RENR4035
June 2000
M318 and M320 Excavators
Electrical System
M318:
8SS470-UP
M320:
9PS287-UP
©2000 Caterpillar
All Rights Reserved
Printed in U.S.A.
19
A
C
B
12
21
25
22
28
15
8
2
16
6
7
10
18
26
4
29
5
9
27
23
1
20
24
13
3 11
14
30
D
17
19
18
7
2
5
30
20
14
6
15
27
9
1
17
23
24
D
28
10
8
16
4
29
3
11
13
26
22
25
21
12
C
A
B
Machine Harness Connector and Component Locations
Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
AEC - Aux. Hyd. F - 8 D Solenoid- Main Pump PRV G - 14 16
Alternator C - 13 2 Solenoid - OSC Axle Lock F - 14 8
Alternator Fuse C - 15 5 Solenoid - Parking Brake F - 14 11
Battery 12v (2) H - 13 3 Solenoid - Right Front Stabilizer Lockout G - 1 18
Cigar Lighter F - 2 A Solenoid - Right Rear Stabilizer Lockout H - 10 27
Converter 24v - 12v D - 3 A Solenoid - Start C-14 18
Diode - A/C E - 13 D Solenoid - Swing Brake G - 15 16
Diode - AEC - Aux. Hyd. F - 8 D Solenoid - Swing Pump PRV G - 14 16
Diode - Brake D - 6 D Solenoid - Transmission Speed F - 13 11
Diode - Harness AS B - 8 D Solenoid - Travel Activation G - 15 16
Diode - HCR & AEC F - 8 D Secondary Steering Control H - 14
4
Diode - Stop Lamp E - 8 D Switch - AEC B - 10
C
Diode - Temp E - 6 D Switch - AEC Boom Cyl. Pressure E - 15
19
Engine Control C - 12, B - 12 A Switch - AEC Implement Travel F - 15
19
Engine Pump Control B - 11, C - 11 A Switch - AEC Stick Cyl. Pressure E - 15
19
Engine Speed Dial C - 2 C Switch - AEC Swing Pressure E - 15
16
Flasher F - 7 C Switch - Air Filter Clog C - 15
20
Fuse Block (A Black) F - 10 D Switch - Air Horn G - 2
A
Fuse Block (B Yellow) F - 9 D Switch - Aux. Hyd. (ccw rotation) E - 3
B
Fuse Block (C Green) E - 10 D Switch - Aux. Hyd. (cw rotation) D - 3
C
Fuse Block (D Red) E - 9 D Switch - A/C B - 11
C
Governor Actuator C - 13 6 Switch - A/C Pressure E - 14
8
Hour Meter E - 5 D Switch - Backup C - 11
C
Main Fuse G - 8 D Switch - Beacon B - 5 C
Monitor Panel C - 2 C Switch - Brake Light H - 5 21
Motor - Air Conditioner Fan E - 14 8 Switch - Cab Riser B - 7 C
Motor - Heater Fan B - 8 10 Switch - Cab Riser (Up) C - 5 C
Motor - Lower Washer G - 13 11 Switch - Cab Riser (Down) C - 5 C
Motor - Lower Wiper E - 1 12 Switch - Coolant Temp D - 13 2
Motor- Refueling Pump H - 13 9 Switch - Coolant Temp C - 13 5
Motor - Starter C - 14 5 Switch - Creeper Speed C - 6 C
Motor - Secondary Steering H - 12 4 Switch - Disconnect H - 12 3
Motor - Upper Washer G - 13 3 Switch - Engine Oil Pressure D - 13 8
Motor - Upper Wiper E - 2 A Switch - Forward/Reverse Travel Alarm (2) H - 6, G - 6 21
Radio F - 2 A Switch - Front Flood Lamp C - 5 C
Regulator - A/C Temperature B - 10
10
Switch - Hammer B - 8 C
Relay - A/C Clutch D - 13 D Switch - Hazard B - 4 C
Relay - A/C Fan E - 13 D Switch - Head Lamp D - 5 C
Relay - Air Horn E - 7 D Switch - Heater Fan B - 10 C
Relay - Alarm Cab Riser F - 5 C Switch - Heavy Lift C - 10 C
Relay - Brake F - 6 D Switch - Horn/Turn/High Beam G - 3 A
Relay - Brake/Travel Cutoff D - 5 D Switch - Hyd. Oil Filter Clog E - 14 24
Relay - Interval Wiper G - 6 D Switch - Hyd. Oil Low Temperature E - 14 23
Relay - Main Power F - 7 D Switch - Hyd. Oil High Temperature E - 14 23
Relay - Pilot Press Enable F - 7 D Switch - Key (Start) C - 7 C
Relay - Power Mode F - 6 D Switch - Left Front Stabilizer Lockout C - 9 C
Relay - Start C - 15 5 Switch - Left Rear Stabilizer Lockout C - 9 C
Relay - Start/Stop E - 7 D Switch - Low Brake Pressure G - 5 21
Relay - Secondary Steering G - 13 4 Switch - Low Transmission Clutch Pressure F - 13 11
Relay - Secondary Steering H - 13 D Switch - Lower Windshield E - 2 A
Relay - Stop Lamp Cutoff E - 7 D Switch - Lower Wiper C - 7 C
Relay - Swing Brake Timer G - 5 D Switch - OSC Axle Lock C - 5 C
Relay - Temperature E - 6 D Switch - Overload Warning Device A - 5 C
Relay - Transmission Speed F - 6 D Switch - Overload Warning Device C - 8 25
Relay - Travel Alarm F - 5 D Switch - Parking Brake B - 5 C
Relay - Travel Cutoff F - 5 D Switch - Pilot Control Lock B - 5 B
Resistor - Backup Main Pump PRV E - 10 D Switch - Power Mode M318 Only D - 6 C
Resistor - Backup Swing Pump PRV E - 10 D Switch - Power Mode M320 Only D - 6 C
Resistor - Heater Fan B - 8 10 Switch - Primary Steering Flow G - 4 21
Sender - Coolant Temperature D - 12 2 Switch - Rear Flood Lamp C - 5 C
Sender - Fuel Level F - 14 13 Switch - Refueling Pump E - 5 D
Sender - Hydraulic Oil High Temperature E - 14 23 Switch - Reverse Steer Proximity B - 5 26
Sensor - Engine Speed D - 15 14 Switch - Right Front Stabilizer Lockout B - 9 C
Solenoid - Aux. Hyd and Cab Riser H - 14 D Switch - Right Rear Stabilizer Lockout B - 9 C
Solenoid - Aux. Hyd. (cw) G - 15 16 Switch - Start Aid C - 10 C
Solenoid - Aux. Hyd. (ccw) G - 15 16 Switch - Starting Pilot Pressure Enable D - 4 B
Solenoid - A/C Clutch D - 14 15 Switch - Step Door Safety B - 6 A
Solenoid - Blade Front G - 1 27 Switch - Stop Lamp Cutoff/OSC Blocked G - 2 A
Solenoid - Blade Rear H - 10 17 Switch - Swing Brake E - 3 B
Solenoid - Cab Riser (Down) H - 15 D Switch - Swing Brake E - 7 D
Solenoid - Cab Riser (Up) H - 14 D Switch - Transmission Speed C - 6 C
Solenoid - Creeper Speed F - 15 16 Switch - Travel Alarm Cancel C - 5 C
Solenoid - Engine Start/Stop D - 13 6 Switch - Travel Lock B - 6 C
Solenoid - Hammer E - 13 16 Switch - Travel Pedal H - 2 A
Solenoid - Heavy Lift F - 15 16 Switch - Upper Washer B - 8 A
Solenoid - Implement Activation G - 15 16 Switch - Upper Windshield E - 2 A
Solenoid - Left Front Stabilizer Lockout G -1 18 Switch - Upper Wiper B - 7 C
Solenoid - Left Rear Stabilizer Lockout G - 10 27 Travel Lock Magnet H - 2 A
Machine locations are repeated for components located close together.
