525 WHEEL SKIDDER ELECTRICAL SYSTEM SCHEMATIC

SENR6694
May 1995
525 Wheel Skidder
Electrical System
1DN1-667
Wire Description
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
Power Circuits
Accessory Circuits
101 RD BAT(÷) 500 BR WIPER - FRONT (PARK)
103 YL AUXCKT 501 GN WIPER - FRONT (LO)
105 RD KEY SW 502 OR WIPER - FRONT (HI)
109 RD ALT OUTPUT (+) TERM 503 BR WIPER - REAR (PARK)
112 PU MAIN POWER RLY OUTPUT 504 YL WIPER - REAR (LO)
114 RD WARNING HORN (FORWARD) 505 BU WIPER - REAR (HI)
115 RD STD LAMPS 506 PU WASHER - FRONT
118 GY FRONT WIPER 507 WH WASHER - REAR
119 PK REAR WIPER 508 PU RADIO SPEAKER - LEFT
124 GN A/C 509 WH RADIO SPEAKER - LEFT (COMMON)
126 PK XMSN CTRL 511 BR RADIO SPEAKER - RIGHT
127 OR ATCH LAMPS 512 GN RADIO SPEAKER - RIGHT (COMMON)
141 PK FAN GPS 513 OR A/C COMPRESSOR/REFRIG PRESS SW
165 YL DIFF LOCK 515 GY BLOWER MOTOR (HI)
Ground Circuits 516 GN BLOWER MOTOR (MEDIUM)
200 BK MAIN CHASSIS 517 BU BLOWER MOTOR (LO)
201 BK OPR MON PANEL VMIS CMS 521 YL A/C SW TO REFRIGERANT SW
202 BK XMSN CTRL 522 WH A/C CLUTCH TO THERMOSTAT SW
270 BK CMS IDENT CODE 0 A503 PK FRONT DEFROSTER FAN (LO)
271 BK CMS IDENT CODE 1 A504 GN REAR DEFROSTER FAN (LO)
272 BK CMS IDENT CODE 2 A506 OR FRONT DEFROSTER FAN (HI)
273 BK CMS IDENT CODE 3 A507 YL REAR DEFROSTER FAN (HI)
274 BK CMS IDENT CODE 4 Lighting Circuits
275 BK CMS DENT CODE 5 607 PK FLOOD LAMP - FRONT
290 BK CMS SERVICE 608 GN FRONT LAMP - REAR
291 BK CMS CLEAR 614 PU PARK/TAIL/DASH LAMP
Basic Machine Circuits 630 GY FLOOD LAMP REAR (ATTACH)
301 BU STARTER NO. 1 SOL Control Circuits
304 WH STARTER RLY NO. 1 OUTPUT 751 GN XMSN SHIFT SOL NO. 1 OR 3
306 GN STARTER RELAY COIL TO XMSN CONTROL 752 YL XMSN SHIFT SQL NO. 2
307 OR KEY SW TO XMSN/GRAPPLE CONTROL 754 BU XMSN SHIFT SQL NO. 3 OR 1
308 YL MAIN POWER RLY COIL 755 OR XMSN SHIFT SQL NO. 4 OR 5
310 PU START AID SW TO START AID SOL E707 GN VMIS DISPLAY +V
311 WH START AID SOL TO TEMP SW E708 PK VMIS DISPLAY CLOCK
321 BR BCKP ALARM LAMP TRAVEL ALARM E735 PU CAT MONITOR OPERATOR SW
322 GY WARNING HORN (FORWARD) F793 OR ATA DATA LINK
324 BU DIFF LOCK SOL G750 BU XMSN CONT FWD SW TO GND
326 RD KEY SW "C" TERM G755 YL XMSN CONT REV SW TO GND
331 OR BCKP ALARM RLY COIL G760 WH XMSN CONT SPEED 2 SW TO GND
Monitoring Circuits G761 YL XMSN CONT SPEED 3 SW TO GND
403 GN ALTERNATOR (R) TERM G762 BR XMSN CONT SPEED 4 SW TO GND
405 GY OPR MON OIL PRESS (LO SETTING) G763 PU XMSN CONT NEUT SW TO GND
410 WH OPR MON FAULT ALARM G768 GN XMSN CONT SPEED 1 SW TO GND
411 PK OPR MON MASTER FAULT LAMP E851 BU GRAPPLE 2ND FUNCTION SELECT
419 WH OPR MON PARKING BRAKE E852 YL GRAPPLE TONG CLOSE PRESS SENSOR
426 BR OPR MON XMSN FILTER BYPASS E853 PU GRAPPLE TONG OPEN SQL
432 PK OPR MON BRAKE PRESS (OIL) E854 GN GRAPPLE TONG CLOSE SQL
441 OR ENG COOLANT TEMP GAGE E855 WH GRAPPLE ROTATE CW SQL
442 GY HYD SYSTEM TEMP GAGE E856 GY GRAPPLE ROTATE CCW SQL
443 YL POWER TRAIN TEMP GAGE F838 BR GRAPPLE TONG CLOSE AUTO/MANUAL SW
447 PK FUEL LEVEL GAGE F839 OR GRAPPLE TONG OFF INPUT
498 WH DIFF LOCK INDICATOR F840 YL GRAPPLE ROTATE OFF INPUT
C413 YL VMIS DISPLAY DATA 900 PU XMSN SHIFT SOL NO. 4 OR 5
C414 BU VMIS DISPLAY LOAD 901 WH XMSN SHIFT SQL NO. 6
C436 BU DIFFERENTIAL FILTER PRESS SW 903 BU XMSN SHIFT SQL NO. 8
C484 YL REAR DIFFERENTIAL FILTER PRESS SW 921 WH XMSN SQL NO. 1 OR 3 RETURN
944 OR DATA LINK + (CAT)
945 BR DATA LINK - (CAT)
