953C TRACK-TYPE LOADER ELECTRICAL SYSTEM SCHEMATIC

©
2001 Caterpillar
All Rights Reserved
Printed in U.S.A.
SENR1774-01
March 2001
953C Track-Type Loader
Electrical System
2ZN1750-UP
Machine Harness Connector And Component Locations
F01801
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
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.
¹The FMI is a diagnostic code that indicates what type of failure has occurred.
Mode Number
0
1
2
3
4
5
Monitoring System Mode
Mode of Operation
Normal
Harness Code
Parameter Display
Service
Tattletale
Electronic Hydrostatic Control
Sales Model Machine Code
953C 09
Machine Codes
CID No.
Component
096 Fuel Level Sensor
110 Engine Coolant Temperatuer Sensor
177 Torque Converter Oil Temperature Sensor
248 CAT Data Link
263 8 Volt Sensor Power Supply
271 Action Alarm
324 Action Lamp
600 Hydraulic Oil Temperature Sensor
601 Brake Air Pressure
819 Display Data Link
821 9 Volt Display Power Supply
830 Brake Oil Temperature
070 Parking Brake Switch
110 Engine Coolant Temperatuer Sensor
168 Electrical System Voltage
190 Engine RPM Sensor
269 Sensor Supply Voltage
296 Electronic Control Module
299 Transmission Lever Position Sensor
349 Transmission Sync Solenoid
358 Pilot Pressure Supply Actuator
463 Implement Dual Pressure Relief Solenoid
464 Implement Tilt Lever Position Switch
465 Governor Control Lever Switch
466 Left Track Steering Pedal Position Sensor
467 Right Track Steering Pedal Position Sensor
468 Service Brake Pedal Position Switch
469 Left Track Forward Direction Solenoid
470 Left Track Reverse Direction Solenoid
471 Right Track Forward Direction Solenoid
472 Right Track Reverse Direction Solenoid
473 Charge Pressure Sensor
617 Air Inlet Heater Relay
650 Harness Code
681 Parking Brake Solenoid
Component Identifiers (CID¹) and
¹ The CID is a diagnostic code that indicates which component is faulty.
² The MID is a diagnostic code that indicates which electronic control
module diagnosed the fault.
Caterpillar Monitoring System (Mid No. 30)
Electronic Hydrostatic Control (Mid No. 79)
Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
Alarm - Action D-4
A
Sender - Transmission Oil Temp B-7
14
Alarm - Backup C-8
1
Sensor - Bucket Positioner C-1
27
Alternator D-8
2
Sensor - Center Pedal B-2
15
Batteries A-8
32
Sensor - Charge Pressure C-5
16
Breaker - Alt A-6
E
Sensor - Coolant Temp C-8
2
Caterpillar Monitoring System A-2
A
Sensor - Hydraulic Oil Temp C-1
17
Control - Electronic Hydrostatic A-5
E
Sensor - Left Steering Pedal B-2
15
Control - Pilot Valve A-4
B
Sensor - Lift Kickout C-1
28
Converter B-4
D
Sensor - Right Steering Pedal B-2
15
Diode - Arc Suppresor B-8
4
Sensor - RPM A-6
18
Fuses A-7
E
Sensor - RPM C-6
18
Gauge Cluster D-2
A
Sensor - Speed/Direction D-3
19
Ground - Cab Roof C-4
D
Solenoid - A/C Clutch B-8
4
Grond - Dash C-2
A
Solenoid - Engine Shutdown B-8
20
Ground - Engine D-7
5
Solenoid - Left Forward C-5
16
Ground - Engine D-8
2
Solenoid - Left Rev C-5
16
Ground - Engine D-8
2
Solenoid - Override C-5
16
Ground - Front Frame D-2
6
Solenoid - Park Brake C-5
16
Ground - Left Frame C-7
3
Solenoid - Right Forward C-5
16
Ground - Left Frame A-8
3
Solenoid - Right Rev C-5
16
Ground - Platform D-2
6
Solenoid - Start Aid D-7
21
Ground - Rear Frame D-7
3
Solenoid - Sync C-5
22
Heater - Air Inlet D-7
7
Solenoid - Two Level Lift Relief C-1
17
Horn - Forward D-1
6
Switch - A/C High/Low B-8
4
Lamp - Action B-2
A
Switch - Air Inlet Heater C-2
A
Lighter - Cigar B-2
A
Switch - Blower B-4
B
Motor - Blower B-5
8
Switch - Clear A-4
23
Motor - Condensor B-5
9
Switch - Disconnect A-8
21
Motor - Front Washer D-4
10
Switch - Dual Relief C-1
29
Motor - Front Wiper D-4
11
Switch - Engine Oil B-7
24
Motor - Rear Washer D-4
10
Switch - Forward Horn C-3
C
Motor - Rear Wiper D-4
12
Switch - Front Wiper C-4
25
Motor - Starter D-7
5
Switch - Governor Level C-3
C
Radio B-4
D
Switch - Key Start B-2
A
Relay - Air Inlet D-7
7
Switch - Lamp C-2
A
Relay - Main A-7
E
Switch - Operator/Start Aid C-2
A
Relay - Start A-6
E
Switch - Rear Wiper C-4
25
Relay Assembly B-5
9
Switch - Sensor/Speed Cal A-4
23
Resistor - Blower Motor B-5
8
Switch - Service A-4
23
Resistor - Dimming C-2
A
Switch - Start Aid Temp C-8
2
Sender - Engine Speed B-7 5 Switch - Thermostat B-5 8
Sender - Fuel Level D-1 13 Switch - Transmission Contrl Brake D-3 C
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.
