-18
154-RD-18
151-GN-18
150-RD-18
114-RD-18
168-RD-14
115-RD-14
149-PU
140-BU
177-RD-10
111-RD-14
519-PK-18
8630-BU-18
K906-GN-18
F773-OR-18
F774-WH-18
A770-PK-18
A769-GY-18
A768-BU-18
791-GN-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
L970-GY-18
A
BB
A A
A
L975-PK-18
139-OR
615-YL
111-RD-14
177-RD-10
151-GN-18
149-PU
115-RD-14
114-RD-18
154-RD-18
320-OR-18
786-GN-18
791-RD-18
A770-PK-18
A588-GN-18
8630-BU-18
K909-BU-18
189-RD-14
412-BU-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-18327-PK-14
877-YL-8
405-GY-18
C468-BU-18
519-PK-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
506-PU-18
788-YL-18
519-PK-18
BK/PK
BK
321-BR-18
200-BK-18
506-PU-18
200-BK-18
412-BU-18
ATCH
TRAVEL ALARM
3E-7738 B
COOLANT
LEVEL SW
096-0744
MOTOR
WASHER
7T-8890
CC
BB
AA
200-BK-18
412-BU-18
487-OR-18
140-BU
BATTERY
3T-5760
POS
NEG NEG
POS
L971-GN-18
A
ON(KEY)
GROUND
2
1
ATCH AUTO
LUBRICATION PUMP
127-5264
RD-00RD-00BK-00
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
9 8 7 6 5 4 3 2
1
PLATFORM
PLATFORMCHASSIS
GROUND STRAP
7G-1060
200-BK-18
200-BK-14
519-PK-18
200-BK-14
103-RD-18
103-RD-18
191-WH
120-YL
152-BU
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
114-RD-18
139-OR
151-GN-18
154-RD-18
320-OR-18
189-RD-14
172-RD-18
124-RD-14
C538-OR-18
C537-GN-18
103-RD-18
103-RD-18
172-RD-18
189-RD-14
320-OR-18
154-RD-18
151-GN-18
139-OR
114-RD-18
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
C577-GY-18
152-BU
118-GY
129-BU
110-RD-14
185-YL-18
FUSE
5A 139-5345
10A 9W-1442
15A 9W-1441
111-RD-14
A
H
168-RD-14
HYD LOCK SOL
173-YL-18
A
H
H
HH
154-RD-18
189-RD-14
10
12
11
2
3
4
5
9
8
150-RD-18
OPERATOR STATION
10A
10A
15A
5A
15A
5A
15A
10A
191-WH-14
120-YL
DOME LAMP
10A
10A
10A
10A
15A
ACC CONVERTER
189-RD-14
5A
K905-RD
151-GN-18
5A
CIGAR LIGHTER
114-RD-18
115-RD-14
BOOM LAMP
REFUELING PUMP
140-BU
SEAT HEATER
110-RD-14
120-YL
149-PU
139-OR-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
114-RD-18
HORN
7
6
5A
177-RD-10
124-RD-14
103-RD-18
10A
10A
10A
15A
10A
320-OR-18
200-BK-18
5A
K905-RD
200-BK-18
FUSE BASE
111-4812
172-RD-18
140-BU
129-BU
149-PU
168-RD-14
173-YL-18
139-OR-18
ENG GOV
C576-BU-18
C592-WH-18
AUX CKT
147-PU176-YL
AUX CKT
179-BU-10
110-RD-14
TIMER RELAY
WASHER/WIPER
118-GY
AUX CKT
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
A
H H
A
320-OR-18
FFFF
152-BU
110-RD-14
10A
BACKUP
185-YL-18
1
L25
L25
L18
L17
185-YL-18
HH
H
K909-BU-18
A
A
7
8
1
6
5
4
3
2
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
GA
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
135-BU
C578-YL
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
173-YL-18
308-YL-18
185-YL-18
152-BU
615-YL-18
191-WH
955-BU-18
