953C TRACK-TYPE LOADER (2ZN1-1749) ELECTRICAL SCHEMATIC

SENR8412-02
December 2001
953C Track Loader
Electrical System
MACHINE:
2ZN1-1749
Off Machine Switch Specification
Part No. Function Actuate Deactuate Contact Position
3E-6449 Start Aid Temperature
38 ± 3.0°C
(100.4 ± 5.4°F)
27.0°C
(80.6°F)
Normally Closed
3E-7692 Engine Oil Press
113.0kPa MAX
(16.4psi MAX)
70.0 ± 20.0kPa
(10.2 ± 2.9psi)
Normally Open
114-5333 Refrigerant Pressure (AC)
275 to 1750kPa¹
(40 to 255psi)
- Normally Open²
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 (25psi).
² Contact position at the contacts of the harness connector.
Component Identifiers (CID) List
CID No. Component
Caterpillar Monitoring System (MID No. 30)
096 Fuel Level Sensor
110 Engine Coolant Temperature 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
Electronic Hydrostatic Control (MID No. 79)
070 Parking Brake Switch
110 Engine Coolant Temperature 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
Module Identifiers (MID)
MID No. Module
30 Caterpillar Monitoring System
79 Electronic Hydrostatic Control
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 - Center Pedal B-2 15
Alternator D-8 2 Sensor - Charge Pressure C-5 16
Batteries D-8 3 Sensor - Coolant Temp C-8 2
Breaker - Alt A-6 E Sensor - Hydraulic Oil Temp C-1 17
Caterpillar Monitoring System A-2 A Sensor - Left Steering Pedal B-2 15
Control - Electronic Hydrostatic A-5 E Sensor - Right Steering Pedal B-2 15
Converter B-2 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-1 6 Solenoid - Right Forward C-5 16
Ground - Left Frame C-7 3 Solenoid - Right Rev C-5 16
Ground - Left Frame D-7 3 Solenoid - Start Aid D-7 21
Ground - Platform D-2 6 Solenoid - Sync C-5 22
Ground - Rear Frame D-7 3 Solenoid - Two Level Lift Relief C-1 17
Heater - Air Inlet D-7 7 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 D-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-2 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-2 D Switch - Operator/Start Aid C-2 A
Relay - Air Inlet Heater D-7 7 Switch - Rear Wiper C-4 25
Relay - Main A-7 E Switch - Sensor/Speed Cal A-4 23
Relay - Start A-6 E Switch - Service A-4 23
Relay Assembly B-5 9 Switch - Start Aid Temp C-8 2
Resistor - Blower Motor B-5 8 Switch - Thermostat B-S 8
Resistor - Dimming D-2 A Switch - Tilt Lever A-3 B
Sender - Engine Speed B-7 5 Switch - Transmission Control Brake D-2 C
Sender - Fuel Level D-1 13 Switches - Implement Hold Position A-4 26
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 Caterpillar Monitoring
System Harness Code
C-2 A
CONN 2 D-4 27
CONN 3 B-4 8
CONN 4 B-5 9
CONN 5 EHC Harness Code A-5 E
CONN 6 Service Tool A-5 E
CONN 7 C-5 16
CONN 8 B-6 E
CONN 9 C-7 19
CONN 10 C-7 19
CONN 11 C-7 19
CONN 12 C-7 19
CONN 13 C-7 19
CONN 14 D-8 1
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.
Failure Mode Identifiers (FMI) List
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.
Related Electrical Service Manuals
Form Number
Alternator: (107-7977) SENR4757
Caterpillar Monitoring System SEN R6717
Electronic Hydrostatic
Transmission Control
SENR8314
Starting Motor: (104-7040)
Consist: 6V-5720
Consist: 106-8557
SENR3581
SENR3859
Title
Mode Of Operation Mode Number
Normal 0
Harness Code 1
Parameter Display 2
Service 3
Tattletale 4
Electronic Hydrostatic Control 5
Monitoring System Modes
Resistor, Sender and Solenoid Specifications
Part No. Component Description Resistance (Ohms)¹
9G-1950 Resistor - A/C Motor Overall 2.0 ± .1; Tap 1.0 ± .05
116-6203 Resistor - Dimming 20 ± 1
101-1759 Solenoid - A/C Clutch 14.4 ± 0.6
8C-3663
Solenoid - Engine Shutdown
Start (Latch) Coil
Stop (Unlatch) Coil
1.55 ± 0.15
10.3 ± 1.03
130-3310
Solenoid - Left Forward
Left Reverse
Right Forward
Right Reverse
Override
7.75 ± 1.00
116-4152 Solenoid - Park Brake 34.3 ± 1.7
3E-6332 Solenoid - Start Aid 6.0
130-6913 Solenoid - Sync 33.6
3E-8574 Solenoid - Two Level Lift Relief 34.3 ± 1.7
¹ At room temperature unless otherwise noted.