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 E
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 Caterpillar Monitoring
System Harness Code
C-2 A
CONN 17 C-1 30
¹The connectors shown in this chart are for harness to harness
connectors. Connectors that join a harness to a component are
generally located at or near the component. See the Component
Location Chart.
Related Electrical Service Manuals
Form No.
SENR4757
SENR6717
SENR8314
Consist: 6V-5720
SENR3581
Consist: 106-8557
SENR3859
Starting Motor: (104-7040)
Title
Alternator: (132-2156)
Caterpillar Monitoring System
Electronic Hydrostatic Control
Resistor, Sender and Solenoid Specifications
Part No. Component Resistance (Ohms)¹
3E-6332 6.0
3E-8574
34.3 ± 1.7
4W-9972
54
o
C (130 ± F) - 560 to 716
110
o
C (230 ± F) - 72 to 82
6V-2455 110-200
8C-3663
1.55 ± 0.15
10.3 ± 1.03
9G-1950
Overall 2.0 ± .1 ; Tap 1.0 ± .05
101-1759
14.4 ± 0.6
116-4152
34.3 ± 1.7
116-6203
20 ± 1.0
130-3310
7.75 ± 1.00
130-6913 33.6
¹ At room temperature unless otherwise noted.
Solenoid - Start Aid
Solenoid - Two Level Lift Relief
Sender - Engine Speed
Resistor - Dimming
Solenoid - Left Forward
Left Reverse
Right Forward
Right Reverse
Override
Solenoid - Sync
Sender - Transmission Oil
Temperature
Solenoid - Engine Shutdown
Start (Latch) Coil
Stop (Unlatch) Coil
Resistor - A/C Motor
Solenoid - A/C Clutch
Solenoid - Park Brake
Off Machine Switch Specification
Part No. Actuate Deactuate Contact Position
3E-6449 Start Aid Temperature 38.0 ± 3.0 °C (100.4 ± 5.4 °F) 27.0 °C (80.5 °F) Normally Closed
3E-7692
Dual Relief Pressure
Engine Oil Pressure
113.0kPa MAX (16.4psi MAX) 70.0 ± 20.0kPa (10.2 ± 2.9psi) Normally Open
114-5333 Refrigerant Pressure (AC) 275 to 1750 kPa¹ (40 to 255psi) - Normally Open ²
¹ With increasing pressure the closed condition can be maintained up to 3740 kpa (542.4 psi), with decreasing pressure the
closed condition can be maintained down to 166 kpa (24.1 psi).
² Contact position at the contacts of the harness connector.
Wire Description
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
Power Circuits
Accessory Circuits (Continued)