961 BR SELECTOR SW
991 WH XMSN NEUT
C906 PU CONT TO SW
C907 WH CONT TO SW
K927 BU SOLENOID RETURN 1
Component Identifier (CID¹)
Module Identifier (MID²)
(MID No. 030)
CID No. Component
96 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
819 Display Data Link
821 9 Volt Display Power Supply
Electronic Transmission/Grapple Control
(MID No. 81)
168 Electrical System Voltage
417 Grapple Solenoid Return Relay
444 Start Relay
449 Grapple Rotate Switch
450 Tong Position Switch
451 Grapple Clockwise Solenoid
452 Grapple Counterclockwise Solenoid
453 Tong Open Solenoid
454 Tong Close Solenoid
455 Tong Close Pressure Sensor
621 Downshift Switch
622 Upshift Switch
623 Direction Switch
641 Transmission Solenoid 1 (forward high)
642 Transmission Solenoid 2 (reverse)
643 Transmission Solenoid 3 (forward low)
644 Transmission Solenoid 4 (speed)
645 Transmission Solenoid 5 (speed)
646 Transmission Solenoid 6 (speed)
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.
Component Location
Component
Schematic
Location
Machine
1
Location
(White
Callouts)
Component
Schematic
Location
Machine ¹
Location
(White
Callouts)
Alarm - Action
D-5 B
Switch - Disconnect
F-2 21
Alarm - Backup
A-9 1
Switch - Engine Oil Pressure
D-2 23
Alternator
C-2 2
Switch - Front Defrost Fan
F-5 23
Batteries
F-2 3
Switch - Front Differential Pressure
F-5 24
Circuit Breaker - Main
A-3 A
Switch - Front Lamp
D-6 23
Circuit Breaker - Standard Lamps
A-2 A
Switch - Front Washer
E-6 23
Control - Relay
C-3 A
Switch - Front Wiper
E-6 23
Control - Transmission/ Grapple
B-5 B
Switch - Front/Rear Washer (Attch)
E-5 23
Fuses
A-2,B-2 A
Switch - Grapple Auto/Manual
C-7 B
Gauge - Quad Gage Module
E-4 B
Switch - Key Start
C-6 B
Handle - Grapple Control
A-7 C
Switch - Park Brake Pressure
D-3 20
Horn - Forward
D-1 4
Switch - Rear Defrost Fan
F-6 23
Lamp - Action
D-5 B
Switch - Rear Differential Pressure
F-6 24
Monitor - Caterpillar Monitoring Sys
E-4 B
Switch - Rear Wiper
E-6 23
Motor - Front Wiper
F-3 5
Switch - Rear/Center Lamp
D-6 23
Motor - Rear Wiper
A-8 6
Switch - Refrigerant Pressure
E-2 16
Motor - Starting
C-2 7
Switch - Start Aid
C-6 B
Motors - Blower
D-7 8
Switch - Thermostat
D-7 8
Motors - Front & Rear Washer
F-7 9
Switch - Transmission Filter Pressure
A-5 25
Motors - Right & Left Defrost Fan
F-5 10
Switch - Transmission Neutral Lock
C-6 B
Radio
F-4 11
Switch - Transmission Temperature
A-6 25
Relay - Grapple Solenoid Return
A-4 B
Relay - Main
A-2 A
Relay - Start
A-3 A
Resistor - Blower Speed
B-6 12
Sender - Converter Temperature
C-9 13
Sender - Coolant Temperature
E-1 14
Sender - Fuel Level
B-9 1
Sender - Hydraulic Temperature
E-3 15
Sensor - Grapple Pressure
A-9 1
Solenoid - Air Conditioner Clutch
E-2 16
Solenoid - Front Differential Lock
D-1 17
Solenoid - Fuel Shutdown
C-2 18
Solenoid - Rear Differential Lock
B-9 19
Solenoid - Start Aid
E-2 15
Solenoid Valves- Transmission
C-9,D-9 13
Solenoids - Grapple Rotate CW/CCW
A-9 1
Solenoids - Grapple Tong Open/Close
A-9 1
Steering Wheel Group
C-5 B
Suppressor - Arc (A/C Clutch Solenoid)
E-2 16
Switch - Accumulator Charge Pressure
D-3 20
Switch - Blower
B-7 C
Switch - CAT Monitor Sys Select
C-5 B
Switch - Coolant Temp (Start Aid)
D-1 14
Switch - Differential Lock
B-7 C
1
Machine locations are repeated for components located close together.
A = Component in relay panel area.
B = Component in dash area.
C = Component in right console area.
