973C TRACK-TYPE LOADER ELECTRICAL SYSTEM SCHEMATIC

©
2000 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR3994
May 2000
973C Track-Type Loader
Electrical System
3RZ1-UP
Connector Location
Connector Number
Schematic
Location
Machine
Location
CONN 1 C-8 1
CONN 2 C-7 19
CONN 3 C-7 19
CONN 4 C-7 19
CONN 5 C-7 19
CONN 6 C-7 19
CONN 7 B-6 E
CONN 8 B-6 21
CONN 9 C-5 16
CONN 10 B-5 9
CONN 11 A-5 E
CONN 12 A-5 E
CONN 13 B-4 8
CONN 14 D-4 27
CONN 15 D-3 31
CONN 16 C-2 A
CONN 17 C-1 30
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
Title Form Number
Alternator: (107-7977) SENR4757
Caterpillar Monitoring System RENR2014
Electronic Hydrostatic Control SENR8314
Starter Motor: (104-7040)
Consist: 6V-5720 SENR3581
Consist: 106-8557 SENR3859
CID Component
Caterpillar Monitoring System (MID No. 30)
0096 Fuel Level Sender
0110 Engine Coolant Temperature Sensor
0177 Torque Converter Oil Temperature Sensor
0248 Data Link
0263 8 Volt Sensor Power Supply
0271 Action Alarm
0324 Action Lamp
0600 Hydraulic Oil Temperature Sensor
0601 Brake Air Pressure
0819 Display Data Link
0821 9 Volt Display Power Supply
0830 Brake Oil Temperature
Electronic Hydrostatic Control (MID No. 79)
0070 Parking Brake Switch
0110 Engine Coolant Temperature Sensor
0168 Electrical System Voltage
0190 Engine RPM Sensor
0269 Sensor Supply Voltage
0296 Hydrostatic Transmission Electronic Control Module
0299 Transmission Lever Position Sensor
0349 Transmission Sync Solenoid
0358 Pilot Pressure Supply Actuator
0463 Implement Dual Pressure Relief Solenoid
0464 Implement Tilt Lever Position Switch
0465 Governor Control Lever Switch
0466 Left Track Steering Pedal Position Sensor
0467 Right Track Steering Pedal Position Sensor
0468 Service Brake Pedal Position Switch
0469 Left Track Forward Direction Solenoid
0470 Left Track Reverse Direction Solenoid
0471 Right Track Forward Direction Solenoid
0472 Right Track Reverse Direction Solenoid
0473 Charge Pressure Sensor
0589 Travel Speed Switch
0617 Air Inlet Heater Relay
0650 Harness Code
0681 Parking Brake Solenoid
Component identifiers (CID¹) and Module Identifier (MID²)
The CID is a diagnostic code that indicates which component is faulty. The MID is
a diagnostic code that indicates which electronic control module diagnosed the
fault.
Monitoring System Mode
Mode of Operation Mode Number
Normal 0
Harness Code 1
Parameter Display 2
Service 3
Digital Tattletale 4
Electronic Hydrostatic Control 5
Sales Model Machine Code
973C 012
Machine Code
Failure Mode Identifiers (FMI)¹
FMI No. Failure Description
0 Data valid but above normal operational range.
1 Data valid but below normal operational range.
2 Data erratic, intermittent, or incorrect.
3 Voltage above normal or shorted high.
4 Voltage below normal or shorted low.
5 Current below normal or open circuit.
6 Current above normal or grounded circuit.
7 Mechanical system not responding properly.
8 Abnormal frequency, pulse width, or period.
9 Abnormal update.
10 Abnormal rate of change.
11 Failure mode not identifiable.
12 Bad device or component.
13 Out of calibration.
14 Parameter failures.
15 Parameter failures.
16 Parameter not available.
17 Module not responding.
18 Sensor supply fault.
19 Condition not met.
20 Parameter failures.
¹The FMI is a diagnostic code that indicates what type of failure has occurred.
Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Machine
Alarm - Action D-4 A Sensor - Bucket Positioner C-1 27
Alarm - Backup C-8 1 Sensor - Center Pedal B-2 15
Alternator D-8 2 Sensor - Charge Pressure C-5 16
Battery A-8 32 Sensor - Coolant Temp C-8 2
Battery D-8 3 Sensor - Hydraulic Oil Temp C-1 17
Breaker - Alt A-6 E Sensor - Left Steering Pedal B-2 15
Caterpillar Monitoring System A-2 A Sensor - Lift Kickout C-1 28
Control - Electronic Hydrostatic A-5 E Sensor - Powertrain Oil Temp C-7 36
Control - Pilot Valve A-4 B Sensor - Right Steering Pedal B-2 15
Converter B-4 D Sensor - RPM A-6 18
Diode - Arc Suppressor B-8 4 Sensor - RPM C-6 18
Fuses A-7 E Sensor - Speed/Direction D-3 19
Gauge Cluster D-2 A Solenoid - A/C Clutch B-8 4
Ground - Cab Roof C-4 D Solenoid - Engine Shutdown B-8 20
Ground - Dash C-2 A Solenoid - Left Forward C-5 16
Ground - Engine D-7 5 Solenoid - Left Rev C-5 16
Ground - Engine D-8 2 Solenoid - Override C-5 16
Ground - Engine D-8 2 Solenoid - Park Brake C-5 16
Ground - Front Frame D-2 6 Solenoid - Right Forward C-5 16
Ground - Left Frame C-7 3 Solenoid - Right Rev C-5 16
Ground - Left Frame A-8 3 Solenoid - Start Aid D-7 21
Ground - Platform D-2 6 Solenoid - Sync C-5 22
Ground - Rear Frame D-7 3 Switch - A/C High/Low B-8 4
Horn - Forward D-1 6 Switch - Air Inlet Heater C-2 A
Lamp - Action B-2 A Switch - Blower B-4 B
Lighter - Cigar B-2 A Switch - Clear A-4 23
Motor - Blower B-5 8 Switch - Disconnect A-8 21
Motor - Condenser B-5 9 Switch - Engine Oil B-7 24
Motor - Front Washer D-4 10 Switch - Forward Horn C-3 C
Motor - Front Wiper D-4 11 Switch - Front Wiper C-4 25
Motor - Rear Washer D-4 10 Switch - Governor Lever C-3 C
Motor - Rear Wiper D-4 12 Switch - Key Start B-2 A
Motor - Starter D-7 5 Switch - Lamp C-2 A
Radio B-4 D Switch - Operator C-2 A
Relay - Main A-7 E Switch - Rear Wiper C-4 25
Relay - Start A-6 E Switch - Sensor/Speed Cal A-4 23
Relay Assembly B-5 9 Switch - Service A-4 23
Resistor - Blower Motor B-5 8 Switch - Start Aid Temp C-8 2
Resistor - Dimming D-2 A Switch - Thermostat B-5 8
Sender - Engine Speed B-7 5 Switch - Trans Control Brake D-3 C
Sender - Fuel Level D-1 13 Switch - Travel C-3 A
Sender - Trans Oil Temp B-7 14
Machine locations are repeated for components that are located close together.
