315B EXCAVATOR ELECTRICAL SCHEMATIC USED IN SERVICE MANUAL RENR1120

©1999 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR1132-01
October 1999
315B and 315B L Excavators
Electrical System
315B:
1SW1-UP
2DW1-UP
315B L:
3AW1-UP
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.
Related Electrical Service Manuals
Title Form Number
Engine / Pump Control RENR1998
Starting and Charging RENR1044
Schematic
Location
Machine
Location
CONN 1 B-4 7
CONN 2 C-4 7
CONN 3 SIS Connector H-9 D
CONN 4 G-9 D
CONN 5 G-8 D
CONN 6 G-8 D
CONN 7 D-8 D
CONN 8 D-8 D
CONN 9 D-7 D
CONN 10 G-7 D
CONN 11 F-6 G
CONN 12 E-6 G
CONN 13 E-6 G
CONN 14 E-6 G
CONN 15 B-6 A
CONN 16 B-6 A
CONN 17 B-6 A
CONN 18 B-5 A
CONN 19 B-5 G
CONN 20 C-5 G
CONN 21 C-5 G
CONN 22 C-5 7
CONN 23 H-5 43
CONN 24 H-5 G
CONN 25 H-5 G
CONN 26 H-5 G
CONN 27 H-4 G
CONN 28 H-4 G
CONN 29 A-3 41
CONN 30 B-3 29
CONN 31 H-3 G
CONN 32 J-3 42
CONN 33 C-2 32
CONN 34 B-2 17
CONN 35 B-2 19
The 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.
Connector Number
Connector Location
Component Location
Component Schematic
Location
Machine Location Component Schematic Location Machine Location
Actuator - Eng Governor D-9 27 Resistor - Main Relay H-9 D
Air Heater B-9 3 Seat With Seat Heater F-5 28
Alarm - Travel D-9 3 Sender - Coolant Temp C-8 22
Alternator C-8 4 Sender - Hydraulic Oil Temp B-7 E
Antenna A-6 5 Sensor - A/C Photo F-2 A
Battery E-9, F-9 6 Sensor - AIH Coolant Temp C-8 21
Block - Terminal G-7 D Sensor - Engine Speed Pickup B-8 25
Breaker 1 G-9 D Sensor - Fuel Level A-2 23
Breaker 1 - Bat G-9 D Sensor - Pump Discharge Press A-7 24
Breaker 2 G-9 D Solenoid - Air Conditioner Clutch B-8 26
Breaker 2 - Bat H-9 D Solenoid - Eng/Pump Cont A-7 F
Breaker 3 H-9 D Solenoid - Engine Shutdown A-9 27
Control - Eng/Pump B-4, C-4 7 Solenoid - Hydraulic Lock H-2 G
Control - Power Window B-6 15 Solenoid - Level Finish A-7 F
Control - Wiper E-2 A Solenoid - Swing brake A-3 32
Converter J-3 8 Solenoid - Travel Speed A-7 F
Converter - 12V 5A H-5 9 Solenoid - Trenching A-7 F
Fuse - Block J-4, J-5, J-6 C Speaker B-6 33
Glow Plug A-9, B-9 2 Switch - Air Cleaner D-8 35
Horn C-2 10 Switch - Aux Hydraulic G-2 G
Indicator - Hydraulic oil Filter B-7 E Switch - Backup EPR Valve D-4 C
Lamp - Boom C-1 11 Switch - Backup Gov D-5 B
Lamp - Cab G-1, H-1 12 Switch - Boom Raise Press C-7 34
Lamp - Chassis B-2 13 Switch - Coolant Level E-9 36
Lamp - Dome A-6 A Switch - Disconnect G-9 D
Lighter - Cigar F-2 A Switch - Engine Oil Level A-9 37
Meter - Service F-2 A Switch - Engine Oil Pressure B-8 38
Monitor F-2 A Switch - Hammer Press G-2 G
Motor - Lower Washer F-9 40 Switch - Horn H-1 C
Motor - Lower Wiper G-2 G Switch - Hydraulic Oil Level B-7 E
Motor - Starter B-8 14 Switch - Implement Swing Press C-7 39
Motor - Upper Wiper E-2 A Switch - Key E-3 B
Motor - Washer F-9 1 Switch - Lower Washer E-4 B
Pump - Auto Lubrication E-9 16 Switch - Lower Wiper E-4 B