A = Located Inside Of Cab
B = Located Inside Of RH Console
C = Located Inside Of LH Console
D = Located Around Relay Panel
Part No. Resistance (Ohms)¹
3E-1906 Solenoid: A/C Clutch 17.6 ± 0.6
8C-3663 Solenoid: Engine Start/Stop
Latch Coil : 1.55 ± .15
Unlatch Coil: 10.3 ± 1.03
8U-6424 Solenoid:
Aux. Hyd and Cab Riser
Blade Front
Blade Rear
Hammer
Heavy Lift
Left Front Stabilizer Lockout
Left Rear Stabilizer Lockout
Parking Brake
Right Front Stabilizer Lockout
Right Rear Stabilizer Lockout
Transmission Speed
19
172-7029 Solenoid:
OSC Axle Lock
Creeper Speed
Swing Brake
Travel Activation
Implement Activation
33.8/17 Watt
112-7178 Sender: Fuel Level
Full = 0.4
Empty = 70.6
116-4710 Sender: Hydraulic Oil High Temperature
38.5 @ 100 ºC (212 ºF)
51.2 @ 90 ºC (194 ºF)
134 @ 60 ºC (140 ºF)
122-2373 Resistor: Heater Fan
Position 1 = 6
Position 2 = 1.5
124-0329 Resistor:
Backup Main Pump PRV
Backup Swing Pump PRV
Overall 6.0; Tap 1.5 or 4.5
143-8251 Resistor:
Backup Main Pump PRV
Backup Swing Pump PRV
59 ± 1.18/25 Watt
¹ At room temperature unless otherwise noted.
Resistor, Sender and Solenoid Specifications
Component Description
Related Electrical Service Manuals
Form Number
Alternator: 9W-3043
SENR3685
Starting Motor: 8C-4774
Consist: 8C-4773
SENR3559
Consist: 3E-1944
SENR3581
Consist: 106-8558
SENR3559
Electronic Control Systems SENR6265
Title
Error Message Logged Result Of Fault Possible Causes
Main Pump Circuit No
• Main pump set to minimum
output.
• Main pump PRV solenoid faulty.
• Open in harness wiring for main PRV solenoid.
• Harness wiring for main PRV solenoid shorted to ground.
Low Voltage No • None • Battery voltage below 17 DCV.
RPM Setting Diff No
• Engine operates at high idle
(No effect on AEC or Heavy
Lift operation).
• Engine speed requested does not match the actual governor actuator
position.
RPM Setting High No
• Low idle speed too low.
• Engine stall speed too high or
low.
• Governor actuator position signal too high.
• Open or shorted supply voltage circuit.
• Low idle stop passed.
RPM Setting Low No
• High idle speed too high.
• Engine stall speed too high or
low.
• Governor actuator position signal too low.
• Open or shorted supply voltage circuit.
• High idle stop passed or engine speed adjustment is loose.
Swing Pump No
• Swing pump set to minimum
output.
• Swing pump PRV solenoid faulty.
• Open in harness wiring for swing PRV solenoid.
• Harness wiring for swing PRV solenoid shorted to ground.
Low Engine Speed No
• Hydraulic pump outputs are
reduced.
• Signal from engine speed sensor indicates engine speed is below 750 ±
25 rpm.
• Engine speed sensor is not adjusted properly or is faulty.
• Open in harness wiring form engine speed sensor to controller.
• Harness wiring for engine speed sensor is shorted to ground.
• Engine speed dial signal circuit is shorted to ground.
High Engine Speed Yes
• Engine overload.
• Engine stalls.
• Signal from engine speed sensor indicates engine speed is above 2150
± 200 rpm.
• Incorrect number of flywheel teeth specified in parameter settings.
RPM Dial Setting Yes
• Engine speed set to high idle
(No effect on AEC or Heavy
Lift operation).
• Engine speed dial is faulty.
• Engine speed dial signal circuit has an open.
• Engine speed dial supply voltage circuit has an open or is shorted to
ground.
• Engine speed dial signal circuit is shorted to ground.
Heavy Lift Circuit Yes
• Heavy lift does not operate
correctly.
• Heavy lift solenoid is faulty.
• Open in harness wiring for heavy lift solenoid.
• Harness wiring for heavy lift solenoid is shorted to ground.
Mode SW Open Yes
• Power mode 1 selected no
matter what the position of
the power mode switch.
• Mode switch is faulty.
• Open in harness wiring for mode switch.
• Mode switch supply voltage circuit has an open or is shorted to
ground.
Mode SW Short Yes
• Power mode 1 selected no
matter what the position of
the power mode switch.
• Mode switch is faulty.
• Short to ground in harness wiring for mode switch.
Detected Faults
Connector Location
Connector Number
Schematic
Location
Machine
Location
CONN 1 H - 14 9
CONN 2 G - 13 4
CONN 3 E - 13 8
CONN 4 C - 12 6
CONN 5 G - 12 4
CONN 6 G - 12 4
CONN 7 C -11 6
CONN 8 D - 11 6
CONN 9 E - 11 6
CONN 10 F - 11 6
CONN 11 G - 11 6
CONN 12 H - 10,G - 10 17
CONN 13 C -10 C
CONN 14 D - 10, 9, 8 6
CONN 15 D - 2 A
CONN 16 G - 1 18
CONN 17
D - 1
18
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.
Part No. Function Actuate Deactuate Contact Position
4.0 grams MAX 1.5 grams MIN Normally
(0.14 oz) (0.05 oz) Open
90±21 kPa 70±21 kPa Normally
(13±3 psi) (10.2±3 psi) Open
10132 kPa Normally
(1470 psi) Open
Low 275 kPa (39.9 psi) MAX Low 170±55 kPa (24.6±7.9 psi) Normally
High 2800±140 kPa (406±20.3 psi) High 1750±200 kPa (254±29 psi) Open
94 ºC Normally
201 ºF Open
100 ºC Normally
212 ºF Open
11 ºC 17 ºC Normally
52 ºF 63 ºF Open
2600 kPa Normally
(377 psi) Open
507 kPa Normally
Open
3E-6429
5W-9972
116-4710
119-3399
119-3400
171-7570
--
114-5333 A/C Pressure
Coolant Temperature
Hydraulic Oil Low Temperature
Off Machine Switch Specification
Low Brake Pressure
3E-6455 Engine Oil Pressure
Low Transmission Clutch Pressure
163-2084
Primary Flow
--
--
AEC Swing Pressure
Boom-Cyl Pressure
Stick-Cyl Pressure
(74 psi)
--
--
Hydraulic Oil High Temperature
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.
Harness And Wire Electrical Schematic Symbols
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.