101 RD Bat (+) 504 YL Wiper - Rear (Low)
102 BU Hd Lmp 505 BU Wiper - Rear (HI)
105 BR Key Sw 506 PU Washer - Front
109 OR Alt Output (+) Term. 507 WH Washer - Rear
112 PU Main Power Rly Output 508 PU Radio Speaker - Left
113 OR Opr Mon Panel B (+) Switched 509 WH Radio Speaker - Left (Commom)
114 GN Warning Horn (Forward) 511 BR Radio Speaker - Right
116 BR Aux Ckt 512 GN Radio Speaker - Right (Common)
118 GY Aux Ckt 513 OR A/C Compressor/Refrigerant Pressure SW
124 GN A/C 515 GY Blower Motor (HI)
128 PK Aux Ckt 516 GN Blower Motor (Medium)
129 BU Aux Ckt 517 BU Blower Motor (Low)
158 BR Aux Ckt 521 YL A/C SW To Refrigerant SW
160 PU Aux Ckt 522 WH A/C Clutch To Thermostat SW
164 WH Hydro Ctrl 592 BU DC/DC Converter Power Output
Ground Circuits
A513 PK DC/DC Converter Memory Output
200 BK Main Chassis
Lighting Circuits
201 BK Operator Monitor Return 600 BR Dash Lamp Basic
202 BK XMSN Ctrl 610 OR Head Lamp Basic
260 BK TEHC Ident Code 0 615 YL Cab Flood Lamp/Rops
261 BK TEHC Ident Code 1 663 GY Gauge Lamps - CAT Mon Sys
262 BK TEHC Ident Code 2
Control Circuits
263 BK TEHC Ident Code 3 761 GY Lift Kickout Sol SW
270 BK CAT Mon Sys Ident Code 0 762 YL Bucket Positioner Sol SW
271 BK CAT Mon Sys Ident Code 1 799 WH Sensor Power
272 BK CAT Mon Sys Ident Code 2 C744 PU Parking Brake - Sol To SW
273 BK CAT Mon Sys Ident Code 3 E707 GN Display +V
274 BK CAT Mon Sys Ident Code 4 E708 PK Display Clock
275 BK CAT Mon Sys Ident Code 5 E735 PU CAT Mon Sys Tack/Serv Mtr/Odometer Select
290 BK CAT Mon Sys Service F743 GY Impl Lift Prop Sol 2
291 BK CAT Mon Sys Clear F780 PK Parking Brake SW
Basic Machine Circuits
F793 OR Air Inlet Heater Relay
301 BU Starter No. 1 Sol F794 BU Lift SW (N.C.)
304 WH Starter Relay No. 1 Output F795 YL Lift SW (N.O.)
306 GN Starter Relay Coil F796 GY Engine Speed
308 YL Main Power Relay Coil 822 PK Forward Hydrst Sync Sol
310 PU Start Aid SW To Start Aid Sol 828 WH Hydrst Left Ster Pedal Sensor
311 WH Start Aid Sol To Temp SW 829 GN Hydrst Pedal Sensor
321 BR Bckp Alarm 830 OR Hydrst Right Ster Pedal Sensor
322 GY Warning Horn (Forward) 831 PK Hydrst Eng Speed Sensor
326 PU Key SW "C" Term. 836 WH Hydrst Throttle N/O SW
Monitoring Circuits
837 GN Hydrst Throttle N/C SW
403 GN Alternator (R) Term. 843 WH Hydrst Left Pump Forward Sol
405 GY Opr Mon Oil Press. (Low Setting) 844 GN Hydrst Left Pump Reverse Sol
410 WH Opr Mon Action Alarm 848 GY Hydrst Speed Reverse Sol
411 PK Opr Mon Master 849 YL Hydrst Right Pump Reverse Sol
419 YL Opr Mon Parking Brake 850 PU Hydrst Right Pump Forward Sol
441 OR Eng Coolant Temp Gauge 851 WH Hydrst Speed and Direction Sensor
442 GY Hyd System Temp Gauge 852 GN Hydrst Charge Press. Sensor
443 YL Power Train Temp Gauge 892 BR CAT Data Link (-)
447 PK Fuel Level Gauge 893 GN CAT Data Link (+)
C413 YL Display Data F842 BU AIH Post Heat
C414 BU Display Load 975 WH Sol Return
Accessory Circuits
E900 WH Trans Output SPD (+)
500 BR Wiper - Front (Park) E901 GN Trans Output SPD (-)
501 GN Wiper - Front (Low) E902 PU Trans Intermediate SPD (+)
502 OR Wiper - Front (HI) E903 YL Trans Intermediate SPD (-)
503 BR Wiper - Rear (Park) G939 PK Hydro Control Switch Return
K997 BU (+) V Sensor, CAT Mon Sys
A
A
3
3
4
4
5
5
6
6
8
8
9
9
10
10
11
11
12
12
14
14
15
15
13
13
16
16
B
B
C
C
D
D
E
E
1
1
2
2
17
17
18
18
19
19
20
20
21
21
22
22
23
23
23
23
24
24
25
25
26
26
27
27
28
28
29
29
30
30
31
31
7
7
Module Identifier (MID²)
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.
MAGNETIC LATCH SOLENOID - A magnetic latch solenoid is an electrical component that is
activated by electricity and held latch by a permanent magnet. It has two coils (latch and unlatch)
that make electromagnet when current flows through them. It also has an internal switch that places
the latch coil circuit open at the time the coil latches.
G939-PK
LOW SPEED
PARK
REAR
WIPER SW
3T-6655
FRONT
WIPER SW
3E-0155
502-OR
C
WASHER PUMP
HIGH SPEED
GND
BK-18
RD-14
RD-18
BN-18
WH-14
YL-14
BU-14
B+
B+
8
7
6
5
4
3
2
1
501-GN
500-BR
118-GY
200-BK-14
610-OR-14
200-BK
762-YL
200-BK-14
200-BK
761-GY
200-BK
128-PK
3
4
2
6
1
5
F795-YL
200-BK
200-BK
200-BK
762-YL
761-GY
118-GY
BUCKET
SOL.
LIFT
SOL.
A
PILOT VALVE CONTROL
NOTE E
BUCKET
FLOAT
SOL.
1
2
200-BK
2
1
506-PU
F795-YL
201-BK
200-BK
761-GY
LIFT KICKOUT
8C-9763
AA
1
2
3
GROUND
+ V
128-PK
G939-PK
B
B
B
128-PK
128-PK
761-GY
762-YL
E903-YL
E902-PU
E900-WH
E901-GN
SOL.
BK-18
OR-18
BU-18
BK-18
BU-18
OR-18
GROUND
200-BK
762-YL
200-BK
BUCKET POSITIONNER
8C-9759
SOL.