Pump - Refueling B-2 17 Switch - Neutral Start Limit H-2 C
Radio J-3 C Switch - One Touch Low Idle F-3 B
Relay - Air Heater G-6 D Switch - Panel F-3 B
Relay - Boom Lamp J-9 D Switch - Power Window E-4 B
Relay - Chassis/Cab Lamp J-9 D Switch - Power Window Limit A-6, G-2 A
Relay - Fan J-7 D Switch - Refrigerant Low Press E-9 36
Relay - Heater H-7 D Switch - Refueling Level A-2 41
Relay - Horn J-9 D Switch - Refueling Start B-2 29
Relay - Hydraulic Lock Solenoid J-9 D Switch - Refueling Stop B-3 30
Relay - Main H-7 D Switch - Seat Heater D-5 B
Relay - Neutral Start J-7 D Switch - Throttle Position E-3 B
Relay - Refueling 1 B-2 19 Switch - Travel Press B-7 31
Relay - Refueling 2 B-2 20 Switch - Window Limit G-2 A
Relay - Start H-7 D Timer - Engine Shutdown H-7 D
Relay - Start Cont J-8 D Unit - Air Conditioner H-6 18
Relay - Timer J-7 D Unit - Air Heater Control J-8 D
Resistor - Backup J-9 D Unit - Air Heater Control ATCH H-6 D
Machine locations are repeated for components located close together.
A Located in the cab
B Located in the lefthand console
C Located in the righthand console
D Located on or near relay panel
E Located near hydraulic oil tank
F Located near pilot manifold
G Located on or near bottom platform
Off Machine Switch Specification
Part No. Function Actuate Deactuate Contact Position
106-0179
Implement Pressure
Travel Pressure
1520 ± 98 kPa
(220.4 ± 14 psi)
1127 kPa MIN
(163.5 psi MIN)
Normally Open
106-0180 Boom Raise Pressure
2646 ± 196 kPa
(383.8 ± 28.4 psi)
2156 ± 196 kPa
(312.7 ± 28.4 psi)
Normally Open
106-0181
Aux Hydraulic Pressure
Hammer Pressure
490 ± 49 kPa
(71.1 ± 7.1 psi)
290 kPa MIN
(42.1 psi MIN)
Normally Open
Resistor, Sender and Solenoid Specifications
Part No. Component Description Resistance (Ohms)¹
102-8015 Resistor: Backup 41 ± 2.1
163-6616 Resistor: Main Relay
(1) 48 ± 2.4
(2) 48 ± 2.4
4I-5394 Sender: Hydraulic Oil Temperature 6134 to 7496
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 unless otherwise noted.
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 High (43Volts)
4102 Over-Current In The Proportional Reducing Valve
4103 Proportional Reducing Valve Circuit Is Open
4105 Over-Current In The Digital Output (Trenching Solenoid)
4106 Over-Current In The Digital Output (Fine Control Solenoid)
4107 Over-Current In The Digital Output (Travel Speed Change Solenoid)
4108 Over-Current In The Digital Output (Travel Alarm)
410A Over-Current In The 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 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
Real Time Error Codes
Wire Description
Wire Number Wire Color Description Wire Number Wire Color Description
Power Distribution Circuits
Accessory Circuits (cont'd)
101
RD
513
OR
A/C Compressor/Refrigerant Press SW
103
RD
Aux Ckt
519
PK
Thermostat To Refrigerant Press SW
105
RD
Key Sw
530
OR
Washer Right
109
RD
Alt Output (+) Term.