A = Components located on Dash.
B = Components located on Right Console.
C = Components located on Left Console.
D = Components located in Headliner.
E = Components located on Relay/Fuse Panel.
Resistor, Sender, and Solenoid Specifications
Part No. Component Resistance (Ohms)¹
3E-6332 Solenoid - Start Aid 6
4W-9972 Sender - XMSN Oil Temperature 560 to 716 @ 54ºC (130ºF)
72 to 82 @ 110ºC (230ºF)
6V-2455 Sensor - Engine Speed 110 - 200
9G-1950 Resistor - A/C Motor Overall 2.0 ± .1; Tap 1.0 ± .05
101-1759 Solenoid - A/C Clutch 14.4 ± 0.6
116-4152 Solenoid - Park Brake 34.3 ± 1.7
116-6203 Resistor - Dimming 20 ± 1
Solenoids - Left Forward
Left Reverse
130-3310 Right Forward 7.75 ± 1.00
Right Reverse
Override
130-6913 Solenoid - Sync 33.6
155-4652 Solenoid - Engine Shutdown Latch - 1.55 ± 10%
Unlatch - 10.3 ± 10%
¹ At room temperature.
Off Machine Switch Specification
Part No. Function Actuate Deactuate Contact Position
3E-6449 Start Aid Temperature 38.0 ± 3.0 ºC 27.0 º C Normally
100.4 ± 5.4ºF 80.6 ºF Closed
3E-7692 Engine Oil 113.0kPa MAX 70.0 ± 20.0kPa Normally
16.4psi MAX 10.2 ± 2.9psi Open
114-5333 Refrigerant Pressure (AC) 275 to 1750 kPa¹ -- Normally ²
40 to 255 psi -- Open
² Contact position at the contacts of the harness connector.
¹ A hysteresis band exists: with increasing pressure the closed condition can be maintained up to 2800 kpa (405 psi), with decreasing pressure the
closed condition can be maintained down to 170 kpa (25 psi).
Wire Description Chart
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
Power Distribution Circuits Accessory Circuits (cont'd)
101 RD Bat (+) 506 PU Washer - Front
102 BU Hd Lmp 507 WH Washer - Rear
105 BR Key Sw 508 PU Radio Speaker - Left
109 OR Alt Output (+) Term. 509 WH Radio Speaker - Left (Commom)
112 PU Main Power Rly Output 511 BR Radio Speaker - Right
113 OR Opr Mon Panel B (+) Switched 512 GN Radio Speaker - Right (Common)
114 GN Warning Horn (Forward) 513 OR A/C Compressor/Refrigerant Press SW
116 BR Aux Ckt 515 GY Blower Motor (HI)
118 GY Wiper/Radio 516 GN Blower Motor (Medium)
124 GN A/C 517 BU Blower Motor (Low)
128 PK Kickout 521 YL A/C SW To Refrigerant SW
129 BU Cigar Lighter 522 WH A/C Clutch To Thermostat SW
158 BR Air Condition 592 BU DC/DC Converter Power Output
160 PU Aux Ckt A513 PK DC/DC Converter Memory Output
164 WH Hydro Ctrl Lighting Circuits
Ground Circuit 600 BR Dash Lamp Basic
200 BK Main Chassis 610 OR Head Lamp Basic
201 BK Operator Monitor Return 615 YL Cab Flood Lamp/Rops
202 BK XMSN Ctrl 663 GY Gauge Lamps - CAT Mon Sys
260 BK TEHC Ident Code 0 Control Circuits
261 BK TEHC Ident Code 1 761 GY Lift Kickout Sol SW
262 BK TEHC Ident Code 2 762 YL Bucket Positioner Sol SW
263 BK TEHC Ident Code 3 799 WH Sensor Power
270 BK CAT Mon Sys Ident Code 0 C744 PU Parking Brake - Sol To SW
271 BK CAT Mon Sys Ident Code 1 E707 GN Display +V
272 BK CAT Mon Sys Ident Code 2 E708 PK Display Clock
273 BK CAT Mon Sys Ident Code 3 E735 PU CAT Mon Sys Tack/Serv Mtr/Odom Sel
274 BK CAT Mon Sys Ident Code 4 F743 GY Impl Lift Prop Sol 2
275 BK CAT Mon Sys Ident Code 5 F780 PK Parking Brake SW
290 BK CAT Mon Sys Service F793 OR Air Inlet Heater Relay
291 BK CAT Mon Sys Clear F794 BU Lift SW (N.C.)
Basic Machine Circuits F795 YL Lift SW (N.O.)
301 BU Starter No. 1 Sol F796 GY Engine Speed
304 WH Starter Relay No. 1 Output 822 PK Forward Hydrst Sync Sol
306 GN Starter Relay Coil 828 WH Hydrst Left Ster Pedal Sensor
308 YL Main Power Relay Coil 829 GN Hydrst Pedal Sensor
310 PU Start Aid SW To Start Aid Sol 830 OR Hydrst Right Ster Pedal Sensor
311 WH Start Aid Sol To Temp SW 831 PK Hydrst Eng Speed Sensor
321 BR Bckp Alarm 836 WH Hydrst Throttle N/O SW
322 GY Warning Horn (Forward) 837 GN Hydrst Throttle N/C SW
326 PU Key SW "C" Term. 843 WH Hydrst Left Pump Forward Sol
Monitoring Circuits 844 GN Hydrst Left Pump Reverse Sol
403 GN Alternator (R) Term. 848 GY Hydrst Speed Reverse Sol
405 GY Opr Mon Oil Press. (Low Setting) 849 YL Hydrst Right Pump Reverse Sol
410 WH Opr Mon Action Alarm 850 PU Hydrst Right Pump Forward Sol
411 PK Opr Mon Master 851 WH Hydrst Speed And Direction Sensor
419 YL Opr Mon Parking Brake 852 GN Hydrst Charge Press. Sensor
441 OR Eng Coolant Temp Gauge 892 BR CAT Data Link (-)
442 GY Hyd System Temp Gauge 893 GN CAT Data Link (+)
443 YL Power Train Temp Gauge F842 BU AIH Post Heat
447 PK Fuel Level Gauge 975 WH Sol Return
C413 YL Display Data E900 WH Trans Output SPD (+)
C414 BU Display Load E901 GN Trans Output SPD (-)
Accessory Circuits E902 PU Trans Intermediate SPD (+)
500 BR Wiper - Front (Park) E903 YL Trans Intermediate SPD (-)
501 GN Wiper - Front (Low) G939 PK Hydro Cont Switch Return
502 OR Wiper - Front (HI) K997 BU (+) V Sensor, CAT Mon Sys
503 BR Wiper - Rear (Park) R985 WH Travel Speed SW Travel Mode
504 YL Wiper - Rear (Low) R986 BU Travel Speed SW Work Mode
505 BU Wiper - Rear (HI)
1
2
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.