A
1 PARKING LIGHTS RHS 7,5
2 PARKING LIGHTS LHS 7,5
3 INSTRUMENT LIGHTING 7,5
4 LOW BEAM RHS 7,5
5 LOW BEAM LHS 7,5
6 HIGH BEAM RHS 7,5
7 HIGH BEAM LHS 7,5
8 CONTROL LIGHTS; TURN SIGNAL 7,5
FUSE "A" BLACK
1 BACKUP 7,5
2 POWER MODE SELECTION; AEC; SWING BRAKE 7,5
3 INDIVIDUAL STABILIZERS 7,5
4 WORKING LIGHTS 15
5 HAMMER BLOW FREQUENCY ADJUST.; FLOW CONTROL 7,5
6
ELECTRONICS
7,5
7 ROTATING BEACON 15
8 AIR SUSPENDED DRIVER SEAT; PRIORITY 7,5
FUSE "C" GREEN
1
2
3
4
5
6
7
8
FUSE "B" YELLOW
1 STOP LIGHT 7,5
2 AIR CONDITION 20
3 HORN; BUZZER (OVERLOAD); 1/3 PRESSURE DROP 7,5
4 BLUE LIGHT (REVERSE STEERING); TRAVEL ALARM 7,5
5 ARM REST SWITCH; SWING GEAR; MISCELLANEOUS- 15
6 SECONDARY STEERING 7,5
7 WINDSHIELD WIPER UPPER AND PUMP 7,5
8 WINDSHIELD WIPER LOWER AND PUMP 7,5
FUSE "D" RED
FUNCTION; RELAY TRAVEL CUT OFF; PARK BRAKE;
TRANSMISSION SPEED; CREEPER SPEED; CAB-RISER
OSC AXLE LOCK;
15 1234567891011121314
15 1234567891011121314
H
G
F
E
D
C
B
A
H
G
F
E
D
C
B
A
AWG MM*2
0 50
4 16
6 10
8 6
10 4
12 2.5
14 1.5
16 1
00 70
BK(9)
BK
BK
RD(12)
RD(26)
BK
BK
GY(5)
BK(9)
BK
RD(12)
GY(5)
GY(6)
WH(4)
RD(12)
GY(6)
GY(5)
WH(4)
BK(9)
BK
BK
RD(26)
GY(6)
WH(4)
GY(9)
GY(9)
BU-10(1)
BK/GN(8)
BK/GN(8)
BU-10(1)
BK
REFUELING
PUMP
5W-8633
RD-00 BK-00
BK-00
RD-6(4)
DISCONNECT
SWITCH
7N-0718
12V BATTERY
(QNTY 2)
3T-5760
BK
RD(25)
YL
RD-4
YL
SECONDARY STER
MOTOR
118-9168
RD-00
RD-4
BK-10
TO BOX BK-6
TO FRAME
L15
L26
L
L
L A
A
C
A
W
W
X
X
P
FF
R
R
T
W
FF
N
SECONDARY STER
AUX HYD
(CW ROTATION)
BK
BK
RD(8)
RD(32)
WH(15)
GN(14)
GN(15)
BK
BK
W
CAB RISER
(DOWN)
SOLENOID
8U-9137
CAB RISER
(UP)
SOLENOID
8U-9137
AUX HYD &
CAB RISER
SOLENOID
8U-6424
C
BK
BK
BK
C
C
TRAVEL
ALARM
3T-1815
MOTOR
T
POS NEG POS NEG
MOTOR
TURN LAMP GP
116-9624
TURN LAMP
5W-2040
BASIC LAMP GP
116-9625
STOP LAMP
9X-4493
TAIL LAMP
5W-2040
01
02
03
04
05
06
1
2
BK
BK
RELAY
3E-0075
7
8
9
10
11
DUMP VALVE
R TERM (W)
SHUT D SOL
MAGN SWITCH
EMS
6
5
4
3
2
1
STEER SW
STEER SW
GOV.SWITCH
KEY SWITCH
GROUND
BATTERY + RD
BK
YL
OR
BU
PU
BR
WH
PK
GN
GR
WH(6)
WH(5)
BK/YL/WH(2)
BK/WH(3)
PU(3)RD(8)
PU(3)
RD(8)
WH(15)
WH(15)
BK
BK
BK-4
TO FRAME
WASHER
UPPER
7T-8890
WASHER
LOWER
7T-8890
OR(4)
BK
PU(6)
BK
SWING PUMP PRV
SOLENOID
143-2363
MAIN PUMP PRV
SOLENOID
143-2363
TO FRAME
BK
BK
BK
BK
GN/BR(7)
BK/GN(15)
BK/GN/RD(3)
BK/YL/WH(1)
GN/BR(7)
BK/GN(15)
BK/GN/RD(3)
BK/YL/WH(1)
IMPLEMENT
ACTIVATION
SOLENOID
172-7029
TRAVEL
ACTIVATION
SOLENOID
172-7029
SWING
BRAKE
SOLENOID
172-7029
CREEPER
SPEED
SOLENOID
172-7029
PU(2)
GN/BU(1)
BR/WH(3)
BK/GN(5)
BK/WH(1)
GN/BU(1)
PU(2)
BK
BK
L21
L18
L82
L20
L21
C
W
C
C
C
C
G
G
G
C
C
W
D
SOLENOID
8U-9137
AUX HYD
(CCW ROTATION)
SOLENOID
8U-9137
RD-00
BK
BK
SECONDARY STER
RELAY
117-4861
W
BK
BK
GN(24)
PK(7)
PK(12)
BK
OSC AXLE
LOCK
SOLENOID
172-7029
PU(19)
C
J
J
BK
BK
WH
WH
L94
BK
BK
TO FRAME
RD(35)
GN(17)
BU(16)
L94
MOTOR
MOTOR
1
2
3
12
UNUSED
SECONDARY
STEERING CONTROL
132-6640
85
86
30
87
87a
1
2
1
2
RD(26)
TO FRAME
YL-14(4)
BR/WH(3)
PARKING
BRAKE
SOLENOID
8U-6424
TRANSMISSION
SPEED
SOLENOID
8U-6424
BK BK
BK
BK
BK-14
LOW TRANSMISSION
CLUTCH PRESS SW
171-7570
HEAVY LIFT
SOLENOID
8U-6424
RD(24)
BK
HAMMER
SOLENOID
8U-6424
BK
WH(1)
BK
BK
BK
BK
HYD OIL
FILTER
CLOG SW
116-8514
BU(7)
RD(9)
BR/BK(1)
BR/BK(1)
OR(8)
YL(16) YL(13)
YL(15)
YL(16)
YL(15)
YL(13)
RD-12
BK
BK-12
BR-12
L10
L4
L17
C
C
D
D
D
D
V
V
V
C
C
C
OR(3)
DIODE
8U-8045
OR(4)
PU(6)
YL(17)
WH(12)
L82
RD-00
BK
TO FRAME BK
RD(31)
GN(4)GN(4)
DV
V
FAN
CLUTCH
L89
L89
WH(15)
AEC BOOM-CYL
AEC STICK-CYL
AEC SWING
BK-12
DIODE
140-6617
GN(25)
PK(11)
PK(9)
PK(8)
GN(26)
GN(27)
GN(24)
PK(7)
PK(12)
PK(10)
C
C
C
PK(12)
T
HYD OIL
LOW-TEMP
SWITCH
119-3400
T
T
HYD OIL
HIGH TEMP
SW & SENDER
116-4710
A/C
RELAY
123-6527
86
85
30
87
87b
AEC IMPLEMENT
TRAVEL SWITCH
117-0651
1
3
2
FUEL LEVEL
SENDER
112-7178
A/C
RELAY
123-6527
86
85
30
87
87b
1
2
MOTOR
2
1
BR-12
BK-12
AIR
CONDITIONER
FAN
145-7724
1
2
GN
BU
A/C PRESS
SWITCH
114-5333
SW PRESS
163-2084
1
4
2
SW PRESS
163-2084
1
4
2
SW PRESS
163-2084