T
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
Normally open switch that is closed due to an applied condition, and will open again with a
specific decrease in that condition.
Normally closed switch that will open with an increase of a specific condition.
Normally closed switch that is open due to an applied condition, and will close again
with a specific decrease in that condition.
The circle indicates that the component has screw terminals and a wire can be disconnected
from it.
No circle indicates that the wire cannot be disconnected from the component.
This indicates that the component has a wire connected to it that is connected to ground.
This indicates that the component does not have a wire connected to ground. It is grounded
by being fastened to the machine.
Electrical Schematic Symbols And Definitions
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
A AA
2
A AA
1
2
325-PK-14
C
A
325-PK-14
200-BK-14
T
FUSE - A component in an electrical circuit that will open the circuit if too much current flows
through it.
REED SWITCH - A switch whose contacts are controlled by a magnet. A magnet closes the
contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.
SENDER - A component that is used with a temperature or pressure gauge. The sender
measures the temperature or pressure. Its resistance changes to give an indication to the
gauge of the temperature or pressure.
RELAY (Magnetic Switch) - A relay is an electrical component that is activated by electricity.
It has a coil that makes an electromagnet when current flows through it. The electromagnet
can open or close the switch part of the relay.
CIRCUIT BREAKER (C/B) - A component in an electrical circuit that will open the circuit if too
much current flows through it. This does not destroy the circuit breaker and it can be reset to
become part of the circuit again.
SOLENOID - A solenoid is an electrical component that is activated by electricity. It has a coil
that makes an electromagnet when current flows through it. The electromagnet can open or
close a valve or move a piece of metal that can do work.
Harness And Wire Electrical Schematic Symbols
Socket
Pin
Pin or Socket
Number
Wire, Cable, or Harness
Assembly Identification
Single Wire
Connector
Circuit Number
Identification
Wire
Gauge
Wire
Color
Plug
Receptacle
9X-1123
Component
Part Number
Electrical Schematic Symbols And Definitions
1
1
1
2
2
Typical representation of a
Sure-Seal connector. The
plugand receptacle contain
both pins and sockets.
Typical representation of a
Deutsch connector. The
plug contains all sockets
and the receptacle contains
all pins.
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.
A
3
4
5
6
8
9
10
11
12
14
15
13
16
B
C
D
E
1
2
17
18
18
19
20
21
22
23
23
24
25
26
7
A
3
4
5
6
8
9
10
11
12
14
15
13
16
B
C
D
E
1
2
17
18
19
20
21
22
23
23
24
25
26
7
MACHINE HARNESS CONNECTOR AND COMPONENT LOCATIONS
681 Parking Brake Solenoid
©
2001 Caterpillar
All Rights Reserved
Printed in U.S.A.
1
1
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
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.
ENGINE SHUTDOWN CONTROL CIRCUIT.
START AID CIRCUIT.
ELECTRONIC HYDROSTATIC
TRANSMISSION CONTROL CIRCUIT.
ALL DASHED LINES ARE ATTACHMENTS.
E903-YL
E902-PU
E900-WH
E901-GN
615-YL
102-RD-12
102-RD-12
102-RD-12
200-BK-14
102-RD-12
102-RD-12
615-YL
102-RD-12
102-RD-12
102-RD-12102-RD-12
F842-BU
E903-YL
E902-PU
E901-GN
2
1
RPM
SENSOR
6V-2455
BK
WH
E901-GN
E900-WH
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
610-OR-14
507-WH
506-PU
410-WH
610-OR-14
507-WH
506-PU
410-WH
610-OR-14
410-WH
506-PU
507-WH
E900-WH
975-WH-14
E902-PU
F793-OR F793-OR
C744-PU
851-WH
848-GY
852-GN
822-PK
C744-PU
822-PK
848-GY
852-GN
F793-OR
822-PK
C744-PU
848-GY
852-GN
410-WH
447-PK
K997-BU
442-GY
G939-PK
442-GY
G939-PK
K997-BU
851-WH
447-PK
410-WH
447-PK
K997-BU
442-GY
G939-PK
442-GY
410-WH
K997-BU
851-WH
447-PK
410-WH
202-BK-14
200-BK-14
201-BK-14
202-BK-14
200-BK-14
201-BK-14
202-BK-14
200-BK
200-BK
200-BK
200-BK
308-YL
200-BK
200-BK
308-YL
200-BK
200-BK
308-YL
200-BK
200-BK
308-YL
308-YL
200-BK
200-BK
5
610-OR-14
200-BK
615-YL
200-BK-14
C
CAB/ROPS
FLOOD LAMP
112-9378
(RECT.)