325-L25 PK-14
200-L32 BK-14
325-A135 PK-14
AG-C4
111-7898
L-C12
3E-5179
AG-C4
111-7898
L-C12
3E-5179
C-C4
130-6795
*
*
*
*
*
*
*
Harness And Wire Electrical Schematic Symbols
Electrical Schematic Symbols And Definitions
9X-1123
Part Numbers For
Connector Assembly
Component
Part Number
Wire, Cable, or Harness
Assembly Identification
Circuit Number
Identification
Wire
Color
Single Wire
Connector
Wire
Gauge
2
Socket
Pin
Pin or Socket
Number
Plug
Receptacle
1
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.
AG-C3
130-6795
Harness identification letter(s) and a
serializing code. The "C" stands for
connector and the number indicates
which connector in the harness.
Harness identification code
This example indicates wire
32 in harness "L'.
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
Machine Harness Connector And Component Locations
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
21
22
22
23
23
24
24
25
25
26
26
A
A
B
B
C
C
D
D
23
23
18
E
E
27
27
28
28
29
29
30
30
31
31
32
32
36
36
A
B
A
B
C
D
A
B
200-G04 BK-18
128-G01 PK-18
200-G05 BK-18
200-G06 BK-18
128-G02 PK-18
128-G03 PK-18
762-G07 YL-18
761-G08 GY-18
164-F1 WH-18
852-F3 GN-18
G939-F2 PK-18
975-F18 WH-14
975-F5 WH-18
975-F7 WH-18
975-F10 WH-18
975-F16 WH-18
975-F15 WH-18
975-F13 WH-18
975-F9 WH-18
843-F4 WH-18
844-F6 GN-18
848-F8 GY-18
822-F11 PK-18
850-F12 PU-18
849-F14 YL-18
C744-F17 PU-18
443-R10 YL-18
799-R20 WH-18
G939-R17 PK-18
441-R18 OR-18
831-R5 PK-18
F796-R4 GY-18
522-R16 WH-14
326-R6 RD-18
521-R19 YL-14
405-R9 GY-18
522-R15 WH-14
522-R11 WH-14
513-R13 OR-14
513-R12 OR-14
513-R14 OR-14
301-R7 BU-10
200-R24 BK-10
201-R8 BK-18
403-R25 GN-18
310-R23 PU-18
311-R21 WH-18
200-R22 BK-18
200-X1 BK-4
304-R1 WH-8
101-R2 RD-4
109-R3 RD-4
201-C15 BK-18
128-C11 PK-18
128-C11 PK-18
200-C9 BK-18
200-C9 BK-18
762-C13 YL-18
762-C13 YL-18
761-C12 GY-18
761-C12 GY-18
447-C18 PK-18
447-C18 PK-18
E900-C4 WH-18
E900-C4 WH-18
E901-C3 GN-18
E901-C3 GN-18
200-C6 BK-14
975-C7 WH-18
321-C8
BR-18
610-C5 OR-14
201-C10 BK-18
201-C10
BK-18
E903-A73 YL-18
E903-A73 YL-18
E903-A73 YL-18
E903-A73 YL-18
E902-A71 PU-18
E902-A71 PU-18
E902-A71 PU-18
E902-A71 PU-18
E901-A66 GN-18
E901-A66 GN-18
E901-A66 GN-18
E901-A66 GN-18
E900-A69 WH-18
E900-A69 WH-18
E900-A69 WH-18
E900-A69 WH-18
F743-A61 GY-18
F743-A61 GY-18
F743-A61 GY-18
F743-A61 GY-18
321-A74 BR-18
321-A74 BR-18
321-A74 BR-18
321-A74 BR-18
G939-A126 PK-18
G939-A126 PK-18
C744-A68 PU-18
C744-A68 PU-18
C744-A68 PU-18
822-A56 PK-18
822-A56 PK-18
822-A56 PK-18
848-A60 GY-18
848-A60 GY-18
848-A60 GY-18
852-A62 GN-18
852-A62 GN-18
852-A62 GN-18
843-A47 WH-18
843-A47 WH-18
843-A47 WH-18
844-A44 GN-18
844-A44 GN-18
844-A44 GN-18
849-A48 YL-18
849-A48 YL-18 849-A48 YL-18
850-A50 PU-18
850-A50 PU-18
850-A50 PU-18
164-A118 WH-18
164-A118 WH-18
164-A118 WH-18
164-A119 WH-18
164-A119 WH-18
164-A119 WH-18
164-A120 WH-18
164-A120 WH-18
164-A120 WH-18
G939-A121 PK-18
G939-A121 PK-18
G939-A121 PK-18
G939-A122 PK-18G939-A122 PK-18
G939-A122 PK-18
G939-A123 PK-18
G939-A123 PK-18
G939-A123 PK-18
828-A63 WH-18
828-A63 WH-18
828-A63 WH-18
828-A63 WH-18
829-A57 GN-18
829-A57 GN-18
829-A57 GN-18
829-A57 GN-18
830-A58 OR-18
830-A58 OR-18
830-A58 OR-18
830-A58 OR-18
322-A141 GY-18
322-A141 GY-18
G939-A137 PK-18
G939-A137 PK-18
G939-A137 PK-18
G939-A139 PK-18
G939-A139 PK-18
G939-A139 PK-18
G939-A140 PK-18
G939-A140 PK-18
G939-A140 PK-18
164-A138 WH-18
164-A138 WH-18
419-A55 YL-18
419-A55 YL-18
419-A55 YL-18
419-A55 YL-18
F780-A52 PK-18
F780-A52 PK-18
F780-A52 PK-18
F780-A52 PK-18
836-A53 WH-18
836-A53 WH-18
836-A53 WH-18
836-A53 WH-18
837-A51 GN-18
837-A51 GN-18
837-A51 GN-18
837-A51 GN-18
851-A67 WH-18
851-A67 WH-18
851-A67 WH-18
851-A67 WH-18
799-A64 WH-18
799-A64 WH-18
799-A64 WH-18
799-A64 WH-18
441-A59 OR-18
441-A59 OR-18
441-A59 OR-18
441-A59 OR-18
831-A72 PK-18
831-A72 PK-18
831-A72 PK-18831-A72 PK-18
F796-A70 GY-18
F796-A70 GY-18
F796-A70 GY-18
F796-A70 GY-18
F793-A65 OR-18
F793-A65 OR-18
F793-A65 OR-18
F793-A65 OR-18
112-A1 PU-14
112-A2 PU-14
112-A3 PU-14
112-A4 PU-14
112-A5 PU-14
112-A6 PU-14
112-A7 PU-14
101-N1 RD-14
101-N2 RD-14
101-N4 RD-14
101-N3 RD-12
109-P1 RD-4
101-A20 RD-4
101-A20 RD-4
101-A20 RD-4
109-A21 RD-4
109-A21 RD-4
109-A21 RD-4
304-A22 WH-8
304-A22 WH-8
304-A22 WH-8
158-A12 BR-14
158-A12 BR-14
158-A12 BR-14