+ V
3
2
1
AA
DUAL RELIEF
SWITCH
3E-7692
B
B
AA
BK-18
C
C
BK-18
2
C
503-BR
B
H
442-GY
K997-BU
L
P W
B
447-PK
4
3
2
1
201-BK
FUEL
LEVEL
SENDER
118-0691
102-RD-12
201-BK
F842-BU
E903-YL
E902-PU
E901-GN
2
1
RPM
SENSOR
6V-2455
BK
E901-GN
E902-PU
E903-YL
WH
BK
RPM
SENSOR
6V-2455
1
2
7
6
1
2
3
RD
BK201-BK
410-WH
1
2
610-OR-14
E900-WH
F793-OR F793-OR
114-RD
410-WH
410-WH
410-WH
410-WH
200-BK-14
200-BK
200-BK
5
200-BK
615-YL
C
CAB/ROPS
FLOOD LAMP
112-9378
(RECT.)
BK
WH
200-BK
615-YL
H
H
H
H
CONDENSER
103-9527
1
2
NOTE D: 24 TO 12 VOLT CONVERTER NOT REQUIRED
WITH 24 VOLT RADIO
RADIO OPTIONS
12 VOLT RADIOS 24 VOLT RADIOS
3E-7140 FIXED U.S. 9X-6779 FIXED U.S.
3E-7141 REMOVABLE U.S. 9X-6778 REMOVABLE U.S.
3E-6107 FIXED EUROPE3E-7890 FIXED EUROPE
3E-6106 REMOVABLE EUROPE 9X-5288 REMOVABLE EUROPE
NOTE C: THE FOLLOWING ARE COMMUNICATED VIA DATA LINK
(ENGINE SPEED, SERVICE CODES)
NOTE B: NORMALLY OPEN BEFORE REFRIGERANT CHARGE
XX
W
W
R
R
Q
Q
V
V
U
U
T
T
S
S
F
M
L
D
D
D
D
D
D
D
D
D
B
D
D
D
D
D
D
D
D
D
D
D
D
D
C
C
C
C
C
C
C
C
C
C
C
A
4
C
D
A
A
A
A
A
A
A
A
A
A A
A
A
A
A
A
A
A
B
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A A
A
A
A
A
A AA
A
A
A
A
A
A
RD-4
107-9652
BK-2
A
160-PU-4
TO ENGINE
A
E
E
E
E
E
E
E
E
GND STRAP-4
E
A
6
BK-00
301-BU-10
200-BK-10
326-PU
405-GY
201-BK
521-YL-14
522-WH
831-PK
F796-GY
443-YL
615-YL
RD-00
RD-00
828-WH
829-GN
830-OR
615-YL
8
7
MOTOR
106-2721
200-BK-14
FRT FRAME
GND BOSS
A.I.H
RELAY
125-1302
975-WH
F793-OR
129-RD
105-RD
102-RD-12
114-RD
615-YL
129-RD
5
615-YL
200-BK
CAB/ROPS
FLOOD LAMP
112-9378
(RECT.)
105-RD
200-BK
113-OR
2
1
200-BK
3
PLATFORM
GND BOSS
109-RD-4
304-WH-8
308-YL
101-RD-4
118-GY-14
200-BK-8
116-BR-14
158-BR-14
124-GN-14
200-BK
E735-PU
306-GN
BK
200-BK-14
E735-PU
290-BK
291-BK
164-WH
8
F743-GY
7
321-BR
E735-PU
SERVICE SW.
9D-3721
CLEAR SW.
9D-3721
2 3
F793-OR
F795-YL
615-YL
202-BK-14
201-BK-14
202-BK-14
SERVICE TOOL
CONNECTOR
8T-8736
HGFCD EAB
113-OR
892-BR
893-GN
201-BK
201-BK-14
113-OR
201-BK-14
410-WH
200-BK
201-BK
761-GY
6
4
201-BK
1
2
8
12V BATTERY
3T-5760 STD
9X-3404 ATCH
9
G939-PK
522-WH
C
ACTION
ALARM
3E-6328
2
1
2
1
615-YL
410-WH
4
3
5
1
2
WH
128-PK
BK
762-YL
200-BK
Y
Y
P
P
N
N
D
J
G
1
2
522-WH
1
200-BK
200-BK-14
128-PK
BK-14
BK-14
WH/RD-14
WH/RD-14
3E6387
3E6386
OPERATOR STATION
200-BK-14
521-YL-14
158-BR-14
106-2721
MOTOR
RESISTOR
9G-1950
RADIO
ANTENNA
149-1928
THERMOSTAT
3E-5464
MOTOR
RELAY AS.
3E-5239
517-BU-14
516-GN-14
515-GY-14
200-BK-14
522-WH-14
113-OR
°T
200-BK-10
MOTOR
A/C
BLOWER
SWITCH
6P-3236
515-GY-14
516-GN-14
517-BU-14
521-YL-14
124-GN-14
3
4
5
2
1
2
RIGHT
SPEAKER
6T-7695
512-GN
511-BR
447-PK 447-PK
A
Z
B
C
A
200-BK
DOME
LAMP
3E-6389
BK
WH
RD
102-RD
B
D
3E6287
(HARN.CONN.)