Connector Location
1
Connector Number
Schematic
Location
Machine
Location
(Black
Callouts)
COO1
Service Mode Plug
F-8 1
C002
Service Tool Conn
F-8 1
C003 F-7 2
C004 D-8 3
C005 C-9 4
C006 B-9 5
C007 B-9 5
C008 B-6 3
C009 E-5 B
C010 C-5 B
C011 C-4 6
C012 B-4 6
C013 B-3 7
C014 B-2 8
C015 B-2 8
C016 A-2 A
²
Machine locations are repeated for components located close together.
A = Connector in relay panel area.
B = Connector in dash area.
C = Connector in right console area.
1
Connectors that join a harness to a component are generally located at or
near the component. See the Component Location chart.
Failure Mode Identifier (FMI)
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
Alternator114-2401 (30SI)
SENR7508
Caterpillar Monitoring System
SENR6717
Starting Motor:
6V-5207 (42MT)
6V-5023 (KE 7.5)
6V-5226 (F8.0)
SENR3581
SENR3536
SENR4975
Electronic Transmission/Grapple Control
SENR6686
Title
Mode Of Operation Mode Number
Normal 0
Harness Code 1
Numeric Readout 2
Service 3
Tattletale 4
Monitoring System Modes
Resistor, Sender and Solenoid Specifications
Part No. Component Description Resistance (Ohms)¹
9G-1950 Resistor - Blower Motor Speed Overall 2.0 ± .1; Tap 1.0 ± .05
7N-8532
560 to 716 at 54°C (130°F)
72 to 82 at 110°C (230°F)
104-5546 Sender - Fuel Level
Empty - 95.5 ± 3.5
Full - 2.5 ± 2.5
4W-9972 Sender - Hydraulic Oil Temperature
560 to 716 at 54°C (130°F)
72 to 82 at 110°C (230°F)
102-0347 Solenoid - Air Conditioner Clutch 14.4 ± 0.6
112-6945 Solenoids - Front And Rear Differential 34.3 ± 1.7
3E-7985 Solenoid - Fuel Shutdown
1.55 ± 0.15 for Start (Latch) Coil
10.3 ± 1.03 for Stop (Unlatch) Coil
3E-6332 Solenoid - Start Aid 6.0
7T-451 3 Solenoids - Transmission (Valves 1, 2 and 3) 33.8 ± 1.0
9W-2739 Solenoids - Transmission (Valves 4, 5 and 6) 31.1 ± 2.4
¹At room temperature.
Senders: Engine Coolant Temperature
Converter Temperature
Off Machine Switch Specification
Part No. Function Actuate Deactuate Contact Position
3E-6425
Engine Coolant Temperature
(Start Aid)
38 ± 3°C
(100.4° ± 5.4°F)
27 °C MIN
(80.6°F MIN)
Normally Closed
3E-7806
Accumulator Charge
Pressure
9500 kPa MAX
(1375 psi MAX)
8300 ± 350 kPa
(1200 ± 50 psi)
A-B, Normally Open
A-C, Normally Closed
3E-7807 Park Brake Pressure
4000 kPa MAX
(580 psi MAX)
3500 ± 110 kPa
(510 ± 16 psi)
A-B, Normally Open
A-C, Normally Closed
3E-9350 Transmission Temperature
52 ± 3°C
(125 ± 5.0°F)
43°C MIN
(110°F MIN)
Normally Closed
9X-7781 Power Train Filter Pressure
210 ± 70 kPa
(30 ± 10 psi)
—
—
Normally Open
101 -5459 Engine Oil Pressure
90.0 kPa MAX
(13.0 psi MAX)
70.0 ± 20.0 kPa
(10.0 ± 3.0 psi)
Normally Open
114-5333 Refrigerant Pressure (AC)
275 to 1750 kPa ¹
(40 to 255 psi)
—
—
Normally Open ²
116-9846
Front Differential Pressure
Rear Differential Pressure
276 ± 28 kPa
(40.0 ± 4.0 psi)
179 kPa MIN
(26 psi MIN)
Normally Closed
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).
White callouts are for components.
See Component Location Chart.
Black callouts are for harness connectors.
See Connector Location Chart.
A
1
2
3
4
5
6
3
4
5
6
8
9
10
11
12
14
15
13
16
B
C
1
2
17
18
19
20
21
22
23
24
25
7
Machine Harness Connector And Component Locations
A
3
4
5
6
8
9
10
11
12
14
15
13
16
B
C
1
2
17
18
19
20
21
22
23
24
25
7
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.
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
©
1995 Caterpillar
All Rights Reserved
Printed in U.S.A.