575
YL
Wiper - Aux (Park)
110
RD
Aux Ckt
576
PK
Wiper - Aux (Low)
111
RD
Aux Ckt
578
BU
Washer - Aux
112
PU
Main Power Rly Output
579
BR
A/C Blower Motor No. 1
113
OR
Opr Mon Panel B (+) Switched
590
GY
Wiper SW To Intermittent Module
115
RD
Aux Ckt
592
BU
DC/DC Converter Power Output
118
GY
Aux Ckt
A537
PK
Seat Heater (Resistive Element In Cushion)
120
YL
Aux Ckt
A513
RD
DC/DC Converter Memory Output
124
RD
A/C
A579
OR
Wiper Motor (+)
129
BU
Aux Ckt
A580
BR
Wiper Motor (-)
135
BU
Aux Ckt
A581
GN
Wiper Motor Raise
140
BU
Aux Ckt
A582
PU
Wiper Motor Stop
147
PU
Aux Ckt
A583
YL
Power Window Interlock To Wiper Cont
149
PU
Aux Ckt
A584
BU
Front Window Limit SW To Wiper Cont
150
RD
A586
OR
Wiper SW To Wiper Cont
151
GN
Aux Ckt
A587
YL
Power Window Cont To Safety Sol Relay
152
BU
Aux Ckt
A588
GN
Safety Sol Relay To Sol
154
RD
Aux Ckt
A589
OR
Power Window Up
169
RD
Aux Ckt
A590
BU
Power Window Down
168
RD
Aux Ckt
A591
PU
Rear Window Limit SW
172
RD
Aux Ckt
C537
GN
A/C Photo Sensor (+) Sig
173
YL
Aux Ckt
C538
OR
A/C Photo Sensor (-) Sig
175
RD
Aux Ckt
Lighting Circuits
176
YL
Aux Ckt
607
PK
Flood Lamp - Front
177
RD
Main Brkr
615
YL
Cab Flood Lamp
178
GN
Main Brkr
616
BU
Boom Flood Lamp
179
BU
Aux Ckt
Control Circuits
180
GN
Aux Ckt
763
BU
Torque Converter SW
185
YL
Aux Ckt
786
GN
Eng Speed Cont - Hi Press SW
189
RD
Aux Ckt
788
YL
Eng Speed (+)
191
WH
Aux Ckt
791
RD
Eng Speed Cont - Lo Sol
196
BU
Aux Ckt
A718
PU
Start Aid Coolant Sensor Signal
Ground Circuits
A755
PK
Throttle SW #1
200
BK
Main Chassis
A756
BU
Throttle SW #2
201
BK
Operator Monitor Return
A757
GY
Throttle SW #3
235
BK
Electronic Pump Ctrl Gnd
A758
BR
Throttle SW #4
Basic Machine Circuits
A761
PU
Electronic Pump Cont
304
WH
Starter Relay No. 1 Output
A762
PU
Electronic Pump Cont
306
GN
Starter Relay Coil To Neut Start
A768
BU
Pump Control Valve #1 (+)
307
OR
Key SW To Neut Start
A769
GY
Pump Control Valve #2 (-)
308
YL
Main Power Relay Coil
A770
PK
Electronic Pump Control Bypass SW To Resistor
309
GY
Alternator Regulator Term.
A771
PU
Float SW
310
PU
Start Aid SW To Start Aid Sol
F771
OR
Backup SW
320
RD
Horn Relay Coil To SW
F772
WH
Backup SW
321
BR
Travel Alarm
F773
OR
Governor Accel
322
GY
Warning Horn (Forward)
F774
WH
Governor Decel
323
WH
Fuel Pump Power
J703
PK
Alt Pulse Sig To Anti-Start Relay
325
PK
Fuel Pump Relay Cut-Out
877
YL
Glow Plug Magnetic SW To Glow Plug
327
PK
Shutdown Sol
954
GN
Hammer SW A
330
YL
Neut Start Relay Coil
K904
GN
Pump Discharge Signal
365
YL
Fuel Pump Relay To Switch
K905
RD
Pump Discharge (+)
Monitoring Circuits
K906
GN
Swing Brake Sol Signal
403
GN
Alternator (R) Term.