200-BK-14
200-BK
4
6
3
1
2
5
E902-PU
200-BK
SUPRESSOR
ARC DIODE
106-8704
615-YL
200-BK
G939-PK
G939-PK
2
CONVERTER 12/24V
119-1733
12V RADIO
EUROPE-3E6106
U.S-3E7141
NOTE D
A513-PK
508-PU
509-WH
LEFT
SPEAKER
6T-7695
A513-PK
GROUND
12V OUTPUT
12V MEMORY
GND INPUT
24V IMPUT
24V MEMORY
200-BK
200-BK
118-GY
102-RD
118-GY
511-BR
512-GN
508-PU
509-WH
200-BK
GN
GY
PU
BU
PK
BK
RD
ANTENNA
522-WH-14
513-OR-14
RIGHT SPKR
GROUND
LEFT SPKR
12V MEMORY
118-GY
RIGHT SPKR
12V INPUT
F
592-BU592-BU
2
1
F794-BU
LEFT SPKR
4
2
1
3
5
6
7
8
502-OR
500-BR
118-GY
501-GN
REAR
WIPER
9X-5601
505-BU
GN
GY
BR
OR
4
2
3
1
L
MOTOR
°
118-GY
118-GY
118-GY
118-GY
503-BR
118-GY
504-YL
T
GN
GY
BR
OR
3
12
11
10
9
762-YL
200-BK-14
610-OR-14
610-OR-14
200-BK-14
128-PK
761-GY
1
2
B
F795-YL
G939-PK
E903-YL
5
A
B
1
2
C
E901-GN
+ V
GROUND
HYDRAULIC OIL
TEMP. SENSOR
152-0649
K997-BU
201-BK
442-GY
TO ENGINE
975-WH
F743-GY
SIGNAL
OR-18
BK-18
H
WH-18
E900-WH
113-OR
975-WH
F793-OR
200-BK
6
4
6
H
5
L
4
610-OR-14
3
164-WH-14
A
2
1
522-WH
F796-GY
443-YL
105-RD
443-YL
405-GY
403-GN
2
1
118-GY-14
975-WH
1
2
2
2
A
POS NEG
12V BATTERY
3T-5760 STD
9X-3404 ATCH
M
975-WH-14
G939-PK
113-OR
C
2
°
1
T
1
975-WH
102-RD
118-GY-14
507-WH
A
80A
ALT
BREAKER
9S-4693
B
506-PU
321-BR
321-BR
410-WH
831-PK
1
WH
BK
2
1
G939-PK
405-GY
311-WH
200-BK
TWO LEVEL LIFT
RELIEF SOLENOID
3E-8574
326-PU
200-BK-14
START AID
SOLENOID
3E-6332
BK-18
799-WH
403-GN
441-OR
A/C CLUTCH COIL ASSY
101-1759
A/C HI-LO SW
114-5333
NOTE B
513-OR-14
3
311-WH
301-BU-10
310-PU
2
1
2
1
405-GY
201-BK
BK-18
975-WH
610-OR-14
ENGINE
OIL SW
3E-7692
BK-18
BK-18
2
1
443-YL
XMSN OIL
TEMP SENDER
4W-9972
STARTER
104-7040
°
TO
ENGINE
ALTERNATOR
132-2156
200-BK-4
403-GN
109-RD-4
FLOOD LAMP
135-5549
DISCONNECT
SW
7N-0718
FLOOD LAMP
135-5549
BK-00
200-BK-10
101-RD-4
BK-00
FUSE 10A : 3K-8782
FUSE 15A : 8N-8948
FUSE 20A : 8N-0456
200-BK-14
BACKUP
ALARM
123-6449
BK
BK
7
START AID
TEMP. SW.
3E-6449
201-BK
799-WH
G939-PK
521-YL-14
304-WH-8
NEGPOS
610-OR-14
321-BR
RD-00
MOTOR
BATMTR
SG
200-BK
LEFT FRAME
GROUND BOSS
ENGINE
SHUTDOWN
SOLENOID
8C-3663
301-BU-10
200-BK-10
326-PU
441-OR
8
ENGINE
SPEED
SENDER
6V-2455
BK
WH
F796-GY
521-YL-14
522-WH-14
B
COOLANT TEMP. SENSOR
152-0649
310-PU
+
R
ALT
831-PK
109-RD-4
A
B
LEFT FRANE
GROUND BOSS
C
+ V
GROUND
T
SIGNAL
OR-18
BK-18
200-BK
200-BK
308-YL
WH-18
1
522-WH
102-RD-12
521-YL-14
BK
E735-PU
109-RD-4
304-WH-8
101-RD-4
128-PK
WH
WH
410-WH
A
322-GY
G939-PK
B
200-BK
200-BK
4
5
3
326-PU
128-PK
2
506-PU
507-WH
1
6
521-YL-14
410-WH
615-YL
158-BR-14
118-GY-14
102-RD
G939-PK
4
6
3
1
2
5
507-WH
E735-PU
291-BK
290-BK
506-PU
852-GN
1
848-GY
7
8
K997-BU
822-PK
1
2
G939-PK
C744-PU
N/C
N/O
COM
G939-PK
(SHOWN IN HIGH
IDLE POSITION)
GOVERNOR
LEVER
SWITCH
6G-4195
(SHOWN IN
LOCKED
POSITION)
164-WH
G939-PK
851-WH
837-GN
836-WH
SPEED/DIRECTION
SENSOR
147-1680
G939-PK
419-YL
322-GY
114-RD
FORWARD HORN SW.