For Cable and Grapple Machines
2
5
1
3
4
6
119-PK
118-GY
118-GY
506-PU
507-WH
200-BK-16
200-BK-16
614-PU-16
614-PU-16
614-PU-16
614-PU-16
200-BK-16
200-BK-16
2 3
X
B
F-7SPEAKER 00123-3726X
G
2
1
3
115-RD-14
200-BK-14
200-BK-16
200-BK-16
200-BK-10
614-PU-16
200-BK-16
200-BK-16
200-BK-16
614-PU-16
614-PU-16
614-PU-16
614-PU-16
200-BK-16
200-BK-16
2
200-BK-16
200-BK-16
614-PU-16
614-PU-16
11
9
614-PU-16
614-PU-16
200-BK-16
200-BK-16
2
5
3
6
200-BK-16
200-BK-16
614-PU-16
614-PU-16
G
G
B
B
LAMP
7N-5876
B
200-BK-16
B
8
614-PU-16
7
6
5
12
1
10
4
3
201-BK
2
C436-BU
B
2
201-BK426-BR
201-BK
426-BR
XSMN
TEMP SW
3E-9350
BK 2
201-BK
1
BK
BK
F840-YL
F839-OR
40
C436-BU
39
1
38
37
36
35
REAR DIFFERENTIAL
PRESS SW
116-9846
FRONT DIFFERENTIAL
PRESS SW
116-9846
34
33
32
31
30
29
28
27
26
200-BK-10
25
24
23
22
F
F
3
2
B
A
GRAPPLE
AUTO/MANUAL
SW
121-0128
1
21
202-BK
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
BUA OUT
GND
K927-BU
+ BAT
BUA INP
UNUSED
UNUSEDYL
GY
BR
K927-BU
C
5
324-BU
114-RD
K927-BU
114-RD
114-RD
A
515-GY-14
515-GY-14
200-BK-14
522-WH-14
200-BK-14
4
3
2
1
201-BK
F
E
F840-YL
D
202-BK
F839-OR
1
2
7
6
8
4
3
TRANSMISSION SHIFT
LOGIC TABLE
(X=ENERGIZED)
X
X
X
X
X
118-GY
XX
X
X
X
X
X
X
X
G
614-PU-16
614-PU-16
200-BK-16
200-BK-16
200-BK-16
614-PU-16
200-BK-16
614-PU-16
614-PU-16
614-PU-16
3R
2R
1R
J
1
2
WH
BK
BK
SIG OUT
E735-PU
GROUND
201-BK
200-BK-16
614-PU-16
E735-PU
614-PU-16
200-BK-16
2
944-OR
945-BR
103-YL
291-BK
290-BK
290-BK
291-BK
103-YL
945-BR
944-OR
4F
MOTOR
REAR
WASHER
7T-8890
507-WH
200-BK-14
3F
614-PU-16
A
2F
614-PU-16
F C
V
F
F
F
V
F
1F
F
V
NEUTRAL
F
6543
F
614-PU-16
G
G
G
ATCH FRONT/
REAR WASHER SW
3E-7158
506-PU
36
25
28
20
9
8
19
7
1
4
17
13
6
5
32
507-WH
506-PU
3
118-GY
118-GY
2
B
A
31
33
30
+ BATTERY
B
C
A RD
BK
YL
202-BK
GRAPPLE PRESS
SENSOR GP
124-0790
12
11
10
9
8
7
6
5
4
3
2
1
K927-BU
21
GRAPPLE
ROTATE
SOL
124-7795
WH 1
2
2
SOLENOIDS
G
C-5
G
00
G
118-2943
115-RD-14
V
E852-YL
G
GEAR
UNLOCKED
LOCKED
MANUAL
AUTO
CCW
C
W
K927-BU
CLOSE
BK
F838-BR
ROTATE CCW INPUT
BK
1
5
29
E851-BU
34
35
18
16
15
14
12
11
10
23
24
21
22
39
37
38
2
27
26
3
GRAPPLE SOL
RETURN RELAY
3E-5239
40
RD-00
944-OR
4
5
6
200-BK-14
A
200-BK-14
115-RD-14
1BK
945-BR
GPL SOL RET RELAY
F
2
A
A
103-YL
H
324-BU
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
200-BK
E-501
23
22
21
20
19
B
18
17
16
15
14
F
G
H
G
13
9
12
11
10
9
8
7
6
5
4
3
2
1
202-BK
1
S
291-BK
201-BK
RD-00
290-BK
321-BR
C436-BU
25
24
512-GN
511-BR
508-PU
509-WH
C484-YL
LOWER CAB
23
OR
C
BK
RELAY CONTROL
117-9364
RD
22K927-BU
200-BK-16
614-PU-16
X
X
LH
SPEAKER
6T-7695
G
103-YL
T
BK-00
BK-00
AUXILIARY
START
RECEPTACLE
6I-9412
A
B
C
C484-YL
C436-BU
C
C484-YL
9U-8746T
21
B
A
521-YL-14
522-WH-14
C436-BU
C484-YL
C484-YL
C436-BU
RR DIFF FILTER BYPASS
FR DIFF FILTER BYPASS
202-BK
OFF
A
A
A
A A
112-PU-10
112-PU-10
112-PU-10
112-PU-10
H
H
D
118-2946
CW
F
F
F
CCW
D
D
112-PU-10
F
F
F
G
C
J
200-BK-12