A768-BU-18
A769-GY-18
A770-PK-18
F774-WH-18
F773-OR-18
K906-GN-18
8630-BU-18
105-RD
113-OR-18
791-RD-18
786-GN-18
135-BU
C578-YL
152-BU-18
8630-BU-18
191-WH-18
A586-OR-18
501-GN-18
590-GY-18
A755-PK-18
A756-BU-18
A757-GY-18
A758-BR-18
105-RD
307-OR-18
308-YL-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
152-BU
200-BK-18
615-YL-18
K909-BU-18
K907-BU-18
200-BK-18
L969-WH-18
A770-PK-18
L968-OR-18
135-BU
A769-GY-18
A768-BU-18
A769-GY-18
C578-YL
A768-BU-18
615-YL-18
615-YL-18
K906-GN-18
173-YL-18
185-YL-18
185-YL-18
L968-OR-18
200-BK-18
F771-OR-18
F773-OR-18
L969-WH-18
A537-PK-18
F774-WH-18
615-YL-18
615-YL-18
11
8
F772-WH-18
GG
5
A770-PK-18
786-GN-18
K906-GN-18
2
12
10
K907-BU-18
9
185-YL-18
7
6
4
A537-PK-18
3
1
185-YL-18
3
2
1
173-YL-18
135-BU
200-BK-18
BACKUP EPR VALVE SW
114-0421
200-BK-18
200-BK-18
GG
BACKUP
GOV SW
110-7884
K909-BU-18
200-BK-18
K909-BU-18
791-RD-18
113-OR-18
173-YL-18
A586-OR-18
501-GN-18
590-GY-18
K909-BU-18
955-BU-18
F773-OR-18
F774-WH-18
A770-PK-18
A769-GY-18
A768-BU-18
K906-GN-18
8630-BU-18
791-RD-18
786-GN-18
152-BU-18
185-YL-18
113-OR-18
615-YL-18
191-WH-18
135-BU
C578-YL
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
8630-BU-18
152-BU-18
200-BK-18
615-YL-18
615-YL-18
8630-BU-18
152-BU-18
ATCH-AUX SW
ATCH-RADIO SW
132-1828
F771-OR-18
G
ATCH-SEAT
HEATER SW
111-4783
200-BK-18
200-BK-18
ATCH-ROTATING
BEACON SW
L17
L16
L12
L9
C
B
A
GY
PU
BR
RED
WHITE
ORANGE
YELLOW
PINK
ABBREV COLOR
BLACK
GRAY
PURPLE
BROWN
BK
PK
YL
OR
WH
RD
GN
BU
GREEN
BLUE
ENG/PUMP CONT
145-3088
151-9367 ATCH
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
ALTERNATOR (R TERM)
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)
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
L10
L9
L9
L1
ATCH-CONDITIONER GP
152-5085 NOTE G
3
6
1
4
5
2
C537-GN-18
579-BR-14
C538-OR-18
519-PK-18
200-BK-14
A
152-BU-18
C576-BU-18
C577-GY-18
C577-GY-18
C576-BU-18
A588-GN-18
C592-WH-18
6
5
4
3
2
1
A
H
8
7
120-YL
A588-GN-18
C592-WH-18
C592-WH-18
C577-GY-18
C576-BU-18
A588-GN-18
954-GN-18
955-BU-18
118-GY
A588-GN-18
524-BU
L19
L7
519-PK-18
C537-GN-18
200-BK-14
OPERATOR STATION
A
200-BK-14
579-BR-14
2
5
4
A
200-BK-18
A588-GN-18
HYD LOCK SOL
121-1491
2
1
1
6
H
200-BK-18
320-OR-18
NEUTRAL START
LIMIT SW
111-4799
150-RD-18
151-GN-18
154-RD-18
A588-GN-18
A588-GN-18
H
H
H
H
H
HORN SW
MED PRESS SW
MED PRESS SW
H
YL
GN
BU
RD
GY
BK
MULTISWITCH JOYSTICK-LH
122-4829
ATCH
HAMMER
PRESS. SW
106-0181
955-BU-18
954-GN-18
200-BK-18
A
C576-BU-18
954-GN-18
200-BK-18
C577-GY-18
C
PLATFORM
200-BK-18
A588-GN-18
B
200-BK-18
A
L25
118-GY
524-BU
118-GY
MOTOR
-
S
+
524-GN
200-BK
A
118-GY
524-BU
200-BK
C
LOWER
WIPER MOTOR
131-0398
B
A
1
2
ATCH HAMMER SOL.