K907
BU
Swing Brake Sol (+)
405
GY
Opr Mon Oil Press. (Low Setting)
K909
BU
Backup SW (+)
412
BU
Opr Mon Cool Flow
K911
PK
E/P Controller RS485 (+)
430
BU
Opr Mon Air Filter
K912
GN
E/P Controller RS485 (-)
487
OR
Hyd Oil Flow SW
K997
BU
(+) V Sensor
491
PK
Hyd Oil Temp Sensor
L908
OR
Controller RS-232C Tx
492
GY
Coolant Temp Sensor Signal
L909
BU
Controller RS-232C Rx
495
GN
Fuel Level Signal
L968
OR
Electronic Pump Control Ps Valve (-)
496
WH
Opr Mon Panel Hyd Oil Level
L969
WH
Electronic Pump Control Ps Valve (+)
C468
BU
Engine Oil Level
L970
GY
Electronic Pump Control To Switch Common RTN
Accessory Circuits
L971
GN
Electronic Pump Control To Travel Pressure SW
501
GN
Wiper - Front (Low)
L972
BU
Low Idle SW
506
PU
Washer - Front
L974
GN
Electronic Pump Ctrl Boom Raise Press SW
508
PU
Radio Speaker - Left
L975
PK
Start Aid Cont Lamp 1 Output
509
WH
Radio Speaker - Left (Commom)
L976
GN
Excavator Fuel Pump Switch
511
BR
Radio Speaker - Right
L977
YL
Trenching Sol
512
GN
Radio Speaker - Right (Common)
L978
GY
Level Finish Sol
3
4
5
6
8
9
10
11
12
14
15
13
16
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
39
40
41
42
43
44
33
12
11
10
3
11
12
28
30 29
19
10
13
17
33
15
5
9
8
18
7
20
32
23
41
34
31
39
35
1
40
22
21
24
4
14
38
25
26
3
6
16
3
36
2
27
37
42
43
44
45
45
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
PK
2
OR
3
6
5
4
2
1
140-BU
1
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 REFRIGERANT
LOW PRESS. SW
105-9344 (NOTE A)(NOTE F)
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
G
J
H
F
E
D
C
B
A
G
J
H
F
E
D
C
B
A
Y/W
Y/G
B
G
R/L
200-BK
9 8 7 6 5 4 3 2 1
9 8 7 6 5 4 3 2 1
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
OPERATOR STATION
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
154-0523(NOTE F)
130-0250(NOTE E)
6
1
3
HEATER UNIT
151-9680(NOTE F)
139-7258(NOTE E)
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-PU176-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
L25
L8
L19
L7
185-YL-18
HH 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
L15
L16
L12
L9
L12
L9
L11
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
171-2593
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
L11L12L13L14
L9
L15
L4
L3
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
OPERATOR STATION
ATCH
CAB LAMP
153-2521
ATCH
CAB LAMP
153-2521
140-0853
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
153-2444 (NOTE F)
153-2445 (NOTE E)
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
AM RADIO
136-4006 (NOTE F)
ATCH LOWER
WIPER MOTOR
113-3452
+
S +1
-
MOTOR
2
1
2
1
2
4
1
3
C
B
A
L8
L7
L25
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 G)
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
L2
L3
L4
L4
L3
D
AG
AF
AF
AG
AF
ATCH
AIR HEATER
168-5057
AF
AG
101-RD-4
877-YL-4
877-YL-4
101-RD-4
VV
101-RD-4
877-YL-4
RELAY PANEL
101-RD-4
877-YL-4
200-BK-18
REGULATOR
ATCH AIR
HEATER RELAY
116-0114
1
2
TEMP.
KEY SW.(ON)
GND
KEY SW.(START)
RELAY
CHECK TERM.
308-YL-18
ATCH
AIR HEATER
CONT UNIT
104-3204
200-BK-18
403-GN-18
310-PU-18
INDICATOR
306-GN-18
200-BK-18
403-GN-18
308-YL-18
306-GN-18
306-GN-18
310-PU-18
A718-PU-18
200-BK-18
308-YL-18
L975-PK-18
101-RD-10
169-RD-10
200-BK
AE
AD
AC
200-BK-18
ATCH
MAIN RELAY
RESISTOR
163-6616
(NOTE K)
ATCH
MAIN RELAY
159-9108
(NOTE K)
Y
(NOTE K)
Y
(NOTE K)
BLOCK
121-1023
BLOCK AS.