200-BK
200-BK-12
119-PK
614-PU-16
502-OR
507-WH
501-GN
200-BK
500-BR
630-GY
608-GN-16
1 WH
607-PK-16
200-BK
504-YL
3
505-BU
J
200-BK-12
503-BR
CAT MON SYS
SELECT SW
119-4434
200-BK-16
200-BK
505-BU
503-BR
141-PK
118-GY
200-BK-16
F
119-PK
4
2
6
3
5
OR
BK
BR
H
L
REAR WIPER
114-6685
MOTOR
T
P
B+
200-BK
127-OR
G
614-PU-16
504-YL
1
F
200-BK-14 200-BK-10
202-BK
119-PK
201-BK
202-BK
119-PK
C484-YL
200-BK-16
BK
BK
1
2
123-3196
Y
E-500123-6079Y
FRONT
WASHER SW
123-6363
405-GY
201-BK
ENGINE OIL
PRESS SW
101-5459
2
1
BK
614-PU-16
517-BU-14
200-BK-16
516-GN-14
515-GY-14
BK
BK
403-GN115-RD-14
200-BK-16
LEFT DEFROST
FAN GP
122-1926
RIGHT DEFROST
FAN GP
122-1926
614-PU-16
115-RD-14
FRONT DEFROST
FAN SW
3E-7174
504-YL
505-BU
115-RD-14
201-BK
201-BK
141-PK
1
103-YL
126-PK
291-BK
4
A503-PK
HARNESS
CODE
PLUG
J
SEVICE
MODE
PLUG
290-BK
8
7
6
H
G
F
C
G
A
5
C
D
A
B
5
6
4
2
3
202-BK
201-BK
2
A
B
E
3
D
118-GY
118-GY
202-BK
321-BR
201-BK
447-PK
2
1
200-BK
447-PK
202-BK
FUEL LEVEL
SENDER
104-5546
B
1
J
522-WH-14
141-PK
127-OR
115-RD-14
G
124-GN-14
G
G
6
3
5
521-YL-14
119-PK
4
3
2
TONG OFF
OPEN
1
201-BK
2
A
321-BR
FRAME
GND STRAP
STRG COLUMN
614-PU-16
2
5
3
2
5
1
3
6
G
G
16
614-PU-16
ACTION LAMP
123-5182
201-BK-16
614-PU-16
201-BK
202-BK
079F-4337
014D-6565
L
G755-GY
G761-YL
G750-BU
G760-WH
G768-GN
XSMN NEUTRAL LOCK
14
G763-PU
119-PK
G
G
1
START RELAY
GROUND
SOLENOID 6
SOLENOID 5
SOLENOID 4
SOLENOID 2
SOLENOID 1
SOLENOID 3
SOLENOID RETURN
BUA RELAY
521-YL-14
921-WH
A/C CLUTCH
SOL
3E-1906
124-GN-14
REAR
FLOOD
LAMP
112-9378
MOTOR
126-PK
G
1
2
124-GN-14
G
521-YL-14
513-OR-14
E
E
E
E
E
E
E
115-RD-14
127-OR
141-PK
614-PU-16
507-WH
506-PU
C
C
C
C
C
WH
B
2
1
F793-OR
118-GY
500-BR
501-GN
502-OR
630-GY
G
C
12V BATTERY
STD 3T-5760
426-BR
BK
BK
RD
NEUTRAL SW
608-GN-16
200-BK-16
331-OR
507-WH
310-PU
505-BU
503-BR
502-OR
501-GN
500-BR
G
24
200-BK-16
165-YL
BU
202-BK
23
608-GN-16
608-GN-16
630-GY
201-BK
201-BK
103-YL
G
UNUSED
322-GY
22
201-BK
202-BK
THERMOSTAT
3E-5464
BLOWER
121-2897
RESISTOR
9G-1950
498-WH
324-BU
WH/RD-14
200-BK-14
21
BK-14
522-WH-14
2
200-BK-14
515-GY-14
BLOWER SW
6P-3236
517-BU-14
516-GN-14
515-GY-14
521-YL-14
506-PU
200-BK
506-PU
200-BK-16
124-GN-14
1
REAR
FLOOD
LAMP
112-9378
20
6
201-BK
3
5
19
12
11
10
9
201-BK
8
7
18
6
5
4
LOWER CAB
201-BK
G
201-BK
202-BK
201-BK
FORWARD SW
8
2
502-OR
501-GN
500-BR
17
118-GY
16
15
506-PU
2
507-WH
14
3
2
REVERSE SW
UPSHIFT (N/C)
UPSHIFT (N/O)
B
DOWNSHIFT (N/C)
13
DOWNSHIFT (N/O)
REAR
WIPER SW
123-6367
F
7
201-BK
6
119-PK
127-OR
504-YL
118-GY
141-PK
6
5
4
9X-6778
RADIO
12
RH
SPEAKER
6T-7695
2
DOME LAMP
107-6032
11
201-BK
201-BK
200-BK-14
1
01
123-3725
F
126-3899
522-WH-14
443-YL
614-PU-16
201-BK
2
1
FRONT
FLOOD
LAMP
112-9378
10
201-BK
9
GRAPPLE
TONG SOL
124-7795
10A
5
607-PK-16
200-BK-16
200-BK
F793-OR
2
4
G
126-4927
4
200-BK
F
8
F
X
B
A
447-PK
310-PU
A507-YL
3
2
12V BATTERY
STD 3T-5760
2
2
6
201-BK
7
508-PU
119-PK
1
200-BK-16
