
©2001 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR1115-02
April 2001
312B and 312B L Excavator
Electrical System
312B:
6SW1-UP
9NW1-UP
312B L:
9FS1-UP
2KW1-UP
Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
Actuator - Engine Gov. B-7 1 Sender - Coolant Temp B-8 18
Air Heater C-8 2 Sender - Hyd. Oil Temp B-7 19
Alarm - Travel D-9 3 Sensor - Fuel A-2 20
Alternator B-8 4 Sensor - Provision For A/C Photo F-2 E
Batteries F-9 5 Sensor - Pump Discharge Pressure A-9 21
Breaker - Alternator G-9 D Solenoid - A/C Compr Clutch A-9 18
Breaker - Main G-9 D Solenoid - Blade C-7 22
Buzzer - Overload Warning F-5 A Solenoid - Cold Advance B-9 18
Buzzer - Quick Coupler Warning H-3 C Solenoid - Eng/Pump Control A-7 23
Control - Eng/Pump C-4 6 Solenoid - Fuel Pump B-9 18
Control - Wiper E-2 E Solenoid - Hammer G-2 F
Converter - 24V to 12V B-5 7 Solenoid - Hyd. Lock G-2 F
Diodes
G-7, H-7,
I-6, I-9
D Solenoid - Level Finish A-7 23
Fuses - 10A & 15A I-4, I-5, I-6 B Solenoid - Medium Pressure Valve A-2 22
Ground - Cab A-6 A Solenoid - Quick Coupler HP Close A-2 8
Ground - Cab D-2 E Solenoid - Quick Coupler HP Open A-2 8
Ground - Chassis B-3 8 Solenoid - Quick Coupler LP G-2 F
Ground - Chassis B-8 4 Solenoid - Start Aid F-9 24
Ground - Platform D-5, G-3, G-6 F Solenoid - Swing Brake A-2 22
Ground - Relay Panel H-9 D Solenoid - Travel Speed A-7 23
Ground Strap - Chassis G-9 D Solenoid - Trenching A-7 23
Ground Strap - Chassis to Engine A-8 9 Switch - Air Cleaner F-8 D
Ground Strap - Chassis to Platform G-6 10 Switch - Air Heater/ Start Aid E-4 C
Horn C-2 8 Switch - Aux. E-5 C
Indicator - Hyd. Oil Filter A-7 11 Switch - Backup EPR Valve D-4 C
Joystick - Multiswitch LH I-2 B Switch - Backup Gov. D-5 C
Joystick - Multiswitch RH F-3 C Switch - Blade Floating F-3 C
Meter - Service F-2 E Switch - Boom Raise Pressure C-7 22
Monitor F-2 E Switch - Coolant Level E-9 25
Motor - Lower Wiper H-2 12 Switch - Coolant Temp B-9 18
Motor - Starter A-8 9 Switch - Coolant Temp (Start Aid) C-8 18
Motor - Upper Wiper G-1 13 Switch - Disconnect G-9 D
Motor - Washer E-9 D Switch - Engine Oil Level B-8 26
Pickup - Engine Speed B-9 14 Switch - Engine Oil Pressure A-9 18
Pump - Auto Lubrication E-9 15 Switch - Hammer Pressure G-2 F
Pump - Refueling B-2 16 Switch - Hyd. Oil Level B-7 19
Relay - Air Heater I-7 D Switch - Implement Pressure B-7 22
Relay - Aux. Hyd. I-9 D Switch - Key Start E-3 C
Relay - Blade I-7, I-9 D Switch - Neutral Start Limit I-2 B
Relay - Blade Floating I-7, I-8 D Switch - Overload Warning E-4 C
Relay - Boom Lamp J-8 D Switch - Overload Warning Pressure D-2 F
Relay - Cab/Chassis Lamp I-9 D Switch - Quick Coupler I-3 C
Relay - Fan I-7 D Switch - Radio E-4 C
Relay - Horn I-9 D Switch - Refrigerant Low Pressure B-9 18
Relay - Hyd. Lock Sol I-8 D Switch - Refueling A-2 16
Relay - Main H-7 D Switch - Refueling Start B-2 16
Relay - Neutral Start I-7 D Switch - Refueling Stop B-3 16
Relay - Refueling 1 B-2 17 Switch - Rotating Beacon E-5 C
Relay - Refueling 2 B-2 17 Switch - Seat Heater E-4 C
Relay - Start H-7 D Switch - Throttle Position E-3 C
Relay - Timer I-7 D Switch - Travel Pressure B-7 22
Resistor - Air Heater H-7 D Switch - Windshield E-2 A
Resistor - Backup I-9 D Switch Panel F-3 C
Resistor - Coolant Temp H-7 D Unit - A/C H-6 7
Resistor - Fuel Pump H-7 D
Machine locations are repeated for components located close together.
A = Located in 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 floor plate.