7Y-5499
169-RD-10
169-RD-10
AB
101-RD-6
AB
169-RD-10
BAT. BREAKER 2
139-4724
30A
169-RD-10
513-OR-18
JJ (NOTE E)
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
119-6828(NOTE F)
139-7207(NOTE E)
HEATER
SWITCH PANEL
119-6826(NOTE F)
139-7261(NOTE E)
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
ENG SHUTDOWN
TIMER
138-5190
530-OR-18
530-OR-18 A586-OR-18
530-OR-18
530-OR-18
530-OR-18
330-YL-18
306-GN-18
ZZ
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF.
THIS SCHEMATIC IS FOR THE 315B-HYD EXCAVATOR.
CC
BB
AA
CABLE AS.
XX
WIRE AS.
P
L
K
J
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
T
T
V
V
V
ATCH
CONVERTER
134-1346
A
TO RADIO
ATCH RADIO CONVERTER FOR OUTSIDE JAPAN
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
AB
DIODE
121-1022
309-GY-18
308-YL-18
306-GN-18
306-GN-18
J703-PK-18
168-RD-14
327-PK-14
200-BK-18
LL
KK
178-GN-10
179-BU-10
177-RD-10
SS
TT (NOTE L)
AE (NOTE K)
RR
ZZ
YY
VV
UU (NOTE L)
AC (NOTE K)
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
JJ
J
AG
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
PP
RR
TT
129-BU
VV
XX
112-PU-18
L21
179-BU-10
L1
1
6
7
8
9
5
4
3
2
11
12
10
200-BK-18
308-YL-18
F774-WH-18
F773-OR-18
109-RD-6
A761-PU-18
172-RD-18
178-GN-10
101-RD-6
308-YL-18
101-RD-6
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
115-RD-18
101-RD-6
877-YL-8
304-WH-8
177-RD-10
179-BU-10
L975-PK-18
308-YL-18
200-BK-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
149-5050
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)
HH
UU (NOTE L)
AC (NOTE K)
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
V
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
Y
A
A
C (NOTE L)
Y (NOTE K)
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 (NOTE L)
AD (NOTE K)
103-RD-18
MM
NN
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
HYD LOCK SOL
RELAY
149-5050
200-BK-18
140-BU
200-BK-18
200-BK-18
4
3
5
T
BK
NOTE F : USE FOR JAPAN.
YL
NOTE E : USE FOR OUTSIDE JAPAN.
5
327-PK-14
877-YL-8
C468-BU-18
179-BU-10
178-GN-10
124-RD-14
308-YL-18
3
200-BK-18
GND
F/B
+B
ACCEL
DECEL
6
ENG GOV
ACTUATOR
151-9326
KEY
200-BK-18
A
2
1
304-WH-8
B
788-YL-18
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
136-9518
200-BK-6
109-RD-6
T
A718-PU-18
200-BK-18
AIH COOLANT
TEMP SENSOR
135-2336
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
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-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
A
168-RD-18
B
HYD OIL
FILTER
INDICATOR
133-6875
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
L14
L10
A A
AIR CLEANER SW
109-9330
430-BU-18
616-BU
322-GY-18
607-PK-18
877-YL-8
327-PK-14
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
117-6353(NOTE F)
154-0490(NOTE E)
L1
304-WH-8
124-RD-14
175-RD-14
110-RD-14
115-RD-14
200-BK
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 (NOTE L)
AD (NOTE K)
495-GN-18
K906-GN-18
168-RD-14
607-PK-18