3T-2357
A
B
C
MOTOR
+ V
GROUND
°T
200-BK
291-BK
10
12
11
E900-WH
E901-GN
FRONT
WIPER
146-6149
H
E903-YL
STRAP
7X-6315
SIGNAL
RD-18
975-WH
BK-18
975-WH
WH-18
2
3
1
843-WH
G939-PK
COM
N/O
851-WH
830-OR
829-GN
828-WH
116-BR-14
663-GY
164-WH-14
201-BK
200-BK-8
200-BK
200-BK
1
200-BK
200-BK-14
A
1
2
164-WH
164-WH
164-WH
102-RD-12
B
600-BR
118-GY
610-OR-14
200-BK
5
2
1
3
6
4
200-BK
114-RD
164-WH-14
201-BK
201-BK
113-OR
600-BR
2
201-BK
DIMMING
RESISTOR
116-6203
200-BK
100-5895
201-BK
E708-PK
E707-GN
C414-BU
C413-YL
BU
BK
GN
OR
YL
HARNESS CODE
MODULE LOAD
CLOCK
+V DISPLAY
GROUND
DATA
WH
SWITCH
112-6169
A
B
2
3
200-BK
LAMP
7N-5876
308-YL
F842-BU
200-BK
200-BK
615-YL
200-BK
F842-BU
600-BR
2
200-BK
G939-PK
200-BK
G939-PK
CAB ROOF
GND BOSS
DASH GND BOSS
610-OR-14
G939-PK
G939-PK
600-BR
200-BK
663-GY
600-BR
6
4
3
1
5
2
B
A
600-BR
E735-PU
201-BK
200-BK-14
6
4
3
1
5
2
D
C
B
LAMP SW
3E-2210
A
102-RD-12
OPERATOR SW./
START AID SW.
123-6361
101-0205
(HARN.CONN.)
200-BK
600-BR
308-YL
200-BK
36
310-PU
E735-PU
RD-00
975-WH
RD-00
N/C
XMSN CONTROL
BRAKE SW.
6G-4195
G939-PK
610-OR-14
2
A
1
F743-GY
WH
BK
610-OR-14
506-PU
610-OR-14610-OR-14
1
2
310-PU
615-YL
F842-BU
310-PU
105-RD
129-RD
975-WH
128-PK
1
F
NOTE E: PILOT VALVE OPTIONS
146-5020 2 LEVERS-2 WAYS
146-5021 3 LEVERS-3 WAYS
146-5022 JOYSTICK-2 WAYS
146-5023 JOYSTICK-3 WAYS
200-BK-14
837-GN
128-PK
164-WH
128-PK
G939-PK
G939-PK-14
D
200-BK
322-GY
RUN LAMP
133-6336
200-BK-14
610-OR-14
FORWARD
HORN
7T-0969
610-OR-14
200-BK-14
RUN LAMP
133-6336
2
200-BK
306-GN
200-BK
NOTE A: THE FOLLOWING WIRE PAIRS MUST BE TWISTED AT
LEAST 1 TURN/25 MILLIMETERS (892-BR/893-GN)
(831-PK/F796-GY),(E900-WH/E901-GN),
(E902-PU/E903-YL)
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF
AND XMSN SHIFTER IN NEUTRAL
THIS SCHEMATIC IS FOR THE 953C (145-6845)
521-YL-14
124-GN-14
164-WH
164-WH
200-BK
610-OR-14
REAR
WASHER
7T-8890
FRONT
WASHER
7T-8890
200-BK
MOTOR MOTOR
3
G939-PK
G939-PK
8
1
2
7
6
5
4
3
9
B
A
C
836-WH
419-YL
615-YL
F780-PK
1
SENSOR/SPEED
CAL SW
9G-0011
306-GN
201-BK
201-BK
893-GN
892-BR
201-BK
3
200-BK
201-BK
2
200-BK
129-RD
CIGAR LIGHTER
9W-0335
291-BK
610-OR-14
844-GN
164-WH
21
G939-PK
G939-PK-14
BASE
3T-0304
CAT DATA LINK +
CAT DATA LINK -
ACTION LAMP
7N-1996
E735-PU OPERATOR SW INPUT
100-5778
NOTE A
411-PK
201-BK
892-BR
893-GN
411-PK
410-WH
113-OR
403-GN
+8V SENSOR SUPPLY
290-BK
291-BK
270-BK
271-BK
272-BK
273-BK
XMSN OIL TEMP.