LOWER CAB
502-OR
A
B
921-WH
326-RD
DIFF
LOCK
SOLENOID
112-6945
200-BK-16
200-BK-10
3
6
1
CHASIS
301-BU-10
7
J
BK
F840-YL
ENGINE
202-BK
614-PU-16
921-WH
CLOSE
308-YL
326-RD
521-YL-14
200-BK
324-BU
310-PU
10
8
522-WH-14
PD BOX
6
141-PK
141-PK
T
A504-GN141-PK
200-BK-16
326-RD
200-BK-12
C
REAR DEFROST
FAN SW
3E-7174
509-WH
321-BR
141-PK
C
4
A506-OR
GRAPPLE
ROTATE
XMSN
DASH
6
4
326-RD
B
200-BK-16
XSMN NEUTRAL
LOCK SW
119-4435
TONG
OPEN
CLOSE
202-BK
C
Z
202-BK 202-BK
202-BK
5
BU(ON)
RD(OFF)
A503-PK
A504-GN
A507-YL
419-WH
PARK BRAKE SW
A
F
TO CAB
ROOF
141-PK
UPPER CAB
3
CAT DATA LINK+
4
5
GPL CCW SOL
1
TONG CLOSE SOL
TONG CLOSE INPUT
F
921-WH
755-OR
Z
J
752-YL
A
751-GN
Z
F-2
126-PK
900-PU
901-WH
200-BK
C
751-GN
00
921-WH
754-BU
00
503-BR
F
200-BK-14
9X-3052
F840-YL
F839-OR
F839-OR
419-WH
126-PK
505-BU
J
306-GN
2
1
1
331-OR
A
2
E856-GY
3
991-WH
E855-WH
E854-GN
755-OR
H
E853-PU
G
1
513-OR-14
508-PU
BK
752-YL
751-GN
754-BU
755-OR
900-PU
BK
F
901-WH
126-PK
419-WH
E856-GY
202-BK
E855-WH
754-BU
901-WH
ARC SUPPRESSOR
106-8704
C
921-WH
X
E854-GN
509-WH
900-PU
Z
B
E853-PU
961-BR
2
306-GN
511-BR
200-BK
331-OR
751-GN
X
511-BR
512-GN
512-GN
X
307-OR
752-YL
755-OR
921-WH
200-BK
2
G761-YL
G760-WH
322-GY
A
ROTATE OFF INPUT
E852-YL
F
E
4
C
F
G
614-PU-16
A
G768-GN
G755-GY
G750-BU
G763-PU
G762-BR
991-WH
E856-GY
C
BK
D
PARK BRAKE
PRESS SW
3E-7807
E855-WH
945-BR
E854-GN
E851-BU
E851-BU
504-YL
E853-PU
961-BR
5
202-BK
FUEL SHUTDOWN
SOL
3E-7985
BLOWER MOTORS
C907-WH
500-BR
118-GY
322-GY
F
202-BK
944-OR
E851-BU
115-RD-14
119-PK
S
DIFF LOCK
SW
119-4440
126-PK
127-OR
201-BK
141-PK
432-PK
124-4775
118-GY
00124-4774
310-PU
607-PK-16
447-PK
443-YL
J
201-BK
J
403-GN
J
R PP
202-BK
C906-PU
201-BK
608-GN-16
441-OR
405-GY
432-PK
442-GY
1
201-BK
B
2
447-PK
J
1
C906-PU
201-BK
E852-YL
630-GY
6
5
630-GY
200-BK
100-2832
3
441-OR
6
443-YL
1
442-GY
2
201-BK
291-BK
200-BK-14
2
G
4
945-BR
515-GY-14
KEY SWITCH
290-BK
921-WH
755-OR
443-YL
443-YL
944-OR
944-OR
945-BR
290-BK
SIG
VS
291-BK
101-RD-4
201-BK
A
2
201-BK
500-BR
308-YL
3
112-PU-10
503-BR
752-YL
751-GN
BATTERY
BK-14
1
K927-BU
5
00
F
945-BR
WH/RD-14
F793-OR
200-BK-16
614-PU-16
4
331-OR
202-BK
G762-BR
G763-PU
115-RD-14
G768-GN
2
G760-WH
F838-BR
322-GY
G750-BU
00
2
8
A506-OR
20
G761-YL
944-OR
290-BK
291-BK
126-PK
E852-YL
E852-YL
MOTOR
944-OR
1
322-GY
945-BR
442-GY
G
7
ANTENNA AS.
8E-1118
426-BR
ANTENA
LEFT SPKR +
RIGHT SPKR +
00
C436-BU
324-BU
C484-YL
165-YL
124-GN-14
GROUND
A
RIGHT SPKR -
LEFT SPKR -
+ BATTERY
STEERING WHEEL
GROUP
123-7406
200-BK
306-GN
308-YL
200-BK
B
324-BU
200-BK
201-BK
126-PK
ACCUMALATOR
CHARGE PRESS
SW
3E-7806
945-BR
F
G
501-GN
201-BK
C
200-BK-16
F793-OR
200-BK-14
B
D-4G
G
F
J A-4
A
A-4H
THIS SCHEMATIC IS FOR THE 525 SKIDDER
AND XSMN SHIFTER IN NEUTRAL WITH BRAKE
ACCUMULATOR DISCHARGED
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF,
C-6
D-6
D-6
D-900
R
P
N
CABLE AS.
124-4776
E-2
C-6
C
F-1
S
M
L
A
K
WIRE AS.