118-A9 GY-14
118-A9
GY-14
118-A9 GY-14
116-A8 BR-14
116-A8 BR-14
116-A8 BR-14
663-A129 GY-18
663-A131 GY-18
663-A130 GY-18
600-A128 BR-18
270-J1 BK-18
271-J2 BK-18
274-J3 BK-18
275-J4 BK-18
201-J5
L21
L23
L16
L17
L18
L14
L30
L21
L9
L9
L21
L10
L16
L10
L16
L4
L4
BK-18
261-K2 BK-18
G939-K1 BK-18
E707-A116 GN-18
E707-A116 GN-18
E707-A116 GN-18
K997-A111 BU-18
K997-A111 BU-18
K997-A111 BU-18 K997-A111 BU-18
442-A103 GY-18
442-A103 GY-18
442-A103 GY-18
442-A103 GY-18
447-A102 PK-18447-A102 PK-18
447-A102 PK-18
447-A102 PK-18
C413-A117 YL-18
C413-A117 YL-18
C413-A117 YL-18
C414-A106 BU-18
C414-A106 BU-18
C414-A106 BU-18
E708-A112 PK-18
E708-A112 PK-18
E708-A112 PK-18
270-A115 BK-18
270-A115 BK-18
270-A115 BK-18
271-A99 BK-18
271-A99 BK-18
271-A99 BK-18
272-A104 BK-18
272-A104 BK-18
272-A104 BK-18
273-A110 BK-18
273-A110 BK-18
273-A110 BK-18
274-A107 BK-18
274-A107 BK-18
274-A107 BK-18
275-A101 BK-18
275-A101 BK-18
275-A101 BK-18
260-A35 BK-18
260-A35 BK-18
260-A35 BK-18
261-A36 BK-18
261-A36 BK-18
261-A36 BK-18
262-A37 BK-18
262-A37 BK-18
262-A37 BK-18
263-A38 BK-18
263-A38 BK-18
263-A38 BK-18
105-A19 RD-18
105-A19 RD-18
105-A19 RD-18
105-A19 RD-18
308-A26 YL-18
308-A26 YL-18
308-A26 YL-18
308-A26 YL-18
306-A25 GN-18
306-A25 GN-18
306-A25 GN-18
306-A25 GN-18
326-A152 RD-18
326-A152 RD-18
326-A152 RD-18
326-A152 RD-18
403-A114 GN-18
403-A114 GN-18
403-A114 GN-18
403-A114 GN-18
403-A114 GN-18
405-A109 GY-18
405-A109 GY-18
405-A109 GY-18
405-A109 GY-18
405-A109 GY-18
443-A113 YL-18
443-A113 YL-18
443-A113 YL-18
443-A113 YL-18
443-A113 YL-18
310-A154 PU-18
310-A154 PU-18
310-A154 PU-18
310-A154 PU-18
F842-A54 BU-18
F842-A54 BU-18
F842-A54 BU-18 F842-A54 BU-18
975-A149 WH-14
975-A45 WH-14
975-A45 WH-14
975-A45 WH-14
975-A124 WH-18
975-A124 WH-18
975-A150 WH-18
975-A150 WH-18
975-A150 WH-18
600-A135 BR-18
600-A135 BR-18
600-A136 BR-18
600-A136 BR-18
600-A134 BR-18
600-A134 BR-18
THIS SCHEMATIC IS FOR THE 973C TRACK TYPE LOADER T738H (141-8683)
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF
AND XMSN SHIFTER IN NEUTRAL.
UNLESS OTHERWISE SPECIFIED ALL WIRE IS GAUGE 18.
158-L01 BR-14
521-L02 YL-14
200-L03 BK-14
200-L06 BK-14
200-L05 BK-14
593-L07 GN-14
593-L09 GN-14
593-L08 GN-14
200-L04 BK-14 516-H11 GN-14
517-H10 BU-14
522-H09 WH-14
515-H05 GY-14
515-H07 GY-14
515-H06 GY-14
515-H08 GY-14
200-H01 BK-14
200-H02 BK-14
200-H03 BK-14
200-H04 BK-14
592-E22 BU-18
A513-E21 PK-18
509-E23 WH-18
508-E24 PU-18
511-E25 BR-18
512-E26 GN-18
517-A158 BU-14
516-A157
GN-14
515-A156 GY-14
502-E09 OR-18
500-E10 BR-18
501-E11 GN-18
505-E43 BU-18
503-E15 BR-18
504-E17 YL-18
118-E28 GY-18
118-E29 GY-18
118-E12 GY-18
118-E27 GY-18
118-E30 GY-18
118-E31 GY-18
118-E16 GY-18
118-E03 GY-14
118-E03 GY-14
118-E03 GY-14
118-E03 GY-14
506-E06 PU-18
506-E06 PU-18
506-E06 PU-18
506-E06 PU-18
507-E07 WH-18
507-E07 WH-18
507-E07 WH-18
507-E07 WH-18
410-E04 WH-18
410-E04 WH-18
410-E04 WH-18
410-E04 WH-18
158-E08 BR-14
158-E08 BR-14
158-E08 BR-14
124-A13 GN-14
124-A13 GN-14
124-A13 GN-14
124-A13 GN-14
124-A13 GN-14
522-A155 WH-14
522-A155 WH-14
522-A155 WH-14
521-A151 YL-14
521-A151 YL-14
521-A29 YL-14
521-A29 YL-14
521-E01 YL-14
521-E01 YL-14
521-E01 YL-14
521-A159 YL-14
521-A159 YL-14
102-E38 RD-18
102-E19 RD-18
102-E02 RD-18
102-E02 RD-18
102-E02 RD-18
102-E02 RD-18
200-E36 BK-10
200-E20 BK-18
200-E18 BK-18
200-E35 BK-18
200-E34 BK-18
200-E33 BK-18
200-E37 BK-14
200-E32 BK-18
200-E39 BK-14
200-E42 BK-14
200-E14 BK-18
615-E41 YL-18
615-E40 YL-18
615-E05 YL-18
615-E05 YL-18
615-E05 YL-18
200-E13 BK-18
410-E04 WH-18
118-A9 GY-14
158-A12 BR-14
116-A8 BR-14
521-A29 YL-14
200-A91 BK-14
200-A81 BK-18
200-A80 BK-18
200-A172 BK-18
128-A84 PK-18
128-A15 PK-18
128-A15 PK-18
201-A75 BK-18
201-A76 BK-18
201-A77 BK-18
201-A79 BK-18
291-A87 BK-18
291-A89 BK-18
761-A83 GY-18
761-A83 GY-18
761-A83 GY-18
762-A82 YL-18
762-A82 YL-18
762-A82 YL-18
128-A88 PK-18
128-A88 PK-18
128-A88 PK-18
E735-A86 PU-18
E735-A86 PU-18
E735-A86 PU-18
E735-A86 PU-18
E735-A86 PU-18
E735-A108 PU-18
E735-A108 PU-18
E735-A108 PU-18
E735-A108 PU-18
290-A85 BK-18
290-A85 BK-18
290-A85 BK-18
290-A85 BK-18
290-A85 BK-18
290-A85 BK-18
290-A85 BK-18
291-A165 BK-18
291-A165 BK-18
291-A165 BK-18
291-A165 BK-18
291-A165 BK-18
291-A165 BK-18
291-A165 BK-18
IDENT PART NO. CHG NOTE
A
HARNESS AS.