274-BK
275-BK
FUEL LEVEL SENDER
ALTERNATOR
+ BATTERY
GROUND
ACTION LAMP
ACTION ALARM
CLUSTER +V
MODULE LOAD
13
1
39
4
29
28
40
32
20
24
9
10
19
25
34
15
35
443-YL
E708-PK
E707-GN
C414-BU
C413-YL
MODULE CLOCK
447-PK
442-GY HYD OIL TEMP.
405-GY ENG. OIL PRESS. SW.
30
27
201-BK
11
38
37
26
5
14
2
23 SERVICE
CLEAR
HARNESS CODE 1
HARNESS CODE 2
HARNESS CODE 031
HARNESS CODE 3
HARNESS CODE 4
HARNESS CODE 5
MODULE DATA
33
18
3
12
22
16
17
6
F743-GY
610-OR-14
E902-PU
F780-PK
975-WH
321-BR
K997-BU
447-PK
442-GY
RIGHT STEERING
PEDAL SENSOR
147-1680
LEFT STEERING
PEDAL SENSOR
147-1680
CENTER PEDAL
SENSOR
147-1680
829-GN
828-WH
G939-PK
G939-PK
830-OR
164-WH
164-WH
164-WH
G939-PK
A
B
C
GROUND
+V
SIGNAL
RD-18
BK-18
WH-18
A
B
C
GROUND
+V
SIGNAL
RD-18
BK-18
WH-18
A
B
C
GROUND
+V
SIGNAL
RD-18
BK-18
WH-18
K
610-OR-14
200-BK-14
849-YL
C744-PU
112-PU-14
KICKOUT
10A
A
112-PU-14
101-RD-4
112-PU-14
112-PU-14
11
112-PU-14
12
101-RD-14
1
2
101-RD-14
112-PU-14
E900-WH
200-BK-14
2
1
101-RD-12
101-RD-14
112-PU-14
RELAY/FUSE PANEL
113-OR
164-WH-14
116-BR-14
129-RD
10A
15A
10A
10A
10A
20A
10A
304-WH-8
WIPERS/RADIO
200-BK
306-GN
109-RD-4
109-RD-4
109-RD
118-GY-14
124-GN-1420A
FANS
A/C
200-BK
LIGHTS
158-BR-14
STRAP
117-7030
308-YL
SYSTEM MONITORING
FRONT HORN
102-RD-12
KEY FUSE
TEHC
105-RD
START
RELAY
125-1302
114-RD
MAIN
RELAY
101-7740
113-OR
AUXILIARY
CIGAR LIGHTER
20A
200-BK-14
UNUSED
164-WH-14
10A
164-WH-14
850-PU
CHARGE
PRESSURE
SENSOR
147-7318
PARK BRAKE
SOLENOID
116-4152
975-WH
RIGHT REV
SOLENOID
130-3310
RIGHT FWD
SOLENOID
130-3310
SYNC
SOLENOID
130-6913
OVERRIDE
SOLENOID
130-3310
LEFT REV
SOLENOID
130-3310
LEFT FWD
SOLENOID
130-3310
C744-PU
2
1
2
1
849-YL
2
1
975-WH-14
852-GN
164-WH
G939-PK
844-GN
843-WH
822-PK
848-GY
850-PU
849-YL
850-PU
975-WH
1
2
975-WH
844-GN
975-WH
843-WH
975-WH
164-WH
852-GN
G939-PK
10
848-GY
975-WH 2
1
1
2
975-WH
822-PK
A
B
C
+ V
GROUND
SIGNAL
YL-18
4
6
8
3
1
G939-PK5
6
3
19
24
34
29
4
14
15
31
18
35
8
7
25
36
37
40
2
HARNESS
CODE
152-7381
F794-BU
F795-YL
C744-PU
10
30
13
F743-GY
UNUSED
5
UNUSED
UNUSED
BRAKE VALVE SOL.
SPEED/DIRECT. SNSR
17
39
16
9
33
23
22
32
11
UNUSED
UNUSED
17
1
843-WH
850-PU
AIH SW. (N/O)
UNUSED
LEFT TRACK SPD -
UNUSED
UNUSED
UNUSED
UNUSED
LEFT PEDAL SENSOR
UNUSED
GOVERNOR SW. (N/O)
UNUSED6
CHARGE PRESS. SNSR
2 LEVEL LIFT SOL.
UNUSED
OVERRIDE SOL.
UNUSED
RIGHT PEDAL SENSOR
CENTER PEDAL SENSOR
UNUSED
BACKUP ALARM
UNUSED
UNUSED
263-BK
262-BK
261-BK
260-BK
2
G939-PK-14
836-WH
837-GN
975-WH-14
844-GN
849-YL
202-BK-14
164-WH-14
892-BR
893-GN
SYNCH. SOL.