Wire Description
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
101 RD Bat (+) 513 OR A/C Compressor/Refrigerant Pressure SW
103 RD Dome Lamp 519 PK Refrigerant Pressure Sw to A/C Unit
105 BR Key Sw 524 BU Wiper Cont. to Lower Wiper Motor
109 OR Alt Output (+) Term. 524 GN Lower Wiper Motor
111 RD Power to Eng / Pump Control 590 GY Intermittent Sw to Wiper Cont.
112 PU Main Power Relay Output A537 PK Seat Heater
113 OR Opr Mon Switch Panel B (+) A586 OR Wash Sw to Wiper Cont.
114 GN Warning Horn (Forward) A588 GN Hyd. Lock Solenoid
115 PK Cab/Chassis Lamps C537 GN A/C Photo Sensor (+)
116 BR Fan Relay C538 OR A/C Photo Sensor (-)
118 GY Washer/Wiper C576 BU Med. Pressure Sw 1 to Med. Pressure Valve
120 YL Converter C577 GY Med. Pressure Sw 2 to Med. Pressure Valve
124 GN A/C C578 YL Radio Sw
129 BU Cigar Lighter C588 BR Blade Sw to Blade Relay
135 BU 12V Socket C589 GY Blade Relay To Solenoids
139 OR 12V Radio Memory C591 PK Floating Blade Relay To Floating Blade Sol.
140 BU Auto Lubrication Pump C592 WH Diodes to Relays
147 PU Seat Heater C599 OR Blade Floating Sw to Blade Floating Relay
149 PU Boom Lamp E500 YL Blade Floating Relay to Blade Relays
150 RD Hyd. Lock Sw E501 PU Blade Relay to Blade Floating Relay
151 GN Hyd. Lock Coil Relay
152 BU Aux. Ckt 607 PK Chassis Lamp
154 RD Neutral Start Limit Sw 615 YL Cab Lamps
168 RD Refueling Pump 616 BU Boom Lamps
172 RD Engine Gov. Actuator 633 BU Attach Lighting Ckt
176 YL Aux. Ckt 638 WH Rotary Beacon
177 RD Main Breaker
180 GN Aux. Ckt 763 BU Travel Speed Sol.
185 YL Backup 779 WH Coupler Close Sol
189 RD Aux. Ckt 780 PU Coupler Open Sol
191 WH Aux. Ckt 786 GN Boom Lamp Relay
788 YL Engine Sped Sensor (+)
200 BK Main Chassis 791 PK Chassis Lamp Relay
201 BK Operator Monitor Return A755 PK Throttle Sw #1
210 BK Converter Output Gnd. A756 BU Throttle Sw #2
235 BK Eng/Pump Control Gnd. A757 GY Throttle Sw #3
A758 BR Throttle Sw #4
304 WH Starter Relay No. 1 Output A761 PU Engine Gov Actuator Feedback
306 GN Start Relay Coil A762 PU Engine Speed Sensor (-)
307 OR Key Start Sw A768 BU Eng/Pump Cont. Sol (+)
308 YL Main Power Relay Coil A769 GY Eng/Pump Cont. Sol (-)
310 PU Start Aid SW To Start Aid Relay A770 PK Electronic Pump Control Bypass Sw to Resistor
311 WH Start Aid Sw to Key Sw A771 PU Implement Pressure Sw
320 OR Horn Relay Coil F771 OR Governor Actuator (A)
321 BR Travel Alarm F772 WH Governor Actuator (B)
322 GY Warning Horn (Forward) F773 OR Governor Accel
323 WH Fuel Pump Power F774 WH Governor Decel
325 PK Refueling Stop Sw K779 PU Alternator D Terminal
327 PK Fuel Pump Solenoid 877 YL Air Heater Indicator
334 BU Air Heater Resistor 878 OR Start Aid Sol
365 YL Refueling Relay Coils to Sw 954 GN Hammer Pressure Sw
376 GN Coolant Temp Sw 955 BU Hammer Sol
399 OR Cold Advance solenoid K904 GN Discharge Pump Pressure Sensor
K905 RD Eng / Pump Control Power
Power Circuits Accessory Circuits (Continued)
Lighting Circuits
Control Circuits
Monitoring Circuits
Basic Machine Circuits
Ground Circuits
403 GN Alternator (R) Term. K906 GN Swing Brake Sol
405 GY Opr Mon Oil Press. (Low Setting) K907 BU Swing Brake Sol Signal From Eng/Pump Cont.
412 BU Opr Mon Coolant Level K909 BU Backup Sw
430 BU Opr Mon Air Filter K911 PK E/P Controller - RS 485 (+)
487 OR Hyd. Oil Filter Indicator K912 GN E/P Controller - RS 485 (-)
491 PK Hyd. Oil Temp Sensor K997 BU Monitor +B Output
492 GY Coolant Temp Sensor L908 OR E/P Controller RS-232C (TX)
495 GN Fuel Level Sensor L909 BU E/P Controller RS-232C (RX)
496 WH Hyd. Oil Level Sw L968 OR EPR Valve (-)
C468 BU Engine Oil Level L969 WH EPR Valve (+)
H414 YL Overload Warning Switch to Buzzer L970 GY Aux. Hyd. Pressure Sw
H415 BR Overload Warning Pressure Switch to Buzzer L971 GN Travel Pressure Sw
L972 BU Low Idle and Pressure Raise Sw
500 BR Wiper - Front (Park) L974 GN Boom Raise Pressure Sw
501 GN Wiper - Front (Low) L976 GN Refueling Start Sw to Refueling Relays 1 & 2
506 PU Washer - Front L977 YL Level Finish Sol
508 PU Radio Speaker - Left L978 GY Trenching Sol
509 WH Radio Speaker - Left (Common) P975 OR Quick Coupler Warning Buzzer
511 BR Radio Speaker - Right P976 BR Quick Coupler Sol
512 GN Radio Speaker - Right (Common) 8630 BU Rotating Beacon Sw
Accessory Circuits
9
10
15
2
18
19
21
26
7
Machine Harness Connector And Component Locations
A
B
C
D
D
3
5
6
7
8
14
20
22
27
5
23
3
15
14
2
21
1
24
4
18
9
25
26
11
19
8
10
27
6
17
16
F
B
C
12
13
24
1
23
11
22
20
17
16
F
13
12
E
E
A
25
4
Code Description of Problems
1301 Engine oil pressure is too low.
1302 Engine coolant temperature is too high.
1303 Hydraulic oil temperature is too high.
1304 Air filter is clogged.
1305 Battery voltage is not normal.
2201 Governor actuator feedback sensor circuit is open or shorted to battery voltage.
2202 Governor actuator feedback sensor circuit is shorted to body ground.
2301 Governor actuator feedback signal is not stable.
2302 Governor actuator feedback signal deviates.
2303 Governor actuator does not move.
2304 Calibration data error.
3201 Monitor RAM is not normal.
4101 Electric power supply to the controller is too much (43 volts).
4102 Over-current in proportional reducing valve.
4103 Proportional reducing valve circuit is open.
4104 Monitor power supply (digital output) over current.
4105 Over-current in digital output (trenching solenoid).
4106 Over-current in digital output (fine control solenoid).
4107 Over-current in digital output (travel speed change solenoid).
4108 Over-current in digital output (travel alarm).
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
Connector Location
Connector Number
Schematic
Location
Machine
Location
CONN. 1 - S.I.S. Connector H-9 D
CONN. 2 G-9 D
CONN. 3 G-8 D
CONN. 4 G-8 D
CONN. 5 G-8 D
CONN. 6 E-8 D
CONN. 7 E-8 D
CONN. 8 E-8 D
CONN. 9 D-8 D
CONN. 10 G-7 D
CONN. 11 F-6 F
CONN. 12 F-6 F
CONN. 13 E-6 F
CONN. 14 E-6 F
CONN. 15 E-6 F
CONN. 16 C-6 10
CONN. 17 C-6 10
CONN. 18 C-5 10
CONN. 19 C-5 10
CONN. 20 B-5 F
CONN. 21 B-5 F
CONN. 22 C-5 F
CONN. 23 C-5 27
CONN. 24 H-5 F
CONN. 25 H-5 F
CONN. 26 H-4 F
CONN. 27 H-4 F
CONN. 28 I-3 C
CONN. 29 D-3 F
CONN. 30 B-3 16
CONN. 31 A-2 20
CONN. 32 B-2 16
CONN. 33 B-2 16
CONN. 34 C-2 8
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.
Related Electrical Service Manuals
Form Number
Alternator: 109 - 2362 SENR3685
Engine/Pump Control: 132 - 7834 SENR9291
Starting and Charging: SENR9292
Title
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.
Resistor, Sender and Solenoid Specifications
Part No. Component Description Resistance (Ohms)
1
3E - 1906 17.6 ± 0.6
3E - 6332 6.0
41 - 5394 6130 to 7500
5L - 2854 4.0 ± 0.2
102 - 8016 47.00 ± 2.35
111 - 9916 11.7 ± 1.2
112 - 4009
20824 - 25451 @ 0 C (32 F)
6134 - 7496 @ 25 C (77 F)
475 - 522 @ 100 C (212 F)
121 - 1490 32.0 ± 3.2
121-1491 32.0 ± 3.2
140 - 2238 25.00 ± 0.25
1
At room temperature unless otherwise noted.
Resistor Coolant Temp
Sender - Coolant Temp
Resistor - Backup
Solenoid - Engine/Pump Control
Solenoid - Level Finish
Solenoid-Trenching
Solenoids -Hydraulic
Lock Solenoid - Swing Brake
Solenoid - Travel Speed
Solenoid - A/C Clutch
Solenoid - Start Aid
Sender - Hydraulic Oil Temp
Resistor - Fuel Pump
Off Machine Switch Specification
Part No. Function Actuate Deactuate
Contact Position
8N-1693 Coolant Temperature
37.8 ± 2.8 C
(100 ± 5 F)
26.7 C MIN
(80 F MIN)
Normally Closed
106-0179
Implement Pressure
Travel Pressure
1225.0 ± 98.0 kPa
(177.67 ± 14.21 psi)
882.0 kPa MIN
(127.92 psi MIN)
Normally Open
106-0180 Boom Raise Pressure
2646.0 ± 196.0 kPa
(383.77 ±28.43 psi)
2156.0 ± 196.0
(312.7 ± 28.43 psi)
Normally Open
106-0181 Hammer Pressure
490.0 ± 49.0 kPa
(71.07 ± 7.11 psi)
290.0 kPa MIN
(42.06 psi MIN)
Normally Open
107-0611 Engine Oil Pressure
93.0 ± 21.0 kPa
(13.49 ± 3.05 psi)
70.0 ± 21.0 kPa
(10.15 ± 3.05 psi)
Normally Open
113-3444 Refrigerant Hi/Lo Pressure
196 to 3140 kPa
1
(28.4 to 455.4 psi)
_
_
Normally Open
1
With increasing pressure the closed condition can be maintained up to 2800 kPa (405 psi), with decreasing pressure the closed condition can be maintained
down to 170 kPa (25 psi).