BK
WH
200-BK
615-YL
H
H
H
H
CONDENSER
103-9527
120-6564
1
2
NOTE D: 24 TO 12 VOLT CONVERTER NOT REQUIRED
WITH 24 VOLT RADIO
RADIO OPTIONS
12 VOLT RADIOS
3E-7140 FIXED U.S.
3E-7141 REMOVEABLE U.S.
3E-6107 FIXED EUROPE
3E-6106 REMOVEABLE EUROPE
D
C
B
A
12345678
A
B
C
8 7 6 5 4 3 2 1
D
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
T
S
F
F
F
117-7030
6Y-6584
R
Q
STRAP
124-0377
P
7P-6682
M
L
124-0376
124-0375
124-0378
N
M
L
CABLE AS.
117-4868
117-4867
117-7032
117-7031
K
J
H
G
WIRE AS.
ATCH8Y-9217
HARNESS AS.
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
CC
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
A
8Y-9603
4
C
D
A
A
A
A
F
A
A
A
A
A
A
A A
A
A
A
A
A
B
A
A
B
A
A
A
A
A
B
A
A
B
B
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
A
RD-4
AIR INLET
HEATER
107-9652
BK-2
A
160-PU-4
TO ENGINE
A
E
E
E
E
E
E
E
E
GND STRAP-4
E
A
130-1385
116-3687
116-6926
129-6617
E
D
6
BK-00
G939-PK
C
B
129-7519
301-BU-10
200-BK-10
326-PU
405-GY
201-BK
521-YL-14
522-WH
831-PK
G939-PK
443-YL
201-BK-14
G939-PK
975-WH-14
E902-PU
615-YL
RD-00
RD-00
828-WH
829-GN
830-OR
615-YL
8
7
MOTOR
106-2721
201-BK
200-BK-14
200-BK-14
FRT FRAME
GND BOSS
200-BK-14
RELAY
3E-0075
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
113-OR
2
615-YL
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
306-GN
200-BK
E735-PU
307-OR
E735-PU
290-BK
291-BK
164-WH
8
F743-GY
7
321-BR
307-OR
E735-PU
SERVICE SW.
9D-3721
CLEAR SW.
9D-3721
F794-BU
G939-PK
2 3
TILT
LEVER SW.
6G-4195
118-GY
118-GY
202-BK-14
201-BK-14
102-RD-12
200-BK-14
201-BK-14
202-BK-14
SERVICE TOOL
CONNECTOR
8T-8736
H
G
F
C
D
E
A
B
113-OR
892-BR
893-GN
201-BK
201-BK-14
200-BK-14
113-OR
201-BK-14
202-BK-14
200-BK
308-YL
201-BK
6
4
201-BK
1
2
8
12V BATTERY
3T-5760 STD
9X-3404 ATCH
9
522-WH
ACTION
ALARM
3E-6328
2
2
1
2
1
615-YL
410-WH
4
3
5
1
2
124-GN-14
851-WH
108-5747
200-BK
Y
Y
Y
X
W
V
U
P
P
N
N
D
115-1834
115-1833
J
G
123-8329
1
2
522-WH
1
200-BK
200-BK-14
3
1
521-YL-14
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
3A-8746
THERMOSTAT
3E-5464
MOTOR
RELAY AS.
3E-5239
306-GN
517-BU-14
516-GN-14
515-GY-14
200-BK-14
522-WH-14
307-OR
T
200-BK-10
MOTOR
A
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
ATCH
A
-01126-2336Z
Z
B
C
A
200-BK
DOME
LAMP
3E-6389
BK
WH
RD
102-RD
B
D
(HARN.CONN.)