UNUSED
7
27
UNUSED21
12
38
26
20
28
40
39
32
UNUSED
822-PK
828-WH
829-GN
830-OR
851-WH
852-GN
COOLANT TEMP.SENSOR
4
3
2
1
28
26
LEFT TRACK SPD +
IDENT. CODE 0
IDENT. CODE 3
UNUSED
27
UNUSED
UNUSED
IDENT. CODE 1
GOVERNOR SW. (N/C)
UNUSED
12
IDENT. CODE 2
UNUSED
2 LEV.LIFT SW.(N/O)
142-3363
NOTE A
RIGHT FORWARD SOL.
UNUSED
SWITCH RETURN
UNUSED
UNUSED
UNUSED
UNUSED
UNUSED
2 LEV.LIFT SW.(N/C)
1
UNUSED
UNUSED
11
33
22
35
34
29
16
6
RIGHT TRACK SPD +
UNUSED
AIH RELAY
ENGINE SPEED +
UNUSED
13
30
10
14
25
21
UNUSED
RIGHT REVERSE SOL.
LEFT FORWARD SOL.
37
36
31
19
7
DATA LINK -
DATA LINK +
UNUSED
SOLENOID RETURN
PARK.BRAKE SW.(N/O)
PARK.BRAKE SW.(N/C)
8
2
38
18
5
15
23
4
GROUND
+ BATTERY
LEFT REVERSE SOL.
38
RIGHT TRACK SPD -
3
419-YL
F780-PK
5
441-OR
799-WH
9
UNUSED
20
+8V SENSOR SUPPLY
F793-OR
F842-BU
OR-18
GN-18
308-YL
KEY
START
SWITCH
9G-7641
117-4867
275-BK
831-PK
321-BR
274-BK
105-RD
326-PU
306-GN
R
C
S
B
273-BK
272-BK
OFF
271-BK
848-GY
WH
610-OR-14
610-OR-14
270-BK
201-BK
ON
ST
610-OR-14
308-YL
200-BK
200-BK
615-YL
200-BK
610-OR-14
200-BK-14
BK
REAR FRAME
GND BOSS
200-BK-14
201-BK
B
UNLESS OTHERWISE SPECIFIED ALL WIRE IS 18 GAUGE
CATERPILLAR MONITORING SYSTEM
EHC
CONTROL
AIR INLET HEATER
CATERPILLAR MONITORING SYSTEM
HARNESS CODE CONNECTOR
F794-BU
GAUGE CLUSTER
HEATER (A.I.H.)
AIR INLET
CONN 1
CONN 2
CONN 3
CONN 4
CONN 5
CONN 6
CONN 8
WITHOUT OPTIONAL ATTACHMENTS
CONN 8
CONN 7
CONN 10
CONN 9
CONN 13
CONN 11
CONN 12
CONN 14
CONN 15
CONN 16
CONN 17
H832-YL
H835-GY
RH PILOT PRESS SNSR
LH PILOT PRESS SNSR
799-WH
441-OR
831-PK
799-WH
799-WH
0939-PK
0939-PK
H832-YL
H835-GY
201-BK-14
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#
ABBREV COLOR
RD RED
WH WHITE
OR ORANGE
YL YELLOW
PK PINK
BK BLACK
GY GRAY
PU PURPLE
BR BROWN
GN GREEN
BU BLUE
SYMBOLS
IDENT PART NO. CHG NOTE
A 168-6252 02 ---
B 143-8499 02 ---
C 193-3572 00 ---
D 146-2575 02 ---
E 176-3371 00 ---
F 149-2478 00 ATCH
G 123-8329 04 ATCH
H 120-6564 01 ---
Z 126-2336 01 ATCH
AA 149-1124 00 ---
J 117-4867 01 ---
K 152-7381 00 ---
L 117-7031 01 ---
M 117-7032 01 ---
N 115-1833 00 ---
P 115-1834 03 ---
Q 8Y-9603 01
R 7P-6682 01
S 111-8867 01
T 150-8252 00 ---
U 150-8251 00 ---
V 146-7240 00 ---
W 8X-5804 01 ---
X 117-7030 00 ---
Y 108-5747 00 ---
HARNESS AS.
WIRE AS.
SRTAP
CABLE AS.
201-BK-14
D
C
B
A A
B
C
D
8 7 6 5 4 3 2 1
25678
1
34
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.
WASHER/WIPER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
ELECTRONIC HYDROSTATIC CONTROL.
START AID CIRCUIT.
ALL DASHED LINES ARE ATTACHMENTS.
0939-pk
799-WH
H832-YL
199-9702
A
B
C
WH-18
D
A
B
C
CONN 2
G939-PK
799-WH
H835-GY
OR-18
199-9702
A
B
C
BK-18
D
A
B
C
CONN 2
WH-18
OR-18
BK-18
RH_PILOT_PRESS_SNSR
LH_PILOT_PRESS_SNSR
+ BATTERY
GROUND
SIGNAL
+ BATTERY
GROUND
SIGNAL