121-6303
955-BU-18
200-BK-18
A
2
1
200-BK-18
200-BK-18
200-BK-18
200-BK
200-BK
L7
L7
3
200-BK
615-YL
615-YL
200-BK
5
4
3
2
1
OPERATOR STATION
200-BK
524-GN
L3
L3
615-YL
615-YL
E
118-GY
524-BU
200-BK
C
+
S
B
-
MOTOR
A
L LE
1
2
GND
+B
L CHASSIS
L BOOM
WASH
W LOW
W INT
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
A586-OR-18
501-GN-18
SWITCH PANEL
111-4800
9G-7641
R
C
6
S
B
OFF
ON
ST
590-GY-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
2
1
U
U
L27
200-BK-18
H415-BR-18
PRESS. SW
2
3
1
H415-BR-18
200-BK-18
H415-BR-18
200-BK-18
OVERLOAD WARNING PRESSURE
SW 144-3614
A
L27
T
T
L4
L3
L5
ATCH CAB LAMP
5I-8250
UPPER
WIPER MOTOR
131-0399
E
L4
L3
L
Y/G
Y/W
200-BK-18
118-GY
615-YL-18
A586-OR-18
501-GN-18
K912-GN-18
201-BK-18
103-RD-18
200-BK-18
K911-PK-18
590-GY-18
200-BK-18
403-GN-18
129-BU-18
C538-OR-18
C537-GN-18
200-BK-14
200-BK-18
201-BK-18
200-BK-18
K997-BU-18
L
200-BK-14
200-BK
506-PU
GND IN
WASH SW
+ 24 IN
MOT WASH
WIPER SW
OUTPUTS
INTER SW
WIND SW
4
6
9
3
500-BR-18
7
L4
D
CAB
D
D
+
GND
LIGHT
RS485-
+B
MAIN
RS485+
1
8
5
2
200-BK
524-BU
500-BR-18
WIPER CONT
127-9838
D
D
WINDSHIELD SW
9G-2795
MONITOR
151-9385
PROVISION FOR
A/C PHOTO
SENSOR
128-2163 (NOTE G)
-
SERVICE
METER
6T-7337
D
955-BU-18
152-BU
K905-RD
129-BU-18
103-RD-18
118-GY
103-RD-18
185-YL-18
105-RD
173-YL-18
113-OR-18
118-GY
191-WH
C537-GN-18
C538-OR-18
955-BU-18
120-YL
524-BU
524-BU
MULTISWITCH JOYSTICK-RH
122-4828
H415-BR-18
H415-BR-18
954-GN-18
615-YL-18
524-BU
2
1
200-BK-18
200-BK-18
200-BK-18
200-BK-18
955-BU-18955-BU-18
L972-BU-18 L972-BU-18
H415-BR-18
H414-YL-18
H414-YL-18
A537-PK-18
G
H414-YL-18
H415-BR-18
G
ATCH OVERLOAD
WARNING BUZZER
113-4683
191-WH-18
191-WH-18 191-WH-18
A537-PK-18
A537-PK-18
200-BK-18
ATCH
SEAT WITH
SEAT HEATER
111-6458
G
L6
118-GY
L27
H414-YL-18
191-WH-18
200-BK-18
L15
L13
L18
ATCH-OVERLOAD
WARNING SW
132-1828
G
191-WH-18
H414-YL-18
615-YL-18
615-YL-18
200-BK-18
L14
200-BK-18
200-BK-18
200-BK-14