C
113-A10 OR-18
113-A10 OR-18
113-A10 OR-18
113-A11 OR-18
113-A11 OR-18
113-A11 OR-18
113-A11 OR-18
113-A11 OR-18
113-A11 OR-18
164-A14 WH-14
164-A14 WH-14
164
-A14
WH
-14
893-A46
GN-18
893-A46 GN-18
892-A43 BR-18
892-A43 BR-18
892-A40 BR-18
893-A41 GN-18
114-A16 RD-18
114-A16 RD-18
114-A16 RD-18
114-A16 RD-18
129-A17 RD-18
129-A17 RD-18
129-A17 RD-18
129-A17 RD-18
129-A17 RD-18
129-A17 RD-18
411-A96 PK-18
411-A96 PK-18
E707-A116 GN-18
E708-A112 PK-18
C413-A117 YL-18 C414-A106 BU-18
201-A127 BK-18
201-A127 BK-18
201-A98 BK-18201-A98 BK-18
201-A98 BK-18
201-A97 BK-18
201-A97 BK-18
201-A97 BK-18
201-A94 BK-18
201-A94 BK-18
411-A96 PK-18
201-A78 BK-14
201-A78 BK-14
202-A42 BK-14
202-A42 BK-14
202-A42 BK-14
893-A100 GN-18
893-A100 GN-18
893-A100 GN-18
893-A100 GN-18
893-A100 GN-18
893-A100 GN-18
893-A100 GN-18
892-A105 BR-18
892-A105 BR-18
892-A105 BR-18
892-A105 BR-18
892-A105 BR-18
892-A105 BR-18
892-A105 BR-18
507-A34 WH-18
507-A34 WH-18
507-A34 WH-18
507-A34 WH-18
506-A33 PU-18
506-A33 PU-18
506-A33 PU-18 506-A33 PU-18
G939-A153 PK-18
G939-A153 PK-18
G939-A153 PK-18
G939-A160 PK-18
G939-A160 PK-18
G939-A39 PK-18
G939-A39 PK-18
G939-A39 PK-18
G939-A39 PK-18
G939-A39 PK-18
G939-A39 PK-18
G939-A49 PK-14
G939-A49 PK-14
G939-A49 PK-14
G939-A49 PK-14
102-A30 RD-18
102-A30 RD-18
102-A18 RD-12
102-A18 RD-12
102-A18 RD-12
102-A27 RD-12
102-A27 RD-12
102-A27 RD-12
102-A27 RD-12
102-A28 RD-12
102-A28 RD-12
102-A28 RD-12
102-A28 RD-12
G939-A171 PK-18
G939-A171 PK-18
200-A147 BK-8
200-A146 BK-18
200-A24 BK-18
200-A24 BK-18
200-A24 BK-18
200-A24 BK-18
200-A23 BK-18
200-A23 BK-18
200-A23 BK-18
200-A23 BK-18
200-A164 BK-18
200-A163 BK-18
200-A23 BK-18
200-A24 BK-18
200-A93 BK-14
200-A93 BK-14
200-A93 BK-14
200-A93 BK-14
200-A93 BK-14
200-A92 BK-14
200-A92 BK-14
200-A92 BK-14
200-A92 BK-14
200-A92 BK-14
200-A162 BK-14
200-A145 BK-14
200-A145 BK-14
200-A145 BK-14
200-A133 BK-18
200-A133 BK-18
200-A132 BK-18
200-A132 BK-18
200-A148 BK-8
200-A144 BK-18
200-A144 BK-18
200-A144 BK-18
200-A144 BK-18
200-A144 BK-18
200-A143 BK-18
200-A143 BK-18
200-A143 BK-18
200-A143 BK-18
200-A143 BK-18
200-A142 BK-18
200-A142 BK-18
200-A142 BK-18
200-A142 BK-18
200-A142 BK-18
200-A169 BK-18
200-A169 BK-18
200-A169 BK-18
200-A169 BK-18
200-A95 BK-18
200-A95 BK-18
200-A95 BK-18
200-A95 BK-18
200-A95 BK-18
200-A95 BK-18
200-A95 BK-18
410-A31 WH-18
410-A31 WH-18
410-A31 WH-18
410-A31 WH-18
410-A31 WH-18
410-A31 WH-18
615-A32 YL-18
615-A32 YL-18
615-A32 YL-18
615-A32 YL-18
R
E
F
G
H
L
WIRE AS.
K
J
N
P
158-2182 -00
158-2183 -00
117-7031 -01
117-7032 -01
CABLE AS.