200-BK-14
200-BK
615-YL
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
E903-YL
RIGHT SPKR
GROUND
LEFT SPKR
12V MEMORY
118-GY
RIGHT SPKR
12V INPUT 592-BU592-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
FRONT
WIPER SW
3T-6655
REAR
WIPER SW
3T-6655
B
WP
L
H
B
GN
GY
BR
OR
4
2
3
1
L
MOTOR
506-PU
500-BR
501-GN
502-OR
118-GY
118-GY
505-BU
504-YL
503-BR
507-WH
B
H
L
P W
B
503-BR
118-GY
504-YL
T
GN
GY
BR
OR
4
12
11
10
9
610-OR-14
200-BK-14
610-OR-14
-00
610-OR-14
200-BK-14
-00
-00
-00
-00
1
E903-YL
2
1
2
-00
-00
-01
-01
-01
E901-GN
TO ENGINE
H
E900-WH
893-GN
892-BR
113-OR
2
2
1
975-WH
F793-OR
200-BK
3
1
6
H
5
L
4
610-OR-14
3
164-WH-14
2
1
522-WH
G939-PK
443-YL
105-RD
443-YL
405-GY
403-GN
2
1
-00
-01
-01
-01
-01
-00
-01
-00
-02
-01
975-WH
1
2
2
2
A
POS NEG
12V BATTERY
3T-5760 STD
9X-3404 ATCH
M
310-PU
975-WH-14
G939-PK
113-OR
C
1
T
1
975-WH
102-RD
118-GY
507-WH
A
80A
ALT
BREAKER
9S-4693
B
506-PU
321-BR
321-BR
410-WH
831-PK
1
G939-PK
405-GY
311-WH
200-BK
326-PU
200-BK-14
610-OR-14
200-BK-14
START AID
SOLENOID
3E-6332
BK-18
799-WH
403-GN
441-OR
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
107-7977
200-BK-4
403-GN
109-RD-4
FLOOD LAMP
106-8964
DISCONNECT
SW
7N-0718
FLOOD LAMP
106-8964
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
3T-1815
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
200-BK-14
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
G939-PK
521-YL-14
522-WH-14
B
COOLANT TEMP. SENSOR
118-7226
310-PU
+
R
ALT
831-PK
200-BK-14
610-OR-14
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
522-WH
102-RD-12
521-YL-14
E735-PU
109-RD-4
304-WH-8
101-RD-4
310-PU
102-RD-12
COM
410-WH
102-RD-12
A
G939-PK
G939-PK
200-BK
851-WH
326-PU
N/O
N/C
506-PU
507-WH
615-YL
615-YL
851-WH
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
9X-5592
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
3T-7065
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
200-BK-14
102-RD-12
102-RD-12
B
200-BK-14
600-BR
118-GY
200-BK
200-BK
200-BK
5
2
1
3
6
4
200-BK
114-RD
164-WH-14
201-BK
201-BK
113-OR
600-BR
200-BK-14
201-BK
DIMMING
RESISTOR
116-6203
200-BK
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
200-BK
200-BK-14
SWITCH
112-6169
A
B
2
3
102-RD-12
200-BK
600-BR
LAMP
7N-5876
308-YL
F842-BU
200-BK
200-BK
200-BK
200-BK
200-BK
F842-BU
600-BR
2
200-BK
-01
G939-PK
200-BK
-01
G939-PK
-00
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
6
4
3
1
5
2
D
C
B
LAMP SW
3E-2210
A
102-RD-12
OPERATOR SW./
START AID SW.
123-6361
(HARN.CONN.)
200-BK
600-BR
308-YL
200-BK
36
310-PU
E735-PU
975-WH
F743-GY
442-GY
N/C
XMSN CONTROL
BRAKE SW.
6G-4195
G939-PK
610-OR-14
2
1
F743-GY
WH
BK
610-OR-14
610-OR-14
CAB ROOF
GND BOSS
610-OR-14610-OR-14
975-WH
2
1
K997-BU
105-RD
447-PK
129-RD
975-WH
F743-GY
975-WH
310-PU 310-PU
837-GN
201-BK
CHG
FUEL
LEVEL
SENDER
118-0691
201-BK
447-PK 447-PK
200-BK
322-GY
RUN LAMP
107-6689
200-BK-14
610-OR-14
FORWARD
HORN
7T-0969
610-OR-14
200-BK-14
RUN LAMP
107-6689
2
A
B
C
+ V
GROUND
HYDRAULIC OIL
TEMP. SENSOR
118-7226
K997-BU
201-BK
442-GY
975-WH
F743-GY
SIGNAL
OR-18
BK-18
WH-18
2
1
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)
TWO LEVEL LIFT
RELIEF SOLENOID
GY
PU
BR
RED
WHITE
ORANGE
YELLOW
PINK
ABBREV COLOR
BLACK
GRAY
PURPLE
BROWN
DESCRIPTIONSYMBOL
CONNECTOR
ELECTRICAL CONNECTION
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
BLADE, SPADE, RING,
OR SCREW TERMINAL
BK
PK
YL
OR
WH
RD
GN
BU
GREEN
BLUE
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ATCH WIRE, CABLE,
COMPONENT
L#
CIRCUIT GROUPING
DESIGNATION
UNLESS OTHERWISE SPECIFIED ALL WIRE IS 18 GAGE
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF
AND XMSN SHIFTER IN NEUTRAL
IDENT PART NO. NOTE
521-YL-14
124-GN-14
164-WH
164-WH
200-BK
REAR
WASHER
7T-8890
FRONT
WASHER
7T-8890
102-RD-12
MOTOR MOTOR
3
G939-PK
8
1
2
7
6
5
4
3
9
E903-YL
B
A
C
836-WH
419-YL
615-YL
F780-PK
SENSOR/SPEED
CAL SW
9G-0011
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
9P-4608
SWITCH AS.