200-BK-14
235-BK
PLATFORM
L26
L27
200-BK-18
H415-BR-18
C578-YL
135-BU
118-GY
615-YL-18
638-WH
L970-GY-18
506-PU-18
615-YL-18
615-YL
120-YL
103-RD-18
118-GY
103-RD-18
129-BU
K905-RD
C538-OR-18
C537-GN-18
524-BU
524-BU
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
954-GN-18
615-YL-18
954-GN-18
L970-GY-18
200-BK-18
L10
L11
L12
L9
L13
L11
L14
118-GY
200-BK-14
VV
200-BK-14
590-GY-18
501-GN-18
129-BU-18
403-GN-18
K911-PK-18
K912-GN-18
103-RD-18
615-YL-18
A586-OR-18
C537-GN-18
C538-OR-18
K997-BU-18
200-BK-14
OPERATOR STATION
615-YL-18
SPEAKER LH-
SPEAKER LH+
SPEAKER RH-
SPEAKER RH+
+12V LIGHT
GROUND
MEMORY +12V
509-WH-18
508-PU-18
512-GN-18
511-BR-18
633-BU-18
210-BK
508-PU-18
C578-YL
B+ 12V
512-GN-18
511-BR-18
509-WH-18
139-OR-18
7
8
4
3
5
2
6
1
ATCH
AM/FM RADIO
LIGHT IN (DC24V)
4
615-YL-18
12V SW OUT
GND
8
7
6
5
3
2
1
200-BK
+24V BAT IN MEM
LIGHT OUT (DC12V)
+12V MEM OUT
+24V SW IN
GND
120-YL
135-BU
210-BK
139-OR-18
633-BU-18
103-RD-18
CONVERTER
1310327
12V 7A
200-BK
9
8
7
11
3
6
10
1
2
5
4
12
2
1
615-YL
615-YL
200-BK
524-BU
638-WH
200-BK
1
A
2
1
524-BU
2
135-BU
210-BK
12V SOCKET
9R-7941
524-BU
118-GY
615-YL
103-RD-18
200-BK-18
LUNCH BOX LIGHT
506-PU
120-YL
C578-YL
103-RD-18
135-BU
118-GY
CAB
2
3
4
5
6
1
8
7
ATCH SPEAKER(L)
7Y-5505
ATCH SPEAKER(R)
7Y-5505
7
6
5
4
3
8
1
2
200-BK-18
A
A A
ANTENNA
6C-3431
L26
FOR ATCH
ROTATING BEACON
L4
L3
E
E
E
E
E
E
E
E
D
200-BK
200-BK-18
AUX- HYD
RELAY
111-4871
200-BK-18
L970-GY-18
C592-WH-18
103-RD-18
D
200-BK-18
638-WH
200-BK
C592-WH-18
D
E
638-WH
L970-GY-18
C577-GY-18
C576-BU-18
200-BK-18
327-PK-14
168-RD-14
GND
ON (KEY)
SOLENOID
+ BATTERY
BK-20
GN-20
BU-14
RD-14
ENG
SHUTDOWN
TIMER
138-5190
200-BK-18
200-BK-18
ZZ
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF.
THIS SCHEMATIC IS FOR THE 315B/318B-HYD EXCAVATOR.
CC
BB
AA
CABLE AS.
XX
WIRE AS.
L
K
H
G
E
D
C
B
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.
NOTE B : USE WITH COLD WEATHER.
N
WW
R
S
BK
YL
A
C592-WH-18
200-BK-18
200-BK-18
325-PK-18
200-BK-18
200-BK-18
616-BU
322-GY-18
607-PK-14
168-RD-14
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
DIODE
121-1022
309-GY-18
308-YL-18
C577-GY-18
306-GN-18
C576-BU-18
168-RD-14
327-PK-14
200-BK-18
325-PK-18
495-GN-18
200-BK-18
L970-GY-18 L970-GY-18
SS
TT
RR
ZZ
YY
VV
UU
UU
TT
PP
NN
SS
WW
YY
8630-BU-18
196-BU
INSP LAMP
200-BK-18
179-BU-10
189-RD-14
113-OR-18
C576-BU-18
C592-WH-18
DIODE
121-1022
579-BR-14
A588-GN-18
113-OR-18
172-RD-18
173-YL-18
200-BK-18
DIODE
121-1022
113-OR-18
C592-WH-18
C577-GY-18
177-RD-14
308-YL-18
SWITCH PANEL
113-OR-18
579-BR-14
308-YL-18
B
M
MM
325-PK-18
179-BU-10
178-GN-10
113-OR-18
BK
GY
D
RD
BU
GN
D
YL
G
HAMMER SW
RIGHT SW
LOW IDLE AND
PRESS. RAISE SW
G
G
G
191-WH-18
118-GY
L972-BU-18
200-BK-18
L6
D
CIGAR
LIGHTER
9W-0335
308-YL-18
308-YL-18
101-RD-8
200-BK-18
308-YL-18
DIODE
121-1022
308-YL-18
K909-BU-18
200-BK-18
308-YL-18
177-RD-10
101-RD-6
112-PU-6
308-YL-18
308-YL-18
112-PU-6
105-RD
173-YL-18
177-RD-10
PP
RR
TT
129-BU
VV
XX
L21
179-BU-10
L1
1
6
7
8
9
5
4
3
2
11
12
10
200-BK-18
C592-WH-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
308-YL-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
139-OR
151-GN-18
111-RD-14
307-OR-18
BREAKER 3
139-4724
C592-WH-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-OR-18
114-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
139-OR-18
A588-GN-18
L970-GY-18
791-RD-18
114-RD-18
320-OR-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
HH
178-GN-10
196-BU
129-BU
178-GN-10
196-BU
185-YL-18
152-BU
118-GY
AUX CKT
120-YL
191-WH-14
140-BU
139-OR-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
6T-3645
OUT 1
OUT 2
+B
IN 1
GND
IN 2
C 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
MM
NN
L23
4
2
3
1
C577-GY-18
168-RD-14
638-WH
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
C576-BU-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
T
BK
1
YL
2
5
327-PK-14
877-YL-8
C468-BU-18
179-BU-10
178-GN-10
325-PK-18
L1
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
B
101-RD-6
MOTBAT
GS
RD-00
B
ENG SPEED
PICKUP
125-2966
A762-PU-18
RD-00
AA
HH
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
TEMP SENSOR
125-2982
B
2
1
200-BK-18
BB
B
B
B
200-BK-18
403-GN-18
109-RD-6
J703-PK-18
200-BK-18
513-OR-18
B
309-GY-18
B
B
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-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
4
L20
L19
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
519-PK-18
200-BK-18
J703-PK-18
309-GY-18
109-RD-6
101-RD-6
A718-PU-18
ATCH
A/C CLUTCH SOL.
117-6353
L1
304-WH-8
124-RD-14
114-RD-18
110-RD-14
115-RD-14
200-BK-18
BB
BK-00
RD-00 RD-00
POS
NEGNEG
POS
BATTERY
3T-5760(NOTE B)
GG
BB
HH
321-BR-18
495-GN-18
K906-GN-18
168-RD-14
607-PK-18
322-GY-18
616-BU
6
2
1
7
GG
134-3275
116-0080
134-3274
134-3298
105-9917
G-9
F-9
F-9
E-9
E-9
8
9
10
11
139-OR
ATCH REFRIGERANT
LOW PRESS. SW
114-5333 (NOTE A)
1
2
B
519-PK-18
513-OR-18
200-BK-18
200-BK-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
7T-0970
CHASSIS
ATCH
REFUELING
PUMP
123-3928
ATCH
REFUELING
START SW(NO)
6T-9442
R
N
N
FF
HORN
7Y-3919
K
K
200-BK-18
323-WH-14
A718-PU-18
+
113-OR-18
A588-GN-18
179-BU-10
178-GN-10
309-GY-18
616-BU
308-YL-18
307-OR-18
579-BR-14
124-GN-14
C577-GY-18
200-BK-18
1
2
B
C578-YL
200-BK-14
HEATER GP
144-3680
DD
BK-00
168-RD-14168-RD-14
327-PK-14327-PK-14
322-GY-18
607-PK-18
C592-WH-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
139-OR-18
115-RD-18
A588-GN-18
791-RD-18
607-PK-18
615-YL
151-GN-18
139-OR-18
200-BK
CAB/CHASSIS
LAMP RELAY
111-4871
A588-GN-18
K909-BU-18
6
1
115-RD-14
115-RD-14
2
BB
189-RD-14
114-RD-18
5
4
5
60A
320-OR-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
114-RD-18
124-RD-14
308-YL-18
110-RD-14
320-OR-18
114-RD-18
124-RD-14
K909-BU-18
K909-BU-18
30A
BAT. BREAKER
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-OR-18
322-GY-18
114-RD-18
BUS-BAR
149-5068
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
7T-0969
ATCH MEDIUM PRES.
147-0410
B
2
325-PK-18 325-PK-18
1
2
HEATER RELAY
9X-8124
2
1
1
200-BK-18
A588-GN-18
325-PK-18 325-PK-18
C
2
1
HORN
7Y-3920
638-WH
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
SS
UU
200-BK-18
L23
L22
L17
L16
308-YL-18
L10
L14
C592-WH-18
L970-GY-18
L4
L1
N
403-GN-18
309-GY-18
N
CHECK TERM.
C576-BU-18
C577-GY-18
519-PK-18
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
309-GY-18
L908-OR
L909-BU
235-BK
E
D
C
B
A
235-BK
L909-BU
309-GY-18
CONNECTOR
L908-OR
L909-BU
L908-OR
235-BK
310-PU-18
200-BK-18
GROUND STRAP
134-3344
309-GY-18
403-GN-18
308-YL-18
110-RD-14
PP
NN
XX
WW
HEATER RELAY
111-4871
YY
150-6938
150-6934
150-6936
150-6937
150-6943
150-6942
150-6940
132-1827
150-6944
150-6941
150-6939
150-6935
G-7
G-7
G-7
G-7
G-7
G-7
H-8
A-2
G-7
G-7
H-8
G-7
NOTE G : USE WITH A/C UNIT.
200-BK-18
L21
L23
CC
RELAY PANEL
J703-PK-18
STRAP AS.
DD
NOTE A : NORMALLY OPEN BEFORE REFRIGERANT CHARGE.
EE
7G-1060
134-3344
134-3355
G-6
G-9
A-9
C576-BU-18
306-GN-18
330-YL-18
DOME LAMP
096-0721
HH
616-BU
200-BK
U
137-1840
140-0920
156-4092
156-4091
144-9617
130-6568
156-4090
156-4088
146-7251
116-0096
116-0098
156-4086
145-0573
144-3080
144-7629
G-1
C-2
H-4
E-4
B-6
B-5
G-8
A-2
B-2
B-2
B-3
G-3
C-2
D-2
D-2
(132-1887 CHG H01)
E49430
UNLESS OTHERWISE SPECIFIED ALL WIRE IS 16 GAUGE.
KEY START SW
TO MACHINE STRUCTURE
C538-OR-18
200-BK-18
200-BK-6
A588-GN-18
139-OR-18
SERVICE
COOLANT
CONN 1
CONN 5
CONN 6
CONN 7
CONN 8
CONN 21
CONN 23CONN 22
CONN 24 CONN 25
CONN 16
CONN 15
CONN 14
CONN 13
CONN 2 CONN 3 CONN 4
CONN 9 CONN 10
CONN 11
CONN 12
CONN 17
CONN 18
CONN 19
CONN 20
CONN 32
CONN 26
CONN 28
CONN 29
CONN 31
CONN 30
CONN 27
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.
STARTING CIRCUIT.
GAUGE CIRCUIT.
MONITORING SYSTEM CIRCUIT.
WIPER/WASHER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
AIR INLET HEATER CIRCUIT.
ENGINE/PUMP CONTROL CIRCUIT.