1
4
2
RD(24)
BK
BK
BK
BK
GY(9)
GY(10)
GY(6)
WH(4)
RD(26)
GY(6)
WH(4)
LAMP
LICENCE PLATE
116-9623
BK
BK
RD(26)
WH(4)
GY(6)
BK
RD(26)
WH(18)
GN(23)
BR(8)
RD(23)
BK
WH(10)
BR(2)
BK(13)
RD(22)
RD-00
BR(6)
WH(16)
YL(17)
WH(12)
BR(6)
WH(16)
WH(16)
BR(6)
GN(1)
BR/WH(2)
GN(2)BR/WH(2)
AIR FILTER
CLOG SW
5W-9934
TO FRAME
TO ENGINE
BK-00
BK-4
BK-00
BR/BK(5)
BK
BR/BK(2)
BU(5)
GN(5)
BR/WH(1)
BK
GN(4)
BU/YL(4)
BR/WH(1)
BU(5)
GN(5)
BR/BK(2)
GN
(2)
BK
RD-4(4)
RD-4(4)
RD-6(2)
RD-4(1)
RD-6(3)
RD-4(1)
COOLANT TEMP
SWITCH
119-3399
COOLANT TEMP
SENDER
8U-1516
ALTERNATOR
9W-3043
RD-6(2)
BR/BK(5)
BK
BK
START
BK-8
GN-8
BK
BK
BK-8
GN-8
GN(4)
BK
L1
L4
L4
L1
L7
L9
L10
L10
L11
L11
BK
L15
L14
L14
L16
L13
L13
L76
L76
G
L
L
GG
D
D
L
D
D
D
D
U
U
D
D
D
N
D
DD
D
G
G
G
G
CC
OR(6)
OR(5)
OR(6)
TO CAB
BK-10
BK
BK-10
EE
L7
K
K
G
WH(15)
W
BK
GN
BK
GN
BK
GN
D
GG
WH(13)
PU(10)
YL(6)
BR(9)
WH(19)
RD(24)
ENGINE
START/STOP
SOLENOID
8C-3663
T
+
D+
D-
W
STOP LAMP
9X-4493
123-6472
2
24V
3
GND
7
TXD
6
RXD
A
B
C
D
WH
BR
GN
YL
E
SCHIELD
BB3
BK
BK
ENGINE SPEED
SENSOR
6V-2455
1
2
1
2
BK
BK
RELAY
3E-0075
T
FUSE
ALTERNATOR
123-8838
70A
T
2
1
COOLANT TEMP
SWITCH
127-5347
BK
BK
1
2
BK-18
RD-18
3BU-18
ENGINE
OIL SW
3E-6455
1
2
GN-14
GN-14
A/C CLUTCH
SOLENOID
3E-1906
CONTROL-ENGINE 143-9581
16
SOLENOID (DRE2K)
17
SOLENOID (DRE2K)
01
POS INDICATOR OUT
13
POS INDICATOR IN
19
POS INDICATOR GND
20
NC
03
NC
07
NC
10
NC
11
NC
04
NOMINAL VALUE 1
12
PWM INPUT
22
SIGNAL GROUND
14
NC
23
NC
21
SIGNAL GROUND
06
NOMINAL VALUE GND 2
05
NOMINAL VALUE 2
24
ACTUAL VALUE OUTPUT
09
+ ELECTRONIC
15
OUTPUT STAGE
18
SWITCHING INPUT
02
GND (L0)
08
GND (L0)
MOTOR
MTR BAT
G S
STARTER
8C-4774
1
2
BK
BK
START AID
SOLENOID
122-2377
GOV ACTR 152-0197
01
SOLENOID (DRE2K)
02
SOLENOID (DRE2K)
01
POS IND OUT
02
POS IND IN
03
POS IND GND
RD
BR
BK
01
02
03
04
SHIELD
1
2
ARC
SUPPRESSOR
106-8704
WH(4)
BK
GY(6)
BK
BK
L5
TO FRAME
L
L4
L1
TURN LAMP GP
116-9624
TURN LAMP
5W-2040
BASIC LAMP GP
116-9625
TAIL LAMP
5W-2040
START AID SW
8U-6357
AEC SW
5W-9372
A/C SW
5W-9372
RD/YL
BK
RD/YL
BK (3)
GY
RD/YL(29)
RD/YL(28)
BK
GY
GY
BK
BK(5)
BK(4)
BK(3)
RD/YL (5)
BK(2)
RD/YL (7)
GY
GN(1)
RD/YL(3)
BK
RD/YL(26)TO FRAME
GY
BK BK
PU(8)
PU(8)
BK
RD(21)
GY
GYBK
BK
YL(7)
YL(13)
YL(8)
YL(7)YL(13)
BU(11)
RD(20)
BK(10)
BK
BK
BK
BU(10)
GN(9)
BK
RD(21)
PU(8)
BR(7)
OR(11)
BU(11)
RD(20)
BK(10)
BK
YL(13)
BK
BU(9)
RD(21)
BR(7)
BR(2)
WH(10)
RD(11)
BR(7)
BU(8)
YL (12)
GN(9)
GN(6)
BU(9)
YL(5)
WH(17)
GN(21)
RD(21)
RD(10)
RD(22)
WH(18)
GN(23)
BR(8)
BU(13)
BK
BK
PU(9)
RD (23)
BK(13)
RD(22)
BK
TO FRAME
RD(24)
WH(16)
BR(6)
WH(12)
YL(17)
YL(15)
YL(16)
YL(13)
L1
L3
L3
L1
L4
L5
L7
L8
L9
L66
L66
L67
L67
L56
L65
L57
L55
GN(21)
WH(17)
G
B
V
V
B
E
B
E
B
B
B
B
B
B
B
HEAVY
LIFT SW
5W-9372
LEFT REAR
STABILIZER
LOCKOUT SW
5W-9372
RIGHT REAR
STABILIZER
LOCKOUT SW
5W-9372
LEFT FRONT
STABILIZER
LOCKOUT SW
5W-9372
RIGHT FRONT
STABILIZER
LOCKOUT SW
5W-9372
GY
YL(5)
YL(12)
BACKUP SW
133-8327
PU(6)
OR(4)
GN(7)
WH(12)
BU(15)
YL(17)
BK
GY
GY
BK
E
B
E
EG
BK-10
K
L80
OR(11)
OR(11)
BU(9)
GY(1)
3
7
2
10 9
4
1
8
A3
B3
B4
B5
B1
C1
HEATER FAN SW
111-3805
05
08
09
04
03
04
03
02
01
5 7
1
9
10
T
1
2
A/C TEMP
REGULATOR
3E-5464
CONTROL-ENG/PUMP
M318 = 147-8479
M320 = 147-8481
40
TXD
42
RXD
12
GND (BB3)
--
NC
19
MODE TEMP.
22
GOVERNOR CONTR-KL.3
32
MAGNET TRAVEL SPEED +
33
MODE III LAMP +
35
SW-TRAVEL SPEED CONTR
37
BRAKE LIGHT
38
MODE II
39
MODE I
44
GOVERNOR CONTR-KL.1
45
GOVERNOR CONTR-KL.2
51
SWITCH HLC
02
+ 24 VOLT
01
+ 24 VOLT
--
NC
--
NC
--
NC
10
NOMINAL VALUE GND 2
34
NOMINAL VALUE 2
46
ACTUAL VALUE OUTPUT
--
NC
36
SW-TRAVEL PEDAL
03
GROUND
04
GROUND
50
SW-PRESS AEC
30
SOLENOID HLC +
--
NC
53
ENGINE SPEED SENSOR
18
ENGINE SPEED SENSOR
--
NC
29
SOL SWING CONTROL +
--
NC
28
SOLENOID VALVE-LS +
--
NC
49
MODE III
--
NC
5
7
2
9
10
6
1
8
5 7
1
9
10
5 7
1
9
10
5 7
1
9
10
5 7
1
9
10
5 7
1
9
10
5 7
1
9
10
BU(9)
YL(12)
BR(7)
GN(21)
WH(17)
YL(5)
WH(6)
BK/GN(7)
BK/WH(3)
PK(13)
BR(11)
BK/YL/WH(2)
GY(1)
BR/BK(2)
BR/WH(3)
RD/YL(3)
GN(1)
RD/YL(5)
BK(2)
RD/YL(7)
BK(3)
BK(4)
BK(5)
YL (1)
WH(1)
RD(2)
RD(3)
BU/YL(2)
PU(2)
BK/WH(1)
BK/GN/RD(2)
BK/GN(2)
GN/BR(2)
GY(2)
BK(1)
RD/YL(1)
BK(6)
RD/YL(6)
BK/GN/RD(3)
BR/WH(2)
GN/WH(1)
RD(5)
RD(1)
GN/BR(1)
PU(2)
BU(1)
BR/WH(3)
BK/GN/RD(3)
GN/BR(7)
BK/GN (15)
BK/WH(1)
GN/BR(4)
GN/BR(3)
BU/YL(3)
GN(4)
GN/BR(3)
GN/BR(4)
GN(4)
BU/YL(3)
WH(4)
RD/YL(11)
GN/BU(4)
GN/WH(4)
GY(4)
RD(8)
RD/YL(12)
RD(7)
BU/YL(4)
RD(9)
BU (7)
GN(5)
BU (5)
WH(1)
BK(4)
BK(5)
BK(2)
BK(3)
YL (1)
BK(1)
BR/WH(2)
BR/BK(1)
BR/WH(1)
BR/BK(2)
GN(2)
GN(1)
RD(10)
BU(8)
WH(7)
RD(11)
GN(6)
BU(10)
BR(11)
PK(13)
BK/GN(7)
BK/WH(3)
BK/YL/WH(2)
WH(6)
WH(1)
BK(1)
BK(2)
BK(3)
BK(4)
YL (1)
BK(5)
BR/WH(1)
BR/BK (1)
BR/WH(2)
BR/BK (2)
GN(1)
GN(2)
BU(1)
BR/WH(3)
BK/GN/RD(3)
BK/WH(1)
BK(8)
WH(3)
OR(1)
RD/YL(9)
RD/YL(8)
RD(4)
BK/GN(10)
BK/PU(1)
RD/YL(5)
RD/YL(6)
RD/YL(7)
RD/YL(1)
RD(5)
BK(7)
RD(3)
RD/YL(3)
YL(2)
GY(1)
GN/WH(1)
GY(2)
RD-10(6)
RD-10(1)
RD-10(8)
RD-10(7)
GY(4)
GY(6)
BU-10(2)
RD(5)
RD/YL(1)
RD(10)
RD/YL(14)
RD/YL(7)
RD/YL(6)
RD/YL(5)
OR(12)
BK/PU(1)
BK/PU(2)
BK/GN(10)
RD(4)
RD(8)
RD/YL(8)
RD/YL(15)
RD/YL(12)
RD/YL(13 )
RD/YL(9)
RD/YL(11)
RD-12
RD/YL(10)
GY(2)
GY(3)
GY(4)
GY(5)
GY(6)
RD(5)
RD/YL(14)
RD(10)
RD/YL(1)
RD/YL(5)
RD/YL(6)
OR(12)
RD/YL(7)
BK/PU(1)
BK/PU(2)
BK/GN(10)
RD(4)
RD(8)
RD/YL(8)
RD/YL(9)
RD/YL(10)
RD/YL(11)
RD/YL(12)
RD/YL(13)
RD-12
RD/YL(15)
WH(3)
BK(8)
BU(10)
YL(5)
RD(11)
GN(6)
BU(8)
RD(10)
PU(9)
GN(21)
WH(17)
GN(9)
YL(12)
BK(1)
RD/YL(11)
GN/BR(3)
GN/BR(4)
GN/BU(4)
GN/WH(4)
GY(4)
WH(4)
RD/YL (12)
BU/YL(3)
YL(1)
GN(4)
BK(2)
BK(3)
BK(4)
BK(5)
RD(8)
WH(1)
BU(7)
RD(9)
BR/BK(1)
GN(4)
BU/YL(4)
BR/WH(1)
BU(5)
GN(5)
BR/BK(2)
GN(1)
BR/WH(2)
GN(2)
WH(20)
PU(2)
GN/BU(1)
BR/WH(3)
BK/GN(5)
BK/WH(1)
YL-14(4)
RD(7)
L8
L1
L24
L46
L45
L13
L16
L17
L43
L44
L40
L46
L18
L19
L20
L41
L40
L42
L42
L65
L45
L86
L41
L40
L47
L53
L54
L56
L57
L58
L59
L60
L61
L38
L39
L73
L74
L73
PU(3)
PU(3)
PU(3)
WH(6)
WH(5)
BK/YL/WH(2)
BK/WH(3)
BK/GN(7)
PK(13)
BR(11)
BR(11)
PK(13)
WH(6)
BK/YL/WH(2)
BK/GN(7)
BK/WH(3)
G
G
D
F
E
A
A
F
A
B
OR(3)
OR(3)
OR(3)
BR/BK(2)
BR/WH(3)
PU(3)
GN(7)
WH(12)
BU(15)
BU(15)
GN(7)
GN(7)
BU(15)
PU(6)
WH(12)
OR(4)
YL(17)
BU(15)
GN(7)
L83
L83
L84
L84
L83
L85
L85
RD(28)
RD(28)
RD(29)
BU(15)
GN(7)
BACKUP RESISTOR
MAIN PUMP PRV
M318/M320
BACKUP RESISTOR
SWING PUMP PRV
M318/M320
RD-10(5)
RD-8(2)
RD-10(4)
RD-10(3)
RD-10(8)
RD-10(7)
KL.15
F
F F
F
L86
PU(9)
BK/GN(15)
GN/BR(7)
PU(9)
L87
L86
PU(2)
RD(31)
RD(31)
WH(15)
BU/YL(5)
YL(10)
L80
OR(11)
PU(8)
PU(9)
WH(7)
PU(8)
GN(24)
PK(12)
PK(7)
GN(24)
BU(21)
GY(15)
YL(18)
PU(8) PU(8)
L81
L81
M318: 124-0329 (47 )
M320: 143-8251 (59 )
PK(1)
BU(3)
RD(34)
BK/GN(3)
GN/BR(2)
BK/GN(3)
RD(34)
BU(3)
GN/BR(2)
BK/GN(3)
RD(34)
BU(3)
L60
L92
L92
L91
GN(17)
RD(35)
BU(16)
BU(3)
RD(34)
BK/GN(3)
GN/BR(2)
BU(18)
L93
L91
L93
04
05
21
38
27
01
40
03
06
07
08
23
30
32
33
34
02
13
24
25
26
14
22
36
37
35
31
39
29
28
20
19
10
09
18
17
16
15
12
11
09
10
01
02
03
04
05
06
07
08
12
11
07
12
10
11
06
01
02
7,5A 25A
7,5A
7,5A
15A
7,5A
7,5A
6
5
4
3
2
1
7,5A
15A
8
7
FUSE BLOCK 148-0080
C GREEN
F
E
D
C
B
A
H
G
7,5A
7,5A
15A
7,5A
7,5A
20A
7,5A
6
5
4
3
2
1
7,5A
7,5A
8
7
FUSE BLOCK 1480081
D RED
F
E
D
C
B
A
H
G
02
06
01
05
03
04
28
19
20
01
26
04
08
18
32
38
13
35
37
22
17
07
03
11
05
06
07
08
10
09
14
12
16
18
15
17
56
13
01
20
49
70
48
57
65
66
67
68
47
53
54
30
60
43
44
52
02
40
41
42
33
58
36
31
38
55
34
50
21
01
03
04
02
YL(4)
BK/YL/WH(1)
BK/WH(2)
GN/WH(2)
GN/BU(2)
BK/PU(2)
GN/WH(3)
GN/BU(3)
GY(3)
RD/YL(10)
BK/GN(4)
BK/GN(5)
RD(6)
BR(1)
BK(8)
WH(3)
BR(10)
GN/BU(1)
RD-14(1)
GN/WH(2)
GN/BU(2)
RD-10(4)
RD-10(3)
RD/YL(2)
GN/WH(3)
GN/WH(1)
GN/WH(4)
GN/BU(3)
GN/BU(4)
GY(1)
GY(3)
GY(5)
YL(2)
RD/YL(16)
RD/YL(3)
RD(16)
RD(18)
OR(1)
RD(3)
BK(7)
RD(19)
YL(2)
RD/YL(3)
RD/YL(16)
RD(16)
OR(1)
RD(3)
BK (7)
BU-10(2)
RD(18)
RD(19)
RD/YL(2)
GN/WH(1)
GN/WH(3)
GN/WH(4)
GN/BU(3)
GN/BU(4)
GY(1)
RD-6(4)
BR
BU
BR
BU
BR
DK-BU
GN/YL
BK
RIGHT REAR
STABILIZER
LOCKOUT SOL.
8U-6424
LEFT REAR
STABILIZER
LOCKOUT SOL.
8U-6424
GN/YL
BR
GN/YL
DK-BU
BK
GN/YL
BR
BU(13)
GN/BR(3)
PK(13)
BK/YL/WH(2)
WH(3)
BR(11)
GN/WH(2)
BU/YL (3)
BR(10)
BK/GN(4)
GN/BU(2)
BR(1)
GN/BR(4)
BK(8)
GN/BU(3)
GN/WH(3)
GY(3)
BK/GN(7)
BK/WH(3)
BK/PU(2)
BK/WH(2)
RD/YL(10)
RD(6)
BU(1)
RD(25)
BU-10(1)
BK/GN(8)
BK(2)
BK(3)
BK(4)
BK(5)
GY(5)
GY(6)
RD(12)
RD-6(4)
BK(9)
WH(4)
RD(12)
GY(6)
GY(5)
WH(4)
BK(9)
BK/GN(8)
BU-10(1)
RD-6(4)
PU(19)
WH(7)
GN/BR(4)
BR(10)
WH(3)
BK/GN(4)
GN/WH(2)
BU/YL (3)
GN/BU(2)
BR(1)
BK(8)
GN/BU(3)
GN/WH(3)
GY(3)
BK/PU(2)
BK/WH(2)
RD/YL(10)
RD(6)
BU(1)
GN/BR(3)
BK(5)
BK(4)
BK(3)
BK(2)
WH(7)
BR(11)
PK(13)
BK/GN(7)
BK/WH(3)
BK/YL/WH(2)
BU(13)
RD(25)
GN/BR(4)
BR(10)
WH(3)
BK/GN(4)
GN/WH(2)
BU/YL(3)
GN/BU(2)
BR(1)
BK(8)
GN/BU(3)
GN/WH(3)
GY(3)
BK/PU(2)
BK/WH(2)
RD/YL(10)
RD(6)
BU(1)
GN/BR(3)
BK/GN(7)
PK(13)
BR(11)
DK-BU
BK
BK(4)
BK(3)
BK(2)
BK(1)
GN/BR(7)
BK/GN(15)
BK/GN/RD(3)
BK/YL/WH(1)
BK-6
BK-6
L21
L22
L19
L18
L37
L38
L39
L36
L33
L33
L24
L23
L22
L19
L23
L28
L29
L30
L31
L32
L26
L27
L31
L34
L36
L37
L71
L72
L72
TO UNDCRGBR
BU
BLADE REAR
SOLENOID
8U-6424
WH(5)
C A
BB
AA
Y
Y
Z
A
A
A1
A2
A3
A4
A5
A6
A7
A7
A6
A5
A4
A3
A2
A1
Y
RD-8(3)
RD-10(2)
KL.30
BK(9)
WH(4)
L33
A
FF
L89
RD(31)
RD-12
RD-12
RD(31)
L89
PU(19)
PU(19)
BU(20)
BU(20)
PK(7)
BU(20)
GN(24)
PK(12)
BU(20)
GN(17)
RD(35)
BU(16)
GN(17)
RD(35)
BU(16)
L93
C A
L94
04
03
02
01
4
3
2
1
TERMINAL
5W-3624
04
03
02
01
7,5A
7,5A
7,5A
7,5A
7,5A
6
5
4
3
2
1
7,5A
7,5A
8
7
FUSE BLOCK 148-0078
A BLACK
F
E
D
C
B
A
H
G
15A
7,5A
7,5A
15A
7,5A
6
5
4
3
2
1
7,5A
15A
8
7
FUSE BLOCK 148-0079
B YELLOW
F
E
D
C
B
A
H
G
30
10
21
27
12
11
33
36
25
24
23
05
39
40
16
29
06
34
14
15
02
09
31
A
B
C
BRAKE
117-4861
TRANS SPEED
117-4861
RD-12
GY(5)
GY(6)
RD/YL(13)
BU-10(2)
RD(10)
RD/YL(16)
RD/YL(14)
RD/YL(15)
RD(16)
RD(18)
RD(19)
GY(2)
RD/YL(3)
RD(4)
BK/GN(10)
BK/PU(1)
RD/YL(1)
OR(12)
RD/YL(5)
RD/YL(6)
RD/YL(7)
BK/GN/RD(4)
WH
OR(10)
RD/YL(13)
GN(6)
BK/WH(2)
BK(6)
TO BOX
RD/YL
RD
BU-10
BK/WH(2)
BK/YL/WH(1)
YL(4)
BK
BK
GN(6)
RD(15)
BK
BK
BK
RD(14)
BU(10)
BU (8)
WH(7)
OR(13)
OR(12)
RD(2)
GN/BR(1)
BK/GN(1)
BK/GN/RD (2)
BK/GN/RD (1)
BK/GN(2)
BK
BK
BK
BK
BK
BK/GN(1)
BK/GN(4)
GN/BR(1)
BK/GN/RD(2)
BK/GN/RD(1)
BK/GN/RD(4)
WH(9)
RD/YL(15)
RD-8(1)RD-8(2)
RD-8(1)RD-8(3)
RD/YL(10)BK/WH(7)
BK/WH(2)
BK
BK
RD/YL(10)
RD(6)
BU(1)
FORWARD/REVERSE
TRAVEL ALARM
SW (QNTY 2)
9D-7032
BRAKE
LIGHT SW
8U-2158
LOW BRAKE
PRESS SW
5W-9972
RD(25)
BK(2)
BK(3)
BK(4)
BK(5)
BK
BK(1)
BK(2)
BK(3)
BK(4)
GN/YL
RD(12)
BK/GN(8)
BU-10(1)
BK-6
L31
L30
L29
L27
L28
L51
L50
L87
L32
L51
L32
L34
L30
L36
L48
L29
L30
L36
L51
SWIVEL
121-2974
D
C
C
A
A
F
A
F
A
A
A
A
A
A
A
PILOT PRESS
GN/BR(7)
BK/GN(15)
PU(9)BK
PK(14)
BK
AEC
AUX-HYD
117-4861
FF
RD(31)
BU/YL(2)PU(8)
PK(7)
BU(20)
GN(29)
PK(12)
WH(5)
PK(12)
BU(9)
GN(28)
BK
BK
GY(7)
GY(15)
BU(21)
WH(20)
YL(18)
L12
L12
BU(18)
BU(3)
GN/BR(2)
BK/GN(3)
A
A
F
OUT (LAMP)
+ BATTERY
GROUND
49a
C2
49
C
31
FLASHER
8U-9152
85
86
30
87
87a
85
86
30
87
87a
85
86
30
87
85
86
30
87
01
02
03
04
05
06
MAIN FUSE
124-0016
60A
85
86
30
87
87a
MAIN-POWER
157-0836
30
87
86
85
31
31b
15
53e
53c
INTERVAL
WIPER RELAY
155-4574
I
2
1
1
2
DIODE
106-8704
BU/YL(2)
PU(2)
BK/WH(1)
BK/GN(3)
BK/GN(2)
PK(13)
BR(11)
BK/GN/RD(2)
YL(5)
RD/YL(30)
BK
RD(3)
BK(7)
WH(2)
BK/GN(1)
BK(8)
OR(3)
WH(3)
BU(1)
BR/BK(1)
RD(4)
BR/WH(1)
GN(3)
BU(2)
RD/YL(2)
RD/YL(9)
BU(4)
BK/PU(1)
BK/GN(10)
YL(2)
OR(1)
GN(29)
GN(2)
RD/YL(8)
BK/GN/RD(1)
START/STOP
117-4861
TEMP.
117-4861
BU/YL(2)
RD/YL (2)
GY(2)
RD(2)
GN/BR(1)
BK/GN(1)
BK/GN/RD(2)
BK/GN/RD(1)
GN(29)
BK/GN(2)
RD(1)
BU(4)
GN(3)
BU/YL(5)
BK(6)
WH(2)
BU(2)
RD/YL(8)
RD(5)
BK (7)
RD(3)
RD/YL(9)
YL(2)
GY(1)
GN/WH(1)
RD/YL(2)
OR(1)
RD/YL(11)
RD(8)
GY(4)
GN/WH(4)
GN/BU(4)
RD/YL(12)
BK/PU(2)
GN/WH(3)
GN/BU(3)
GY(3)
RD/YL(10)
WH(2)
PU(4)
RD/YL (14)
BK RD(11)
GN(3)
GN(5)
BU(7)
BU(4)
PU(4)
RD(9)
RD(1)
RD(13)
WH(8)
RD(14)
WH(8)
BK
BK
RD(13)
RD(17)
RD(16)
RD(7)
BK
RD(19)
BU/YL(4)
RD(18)
RD(16)
RD/YL (15)
RD/YL (14)
RD(1)
BU(4)
YL(10)
BU/YL(5)
BK(6)
WH(2)
PK(1)
RD(7)
BU/YL (4)
RD(9)
BU (7)
GN(5)
WH(7)
BU(8)
BU(10)
GN(6)
RD(10)
BK/GN(2)
BK/GN(4)
BK/GN(5)
RD(6)
BR(1)
BK/GN(5)
RD(6)
BR(1)
RD(12)
L48
L49
L62
L63
L64
L64
L63
L62
L61
L54
L60
L59
L52
L50
L49
L48
L46
L44
L50
L43
L38
L39
L43
L47
L46
L50
L49
L44
L52
L52
L46
L59
L60
L54
GY
L77
BK
BK
GN(13)
GN(13)
L78
L48
BK/RD(2)
F
A
F
A
A
A
A
A
L46
L44
L50
L48
B
B
GN(10)
POWER
MODE
117-4861
ENABLE
117-4861
BU(9)
L80
BRAKE
GY
L47
OR(12)
GN(3)
YL(10)
BU/YL(5)
ONLY M320
POWER
MODE SW
139-8289
BK
OR(11)
EB
YL(10)
WH(9)
OR(10)
GY(7)
GN(10)
ONLY M318
POWER
MODE SW
5W-9372
BK
GY
BK
BU/YL(2) YL(5)
BU(9)
BR(10)
BR(10)
GN/BU(1)
BU(20)
PK(7)
SWING
BRAKE
117-4861
BK
BK
BU(9)
GN(29)
GN/BU(1)
L12
GY(7)
BU(21)
YL(18)
GY(15)
WH(20)
L12
RD(34)
BU(3)
GN/BR(2)
GN/BR(2)
BK/GN(3)
L25
PK(1)
PK(1)
L90
L90
L90
BU(2)
BK/YL/WH(1)
HCR&AEC
GN(17)
BU(18)
BU(16)
RD(35)
RD(34)
L87
OR(5)
A
A
87a
85
86
30
87
87a
87a
15
30
KEY SWITCH
117-9507
85
86
30
87
87a
5
3
2
1
DIODE
TEMP
123-3998
1
2
3
4
DIODE
STOP LAMP
123-5635
5
5
3
2
1
DIODE
120-5969
3
1
9
10
5
7
2
6
8
AIR HORN
5W-5883
85
86
30
87
5 7
1
9
10
STOP LAMP
CUTOFF 60s
174-8208
31
15
30
87
87a
85
86
30
87
87a
CAB RISER
SWITCH
113-2531
69
46
39
23
37
35
27
29
04
26
24
22
62
59
45
03
51
64
63
61
28
32
19
25
5
3
4
DIODE
147-0934
HAMMER
SWITCH
8U-7284
OVERLOAD WARNING
DEVICE SWITCH
5W-9372
LOWER
WIPER SW
5W-9744
UPPER
WIPER SW
180-2649
TRAVEL LOCK
SWITCH
8U-6357
PARKING
BRAKE SW
133-8327
OSC AXLE
LOCK SW
133-8327
CREEPER
SPEED SW
5W-9372
BK/GN/RD(7)
PK(13)
GY(12)
GY(13)
BK/GN(2)
GY
BK/GN/RD(6)
BK/GN/RD(2)
BK
BKBK
BK/GN(11)
BK/WH(1)
OR(2)
RD/YL
(31)
BK
PU(1)
BK
GY
GY
WH(6)
YL(18)
BK/WH(3)
GN(8)
BK
YL(18)
WH(6)
BK/GN(7)
BK(12)
GN(8)
BU(10)
GN(9)
BK
RD(2)
YL(9)
BK
GY
GY
BK
RD/YL(7) WH(1)
(5)
(27)
YL(1)
WH(1)
WH
RD
BK
BR
RD/YL(12)
BU/YL(3)
BK
BK
YL(1)
OVERLOAD WARNING
DEVICE SWITCH
118-5501
L2
L58
L53
L68
L55
L67
L55
L67
OR(2)
HEATER FAN
173-7421
RESISTOR
122-2373
D
D
B
B
B
B
B
B
E
B
B
B
YL(9)
BK/WH(4)
BK
L79
BK
GY
PU(2)
TRANS SPEED
SWITCH
5W-9372
HARNESS AS
DIODE
142-9472
GY(1)
UPPER
WASHER SW
2U-6635
BK
GY
GY/BK(1)
BU(21)
GY(15)
WH(20)
GY(14)
WH(20)
BR(11)
BK(11)
GY(11)
BK(11)
GY(11)
PK(1)
OR(7)
GN(20)OR(6)
PK(5)
CAB RISER
SWITCH
133-8327
TO FRAME
BK
B B
B
3
7
2
10 9
4
1
8
MOTOR
5
4
9
10
2
7
50A
5 7
1
9
10
5
7
2
9
10
6
1
8
5
7
2
9
10
6
1
8
1
2
3
BR
BK
BU
5 7
1
9
10
1 5
9
10
1 5
9
10
2
8
3
910
1
5
5 7
1
9
10
RD
BK
GY
BU
(UP)
04
03
02
01
CAB RISER
(DOWN)
5
7
2
9
10
6
1
8
STEP DOOR
SAFETY SW
152-1620
PILOT CONTROL
LOCK SW
5W-9372
BEACON SW
5W-9372
TRAVEL ALARM
CANCEL SW
8U-6357
REAR FLOOD
LAMP SW
5W-9372
FRONT FLOOD
LAMP SW
5W-5867
HEAD
LAMP SW
5w-5867
RD/YL
RD/YL
BK/GN/RD(3)
BK/GN/RD(3)
RD/YL(1)
BK(6)
RD/YL(6)
BK(1)
BK/WH(5)
BK
BK/YL(1)
BU/WH(1)
GY
RD/YL(17)
GY
GY
GY
GY
GY
BU/WH(1)
BK/YL (1)
BK
BK
BK
BK
BK
BK
BK
RD(7)
RD/YL (11)
GN/BR(3)
GN/BR(4)
GN/BU(4)
GN/WH(4)
GY(4)
WH(4)
TO FRAME RD/YL(12)
BU/YL(3)
YL(1)
BK (1)
L1
L70
L68
GY
B
B
B
B
B
B
B
BU(4)
RD/YL(18)
BU/YL(5)
BK
BR/WH(1)
BU(2)
RD(1)OR(3)
BR/BK(2)
BR/WH(3)
BR(7)
GN(21)
WH(17)
YL(12)
BK
BK
YL(12)
BK
BK
GN/BR(5)
RD/YL(18)
BK/GN(9)
BK
YL(10)
BU/YL(5)
BK/WH(4)
BK/GN(11)
GN/WH(1)
WH(2)
BU(4)
GN(3)
BR/WH(1)
BU(2)
RD(1)
GN/BR(1)
BK(7)
WH(3)
BK/GN(1)
BK(8)
RD(1)
BU(2)
BR/WH(1)
GN(3)
RD/YL(2)
BU(4)
WH(2)
GN/WH(1)
OR(3)
BU(1)
RD/YL(9)
BR/WH(2)
BR/BK(1)
PU(3)
RD(4)
YL(9)
BK
TO FRAME
L79
L79
L55
L69
L35
L35
YL(10)
BU/YL(5)
GN(20)
3
910
3
7
2
10 9
4
1
8
6
8
2
3
5
1
7
HAZARD SW
5W-9351
10
RD/YL(2)
BK(7)
WH(3)
BK(8)
GN/BR(1)
BK/GN(9)
GY
GY
BK/GN(1)
GN/BR(5)
2
6
3
910
5 7
1
9
10
+ V
SIGNAL
GROUND
REVERSE STEER
PROX. SW
151-1953
5 7
1
9
10
5 7
1
9
10
1
HYD OIL HIGH TEMP
2
+ 24 VOLT
3
POWER MODE II
1
GND
2
NC
3
NC
4
ENGINE OIL PRESS
5
ALTERNATOR
6
NC (+ 24 VOLT)
7
HYD OIL LOW TEMP
1
2
3
4
5
6
7
HYD OIL TEMP
COOL TEMP
FUEL LEVEL
NC
C
E
MONITOR
PANEL
175-7204
A
B
C
RD
GN(2)
BK/GN/RD (1)
BK/GN/RD (8)
RD/YL(8)
GN(10)
BK/GN/RD(9)
GY(2)
BK(1)
(6)
BK(6)
(1)
RD(5)
BK/YL/WH(2)
RD/YL(30)
GN/BR(2)
GN(29)
RD/YL(16)
BK
BK
BK
BU(2)
BU(5)
L61
L70
L64
L62
L64
AIR SUSPENDED
DRIVER SEAT
BK/YL/WH(1)
WH(14)
GN(13)
BK
L77
L77
L78
BRAKE/
TRAVEL
CUTOFF
117-4861
B
B
B
B
A
A
A
YL(9)
GN/BR(2)
SWING BRAKE
SWITCH
113-2531
GN
YL
GN(22)
BK/GN(3)
L25
BU(18)
BU(3)
L90
2
6
+
-
PLUG
120-5967
STARTING/
PILOT PRESS
ENABLE SWITCH
117-3187
1 3 2 4
+ -
HOUR METER
120-5966
85
86
30
87
87a
RD
BK
GY
BU
AUX HYD
SWITCH
113-2531
(CCW ROTATION)
04
03
02
01
AUX HYD
(CW ROTATION)
FLOOD LAMP
120-6776
FLOOD-LAMP
120-6776
REAR WORK
LAMP AS.