A
878-OR-18
L25
L7
L7
111-4871
FAN RELAY
L25
L14
L10
L20
L21
L16
CONN 11
L17
L23
L22
RELAY PANEL
CC
L22
L21
ZZ
YY
A588-GN-18
168-RD-18
B
BB
2
1
WW
UU
YYVV
XX
VV
ZZ
SS
UU
SS
308-YL-18
WW
112-PU
A
B
C
200-BK-18
200-BK
200-BK-18
1
2
334-BU-14
327-PK
310-PU-18
112-PU-18
112-PU
327-PK
334-BU-14
877-YL-18
5L-2854
RESISTOR
FUEL PUMP
878-OR-18
C577-GY-18
C576-BU-18
8630-BU-18
780-PU-18
877-YL-18
A
1
2
3E-6332
AID SOL
ATCH START
877-YL-18
C589-GY-18
638-WH
152-BU
1
2
3
4
5
K779-PU-18
140-BU
140-BU
200-BK
200-BK
334-BU-14
112-PU-6
134-3344
GROUND STRAP
112-PU-18
112-PU
112-PU
327-PK
403-GN-18
131-0398
WIPER MOTOR
LOWER
C
403-GN-18
118-GY
403-GN-18
200-BK
524-BU
118-GY
A
524-BU
118-GY
L970-GY-18
C
376-GN-18
C599-OR-18
191-WH-18
200-BK-18
878-OR-18
878-OR-18
A
638-WH
8630-BU-18
152-BU
152-BU
152-BU-18
8630-BU-18
638-WH
308-YL-18
200-BK-18
200-BK-18
310-PU-18
877-YL-18
235-BK
L908-OR
L909-BU
L908-OR
CONNECTOR
CONN 1
S.I.S.
L909-BU
235-BK
A
B
C
D
E
235-BK
L909-BU
L908-OR
L23
308-YL-18
XX
115-PK-14
200-BK-18
116-BR-14
334-BU-14
877-YL-18
121-1022
DIODE
877-YL-14
7W-1251
RESISTOR
AIR HEATER
177-RD-14
177-RD-14
12
615-YL
607-PK-18
310-PU-18
791-PK-18
7
4
2
1
3
304-WH-8
327-PK
114-RD-18
322-GY-18
320-OR-18
11
334-BU-14
C588-BR-18
E501-PU-18
786-GN-18
149-PU
111-4871
RELAY
FLOATING
BLADE
C
616-BU
200-BK-18
151-GN-18
176-YL-18
116-BR-14
9S-0174
MAIN BREAKER
177-RD-6101-RD-6
60A
K909-BU-18
K909-BU-18
177-RD-8
177-RD-14
177-RD-8
177-RD-14
177-RD-14
A588-GN-18
177-RD-14
114-RD-18
320-OR-18
177-RD-14
200-BK-18
308-YL-18
308-YL-18
177-RD-14
114-RD-18
322-GY-18
A770-PK-18
10
111-4871
RELAY
BOOM LAMP
111-4871
HORN RELAY
9
8
11
7
1
2
12
3
6
616-BU
121-1023
BLOCK
149-PU
200-BK-18
615-YL
154-RD-18
112-PU-6
786-GN-18
786-GN-18
791-PK-18
320-OR-18
60A
5
4
5
114-RD-18
189-RD
115-PK-14
115-PK-14
6
109-RD-6
K909-BU-18
A588-GN-18
111-4871
LAMP RELAY
CAB/CHASSIS
200-BK
176-YL-18
151-GN-18
3T-0376
MAIN RELAY
615-YL
607-PK-18
791-PK-18
101-RD-6
A588-GN-18
101-RD-6
115-PK-18
176-YL-18
111-4870
TIMER RELAY
A
K909-BU-18
151-GN-18
200-BK-18
111-RD-14
177-RD-14
189-RD
111-RD-14
200-BK-18
307-OR-18
149-PU-18
149-PU
1
4
BK-00
200-BK-18
RELAY PANEL
177-RD-14
304-WH-8
A770-PK-18
K909-BU-18
200-BK-18
A770-PK-18
A770-PK-18
200-BK
200-BK
DD
CHASSIS
3
9
8
2
101-RD-6 109-RD-6
607-PK-18
322-GY-18
616-BU
K779-PU-18
K909-BU-18
12
11
10
9
8
7
1
2
6
4
3
5
111-4871
RELAY
HYD LOCK SOL
10
102-8016
RESISTOR
BACKUP
1
2
3
4
5
6
308-YL-18
RELAY PANEL
B
B
C
CONN 10
CONN 5
CONN 4CONN 3CONN 2
A
A
C
A
CC
IN 2
GND
IN 1
+B
OUT 2
OUT 1
304-WH-8
9S-0174
ALT BREAKER
DD
7N-0718
DISCONNECT SW
308-YL-18
307-OR-18
111-RD-14
151-GN-18
176-YL-18
A588-GN-18
200-BK
K909-BU-18
115-PK-14
189-RD
114-RD-18
320-OR-18
791-PK-18
786-GN-18
154-RD-18
615-YL
149-PU
322-GY-18
607-PK-18
306-GN-18
616-BU
200-BK-18
125-1302
START RELAY
177-RD-14
177-RD-14
2
1
177-RD-14
177-RD-14
200-BK
877-YL-18
154-RD-18
200-BK-18
177-RD-6
K909-BU-18
200-BK-18
116-BR-14
177-RD-14
189-RD
111-RD-14
877-YL-18
308-YL-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
615-YL
115-PK-14
607-PK-18
616-BU
149-PU
786-GN-18
320-OR-18
322-GY-18
114-RD-18
791-PK-18
A588-GN-18
176-YL-18
151-GN-18
111-RD-14
189-RD
177-RD-14
307-OR-18
154-RD-18
116-BR-14
116-BR-14
A770-PK-18
L908-OR-18
C589-GY-18
306-GN-18
308-YL-18
111-4871
RELAY
NEUTRAL START
200-BK-18
307-OR-18
154-RD-18
177-RD-14
116-BR-14
308-YL-18
308-YL-18
C591-PK-18
327-PK
112-PU-18
308-YL-18
112-PU-18
L909-BU-18
310-PU-18
200-BK-18
C589-GY-18
310-PU-18
200-BK-18
877-YL-18
200-BK-18
310-PU-18
C588-BR-18
180-GN-14 877-YL-14
111-4871
RELAY
AIR HEATER
235-BK-18
200-BK-18
235-BK-18
376-GN-18
121-1022
DIODE
K779-PU-18
112-PU-18
L908-OR-18
L909-BU-18
200-BK
200-BK-18
L L
E
131-0399
WIPER MOTOR
UPPER
122-4829
MULTISWITCH JOYSTICK-LH
5I-8250
CAB LAMP
E LL
200-BK
615-YL
615-YL
200-BK
A
MOTOR
-
B
S
+
C
200-BK
524-BU
118-GY
E
615-YL
615-YL
BK
GY
RD
BU
GN
YL
H
MED PRESS SW
MED PRESS SW
HORN SW
H
H
H
H
H
191-WH-18
E500-YL-18
180-GN-14
C592-WH-18
180-GN-14
C592-WH-18
878-OR-18
A588-GN-18
C577-GY-18
C577-GY-18
C576-BU-18
6
C577-GY-18
C576-BU-18
C576-BU-18
A
200-BK-18
C592-WH-18
200-BK-18
A
200-BK-18
955-BU-18
121-6303
ATCH HAMMER SOL.