9P-4609
ACTUATOR
(PART OF 3W-3303)
307-OR
F795-YL
844-GN
164-WH
615-YL
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
NOTE E
K997-BU
447-PK
442-GY
RIGHT STEERING
PEDAL SENSOR
9X-5592
LEFT STEERING
PEDAL SENSOR
9X-5592
CENTER PEDAL
SENSOR
9X-5592
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
ATCH
K
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
200-BK-14
101-RD-14
1
2
101-RD-14
112-PU-14
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
UNUSED
164-WH-14
308-YL
10A
164-WH-14
850-PU
CHARGE
PRESSURE
SENSOR
130-4574
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
117-4868
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
RH PILOT PRESS. SNSR 36
24
32
UNUSED
822-PK
828-WH
829-GN
830-OR
851-WH
852-GN
COOLANT TEMP.SENSOR
LH PILOT PRESS. SNSR
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)
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
ENGINE SPEED +
UNUSED
13
30
10
14
25
21
UNUSED
RIGHT REVERSE SOL.
LEFT FORWARD SOL.
37
39
31
19
7
DATA LINK -
DATA LINK +
UNUSED
SOLENOID RETURN
PARK.BRAKE SW.(N/O)
PARK.BRAKE SW.(N/C)
8
2
40
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
HARNESS CODE
CONNECTOR
117-4867
275-BK
831-PK
321-BR
274-BK
105-RD
326-PU
307-OR
R
C
S
B
273-BK
272-BK
OFF
271-BK
848-GY
610-OR-14
610-OR-14
270-BK
201-BK
ON
ST
200-BK
200-BK-14
615-YL
615-YL
200-BK
322-GY
201-BK
200-BK-14
201-BK
201-BK
NOTE E: ACTIVATED IN THE BUCKET RACKBACK POSITION
REAR FRAME
GND BOSS
200-BK-14
201-BK
B
THIS SCHEMATIC IS FOR THE 953C (110-0918)
CATERPILLAR MONITORING SYSTEM
TO MACHINE STRUCTURE
AIR INLET HEATER
CATERPILLAR
MONITORING
SYSTEM
GAUGE CLUSTER
CONN 1
CONN
2
IMPLEMENT HOLD POSITION SWITCHES
CONN 5
CONN 6
ELECTRONIC HYDROSTATIC
CONTROL 118-0521
AIR INLET HTR RELAY
CONN 4
CONN3
CONN 7
CONN 8
CONN 8
CONN 9
CONN 10
CONN 11
CONN 12
CONN 13
AIR INLET
HEATER
CONN
14
A/C CLUTCH SOL ASSY
L1
L1
L1
L3
L2
L10
L2
L3
L1
L4
L6
L4
L5
L8
L9
L7
L11
L5
L5
L4
L12
L4
L12
L7
L9
L8
L1
L7
L9
L8
L11
L14
L12
L12
L3
L13
L13
L3
L11
L13
L14
L10
L10
L10
L2
L8
L7
L6
L9
L11
L5
L5
L5
L11
L11
L9
L9
L2
L2
3E-8574
D55465
799-WH
441-OR
831-PK
0939-PK
G939-PK
G939-PK
H835-GY
H832-YL
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
G939-PK
G939-PK
799-WH
799-WH
H835-GY
H832-YL
522-WH
G939-PK
443-YL
831-PK
G939-PK
405-GY
326-PU
799-WH
403-GN
441-OR
521-YL-14
310-PU
H835-GY
H832-YL
24 VOLT RADIOS
9X-6779 FIXED U.S.
9X-6778 REMOVEABLE U.S.
3E-7890 FIXED EUROPE
9X-5288 REMOVEABLE EUROPE
NOTES: