SENR4731 January 1990
21 4 6 2
9
1 16 13
C
24 23
19
25 17
2
6
10
Part No.
20
8
3
22
B
7
Off Machine Switch Specification
5
27
11
Actuate
Deactuate
Contact Position
45kPaMAX (6.5 psi MAX)
5kPaMIN (0.5 psi MIN)
NO.
MAX HYD 3l03kPa MAX BYPASS SPOOL
FORCE 66.7 N MAX ACT 8.9 N
N.O.
2M9346
Stop Lamp (Pressure)
3T9343
Power Train Filter Pressure (EMS)
7N9560
Power Train Oil Temperature (EMS)
129.4 ± 2.8°C (265 ± 5°F)
118.3°C MIN (245°F MIN)
N.C.
7N9785
Engine Coolant Temperature (EMS)
107.2 ± 2.8°C (225 ± 5°F)
91 .0°C MIN (196°F MIN)
NC.
7T2078
Primary Steering Flow (EMS)
11 I/mm MAX (25.4 mm ID line)
4.9 1/mm MIN (25.4 mm ID line)
NO.
7T0988
Engine Oil Pressure (EMS) Engine Oil Pressure (S. Meter)
62 ± 21 kPa (9.0 ± 3.0 psi)
38 ± 21 kPa (5.0 ± 3.0 psi)
NO.
8N1693
Engine Coolant Temperature (Start Aid)
37.8 ± 2.8°C (100 ± 5°F)
26.7°C MIN (80°F MIN)
N.C.
8N2248
Hydraulic Oil Temperature (EMS)
101.7 ± 2.8°C (215 ± 5°F)
93.3°C MIN (200°F MIN)
NC.
9G3341
Power Train Filter Temperature (EMS)
51.7 ± 2.8°C (125 ± 5°F)
43.0°C MIN (110°F MIN)
N.C.
9G8009
Parking Brake Pressure (EMS) Brake Air Pressure (EMS)
517 ± 35 kPa (75.0 ± 5.0 psi)
448 ± 35 kPa (65.0 ± 5.0 psi)
NO.
9W3187
Fuel Pressure (EMS)
93 ± 21 kPa (13.5 ± 3.0 psi)
69 ± 21 kPa (10.0 ± 3.0 psi)
N.C.
D
10
15 18
Function
7
9 12
4
8
1
A
5 3
26
14
824C Tractor & 825C Compactor Electrical System
NO. — Normally Open.
85X1194-UP 86X731-UP
N.C. — Normally Closed.
D
3
16
6
C
15
25 22 24 23
13
1 3
10
1
11 7
26
8
2
9
6
A
B
4
5 8
21
19
17
2
18
7
20
5
27
14
10
12
9
4
Vehicle Harness Connector and Component Locations
©1990 Caterpillar All Rights Reserved
Component Alarm - Backup
Schematic Location G-12
Component Location Machine Location 1
Connector Location Component
Solenoid - Start Aid
Schematic Location C-10
Machine Location 18
Alarm - Fault (EMS)
B-4
A
Switch - Aux Flood Lamp
D-7
A
Alternator
B-12
2
Switch - Backup Alarm
D-10
19
Battery
A-12
3
Switch - Blower Speed
F-7
B
Battery
E-12
4
Switch - Brake Air Press (EMS)
E-2
20
Breaker - Alternator (60 Amp)
F-11
C
Switch - Brake Oil (EMS) (825C)
E-2
21
Breaker - Blower (15 Amp)
B-5
5
Switch - Brake Oil Front (EMS) (824C)
F-2
21
Breaker - Engine Shutdown (15 Amp)
F-11
C
Switch - Brake Oil Rear (EMS) (824C)
F-2
21
Breaker - Running Lamp (15 Amp)
F-11
C
Switch - Disconnect
A-12
10
Control - Engine Shutdown
F-12
6
Switch - Engine Coolant Temp (EMS)
C-12
22
Gauge - Engine Coolant Temp
D-4
A
Switch - Engine Coolant Temp (Start Aid)
C-11
23
Gauge - Hydraulic Temp
D-5
A
Switch - Engine Oil Press (EMS)
D-12
24
Gauge - Powertrain Temp
D-5
A
Switch - Engine Oil Press (Service Meter)
D-12
24