2
1
955-BU-18
C599-OR-18
C588-BR-18
C588-BR-18
111-4871
AUX HYD RELAY
200-BK-18
L970-GY-18
191-WH-18
191-WH-18
191-WH-18
111-4871
BLADE RELAY
E500-YL-18
191-WH-18
200-BK-18
C588-BR-18
K909-BU-18
C588-BR-18
C588-BR-18
C588-BR-18
E500-YL-18
C599-OR-18 C599-OR-18
200-BK-18
191-WH-18
RELAY 111-4871
BLADE FLOATING
C589-GY-18
C591-PK-18
C589-GY-18
C591-PK-18
E500-YL-18
200-BK-18
E501-PU-18
200-BK-18
E500-YL-18
111-4871
BLADE RELAY
C589-GY-18
C591-PK-18
307-OR-18
200-BK-18
310-PU-18
180-GN-14
200-BK-18
200-BK-18
191-WH-18
C599-OR-18
376-GN-18
200-BK-18
L970-GY-18
C589-GY-18
ON
C591-PK-18
P976-BR-18
CONN 28
200-BK-18
C592-WH-18
C588-BR-18
191-WH-18
L970-GY-18
C589-GY-18
C591-PK-18
779-WH-18
180-GN-14
180-GN-14
C592-WH-18
C599-OR-18
200-BK-18
C591-PK-18
C589-GY-18
780-PU-18
A588-GN-18
START
ACC
R2
780-PU-18
779-WH-18
C588-BR-18
C588-BR-18
200-BK
779-WH-18
780-PU-18
M
780-PU-18
779-WH-18
6
M
200-BK-18
200-BK
780-PU-18
M
A588-GN-18
779-WH-18
P976-BR-18
P975-OR-18
M
M
7Y-3918
SWITCH AS
ATCH QUICK COUPLEUR
376-GN-18
1
2 376-GN-18
112-PU-18
A
200-BK-18
P976-BR-18
LP SOL. 121-6303
ATCH QUICK COUPLER
2
1
A588-GN-18
140-2238
RESISTOR AS
376-GN-18
112-PU-18
M
200-BK-18
P975-OR-18
M
113-4683
WARNING BUZZER
ATCH QUICK COUPLER
C
B
L970-GY-18
R1
BR
1
2
3
4
5
7
8
PREHEAT
OFF
C588-BR-18
112-PU-18
524-GN
200-BK
200-BK
524-GN
+
S
-
MOTOR
118-GY
C599-OR-18
878-OR-18
877-YL-18
C592-WH-18
779-WH-18
C577-GY-18
C576-BU-18
A
B
6
5
4
3
2
1
C599-OR-18
180-GN-14
C592-WH-18
121-1022
DIODE
C592-WH-18
C592-WH-18
L970-GY-18
A588-GN-18
1
2
154-RD-18
151-GN-18
150-RD-18
111-4799
LIMIT SW
NEUTRAL START
320-OR-18
200-BK-18
200-BK-18
121-1491
HYD LOCK SOL
P976-BR-18
200-BK-18
PLATFORM
H
A588-GN-18
200-BK-18
200-BK-18
954-GN-18
A
A
200-BK
954-GN-18
106-0181
PRESS. SW
HAMMER
ATCH
OPERATOR STATION
BK-00 RD-00 RD-00
200-BK-18
200-BK
127-5264
LUBRICATION PUMP
ATCH AUTO
1
2
ON(KEY)
GROUND
A
304-WH-8
L971-GN-18
POS
NEG
NEG
POS
9X-3404(NOTE B)
3T-5760
BATTERY
140-BU
487-OR-18
506-PU-18
200-BK-18
200-BK-18
412-BU-18
200-BK-18
200-BK
AA
BBCC
321-BR-18
200-BK-18
487-OR-18
487-OR-18
7T-8890
WASHER
MOTOR
096-0744
LEVEL SW
COOLANT
A
200-BK-18
3E-7738
TRAVEL ALARM
ATCH
200-BK-18
430-BU-18
A771-PU-18
412-BU-18
200-BK-18
200-BK-18
200-BK-18
506-PU-18
200-BK-18
321-BR-18
BK
BK/PK
519-PK-18
519-PK-18
109-RD-6
101-RD-4
168-RD-14
334-BU-14
607-PK-18
322-GY-18
616-BU
506-PU-18
K997-BU-18
B
CONN 6
CONN 7
CONN 8
CONN 9
A
763-BU-18
K997-BU-18
763-BU-18
519-PK-18
L977-YL-18
L977-YL-18
403-GN-18
L978-GY-18
492-GY-18
L978-GY-18
L974-GN-18
405-GY-18
788-YL-18
A771-PU-18
A762-PU-18
L974-GN-18
F774-WH-18
K906-GN-18
K906-GN-18
172-RD-18
A761-PU-18
F773-OR-18
496-WH-18
K997-BU-18
K904-GN-18
A771-PU-18
L974-GN-18
A761-PU-18
C468-BU-18
K904-GN-18
495-GN-18
F773-OR-18
F774-WH-18
A761-PU-18
K904-GN-18
491-PK-18
L977-YL-18
L978-GY-18
F773-OR-18
763-BU-18
A768-BU-18
A769-GY-18
K906-GN-18
L971-GN-18
F774-WH-18
172-RD-18
A768-BU-18
492-GY-18
405-GY-18
168-RD-14
C468-BU-18
A762-PU-18
788-YL-18
403-GN-18
495-GN-18
496-WH-18
491-PK-18
A769-GY-18
168-RD-14
327-PK
L971-GN-18
A768-BU-18
412-BU-18
321-BR-18
492-GY-18
405-GY-18
C468-BU-18
A762-PU-18
788-YL-18
A769-GY-18
495-GN-18
496-WH-18
491-PK-18
403-GN-18
172-RD-18
189-RD
K909-BU-18
A588-GN-18
A770-PK-18
791-PK-18
786-GN-18
308-YL-18
307-OR-18
320-OR-18
154-RD-18
114-RD-18
115-PK-14
149-PU
112-PU-6
151-GN-18
177-RD-14
177-RD-14
111-RD-14
176-YL-18
116-BR-14
109-9330
AIR CLEANER SW
A
A
A
B
B
A
A
A
506-PU-18
L970-GY-18
615-YL
487-OR-18
877-YL-18
L971-GN-18
A761-PU-18
K904-GN-18
496-WH-18
430-BU-18
495-GN-18
491-PK-18
492-GY-18
405-GY-18
321-BR-18
C468-BU-18
412-BU-18
763-BU-18
A762-PU-18
788-YL-18
K997-BU-18
L977-YL-18
L974-GN-18
L978-GY-18
A771-PU-18
K909-BU-18
786-GN-18
791-PK-18
A768-BU-18
A769-GY-18
A770-PK-18
F774-WH-18
F773-OR-18
K906-GN-18
307-OR-18
308-YL-18
519-PK-18
111-RD-14
177-RD-14
177-RD-14
140-BU
149-PU
115-PK-14
168-RD-14
114-RD-18
176-YL-18
151-GN-18
154-RD-18
320-OR-18
189-RD
172-RD-18
112-PU-6
615-YL
1
2
4
5
6
3
1
2
3
4
5
6
7
8
9
10
11
12
10
9
8
7
6
5
4
3
2
1
12
11
H H H
147-PU-18
147-PU-18
147-PU-18
147-PU-18
144-3680
A/C UNIT
L17
L7
L19
3
6
L25
147-PU-18
SEAT HEATER
10A
116-BR-14
120-YL
FF FF
120-YL
524-BU
118-GY
C537-GN-18
A588-GN-18
152-BU
152-BU
177-RD-18
C577-GY-18
191-WH-18
C577-GY-18
C576-BU-18
C592-WH-18
C577-GY-18
C576-BU-18
955-BU-18