322-GY-18
616-BU
6
BK
YL
2
1
7
GG
8
9
10
11
AF
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
153-2521
CHASSIS
ATCH
REFUELING
PUMP
123-3928
ATCH
REFUELING
START SW(NO)
6T-9442
R
N
N
FF
HORN
7Y-3919
J
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
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
A588-GN-18
791-RD-18
607-PK-18
615-YL
151-GN-18
150-RD-18
200-BK
CAB/CHASSIS
LAMP RELAY
149-5050
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
149-5050
ATCH
REFUELING
RELAY 1
149-5050
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
149-5050 BOOM LAMP
RELAY
149-5050
10
A770-PK-18
322-GY-18
103-RD-18
124-RD-14
112-PU-18
110-RD-14
320-RD-18
149-PU-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
153-2523
ATCH
BOOM LAMP
153-2521
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
147-PU
607-PK-18
615-YL
12
L
GND
S
P
YL
BK
WH/BU
WH/YL
J703-PK-18
200-BK-18
403-GN-18
327-PK-14
168-RD-14
200-BK-18
403-GN-18
308-YL-18
308-YL-18
309-GY-18
SS
UU
200-BK-18
200-BK
L22
L17
L15
L15
L13
L16
308-YL-18
L10
L14
A
147-PU
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
(NOTE L)
L22
R
WH/GN
309-GY-18
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 (NOTE L)
AE (NOTE K)
403-GN-18
308-YL-18
110-RD-14
PP
NNXX
WW
FAN RELAY
149-5050
YY
150-6938
163-6696
163-6695
163-6694
153-2548
150-6936
150-6937
153-2544
153-2545
153-2537
153-2492
150-6943
150-6942
150-6940
132-1827
150-6944
150-6941
150-6939
153-2549
G-7
H-8 (NOTE K)
H-9 (NOTE K)
H-7 (NOTE K)
G-7
G-7
G-7
H-9
H-9 (NOTE L)
G-9
D-9 (NOTE E)
G-7
G-7
H-8 (NOTE L)
A-2
G-7
G-7
H-7 (NOTE L)
G-7
NOTE G : USE WITH A/C UNIT.
200-BK-18
L21
CC
RELAY PANEL
J703-PK-18
STRAP AS.
DD
NOTE A : NORMALLY OPEN BEFORE REFRIGERANT CHARGE.
EE
G-9
F-9
F-9
E-9
E-9
G-6
G-9
A-9
134-3275
116-0080
134-3274
134-3298
105-9917
7G-1060
134-3344
134-3355
147-PU
X
111-4841
116-0243
140-0923
134-3298
153-2454
150-7014
150-6989
153-2555
167-3498
153-2476
167-3496
116-0096
116-0098
150-7013
167-3451
150-7026
167-3580
150-7022
170-6946
116-0258
J-3
G-1
C-2
C-2
H-4
E-4
B-6
B-5
G-8 (NOTE L)
A-2
B-2
B-2
B-3
G-3
G-6
H-3
G-8 (NOTE K)
J-3
H-6
H-5
E93738
132-1887 HE 08
NOTE K: USE WITH COLD WEATHER FOR JAPAN.
NOTE L: NOT USE WITH COLD WEATHER FOR JAPAN.
UNLESS OTHERWISE SPECIFIED ALL WIRE IS 16 GAUGE.
TO MACHINE STRUCTURE
200-BK-18
200-BK-6
SIS
CONN
(NOTE L) C
(NOTE K) Y
(NOTE L) C
(NOTE K) Y
(NOTE K) Y
(NOTE L) C
ALTERNATOR (P TERM)
CONN 1
CONN 2
CONN 3
CONN 4
CONN 5
CONN 6
CONN 7 CONN 8 CONN 9
CONN 10
CONN 11CONN 12CONN 13CONN 14
CONN 15 CONN 16 CONN 17 CONN 18
CONN 19 CONN 20 CONN 21 CONN 22
CONN 23
CONN 24
CONN 25 CONN 26 CONN 27 CONN 28
CONN 29
CONN 30
CONN 35
CONN 34
CONN 31
CONN 32
CONN 33
+B
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 CIRCUIT
WIPER/WASHER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
ENGINE SHUTDOWN CONTROL CIRCUIT.
AIR INLET HEATER CIRCUIT.
ENGINE/PUMP CONTROL CIRCUIT.