Lamp - Master Fault (EMS)
C-5
A
Switch - Front Wiper
D-8
A
Meter - Service
D-6
A
Switch - Fuel Press (EMS)
B-12
25
Monitor - Operator (EMS)
D-7
A
Switch - Heater/AC Selector
F-7
B
Motor - Blower (LH)
E-9
7
Switch - Hydraulic Temp (EMS)
B-2
14
Motor - Blower (RH)
C-9
8
Switch - Key
C-6
A
Motor - Front Washer
E-8
D
Switch - Operator Monitor (EMS) Test
D-9
A
Motor - Front Wiper
E-4
D
Switch - Parking Brake Press (EMS)
D-2
20
Motor - Rear Washer
E-8
D
Switch - Power Train Temp (EMS)
D-11
24
Motor - Rear Wiper
E-7
D
Switch - Powertrain Filter Press (EMS)
B-2
26
Motor - Starter
B-11
9
Switch - Powertrain Filter Temp (EMS)
B-3
26
Receptacle - Aux Start
A-11
10
Switch - Primary Steering Flow (EMS)
A-10
27
Relay - Main
F-11
C
Switch - Rear Flood Lamp
D-7
A
Relay - Start
F-10
C
Switch - Rear Wiper
C-8
A
Resistor - Blower Speed
D-9
11
Switch - Refrigerant Press (AC)
A-6
8
Resistor - Starter/Diagnostic Conn
B-11
12
Switch - Running Lamp
C-7
A
Sender - Engine Coolant Temp (Gauge)
C-11
13
Switch - Start Aid
D-6
A
Sender - Hydraulic Temp (Gauge)
B-2
14
Switch - Stop Lamp Press
F-2
21
Sender - Power Train Temp (Gauge)
D-11
15
Switch - Thermostat
F-7
B
Solenoid - AC Clutch
C-12
16
Switch - Transmission Neutral
D-9
19
Solenoid - Engine Shutdown
C-11
17
A = Components in operator compartment - Right console.
C = Components on relay panel.
B = Components In operator compartment - Left console.
D = Components in operator compartment.
Connector 37 CONTACTS
Machine Location 1
2
25 CONTACTS
Harness And/Or Components
Schematic Location
H - 6W4239 B - 6W7320
B-9
H - 6W4239 UU - 6W5176
D-11
Connector
Machine Location 7
6 CONTACTS
4
3 3
H - 6W4239 ZZ - 6W5177
F-10
8
*
B - 6W7320 Operator Monitor (EMS)
D-7
7
ZZ - 6W5177 Diagnostic Connector
E-11
20 CONTACTS 3 3
5 CONTACTS 9
Harness And/Or Components
Schematic Location
B - 6W7320 F - 6W7417
D-4
B - 6W7320 K - 6W8243
A-7
H - 6W4239 Q - 6W5078
F-2
B - 6W7320 E - 6W7415
D-4
H - 6W4239 M - 6W5209
E-12
H - 6W4239 B - 6W7320
B-9
*
B - 6W7320 Front Wiper Motor
E-4
A - 6W7363 B - 6W7320
B-8
7
B - 6W7320 Not Used
B-4
4
A - 6W7363 B - 6W7320
B-8
*
E - 6W7415 Rear Wiper Motor
E-7
9 CONTACTS
4
A - 6W7363 B - 6W7320
B-7
8
G - 6W5079 H - 6W4239
E-3
8 CONTACTS
4
B - 6W7320 C - 6W7411
B-6
10
H - 6W4239 L - 6W8227
D-9
A - 6W7363 C - 6W7411
C-6
H - 6W4239 Not Used
F-10
12 CONTACTS
1
4
10 CONTACTS
4
4 CONTACTS
5
G - 6W5079 H - 6W4239
*
H - 6W4239 Engine Shutdown Control
F-12
J - 6W8226 K - 6W8243
F-8
7 CONTACTS
F-2
3
Wire Number
Wire Color
101
RD
102
Wire Description Wire Number
Wire Color
BATTERY
411
PK
OPR MON MASTER FAULT LAMP
BU
HEAD LAMP
413
BR
OPR MON FUEL PRESS.
105
BR
KEY SW
415
GN
OPR MON TEST SW
107
WH
ENG SHUT-DOWN/AUTO FIRE SUPPR CO NT
416
OR
SUPPL STER SW
109
OR
ALTERNATOR OUTPUT (+) TERM.
417
GY
PRIMARY STER SW
112
PU
MAIN POWER RELAY OUTPUT
419
YL
OPR MON PARKING BRAKE
113
OR
OPR MON PANEL/VMIS B+ SWITCHED
424
GY
OPR MON POWER TRAIN TEMP
116
BR
AUX CKT
426
BR
OPR MON POWER TRAIN OIL FILTER
118
GY
AUX CKT
432
PK
OPR MON BRAKE PRESS. (OIL)
119
PK
AUX CKT
433
BU
OPR MON BRAKE PRESS. (OIL) JUMPER
121
YL
BACKUP ALARM/LAMP
441
OR
ENG COOLANT TEMP GAGE
123
WH
AUX CKT
442
GY
HYD SYSTEM TEMP GAGE
124
GN
A/C
443
YL
POWER TRAIN TEMP GAG
127
OR
AUX CKT
453
PK
SUPPL STER FAULT LAM
128
PK
AUX CKT
129
BU
AUX CKT
500
BR
WIPER - FRONT (PARK)
136
GN
SUPPL STER
501
GN
WIPER - FRONT (LO)
148
WH
AUX CKT
502
OR
WIPER - FRONT (HI)
158
BR
AUX CKT
503
BR
WIPER - REAR (PARK)
504
YL
WIPER - REAR (LO)
Description Power Circuits
Ground Circuits
Description Monitoring Circuits (Continued)
Accessory Circuits
200
BK
MAIN CHASSIS
505
BU
WIPER - REAR (HI)
201
BK
OPR MON PANEL/VMIS/CMS
506
PU
WASHER-FRONT
Vehicle locations are repeated for connectors located close together.
203
BK
507
WH
* = Connector is located at the component.
CHASSIS DIAGNOSTIC
WASHER-REAR
207
BK
STARTER DIAGNOSTIC
513
OR
A/C COMPRESSOR/REFRIGERANT PRESS. SW
514
PU
A/C CONDENSER MOTOR
6
Basic Machine Circuits 301
BU
STARTER NO.1 SOL
515
GY
BLOWER MOTOR (HI)
302
OR
STARTER NO.1 RESISTOR TO DIAGNOSTIC
516
GN
BLOWER MOTOR (MEDIUM)
304
WH
STARTER RELAY NO.1 OUTPUT
517
BU
BLOWER MOTOR (LO)
306
GN
STARTER RELAY COIL TO NEUT STAR.T SW OR KEY SW
521
YL
A/C SW TO REFRIGERANT SW
308
YL
MAIN POWER RELAY COIL
522
WH
A/C CLUTCH TO THERMOSTAT SW
310
PU
START AID SW TO START AID SOL
567
WH
A/C SW JUMPER
311
WH
START AID SOL TO TEMP SW
321
BR
BACKUP ALARM/LAMP/TRAVEL ALARM
603
PK
ROTARY BEACON
326
PU
KEY SW "C" TERM.
604
OR
STOP LAMP
327
PK
SHUTDOWN SOL
607
PK
FLOOD LAMP. FRONT
608
GN
FLOOD LAMP- REAR
Monitoring Circuits
Lighting Circuits
400
GN
SERVICE METER SW
614
PU
PARK/TAIL/DASH LAMP
403
GN
ALTERNATOR (R) TERM.
615
YL
CAB FLOOD LAMP/ROPS
404
YL
OPR MON HYD OIL TEMP
617
BR
TAIL/POSITION LAMP- LEFT (ROAD PKG)/WIDTH
405
GY
OPR MON OIL PRESS. (LO SETTING)
618
YL
TAIL/POSITION LAMP- RIGHT (ROAD PKG)/WIDTH
406
PU
OPR MON COOLANT TEMP
621
GY
FLOOD LAMP INDICATOR LAMP
408
WH
OPR MON BRAKE PRESS. (AIR)
409
OR
OPR MON NEUT
761
GY
LIFT KICKOUT SOL SW
410
WH
OPR MON FAULT ALARM
762
YL
BUCKET POSITIONER SOL SW
Control Circuits
Printed in U.S.A.