C538-OR-18
C538-OR-18
1
4
5
2
C537-GN-18
C538-OR-18
124-GN-14
519-PK-18
200-BK-14
A
191-WH-18
A588-GN-18
C537-GN-18
A588-GN-18
C592-WH-18
780-PU-18
P976-BR-18
P976-BR-18
779-WH-18
780-PU-18
200-BK-18
779-WH-18
A588-GN-18
200-BK-18
200-BK-18
P976-BR-18
C592-WH-18
8
A588-GN-18
191-WH-18
191-WH-18
191-WH-18
7
180-GN-14
180-GN-14
A588-GN-18
180-GN-14
C576-BU-18
A588-GN-18
180-GN-14
112-PU-14
C577-GY-18
C592-WH-18
121-1022
DIODE
121-1022
DIODE
C592-WH-18
C576-BU-18
C592-WH-18
113-OR-18
AUX CKT
112-PU-14
116-BR-14
112-PU-14
112-PU-14
113-OR-18
191-WH
115-PK-14
120-YL
152-BU
124-GN-14
129-BU-18
118-GY
113-OR-18
140-BU
149-PU
105-RD-14
103-RD-18
114-RD-18
177-RD-14
112-PU-14
177-RD-14
112-PU-14
112-PU-14
172-RD-18
176-YL-18
185-YL-18
K905-RD-14
189-RD-14
112-PU-14
112-PU-14
111-RD-14
111-4812
FUSE BASE
168-RD-14
116-BR-14
K905-RD-14
10A
150-RD-18
200-BK-18
320-OR-18
15A
10A
10A
10A
10A
180-GN-14
176-YL-18
111-RD-14
112-PU-14
177-RD-18
10A
6
7
BACKUP
185-YL-18
118-GY
WASHER/WIPER
189-RD-14
ENG GOV
172-RD-18
12
11
10
9
8
7
6
5
4
3
2
1
1
2
3
4
5
6
151-GN-18
154-RD-18
112-PU-6
AUX CKT
15A
112-PU-14
E/P CONT
112-PU-14177-RD-14
K905-RD-14
177-RD-14
129-BU-18
118-GY
152-BU
113-OR-18
120-YL
124-GN-14
140-BU
114-RD-18
103-RD-18
105-RD-14
168-RD-14
AUX CKT
CAB/CHASSIS LAMP
200-BK-18
CONVERTER
AUX CKT
191-WH
149-PU
115-PK-14
112-PU-14
CIGAR LIGHTER
A/C /HEATER
10A
189-RD-14
111-RD-14
177-RD-14
112-PU-14
154-RD-18
172-RD-18
320-OR-18
HORN
15A
116-BR-14
DOME LAMP
KEY SW
REFUELING PUMP
BOOM LAMP
LUBRICATOR
10A
177-RD-14
114-RD-18
15A
15A
10A
10A
103-RD-18
AUX CKT
129-BU-18
105-RD-14
HYD LOCK SW
168-RD-14
124-GN-14
149-PU
140-BU
152-BU
120-YL
115-PK-14
191-WH
15A
10A
15A
10A
10A
10A
10A
15A
112-PU-14
OPERATOR STATION
150-RD-18
112-PU-14
8
9
5
4
3
2
1
10
11
176-YL-18
12
185-YL-18
124-GN-14
124-GN-14
H H
H
H
A
CONN 24 CONN 25 CONN 26 CONN 27
113-OR-18
200-BK-14
SWITCH PANEL
112-PU-14
H HH
A AA
112-PU-14
15A 9W-1441
10A 9W-1442
FUSE
185-YL-18
1
2
3
4
5
8
7
6
151-GN-18
519-PK-18
105-RD-14
129-BU-18
118-GY
200-BK-18
K905-RD-14
103-RD-18
111-RD-14
112-PU-14
177-RD-14
177-RD-14
116-BR-14
140-BU
149-PU
115-PK-14
168-RD-14
114-RD-18
176-YL-18
151-GN-18
154-RD-18
320-OR-18
189-RD
172-RD-18
112-PU-14
103-RD-18
103-RD-18
954-GN-18
A588-GN-18
112-PU-6
172-RD-18
189-RD
320-OR-18
154-RD-18
151-GN-18
176-YL-18
114-RD-18
168-RD-14
115-PK-14
149-PU
140-BU
177-RD-14
177-RD-14
111-RD-14
K905-RD-14
118-GY
129-BU-18
105-RD-14
185-YL-18
113-OR-18
200-BK-18
103-RD-18
103-RD-18
200-BK-14
519-PK-18
200-BK-14
200-BK-18
7G-1060
GROUND STRAP
CHASSIS PLATFORM
PLATFORM
C578-YL
135-BU
147-PU-18
L11
L13
L9
L12
L16
L6
L19
L18
L13
L12
L11
118-GY
524-BU
954-GN-18
310-PU-18
145-9321
RADIO SW
ATCH RADIO
135-BU
C578-YL
135-BU
C578-YL
135-BU
C537-GN-18
954-GN-18
L970-GY-18
111-4784
ATCH START AID SW
AIR HEATER/
200-BK-18
310-PU-18
K909-BU-18
590-GY-18
G
308-YL-18
F771-OR-18
G
147-PU-18
A537-PK-18
615-YL-18
615-YL-18
200-BK-18
111-6458
SEAT HEATER
SEAT WITH
ATCH
311-WH-18
310-PU-18
1
2200-BK-18
A537-PK-18A537-PK-18
F772-WH-18
147-PU-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
501-GN-18
A586-OR-18
615-YL-18
191-WH-18191-WH-18
C578-YL
113-OR-18
105-RD-14
185-YL-18
786-GN-18
791-PK-18
308-YL-18
307-OR-18
K906-GN-18
A768-BU-18
A769-GY-18
A770-PK-18
F774-WH-18
F773-OR-18
147-PU-18
954-GN-18
135-BU
129-BU-18
K912-GN-18
K911-PK-18
235-BK-14
K905-RD-14
200-BK-18
K997-BU-18
200-BK-14
200-BK-14
A586-OR-18
501-GN-18
590-GY-18
524-BU
118-GY
120-YL
K905-RD-14
C538-OR-18
103-RD-18
118-GY
103-RD-18
524-BU
615-YL
615-YL-18
506-PU-18
403-GN-18
615-YL-18
200-BK-18
615-YL-18
615-YL-18
135-BU
C578-YL
G
200-BK-18
H414-YL-18
L970-GY-18
524-BU
524-BU
120-YL
8630-BU-18
638-WH
152-BU-18
G
191-WH-18
H414-YL-18
615-YL-18
615-YL-18
200-BK-18
191-WH-18
132-1828
WARNING SW
ATCH OVERLOAD
G
G
OPERATOR STATION
CONN 12CONN 13CONN 14CONN 15
200-BK-18
152-BU-18
191-WH-18
200-BK-18
615-YL-18
310-PU-18
311-WH-18
G
111-4783
HEATER SW
ATCH SEAT
200-BK-18
8630-BU-18
C578-YL
310-PU-18
8630-BU-18
152-BU-18
8630-BU-18
152-BU-18H415-BR-18
ATCH AUX SW
191-WH-18191-WH-18
113-4683
WARNING BUZZER
ATCH OVERLOAD
G
H415-BR-18
H414-YL-18
G
200-BK-18
615-YL-18
615-YL-18
152-BU-18
G
200-BK-18
147-PU-18
A537-PK-18
A537-PK-18
H414-YL-18
H414-YL-18
H415-BR-18
791-PK-18
200-BK-18
200-BK-14
H415-BR-18
L14
L27
L27
C599-OR-18
L26
200-BK-18
235-BK-14
955-BU-18
955-BU-18
L27
L972-BU-18L972-BU-18
955-BU-18 955-BU-18
955-BU-18
C538-OR-18
C537-GN-18
C588-BR-18
191-WH-18
A
B
C
GA
C599-OR-18
C588-BR-18
191-WH-18
C599-OR-18C599-OR-18
C588-BR-18C588-BR-18
191-WH-18 191-WH-18
G
152-BU-18
8630-BU-18
615-YL-18
615-YL-18
200-BK-18
BEACON SW
ATCH ROTATING
200-BK-18
191-WH-18
118-GY
615-YL-18
113-OR-18
791-PK-18
K909-BU-18
200-BK-18
K909-BU-18
110-7884
GOV SW
BACKUP
G
G
200-BK-18
200-BK-18
200-BK-18
114-0421
EPR VALVE SW
BACKUP
200-BK-18
200-BK-18
1
2
3
185-YL-18
1
3
4
6
7
185-YL-18
9
K907-BU-18
10
12
2
K906-GN-18
786-GN-18
A770-PK-18
5
F772-WH-18
8
11
F774-WH-18
L969-WH-18
F773-OR-18
F771-OR-18
200-BK-18
L968-OR-18
185-YL-18
185-YL-18
K906-GN-18
A768-BU-18
A769-GY-18
A768-BU-18
A769-GY-18
L968-OR-18
A770-PK-18
L969-WH-18
K907-BU-18
K909-BU-18
200-BK-18
185-YL-18
K906-GN-18
A768-BU-18
A769-GY-18
G
200-BK-18
L968-OR-18
L969-WH-18
A770-PK-18
K907-BU-18
K909-BU-18
F772-WH-18
F774-WH-18
F773-OR-18
F771-OR-18
615-YL-18
200-BK-18
200-BK-18
308-YL-18
308-YL-18
307-OR-18
615-YL-18
105-RD-14
A758-BR-18
A757-GY-18
A756-BU-18
A755-PK-18
590-GY-18
501-GN-18
A586-OR-18
786-GN-18
791-PK-18
113-OR-18
308-YL-18
307-OR-18
K906-GN-18
F773-OR-18
F774-WH-18
A770-PK-18
A769-GY-18
A768-BU-18
615-YL-18
185-YL-18
105-RD-14
113-OR-18
200-BK-18
H415-BR-18
786-GN-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
F772-WH-18
F771-OR-18
308-YL-18
A586-OR-18
501-GN-18
590-GY-18
A586-OR-18
501-GN-18
590-GY-18
105-RD-14
307-OR-18
308-YL-18
308-YL-18
A758-BR-18
A757-GY-18
A756-BU-18
A755-PK-18
A
PLATFORM
235-BK-14
G
A G
3
7
2
3
5
6
4
7
1
8
6
5
4
1
2
3
4
5
6
7
2
8
9
1
11
10
9
12
11
8
10
12
G
G
200-BK-14
200-BK-14
200-BK-18
2
3
4
5
6
1
8
7
A
A
K909-BU-18
200-BK-18
113-OR-18
147-PU-18
105-RD-14
185-YL-18
103-RD-18
118-GY
103-RD-18
129-BU-18
K905-RD-14
9W-0335
LIGHTER
CIGAR
D D
D D
6T-7337
METER
SERVICE
-
113-3431 (NOTE E)
SENSOR
A/C PHOTO
PROVISION FOR
106-0172
MONITOR
9G-2795 (NOTE E)
WINDSHIELD SW
D
D
127-9838
WIPER CONT
L3
L4
L5
L6
500-BR-18
524-BU
200-BK
200-BK-18
2
5
T
8
1
RS485+
MAIN
+B
RS485-
LIGHT
GND
+
D
D
CAB
D
L4
7
500-BR-18
3
9
6
4
WIND SW
INTER SW
OUTPUTS
WIPER SW
MOT WASH
+ 24 IN
WASH SW
GND IN
506-PU
200-BK
200-BK-14
K997-BU-18
200-BK-18
201-BK-18
200-BK-18
200-BK-14
C537-GN-18
C538-OR-18
129-BU-18
403-GN-18
200-BK-18
590-GY-18
K911-PK-18
200-BK-18
103-RD-18
201-BK-18
K912-GN-18
501-GN-18
A586-OR-18
615-YL-18
118-GY
200-BK-18
Y/W
Y/G
L972-BU-18
BR
WH
BLADE FLOATING SW
G
G
TA
CONN 29
CONN 34
CONN 33
CONN 30
CONN 32
SW 144-3614
OVERLOAD WARNING PRESSURE
200-BK
H415-BR
200-BK
H415-BR
1
3
2
PRESS. SW
1
2
191-WH-18
191-WH-18
G
G
G
G
G
PRESS. RAISE SW
LOW IDLE AND
BLADE SW
HAMMER SW
G
YL
GN
BU
RD
GY
BK
122-4828
MULTISWITCH JOYSTICK-RH
2
1H415-BR-18
200-BK-18
955-BU-18
L27
145-6619
WITH 4 SWITCH
MULTISWITCH JOYSTICK-RH
C588-BR-18
191-WH-18
C599-OR-18
U
U
BLUE
GREEN
BU
GN
RD
WH
OR
YL
PK
BK
BROWN
PURPLE
GRAY
BLACK
COLORABBREV
PINK
YELLOW
ORANGE
WHITE
RED
BR
PU
GY
106-0107
POS SW
THROTTLE
G
COM
S1
S2
S3
S4
200-BK-18
BK
BR
308-YL-18
GN
BU
PKA755-PK-18
590-GY-18
ST
ON
OFF
B
S
6
C
R
9G-7641
KEY SW
111-4800
SWITCH PANEL
311-WH-18
501-GN-18
308-YL-18
A586-OR-18
307-OR-18
786-GN-18
105-RD-14
791-PK-18
113-OR-18
A756-BU-18
A757-GY-18
A758-BR-18
200-BK-18
G
G
W INT
W LOW
WASH
L BOOM
L CHASSIS
+B
GND
OPERATOR STATION
1
2
3
4
5
200-BK-14
L1
E
D
L9
200-BK
638-WH
200-BK-18
D
103-RD-18
200-BK-18
L9
200-BK
A
L10
A
235-BK-18
L909-BU-18
L908-OR-18
K997-BU-18
K997-BU-18
A771-PU-18
L978-GY-18
L974-GN-18
L977-YL-18
403-GN-18
788-YL-18
A762-PU-18
763-BU-18
12
7
8
9
10
1
11
6
5
4
3
2
412-BU-18
C468-BU-18
321-BR-18
2
3
4
5
6
1
8
7
405-GY-18
492-GY-18
491-PK-18
495-GN-18
K997-BU-18
430-BU-18
496-WH-18
K904-GN-18
A761-PU-18
487-OR-18
L971-GN-18
L970-GY-18
K997-BU-18
954-GN-18
877-YL-18
235-BK-14
K905-RD-14
1
6
5
4
3
2
AA
A A
AA
JOYSTICK +B OUT
34
11
14
33
32
OPTION SENSOR (PWM)
5
19
16
1
D
OPTION SENSOR (PWM)
3
4
37
A
AIH INDICATOR
RS232C (TX)
HAMMER PRESS. SW
GND
GND
37
38
39
30
31
29
35
36
5
15
16
13
14
23
24
3
34
22
11
1
20
21
LOW IDLE SW
27
28
4
2
40
12
26
RS485 - (ELEC GOV)
KEY SW ON
25
33
32
AUX HYD PRESS. SW
DUAL PWR SOL
LEVEL FINISH SOL
BOOM RAISE PRESS. SW
K997-BU-18
FINE SWING SW
AIH INDICATOR
+B
+B
19 RS485 + (ELEC GOV)
RS485 - (RADIO CONT)18
HYD OIL FILTER INDICATOR
TRAVEL PRESS. SW 18
27
RS485 - (MONITOR)
RS485 + (RH JOYSTICK)
HYD TANK INDICATOR
RS485 - (SEMI AUTO)
RS485 + (MONITOR)
HYD TANK PRESS. SW
17 RS485 + (RADIO CONT)
RS485 - (PEDAL)
RS485 + (SEMI AUTO)
10
403-GN-18
9 RS485 + (PEDAL)
RS485 - (LH JOYSTICK)
A771-PU-18
L978-GY-18
L974-GN-18
8
L977-YL-18
7 RS485 + (LH JOYSTICK)
8
21
17
EPR VALVE (-)
23
788-YL-18
A762-PU-18
763-BU-18
412-BU-18
C468-BU-18
SWING BRAKE SOL
36
ENG OIL PRESS. SW
TRAVEL ALARM
12
38
7
RS485 - (RH JOYSTICK)
ALTERNATOR (W TERM)
15
22
25
24
6
39
6
2
40
35
29
30
13
26
31
28
10
20
9
COOLANT SENSOR
RS232C (RX)
RS232C (GND)
RS485 + (VALVE CONT)
RS485 - (VALVE CONT)
HYD OIL TEMP SENSOR
L969-WH-18
AIR CLEANER SENSOR
HYD OIL LEVEL SW
FRONT PUMP PRESS. SENSOR
321-BR-18
405-GY-18
FUEL LEVEL SENSOR
ENG OIL LEVEL SW
IMPLEMENT PRESS. SW
TRENCHING SOL
ENG SPEED SENSOR (+)
ENG SPEED SENSOR (-)
TRAVEL SPEED SOL
COOLANT LEVEL SW
GOV ACTR FDBK
GOV ACTR (B)
EPR VALVE (+)
GOV ACTR (A)
THROTTLE DIAL S4
THROTTLE DIAL S3
THROTTLE DIAL S2
THROTTLE DIAL S1
MONITOR +B OUT
492-GY-18
491-PK-18
L968-OR-18
K907-BU-18
495-GN-18
F772-WH-18
430-BU-18
496-WH-18
K904-GN-18
F771-OR-18
200-BK-18
A761-PU-18
L970-GY-18
L971-GN-18
L969-WH-18
L968-OR-18
K907-BU-18
F772-WH-18
F771-OR-18
K905-RD-14
235-BK-14
K905-RD-18
235-BK-18
308-YL-18
K905-RD-18
235-BK-18
A755-PK-18
A756-BU-18
K911-PK-18
K912-GN-18
877-YL-18
200-BK-18
A757-GY-18
A758-BR-18
L972-BU-18
954-GN-18
487-OR-18
L908-OR-18
L909-BU-18
235-BK-18
K911-PK-18
K912-GN-18
A755-PK-18
A756-BU-18
A757-GY-18
A758-BR-18
308-YL-18
L972-BU-18
E
E
E
E
E
E
E
E
L3
L4
MM
ROTATING BEACON
ATCH
L26
6C-3431
ANTENNA
AA
A
CONN 16 CONN 17 CONN 18 CONN 19
CONN 23CONN 22CONN 21CONN 20
200-BK-18
2
1
8
3
4
5
6
7
7Y-5505
ATCH SPEAKER(R)
7Y-5505
ATCH SPEAKER(L)
7
8
1
6
5
4
3
2
096-0721
DOME LAMP
CAB
118-GY
135-BU
103-RD-18
C578-YL
120-YL
506-PU
TO LUNCH BOX
200-BK-18
103-RD-18
615-YL
118-GY
524-BU
9R-7941
12V SOCKET
210-BK
135-BU
2
524-BU
1
2
A
1
200-BK
638-WH
524-BU
200-BK
615-YL
615-YL
1
2
12
4
5
2
1
10
MM
6
3
11
7
8
9
200-BK-14
200-BK
K997-BU-18
C538-OR-18
C537-GN-18
A586-OR-18
615-YL-18
103-RD-18
K912-GN-18
K911-PK-18
403-GN-18
129-BU-18
501-GN-18
590-GY-18
A
B
C
OPERATOR STATION
200-BK-14
118-GY
12V 7A
1310327
CONVERTER
103-RD-18
633-BU-18
139-OR-18
210-BK
135-BU
120-YL
GND
+24V SW IN
+12V MEM OUT
LIGHT OUT (DC12V)
+24V BAT IN MEM
200-BK
1
2
3
5
6
7
8
GND
12V SW OUT
615-YL-18
4
LIGHT IN (DC24V)
AM/FM RADIO
ATCH
1
6
2
5
3
4
8
7
139-OR-18
509-WH-18
511-BR-18
512-GN-18
B + 12V
C578-YL
508-PU-18
210-BK
633-BU-18
511-BR-18
512-GN-18
508-PU-18
509-WH-18
MEMORY +12V
GROUND
+12V LIGHT
SPEAKER RH+
SPEAKER RH-
SPEAKER LH+
SPEAKER LH-
L27
L10
615-YL-18
132-7834
ENG/PUMP CONT
EE 132-1806 A-9
RANT CHARGE.NOTE A: NORMALLY OPEN BEFORE REFRIGE
DD 134-3344 G-9
STRAP AS.
NOTE E: USE WITH A/C UNIT.
YY 111-4831 G-7
NOTE F: USE WITH ETHER STARTING.
UU 128-8937 H-9
SS 152-1224 H-7
PP 132-1827 A-2
N 146-7251 B-2
FF 7G-1060 G-6
N N
L1
L1
L4
L3
L3
L4
7T-0970
HORN
1
2
C 325-PK-18325-PK-18
325-PK-18
2
1
1
2
2
1
325-PK-18325-PK-18
325-PK-18
PPB
5I-8250
BOOM LAMP
ATCH
5I-8251
LAMP
CHASSIS
616-BU
322-GY-18
L976-GN-18
365-YL-18
200-BK-18
L976-GN-18
L976-GN-18
365-YL-18
9X-4184
STOP SW(NC)
REFUELING
ATCH
R R
365-YL-18
325-PK-18
L976-GN-18
365-YL-18
200-BK
168-RD-14
168-RD-14
168-RD-18
168-RD-14
168-RD-14
200-BK-14
111-4871
RELAY 1
REFUELING
ATCH
111-4871
RELAY 2
REFUELING
ATCH
200-BK-14
2
1
616-BU
-
+
323-WH-14
200-BK-18
K
J
K
J
7T-0969
HORN
N
N
R
6T-9442
START SW(NO)
REFUELING
ATCH
123-3928
PUMP
REFUELING
ATCH
CHASSIS
5I-8250
BOOM LAMP
ATCH
B
B
B
B
L976-GN-18
200-BK-14
168-RD-18
S
200-BK
N
322-GY-18
200-BK-18
200-BK
322-GY-18
200-BK-18
200-BK-14
200-BK-18
616-BU
200-BK-18
607-PK-18
200-BK
200-BK-18
SS
B N
B
A168-RD-14
607-PK-18
200-BK-18
200-BK-18
607-PK-18
168-RD-14
200-BK-14
200-BK
168-RD-14
607-PK-18
322-GY-18
616-BU
495-GN-18
325-PK-18
CONN 31
B
1
2
5C-6108
REFUELING SW
ATCH
105-9911
SENSOR
FUEL
PP
K906-GN-18
200-BK-18
200-BK-18
1
2
B
121-1491
SOL
SWING BRAKE
495-GN-18
K906-GN-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
168-RD-14
607-PK-18
322-GY-18
616-BU
YL
BK
T 144-3080 C-3
A 146-7245 G-3
S 116-0098 B-3
R 116-0096 B-2
WW 111-4829 G-7
M 148-5561 H-3
NOTE B; USE WITH COLD WEATHER.
HARNESS AS.
LOCPART NO.IDENT
C 147-0059 G-8
D 130-6568 B-5
E 144-9617 B-6
G 146-7247 E-4
H 146-7248 H-4
J 121-1010 C-2
K 7Y-3994 C-2
L 137-1840 G-1
WIRE AS.
XX 111-4830 G-7
CABLE AS.
AA 140-0905 F-9
BB 116-0080 F-9
CC 132-1804 G-9
XCAVATOR.THIS SCHEMATIC IS FOR THE 312B-HYD E
(136-4042 CHG 02)
GINE OFF.OPERABLE MACHINE WITH THE KEY AND EN
FULLYCOMPONENTS ARE SHOWN INSTALLED ON A
IS 16 GAUGE.UNLESS OTHERWISE SPECIFIED ALL WIRE
ZZ 152-1223 G-7
VV 128-8936 H-9
B 146-7246 A-2
200-BK-18
200-BK
200-BK
C576-BU-18
C577-GY-18
200-BK
INDSHIELD.NOTE C: USE WITH ELECTRIC OPENABLE W
SOL. HP OPEN 116-3413
QUICK COUPLER
B
2
1
200-BK-18
780-PU-18
779-WH-18
780-PU-18
WINDSHIELD.
PENABLENOTE D: NOT NECESSARY FOR ELECTRIC O
C576-BU-18
200-BK-18
1
2
B
VALVE
ATCH MEDIUM PRES.
B
2
1
200-BK-18
C577-GY-18
779-WH-18
200-BK-18
1
2
B
SOL. HP CLOSE
QUICK COUPLER
200-BK-18
200-BK-18
U 144-7629 C-3
L1
L1
18-BK 200-BK-18
18-WH
18-BK
2
CHASSIS
2
1
2
1
132-1806
GROUND STRAP
ENG
2
1
1
2
2
1
334-BU-14
327-PK
200-BK
FUEL PUMP
RD-00
878-OR-18
B
8N-1693
TEMP SW
ATCH COOLANT
T
G
B
S
200-BK-18
200-BK-18
MTRBAT
MOTOR
101-RD-4
304-WH-8
788-YL-18
A762-PU-18
172-RD-18
200-BK-18
327-PK
788-YL-18
A762-PU-18
405-GY-18
519-PK-18
RD-00
878-OR-18
B
1
2
EE
EE
200-BK-6
200-BK-18
200-BK-18
1
B
18-RD
107-0611
PRESS. SW
ENG OIL
405-GY-18
126-5983
COOLANT TEMP SW
SOL
COLD ADVANCE
B
B
B
399-OR-18
200-BK-18
376-GN-18
376-GN-18
399-OR-18
376-GN-18
T
C576-BU-18
C577-GY-18
C589-GY-18
334-BU-14
200-BK-18
C591-PK-18
200-BK-18
B
200-BK-18
C589-GY-18
C589-GY-18
C589-GY-18
C591-PK-18
200-BK-18
143-2390
BLADE SOL.
780-PU-18
779-WH-18
6
1
2
1
2
3
4
5
B
B
495-GN-18
168-RD-14
K906-GN-18
106-0179
PRESS. SW
TRAVEL
200-BK-18
616-BU
322-GY-18
607-PK-18
487-OR-18
200-BK-18 B
T
C
496-WH-18
111-4760
LEVEL SW
HYD OIL
4I-5394
TEMP SENDER
HYD OIL
491-PK-18
106-0179
PRESS. SW
IMPLEMENT
L971-GN-18
B
200-BK-18
200-BK-18
200-BK-18
116-3660
INDICATOR
FILTER
HYD OIL
B
168-RD-18 A +B
1
2
B
B
106-0180
PRESS. SW
BOOM RAISE
GROUND
SIGNAL
B
B
A771-PU-18
200-BK-18
200-BK-18
L974-GN-18
A771-PU-18
L971-GN-18
B
200-BK-18
L977-YL-18
200-BK-18
763-BU-18
200-BK-18
L978-GY-18
A769-GY-18
121-1491
SOL
TRAVEL SPEED
121-1490
SOL
TRENCHING
A768-BU-18
121-1490
SOL
LEVEL FINISH
111-9916
SOL
ENG/PUMP CONT
1
2
B
B
B
B
200-BK-18
200-BK-18
K904-GN-18
3E-1906
CLUTCH SOL
ATCH A/C COMPR
A
200-BK-18
K904-GN-18
AA
1
2
B
200-BK-18
B
K997-BU-18
ALT
D
P
B+
B-
W
109-2361
STARTER
200-BK-18
200-BK-6
492-GY-18
112-4009
SENDER
COOLANT TEMP
T
F774-WH-18
200-BK-18
F773-OR-18
200-BK-18
A761-PU-18
200-BK-18
B
200-BK
172-RD-18
200-BK-18
2
109-RD-6
1
1
2
111-4760
LEVEL SW
ENG OIL
109-2362
ALTERNATOR
KEY
B
139-3917
ACTUATOR
ENG GOV
B B
6
DECEL
YL-18
K779-PU-18
B
513-OR-18
200-BK-18
109-RD-6
403-GN-18
C468-BU-18
ACCEL
+B
F/B
GND
B
CHASSIS
C
B
BR-18
BK-18
+B
GROUND
SIGNAL
106-0178
PRESS. SENSOR
PUMP DISCHARGE
B
B
B
200-BK-18
K997-BU-18
327-PK
A762-PU-18
788-YL-18
6V-2455
PICKUP
ENG SPEED
B
1
2
035-8059
AIR HEATER
C468-BU-18
101-RD-4
304-WH-8
405-GY-18
K779-PU-18
492-GY-18
403-GN-18
519-PK-18
763-BU-18
L977-YL-18
L978-GY-18
A769-GY-18
A768-BU-18
496-WH-18
491-PK-18
168-RD-18
487-OR-18
K997-BU-18
K904-GN-18
F774-WH-18
F773-OR-18
A761-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
L974-GN-18
5
3
4
B
519-PK-18
113-3444 (NOTE A)
LOW PRESS. SW
ATCH REFRIGERANT
513-OR-18
OR
PK
N 146-7251 B-2
T 144-3080 C-3
A 146-7245 G-3
S 116-0098 B-3
R 116-0096 B-2
M 148-5561 H-3
C 147-0059 G-8
D 130-6568 B-5
E 144-9617 B-6
G 146-7247 E-4
H 146-7248 H-4
J 121-1010 C-2
K 7Y-3994 C-2
L 137-1840 G-1
B 146-7246 A-2
U 144-7629 C-3
A
B
C
123
D
E
F
I
G
H
123
456
456
789
A
B
C
D
E
F
H
I
G
789
STARTING CIRCUIT.
GAUGE CIRCUIT.
MONITOR CIRCUIT.
TURN SIGNAL AND
WASHER/WIPER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
ENGINE / PUMP CONTROL CIRCUIT.
START AID / AIR HEATER CIRCUIT.
ALL DASHED LINES ARE ATTACHMENTS.
WIRES THAT HAVE VOLTAGE WHEN
THE KEY SWITCH IS OFF.
WIRES THAT HAVE VOLTAGE WHEN
THE KEY SWITCH IS ON.
SYMBOL DESCRIPTION
BLADE, SPADE, RING OR SCREW
TERMINAL
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ELECTRICAL CONNECTION TO
MACHINE STRUCTURE
INTERNAL ELECTRICAL CONNECTION
TO SURFACE OF COMPONENT
CONNECTOR
ATCH WIRE, CABLE, COMPONENT
CIRCUIT CONNECTED
SPLICE
CIRCUIT GROUPING DESIGNATION
H#
N 146-7251 B-2
T 144-3080 C-3
A 146-7245 G-3
S 116-0098 B-3
R 116-0096 B-2
M 148-5561 H-3
C 147-0059 G-8
D 130-6568 B-5
E 144-9617 B-6
G 146-7247 E-4
H 146-7248 H-4
J 121-1010 C-2
K 7Y-3994 C-2
L 137-1840 G-1
B 146-7246 A-2
U 144-7629 C-3