C
C
F-8F
F-4E
A-1D
C-4C
B-2B
B-3A
UNLESS OTHERWISE SPECIFIED: ALL WIRE IS 18 GAGE (AWG)
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
A
A
ATCH WIRE, CABLE,
COMPONENT
CIRCUIT NOT CONNECTED
CIRCUIT CONNECTED
BLUE
GREEN
BU
GN
RD
WH
OR
YL
PK
BK
BLADE, SPADE, RING,
OR SCREW TERMINAL
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
ELECTRICAL CONNECTION
TO VEHICLE STRUCTURE
CONNECTOR
SYMBOL DESCRIPTION
BROWN
PURPLE
GRAY
BLACK
COLORABBREV
PINK
YELLOW
ORANGE
WHITE
RED
BR
PU
GY
HARNESS AS.
LOCPART NO.IDENT
921-WH
(118-6390 CHG 00)
K927-BU
755-OR
752-YL
751-GN
900-PU
901-WH
C907-WH
200-BK-12
103-YL
900-PU
754-BU
F
200-BK-16
G
501-GN
C
BLOWER
121-2896
200-BK-16
3
OPERATOR STATION
K927-BU
944-OR
105-RD
G
607-PK-16
GND
608-GN-16
PLATFORM
GND
G
324-BU
BACKUP
ALARM
123-6449
OPERATOR STATION
G
BK-00
G
127-OR
E708-PK
270-BK
200-BK
290-BK
275-BK
291-BK
274-BK
E707-GN
273-BK
272-BK
C414-BU
271-BK
201-BK
201-BK
201-BK
201-BK
961-BR
201-BK
OPEN
201-BK
T
H
921-WH
RD-00
921-WH
752-YL
921-WH
NEG POS
C907-WH
324-BU
201-BK
411-PK
410-WH 201-BK
2
1
00
442-GY
443-YL
441-OR
447-PK
432-PK
405-GY
MOTOR
TONG OPEN SOL
ROTATE CW INPUT
C906-PU
C
A
630-GY
GND
B+
P
T
TONG OPEN INPUT
C903-BU
900-PU
921-WH
901-WH
3
607-PK-16
C903-BU
DIFF
LOCK
SOLENOID
112-6945
1
901-WH
FRONT
WIPER SW
123-6365
507-WH
754-BU
TRANSMISSION SOLENOID
VALVES
9W-2739
921-WH
SOL 1
FWD HIGH
201-BK
L
SOL 2
REV
SOL 3
FWD LOW
1
8
GPL CW SOL
N
2
1
BK
118-GY
118-GY
501-GN
2
3
C906-PU
7
6
PK
02
A
2
A
502-OR
5
F
OPERATOR STATION
OPERATOR STATION
DISCONNECT SW
7N-0718
START
AID SW
3E-7176
FORWARD
HORN SW
2T-3360
9G-7641
961-BR
426-BR
614-PU-16
MOTOR
1
UNUSED SENSOR INPUT
C
21
FRONT WIPER
114-6685
7
UNUSED SENSOR INPUT
OPERATOR SW INPUT
UNUSED SENSOR INPUT
4
UNUSED SENSOR INPUT
105-RD
308-YL
308-YL
DIFFERENTIAL LOCK
UNUSED SENSOR INPUT
UNUSED
UNUSED
1
307-OR
BK-00
RD-00
GPL AUTO/MAN SW
114-5333
200-BK-14
C413-YL
ST
ON
OFF
B
S
C
R
TONG PRESS SENSOR
QUAD GAGE
100-5895
GRAPPLE CNTL
HANDLE AS.
122-5841
E853-PU
F
1
E854-GN
405-GY
C907-WH
L
BU
YL
E856-GY
3
REFRIGERANT SW
200-BK
GN
OR
BK
NEG POS
FRONT
FLOOD
LAMP
112-9378
G
REAR
FLOOD
LAMP
112-9378
1
CAT DATA LINK-
H
921-WH
324-BU
165-YL
WH
921-WH
614-PU-16
BR
E855-WH
E854-GN
E851-BU
00
F
00
498-WH
02
426-BR
G762-BR
C906-PU
C907-WH
411-PK
410-WH
201-BK
GY
103-YL
403-GN
274-BK
273-BK
272-BK
271-BK
270-BK
202-BK
F
126-3919
115-RD-14
XSMN
FILTER SW
9X-7781
115-RD-14
426-BR
REAR/CENTER
LAMP SW
123-5865
201-BK
8
9
28
2
SOL 4
961-BR
10
36
29
SERVICE
TOOL
CONNECTOR
F839-OR
521-YL-14
C906-PU
961-BR
E852-YL
8V-4322
E855-WH
E856-GY
E853-PU
E853-PU
C
426-BR
E854-GN
E855-WH
5
20
426-BR
19
G755-GY
114-RD
200-BK-16
REAR
311-WH
310-PU
RD-00
N
24
B
18
119-PK
11
TO
ENGINE
BLOCK
M
614-PU-16
38
T
34
35
14
23
6
16
22
12
3
STARTER
106-8555
COOLANT
SENDER
7N-8532
SOL 6
1
2
SOL 5
2
1
TRANSMISSION SOLENOID
VALVES
7T-4513
32
40
31
37
30
10A
105-RD
1
87a
921-WH
HARNESS CODE 4
HARNESS CODE 3
HARNESS CODE 2
HARNESS CODE 1
103-YL
C907-WH
HARNESS CODE 0
2
25
441-OR
T
F839-OR
T
311-WH
MODULE CLOCK
202-BK
CLUSTER +V
19
CAT DATA LINK +
498-WH
607-PK-16
CAT DATA LINK -
HYD TEMP SENSOR
CNVT TEMP SENSOR
ACTION LAMP
FUEL LEVEL SENDER
B
COOL TEMP SENSOR
BRK OIL PRESS
ENG OIL PRESS
ACTION ALARM
2
GROUND
E851-BU
DATA
HARNESS CODE 5
ALTERNATOR
XSMN FILTER BYPASS
+ BATTERY
SERVICE
CLEAR
MODULE LOAD
MODULE DATA
+8V SENSOR SUPPLY
HARNESS CODE
BK
MODULE LOAD
CLOCK
+V DISPLAY
1
2
1
2
13
18
30
419-WH
TO
ENGINE
BLOCK
BK-4
STRAP AS. 8X-6645
FRONT
FLOOD
LAMP
112-9378
304-WH-8
GROUND
START AID
SOLENOID
3E-6332
1
C413-YL
C414-BU
3
11
E707-GN
D
D
KK
D
D
D
D
D
D
D
D
D
D
D
D
D
D
FRONT LAMP
SW
100-4423
D
D
D
D
FORWARD
HORN
7T-0969
322-GY
522-WH-14
2
FRONT
WASHER
7T-8890
502-OR
C
2
1
F
B
A
85
3
D
126-3898
498-WH
E708-PK
2
4
00
D
K
C
20A
109-RD-4
109-RD-4
306-GN
BK-18 308-YL
BK-18
921-WH
10A
10A
124-GN-14
115-RD-14
ELEC XSMN
DIFF LOCK10A
10A
10A
10A
12
G S
MTR BAT
MOTOR
103-YL
D
FRONT WIPER
127-OR
D
141-PK
118-GY
D
17
15
200-BK
109-RD-4
123-6540
00
515-GY-14
33
13
26
4
2
39
27
17
15
ACTION
ALARM
3E-6328
F
F
275-BK
86
BK
RD
HYDRAULIC
SENDER
4W-9972
F840-YL
1
OR
101-RD-4
DOWNSHIFT (N/O)
DOWNSHIFT (N/C)
630-GY
UPSHIFT (N/O)
UPSHIFT (N/C)
310-PU
BK
C
REVERSE SW
5
FORWARD SW
GN
5
B
3
MOTOR
6
2
4
A
498-WH
921-WH
200-BK-14
GROUND
NEUTRAL SW
B
498-WH
944-OR
200-BK-4
ALTERNATOR
114-2401
REAR WIPER
304-WH-8
ATCH LAMPS
BLOWER MOTOR
POWER DISTRIBUTION BOX
POWER DISTRIBUTION BOX
432-PK
FORWARD HORN
MOTOR
1
614-PU-16
500-BR
KEY
304-WH-8
308-YL
306-GN
B+
614-PU-16
403-GN
122-4248
BK-18
109-RD-8
614-PU-16
BK-18
200-BK
CONVERTER
SENDER
7N-8532
109-RD-4
STD LAMPS
101-RD-12
MAIN RELAY
101-7740
754-BU
START RELAY
3E0075
608-GN-16
GN
FUSE
9W-1442 10AMP
9W-1441 15AMP
9W-1446 20AMP
FUSE
HOLDER
9W-2035
109-RD-4
TONG OFF INPUT
80A
15A
10A
FRAME GROUND
607-PK-16
945-BR
BK
CHG
C
201-BK
118-2938
118-2937
E856-GY
B
COOLANT SW
3E-6425
614-PU-16
GN
200-BK
114-RD
TO
FRAME
BK
2
B
E
10A 105-RD
R
506-PU
1
F840-YL
T
10A
101-RD-4
MAIN BREAKER
9S-4693
CIRCUIT
BREAKER
3T-2662
1
PANEL LAMPS/ GAUGES
165-YL
126-PK
FAN GPS
101-RD-14
T
C001
C002
C003
C004
C005
C006 C007
C008
C009
C011
C010
C012
C013
C014
C015
C016
D24737
CATERPILLAR
MONITORING
SYSTEM
TRANSMISSION
/GRAPPLE
CONTROL
KEY START
SW
GND
GY
GN
GROUND CIRCUIT.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY START SWITCH IS OFF.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY START SWITCH IS ON.
STARTING CIRCUIT.
CATERPILLAR MONITORING CIRCUIT.
WIPER/WASHER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
ENGINE SHUTDOWN CIRCUIT.
DIFFERENTIAL LOCK CIRCUIT.
PANEL LAMP CIRCUIT.
TRANSMISSION CIRCUIT
OF TRANSMISSION/GRAPPLE CONTROL.
GRAPPLE CIRCUIT
OF TRANSMISSION GRAPPLE CONTROL.
ALL DASHED LINES ARE ATTACHMENTS.
START AID CIRCUIT.
9
8
7
9
8 7
6 5
4
3 2 1
6 5 4 3 2
1
F
E
D
C
B
A
F
E
D
C
B
A