120-6776
BK/WH(5)
BK/WH(6)
BK
BK
BK
BU/WH(1)
REFUELING
PUMP SWITCH
8U-3011
TO BOX
(14)
YL(4)
BU-10(2)BU-10(1)
(16)
(10)
(2)
BK
H
H
H
A
A
TRAVEL
CUTOFF
117-4861
GN(28)
GN(16)
ALARM
CAB RISER
117-4861
BK
BK
BK/GN(8)
GN(6)
PK(1)
+BATTERY
ALARM
PRESS.SW
SHUTDN.SW
GROUND
TRAVEL
ALARM
RELAY
122-2371
BK
BK
BK
BK
BK
1
2
3
4
85
86
30
87
87a
85
86
30
87
87a
GN/BR(3)
GN/BU(2)
BK/YL/WH(2)
WH(3)
BK/GN(4)
GN/WH(2)
BU/YL(3)
BR(10)
BR(11)
PK(13)
BR(1)
GN/BR(4)
BU(13)
BK
RD(6)
BK
BU(1)
RD(25)
BK
BK
TO FRAME
BK(18)
WH(7)
L34
L27
BK
C
C
W
G
C
BK
BK
BK BK
BU(20)
PU(19)
BK
01
08
06
05
04
03
07
02
01
02
BK
BK
1
2
PRIMARY
STEERING
FLOW SW
3E-6429
31
31b
15
53e
53c
SWING BRAKE
TIMER RELAY
155-4574
I
BK
GN/BR(4)
BR (1)
BU/YL(3)
BKBU(13)
AIR
HORN SW
5W-9376
TRAVEL
PEDAL SW
136-9421
REVERSE
STER LIGHT
164-8366
TO
PLATFORM
BR
DK-BU
GN/YL
BK
0
TO CAB TO FRAME
L34
L34
BK
BU(13)
BK
WH
BK
WH
G
C
C
Z
DD
Z
BU(20)
PU(19)PK(13)
BR(11)
BR(10)
TRAVEL LOCK
MAGNET
116-1146
HORN/TURN
HIGH BEAM SW
111-1975
GN/BR
YL
WH/BK
BK/WH
BK/GN
BK/WH/GN
WH
BR
56B
71A
56
R
L
54
56A
H
STOP LAMP CUTOFF/
OSCILLATING AXLE
BLOCKED SWITCH
174-8209
32 41
RADIO
165-5934
SPEAKER
5W-8937
SPEAKER
5W-8937
DOME LIGHT
5W-2041
CIGAR LIGHTER
5W-9628
UPPER WIPER
122-2367
UPPER WINDSHIELD
122-2369
TO CAB
BK
BK/YL
RD
GY
BK
YL(14)
YL(14)
BK
RD
GY
PU(7)
BK
BK
GY/BK(2)
BK(12)
GY(7)
GY/BK(1)
BK/GN(10)
BK-14
YL(2)
L75
L75
H
H
H
H
H
BR/RD
BR
BR
BR/RD
2.5A
ANTENNA
ANTENNA
SPEAKER
GROUND
+BATT.
SPEAKER
SPEAKER
SPEAKER
MOTOR
H
G
53
31B
53A
31
BK/YL(1)
PU (7)
YL(2)
GY/BK(1)
GY(7)
BK/PU(1)
GN(8)
BK/GN(10)
BK (12)
BU/WH(1)
BK/WH(5)
BK-14
PU (7)
OR(1)
BK
PU(7)
CONVERTER
24V-12V
120-6566
BK(12)
GY(7)
BK/GN(10)
GN(8)
BK/PU(1)
BU/WH(1)
BK/WH(5)
BK/YL(1)
YL(2)
GY/BK(1)
TO FRAME
BK
L63
L70
L68
L63
L68
H
B
H
B
BK-14
L69
09
10
03
02
11
07
12
01
08
06
04
05
24V
12V
GND
LOWER WINDSHIELD
137-7245
BK-14BK-14
L2
L68
BK
GN/WH(1)
BK/GN(9)
GN/BR(5)
BK
YL(12)
WH(2)
BK/GN(11)
GN(3)
YL(10)
BK/WH(4)
RD(4)
PU(3)
BR/BK(1)
BR/WH(2)
RD/YL(9)
BU(1)
YL(9)
L69
1
GND
2
3
TURN SIGNAL
4
TURN SIGNAL
5
POWER MODE III +
6
POWER MODE III -
7
PARKING BRAKE
4
TRANS SPEED II
5
ENG COOL HIGH TEMP
6
POWER MODE I
7
TRANS SPEED I
1
2
3
4
5
6
7
SUPPL STEERING
SUPPL STEERING
HYD FILTER
AIR FILTER
+ 24 VOLT
BRAKE LOW PRESS
OVERLOAD
HIGH BEAM
AB
D
1
3
2
BR
BK
ENGINE
SPEED DIAL
141-6258
ANTENNA
5W-9391
BEACON
116-9627
(1)
BK(1) WH
BKBK
WH-14
BK-14
GY(8)
BK
BK
BK
BK
BK
GY(4)
GY(8)
WH(4)
RD/YL(11)
GN/BR(3)
GN/BR(4)
GN/BU(4)
GN/WH(4)
TURN SIGNAL
LAMP AS.
116-9626
FLOOD
LAMP AS.
120-6775
BK
BK
BK(8)
GY(3)
GN/WH(3)
GN/BU(3)
TURN SIGNAL
LAMP AS.
116-9626
TO FRAME
BR
BU
BR
BU
LEFT FRONT
STABILIZER
LOCKOUT SOL
8U-6424
RIGHT FRONT
STABILIZER
LOCKOUT SOL
8U-6424
BK/GN(7)
BK/WH(3)
BK/PU(2)
LOWER WIPER
6C-9156
TO FRAME
BKSTICK TRAVEL
LAMP AS.
8U-4742
BK(18)
FORWARD
HORN
153-6559
RD(7)
BK
BK
COMPRESSED
AIR HORN
5W-9400
L28
L28
BR
BU
BLADE FRONT
SOLENOID
8U-6424
BB
AA
H
C
C
C
D
D M
D
D
D
D
56B
56A
58
31
HEAD
LAMP AS.
2U-4800
POSITION
LAMP
5W-2033
+
-
PLUG
120-5967
56B
56A
58
31
HEAD
LAMP AS.
2U-4800
POSITION
LAMP
5W-2033
1
2
MOTOR
H
G
53
31B
53A
31
02
01
04
03
02
01
04
03
ELECTRICAL FUEL LIFT PUMP 25
WARNING LIGHT; START/STOP SOLENOID 7,5
STARTER KEY SWITCH; MAIN POWER-RELAY; LIGHT 15
POTENTIAL TRANSFORMER 24V ==> 12V (RADIO) 7,5
START/STOP RELAY 7,5
COMPRESSOR AIR HORN 15
FAN; START AID 15
CIGARETTE LIGHTER; PLUG; DOME LIGHT 7,5
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF.
UNLESS OTHERWISE SPECIFIED:
ALL WIRE IS 16 GAUGE
ABBREV COLOR
BK BLACK
BR BROWN
BU BLUE
GN GREEN
GY GRAY
OR ORANGE
PK PINK
PU PURPLE
RD RED
WH WHITE
YL YELLOW
M318 M320
IDENT PART-NO. LOC
A
179-9080 C-5
B
179-9059
C-5
C
E-6
D
174-9110
C-6
E
179-9047
C-6
F
179-9049
C-6
G
179-9045
B-6
H
179-9082
C-1
J
K
L
140-1059
F-8
M
120-6919
C-1
N
121-0875
F-7
P
121-0876
E-7
R
121-0877
F-7
T
121-0879
F-7
U
122-2360
C-8
V
158-2910
D-7
W
180-8508
E-7
X
122-2364
E-7
Y
121-2972
E-5
Z
121-2973
E-1
AA
122-2365
E-1
BB
122-2366
E-5
CC
122-2382
C-8
DD
8X-9618
E-1
139-8284 B-6
EE
123-6475
C-7
FF
126-6801
F-7
GG 145-9203 C-7
PART-NO.
179-9060
138-4515
138-4514
180-8137
E-7
179-9071
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.
MONITOR CIRCUIT.
PANEL LAMP CIRCUIT.
TURN SIGNAL AND WIPER/WASHER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
ENGINE AND PUMP CONTROL CIRCUIT.
WIRES THAT HAVE BATTERY VOLTAGE WHEN
THE KEY SWITCH IS ON AND THE LEFT HAND
HYDRAULIC CONSOLE IS LATCHED IN THE
DOWN POSITION.
START AID CIRCUIT.
THIS SCHEMATIC IS FOR THE M318/M320
EXCAVATOR (179-9031).
1
2
CONN 1
CONN 2
CONN 6
CONN 5
CONN 3
CONN 4
CONN 7
CONN 8
CONN 9
CONN 10
CONN 11
CONN 12
CONN 12
CONN 13
CONN 14
CONN 15
CONN 17
CONN 16
CONN 16