T
U
V
W
150-8252 -00
124-0376 -00
4E-1716 -01
166-7863 -01
610-A167 OR-14
610-A167 OR-14
610-A167 OR-14
610-A161 OR-14
610-A90 OR-14
610-A90 OR-14
610-A90 OR-14
610-A125 OR-14
610-A125 OR-14
610-M1 OR-14
610-M3 OR-14
610-M5 OR-14
200-M6 BK-14
200-M2 BK-14
200-M4 BK-14
101-V1 RD-00101-W1 RD-00
200-T1 BK-00 200-U1 BK-00
308-A170 YL-18
308-A170 YL-18
308-A170 YL-18
308-A170 YL-18
600-A166 BR-18
600-A166 BR-18
600-A166 BR-18
600-A166 BR-18
600-A168 BR-18
600-A168 BR-18
600-A168 BR-18
600-A168 BR-18
E903-C1 YL-18
E903-C1 YL-18
E903-C1 YL-18
E902-C2 PU-18
E902-C2 PU-18
E902-C2 PU-18
322-A141 GY-18
610-A90 OR-14
851-A67 WH-18
113-A10
CONN 12
CONN 11
OR-18
200-A92 BK-14
109-R3 RD-4
311-R21 WH-18
506-A33 PU-18
507-A34 WH-18
522-A155 WH-14
200-E13 BK-18
102-E02 RD-18
410-E04 WH-18
124-A13 GN-14
521-A159 YL-14
522-A155 WH-14
200-A145 BK-14
200-E14 BK-18
326-A152 RD-18
310-A154 PU-18
975-A150 WH-18
164-A14 WH-14
164-A174 WH-14
164-A174 WH-14
164-A174 WH-14
164-A174 WH-14
164-A174 WH-14
164-A174 WH-14
164-A173 WH-18
164-A173 WH-18
164-A173 WH-18164-A173 WH-18
164-A173 WH-18
164-A173 WH-18
164-A173 WH-18
164-A173 WH-18
201-A175 BK-18
201-A175 BK-18
201-A175 BK-18
201-A175 BK-18
201-A175 BK-18
201-A175 BK-18
442-C17 GY-18
442-C17 GY-18
442-C17 GY-18
K997-C16 BU-18
K997-C16 BU-18
A485-C20 BU-18
A485-C20 BU-18
201-C19 BK-18
201-C19 BK-18
201-C19 BK-18
A485-A179 BU-18
A485-A179 BU-18
A485-A179 BU-18
A485-A179 BU-18
892-A105 BR-18
893-A100 GN-18
F794-A181 BU-18
F794-A181 BU-18
F794-A181 BU-18
F794-A181 BU-18
F794-A181 BU-18
F794-A181 BU-18
F795-A182 YL-18
F795-A182 YL-18
F795-A182 YL-18
F795-A182 YL-18
F795-A182 YL-18
F795-A182 YL-18
114-A180 RD-18 114-A180 RD-18
114-A180 RD-18
114-A180 RD-18
K997-C22 BU-18
K997-C21 BU-18
K997-C21 BU-18
A485-C20 BU-18
200-A186 BK-18
200-A186 BK-18
200-A186 BK-18
200-A186 BK-18
200-A186 BK-18
200-A183 BK-18
200-A183 BK-18
200-A183 BK-18
200-A183 BK-18
600-A185 BR-18
600-A185 BR-18
600-A184 BR-18
600-A184 BR-18
600-A184 BR-18
600-A184 BR-18
G939-A176 PK-18
G939-A176 PK-18
F842-A54 BU-18
R985-A178 WH-18
R985-A178 WH-18
R985-A178 WH-18
R985-A178 WH-18
R985-A178 WH-18
R986-A177 BU-18
R986-A177 BU-18
R986-A177 BU-18
R986-A177 BU-18
R986-A177 BU-18
G939-A176 PK-18
101-W1 RD-00
NOTE A: THE FOLLOWING WIRE PAIRS MUST BE TWISTED AT LEAST 1 TURN/25 MILLIMETERS
(831-PK/F796-GY) (892-BR/893-GN) (E900-WH/E901-GN) (E902-PU/E903-YL)
NOTE B: NORMALLY OPEN BEFORE REFRIGERANT CHARGE
NOTE C: THE FOLLOWING ARE COMMUNICATED VIA DATA LINK (ENGINE SPEED,
CHARGE PRESSURE, SERVICE CODES)
NOTE D
NOTE D: PILOT VALVE OPTIONS
127-0860 TWO LEVERS
127-0861 TWO LEVERS + AUX
127-0862 JOYSTICK (STD)
127-0823 JOYSTICK + AUX
NOTE E: RADIO OPTIONS
12 VOLT RADIOS
3E-7140 FIXED U.S
3E-6107 FIXED EUROP
24 VOLT RADIOS
9X-6779 FIXED U.S
3E-7890 FIXED EUROP
NOTE F: FOR O.ROPS CAB, THE O.ROPS HARNESS (IDENT. Z) REPLACES
THE CAB HARNESS (IDENT. E).THE ONLY CIRCUITS USED IN
THE O.ROPS HARNESS ARE 410-WH AND 615-YL.
NOTE B
NOTE E
NOTE F
M
Z
168-6252 -04
154-0855 -01
154-4213 -02
138-8627 -02
135-7619 -02
166-7864 -02
120-6564 -02
123-8329 -05 ATTACH
160-7576 -01 ATTACH
126-2336 -02 ATTACH
201-A94 BK-18
600-A134 BR-18
600-A185 BR-18
114-A16 RD-18
201-C14 BK-18
FORWARD HORN
7T0969
RUN LAMP LH
1336336
RUN LAMP RH
1336336
FRAME GND BOSS
0
ALT ENG GND
0
1
2
3
4
C-C7
CONN 17
3E3376
1
2
G-C1
1552272
3
4
1
2
3
G-C2
7N7782
GND
+ BATTERY
SOLENOID
BK
OR
BU
LIFT KICKOUT
8C9763
1
2
3
G-C3
7N7781
+ BATTERY
SOLENOID
GND
OR
BU
BK
BUCKET POSITIONNER
8C9759
A-C8
1552267
A
B
C
A-C9
1552267
A
B
C
A-C10
1552267
A
B
C
LEFT STEERING PEDAL SENSOR
1471680
A
B
C
+V SENSOR
GROUND
SIGNAL
OR
BK
YL
BRAKE PEDAL SENSOR
1471680
A
B
C
+V SENSOR
GROUND
SIGNAL
OR
BK
YL
RIGHT STEERING PEDAL SENSOR
1471680
A
B
C
+V SENSOR
GROUND
SIGNAL
OR
BK
YL
1
2
A-C15
3E3382
3
4
5
6
1
2
C-C9
1552273
3
4
5
6
1
2
C-C1
CONN 14
CONN 15
1552252
3
4
5
6
7
8
9
10
11
12
1
2
A-C3
3E5179
3
4
5
6
7
8
9
10
11
12
NC
NOCOM
XMSN CONTROL BRAKE SW
6G4195
A-C7
1552267
A
B
C
+V SENSOR
GROUND
SIGNAL
SPEED DIRECTION SNSR
1471680
OR
BK
YL
A
B
C
NC
NOCOM
GOVERNOR LEVER SW
6G4195
FWD HORN SW
3T2357
FUEL LEVEL SENDER
1578836
1
2
F-C1
3E5179
3
4
5
6
7
8
9
10
11
12
F-C4
3E3370
A
B
C
+V SENSOR
GROUND
SIGNAL
OR
YL
GN
A
B
C
CHG PRESS SENSOR
1477318
1
2
F-C5
3E3364
1
2
F-C6
3E3364
LEFT FORWARD SOL
1303310
1
2
LEFT REVERSE SOL
1303310
1
2
F-C7
3E3364
1
2
OVERRIDE SOL
1303310
1
2
SYNCH SOL
1306913
1
2
F-C2
1552269
1
2
F-C8
3E3364
1
2
F-C9
3E3364
1
2
F-C3
1552269
1
2
RIGHT FORWARD SOL
1303310
1
2
RIGHT REVERSE SOL
1303310
1
2
PARK BRAKE SOL
1164152
1
2
A-C4
1552252
3
4
5
6
7
8
9
10
11
12
1
2
C-C2
1552269
DRIVE RPM SENSOR LH
6V2455
DRIVE RPM SENSOR RH
6V2455
1
2
A-C11
1552273
3
4
5
6
1
2
K-C1
3E3382
HARNESS
CODE
CONNECTOR
SERVICE
TOOL
CONNECTOR
3
4
5
6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
A-C5
1010205
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
A-C6
3E6287
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
1
2
3
4
5
6
7
8
A-C2
1552264
1
2
J-C1
CONN 16
CATERPILLAR
MONITORING
SYSTEM
HARNESS CODE
CONNECTOR
3E3388
3
4
5
6
7
8
+ BATTERY
GROUND
DATA LINK -
LEFT REVERSE SOL.
UNUSED
UNUSED
SOLENOID RETURN
UNUSED
DATA LINK +
LEFT FORWARD SOL.
RIGHT REVERSE SOL.
UNUSED
2 LEVEL LIFT SW. (N/C)
UNUSED
SWITCH RETURN
UNUSED
RIGHT FORWARD SOL.
UNUSED
2 LEVEL LIFT SW. (N/O)
IDENT. CODE 2
UNUSED
UNUSED
GOVERNOR SW. (N/C)
IDENT. CODE 1
TRAVEL SPEED
WORKING SPEED
UNUSED
UNUSED
IDENT. CODE 3
IDENT. CODE 0
PARK BRAKE SW. (N/C)
UNUSED
UNUSED
UNUSED
GOVERNOR SW. (N/O)
UNUSED
A.I.H SW. (N/O)
UNUSED
PARK BRAKE SW. (N/O)
UNUSED
SYNCH. SOL.
UNUSED
UNUSED
CENTRAL PEDAL SENSOR
RIGHT PEDAL SENSOR
COOLANT TEMP. SENSOR
OVERRIDE SOL.
2 LEVEL LIFT SOL.
UNUSED
CHARGE PRESS. SENSOR
LEFT PEDAL SENSOR
+8V SENSOR SUPPLY
A.I.H RELAY
LEFT TRACK SPEED -
UNUSED
UNUSED
UNUSED
SPEED/DIRECTION SENSOR
BRAKE VALVE SOL.
LEFT TRACK SPEED +
UNUSED
UNUSED
ENGINE SPEED -
RIGHT TRACK SPEED +
UNUSED
UNUSED
UNUSED
UNUSED
ENGINE SPEED +
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
RIGHT TRACK SPEED -
UNUSED
BACKUP ALARM
UNUSED
UNUSED
UNUSED
ELECTRONIC
HYDROSTATIC CONTROL
160-1758
R-C1
1552252
10
11
12
T
XMSN OIL TEMP SENDER
4W9972
1
2
R-C6
1552269
ENG OIL PRESS SW
3E7692
1
2
R-C3
1552269
ENGINE SPEED SENSOR
6V2455
1
2
SHUTDOWN SOL
155-4653
1
2
R-C9
1552269
SUPPRESSOR ARC DIODE
1068704
1
2
1
2
R-C8
1552269
1
2
3
AIR CONDITIONNING HI LO SW
1145333
R-C2
1552267
A
B
C
T
START AID TEMP SW
3E6449
1
2
R-C10
1552269
1
2
C-C5
1552269
BK-16
BK-16
1
2
BACKUP ALARM
1236449
1
2
C-C6
1552269
ALT
+ R
GND
ALTERNATOR
1077977
MOTOR
G S
MTR BAT
STARTER
1047040
12V BATTERY RH
9X9721
NEG POS
12V BATTERY LH
9X9721
NEG POS
DISCONNECT SW
7N0718
1
2
R-C4
123456789101112
13
1415
123456789101112
13
1415
1552269
1
2
BK
BK
START AID SOL
3E6332
BK
BK
AIR CONDITIONNING CLUTCH COIL
1011759
1
2
3
4
5
6
7
8
9
10
11
12
A-C12
3E5179
ST
ON
OFF
B
S
C
R
KEY START SW
9G7641
START KEY
10A
LIGHTS
20A
CIGAR LIGHTER
10A
HORN
10A
KICKOUT
10A
TEHC
10A
FANS
20A
AIR COND
20A
SYSTEM MONITOR
10A
WIPER RADIO
10A
AUX.
15A
ALT BREAKER
9S4693
80A
START RELAY
1251302
1
2
A-C16
1552269
1
A-C17
9G4349
1
R-C11
9G4352
1
A-C18
9G4348
1
R-C12
9G4351
1
A-C19
9G4351
1
R-C13
9G4348
1
2
A-C20
3E3388
3
4
5
6
7
8
1
2
3
4
5
6
7
8
E-C8
1552264
2
1
A-C21
3E3364
2
1
A-C31
1552269
A C BLOWER SW
6P3236
1
2
5
4
3
1
3
4
6
2
5
LAMP SW
3E2210
3
2
AIH SW
1126169
1
3
2
SNSR SPD CAL SW
9G0011
SERVICE SW
9D3721
CLEAR SW
9D3721
BUCKET
SOL
LIFT
SOL
BUCKET
FLOAT
SOL
PILOT VALVE CONTROL
1280862
1
2
3
4
5
6
OR
BK
GN
WH
YL
BU
GAUGE CLUSTER
1005895
+V DISPLAY
GROUND
CLOCK
DATA
LOAD
HARN CODE
1
2
A-C24
1552273
3
4
5
6
DIMMING RESISTOR
1166203
1
2
A-C23
1552269
OPERATOR SW INPUT
ACTION LAMP
GROUND
HARNESS CODE 0
HARNESS CODE 1
HARNESS CODE 2
HARNESS CODE 5
MODULE CLOCK
MODULE LOAD
MODULE DATA
SERVICE
CLEAR
ENG. OIL PRESS. SW
XMSN OIL TEMP.
CAT DATA LINK -
CAT DATA LINK +
+ BATTERY
POWERTRAIN OIL TEMP.
+8V SENSOR SUPPLY
FUEL LEVEL SENDER
ACTION ALARM
SEMS
HARNESS CODE 3
HARNESS CODE 4
CLUSTER +V
ALTERNATOR
CATERPILLAR MONITORING SYSTEM
1005778
IMPL HYD OIL TEMP
18
13
2
31
3
12
22
16
6
25
34
15
35
23
33
1
30
19
28
14
5
10
24
9
A-C1
8T9834
4
29
7
8
11
17
20
21
26
27
32
36
37
38
39
40
1
3
4
6
2
5
OPERATOR SW
1236361
REAR WIPER SW
119-4436
B
B
H
L
P
W
HIGH SPEED
PARK
LOW SPEED
GND
B+
WASHER PUMP
B+
WH-14
BU-14
YL-14
BK-18
RD-18
BN-18
RD-14
FRONT WIPER SW
3E0155
4
1
E-C13
1552273
2
6
3
5
GN-16
BK-16
GY-16
BR-16
OR-16
L
H
P
B+
T
GND
FRONT WIPER MOTOR
1466149
GN-16
BK-16
GY-16
BR-16
OR-16
L
P
B+
T
GND
REAR WIPER MOTOR
9X5601
1
2
3
4
E-C7
7N8205
4
6
E-C5
1552264
5
3
2
8
7
1
LEFT SPEAKER
6T7695
+
-
RIGHT SPEAKER
6T7695
+
-
+24V SWITCHED IN
+12V MEMORY
+12V SWITCHED OUT
+24V BATTERY IN
GROUND
GROUND
CONVERTER 12V/24V
1503212
2
4
5
6
3
1
WH/BK,GN/BK
WH,GN
BK
YL
RD
GY/BK,PU/BK
GY,PU
1
2
3
4
5
6
7
8
LH SPK (-)
LH SPK (+)
GROUND
+12V MEM
+12 VOLT
RH SPK (-)
RH SPK (+)
ANTENNA
12V RADIO
1
2
E-C12
1552264
3
4
5
6
7
8
MOTOR BK-14
WH/RD-14
1
2
MOTOR RH
1062721
MOTOR BK-14
WH/RD-14
1
2
MOTOR LH
1062721
E-C1
1552267
A
B
C
L-C1
3E3370
A
B
C
1
2
RD
BK
ACTION ALARM
3E6328
1
2
E-C6
155-2269
ANTENNA
3A8746
RESISTOR
9G1950
MOTOR
BK-14
WH/RD-14
1
2
BLOWER MOTOR RH
3E6386
MOTOR
BK-14
WH/RD-14
BLOWER MOTOR LH
3E6387
MOTOR
WASHER PUMP FRT
7T8890
MOTOR
WASHER PUMP REAR
7T8890
T
THERMOSTAT
3E5464
CAB FLOOD LAMP LH
1129378
1
2
E-C3
1552269
CAB FLOOD LAMP RH
1129378
1
2
E-C4
1552269
1
2
L-C2
1552269
1
2
L-C3
1552269
RELAY
3E5239
1
2
H-C1
3E3364
1
2
H-C2
1552269
1
2
H-C3
3E3382
CONN 13
5
3
4
6
1
2
A-C25
1552273
5
3
4
6
1
E-C2
7X1041
WH
BK
RD
DOME LAMP
3E6389
E-C10
1552267
A
C
B
CAB GND
3
4
A-C22
1552273
2
5
1
6
J
H
G
E
F
D
C
B
A
A-C26
8T8736
CIGAR LIGHTER
9W0335
SYMBOL DESCRIPTION
BLADE, SPADE, RING,
OR SCREW TERMINAL
SPLICE
CIRCUIT NOT CONNECTED
ELECTRICAL CONNECTION
TO MACHINE STRUCTURE
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
CONNECTOR
ATCH WIRE, CABLE,
COMPONENT
CIRCUIT GROUPING
DESIGNATION
L#
ABBREV COLOR
RD
WH
OR
YL
PK
BK
GY
PU
BR
GN
BU
RED
WHITE
ORANGE
YELLOW
PINK
BLACK
GREY
PURPLE
BROWN
GREEN
BLUE
ACTION LAMP
3T0304
1
PLATFORM GND BOSS
FRAME GND BOSS FRT
REAR LIGHT LH
1355549
1
2
WH-18
BK-18
REAR LIGHT RH
1355549
1
2
WH-18
BK-18
1
2
M-C1
1552269
1
2
M-C2
1552269
1
2
M-C3
CONN 1
3E3364
GND BOSS
1
2
A-C27
1552269
1
2
A-C28
1552269
1
2
E-C11
1552273
3
4
5
6
1
2
C-C3
1552269
STRIP
1177030
GROUND STRAP
8X5804
DASH GND BOSS
A-C34
1552267
A
B
C
A-C13
3E3370
A
B
C
1
2
A-C14
3E3364
MAIN RELAY
167-0138
C-C10
1552267
A
B
C
C-C4
1552267
A
B
C
1
A
3
2
B
D
TRAVEL SW
1552719
C
C
A-C30
3T3158
C
A-C29
3T3158
A-C32
3T4412
A-C33
3T4412
1
2
R-C7
1552269
IMPLEMENT
HYD OIL TEMP
1520649
A
B
C
+8 VOLTS
GROUND
SIGNAL
OR-18
BK-18
YL-18
+8 VOLTS
SIGNAL
GROUND
POWERTRAIN OIL TEMP SNSR
1520649
OR-18
YL-18
BK-18
+8 VOLTS
SIGNAL
GROUND
COOLANT TEMP SENSOR
1520649
OR-18
YL-18
BK-18
A
B
C
1
2
C-C8
1552269
A
B
C
D
E
F
G
H
J
A
B
C
D
E
F
G
H
J
L13
L11
L12
L23
L14
L30
L12
L11
L13
L25
L22
L12
L18
L2
L26
L2
L5
L14
L23
L22
L15 L17
L23L21
L21
L5
L16
L22
L2
L15
L2
L5
L16
L10
L2
L10
L21
L5
L16
L22
L7
L24
L25
L26L26
L25
L11
L8
L9
L5
L7
L2
L8
L16
L22
L21
L7L6
L16
L21
L22
L9
L8
L2
L26
L5
L4
L5
L1
L19
L20
L20
L4
L8
L22
L9
L8
L27
L22
L4
L27
L27
L3
L19
L26
L16
L21
L22
L9
L8
L4
L3L2L1
L6
L21
L16
L22
L9
L8
L26
L15
L26
L26
CONN 2
CONN 3
CONN 4
CONN 5
CONN 6
CONN 8
CONN 7
CONN 10
CONN 9
L30
L30
L30
L30
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.
CATERPILLAR MONITORING CIRCUIT.
PANEL LAMP CIRCUIT.
WIPER/WASHER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
START AID CIRCUIT.
ELECTROSTATIC HYDRAULIC
CONTROL CIRCUIT.