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.
KENR2856
December 1995
CB-634C Vibratory Compactor
Electrical System
3BR1-UP
©
1995 Caterpillar
All Rights Reserved
Printed in U.S.A.
11
13
21
19
33
4
5
3
34
2
1
6
7
28
26
30
40
181-GY
1
200-BK
2345678910 11 12
8765432
29
406-PU
27
23
8
15
14
17
36
35
32
A919-BU
1
2
C926-BU
C924-YL
200-BK
200-BK
P44R44
1
2
C925-GN
B
A
P20
R20
P19
R19
1 2
127-9815
P23R23
VIB
CONTROL
VIB
CONTROL
P22
1 2
1
2
109-5584
5Y-1423
9S-0174
9W-3043
4D-6565
106-0800
101-8929
3E-0075
3T-57603T-5760
108-0405
3P-2181
109-2249
114-4308
6T-3670
3E-7382
B439-RD
9X-4381
7T-0969
9X-4381
7T-7743
103-4977
107-0611
3E-6451
117-5673
6T-7337
117-5674
2N-2371/
2V-7087
C924-YL
9G-7641
105-3542
105-3542
7T-0969
105-3542
120-3964
3T-2357
3E-5239
1V-6653
3E-5239
5E-8006
31
400-GN
3K-1650
1V-6652
101-7740
3T-8728
3E-5239
3E-5239
3E-5239
3E-5239
3E-5239
3E-5239
20
751-GN
C925-GN
751-GN
777-PU
200-BK
C923-OR
C927-PU
608-GN
321-BR
B440-RD
449-RD
276-BK
326-PU
123-WH
-- -+++
SIGSIGSIG
400-GN
A919-BU
A920-BR
A983-BU
9X-4381
119-9527
309-GY
306-GN
C925-GN
C924-YL
C926-BU
777-PU
R3
C922-BR
405-GY
C927-PU
C926-BU
428-OR
C931-OR
109-OR-6
BK-00
MOTOR
2
1
P31
S
MTRBAT
MOTOR
CABLE AS.
RD-00
CABLE AS.
P21
POS NEG POS NEG
T
STARTER
MOTOR
HYD
TEMP SW
DISCONNECT SW
60
465-OR
GROUND
SPEED
TA CH
FUEL
GAUGE
HOUR
METER
FUEL
SENDER
400-GN
+
-
A
1
2
400-G
N
449-RD
200-BK
608-GN
BC
ENGINE OIL
PRESS.SW
307-OR
10 10
15
10
UNUSED
10
123-WH
10
200-BK
112-PU-6
200-BK
109-OR-6
109-OR-6
R9
308-YL
121-YL
109-OR
ST
ON
OFF
R
C
S
B
308-YL
IGNITION
SWITCH
C928-GY
C729-BU
155-PK
103-YL
C929-WH
C730-BR
173-YL
175-PK
322-GY
123-WH
103-YL
110-GN-14
449-RD
1
2
3
4
5
6
176-YL
321-BR 321-BR321-BR
608-GN 608-GN
400-GN
173-YL
200-BK
C923-OR
200-BK
200-BK
110-GN-14
112-PU-6
155-PK
176-YL
R28
304-WH-6
306-GN
200-BK
101-RD-6
121-YL
STARTER
RELAY
ALT
BREAKER
106-0543
WORKING LAMP GP
18-BK
18-WH
C922-BR
HOUR METER
PRESS.SW
1
MOTOR
200-BK
322-GY
TO
ENGINE
BLOCK
200-BK-12
WORKING LAMP GP
WARNING HORN
BACKUP ALARM
REAR
VIB SENSOR
REAR SPEED
SENSOR
BATTERY
BATTERY
TO
FRAME
200-BK-12
BK-00
BK-00
CABLE AS.
CABLE AS.
1
2
16
38
R29
P29
R30
P30
R12 P12
R13 P13
R15
GND
FRAME
WORKING LAMP GP
WORKING LAMP GP
P15
ALTERNATOR
ALT
+
R
200-BK
R21
12
JUMP STUD
BK-00
CABLE AS
R31
P44
200-BK
200-BK
200-BK
200-BK
C922-BR
200-BK
B439-RD
B439-RD
1
2
200-BK
309-GY
200-BK
635-BRF
E
D
C
B
A
C930-BR
C932-YL
200-BK
B438-OR
614-PU
FUNCTIONAL
LIGHT
CLUSTER
635-BR
614-PU
B438-OR
18-BK
C930-BR
C932-YL
220-BK
221-BK
ENGINE COOLANT
TEMP SW
T
465-OR
326-PU
200-BK
FUEL
SHUT- OFF
SOLENOID
P17
R17
105-BR
376-GN
B440-RD
449-RD
447-PK
307-OR
309-GY
308-YL
376-GN
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
308-YL
307-OR
447-PK
309-GY
449-WH
376-GN
B440-WH
C932-YL
C930-BR
B438-OR
614-PU
635-BR
A982-BR
181-GY
105-BR
200-BK
105-BR
465-OR
123-WH
200-BK
200-BK
112-PU-6
P4
109-OR-6
308-YL
608-GN
619-GN
614-PU
173-YL
635-BR
606-GY
605-YL
109-OR-6
221-BK
C929-WH
C928-GY
C729-B
U
P14
R14
C730-BR
C928-GY
C929-WH
C730-BR
C922-BR
B439-RD
619-GN
605-YL
606-GY
619-GN
C
18-WH
R18
614-PU
87
P18
654321
322-GY
C729-B
U
P8
37
B
C923-OR
221-BK
220-BK
A983-BU
C730-BR
12
606-GY
619-GN
614-PU
200-BK
C729-B
U
3
CABLE AS
.
RD-00
4
5Y-1423
5 6
C928-GY
109-OR-6
109-OR-6
A920-BR
619-GN
619-GN
619-GN
322-GY
B440-RD
123-WH123-WH
B440-RD
605-YL
200-BK
GND
FRAME
BK
WH
C929-WH
C923-OR
608-GN
200-BK
7N-0718
A919-BU
INT
RELAY
B438-OR
1
2
3
TIMER
2
RD
123-WH
FRONT/REAR
SPRAY
SWITCH
3
110-GN
C935-PU
A
C922-BR
C936-GY
200-BK-12
C923-OR
1
52
4
387a
8730
200-BK
C937-WH
1
B438-OR
5
2
6
4
3
WATER
SPRAY
SWITCH
1
2
226-BK
200-BK
447-PK
ABBREV
RD
WH
OR
YL
PK
BK
GY
PU
BR
GN
BU
COLOR
RED
WHITE
ORANGE
YELLOW
PINK
BLACK
GRAY
PURPLE
BROWN
GREEN
BLUE
SYMBOL DESCRIPTION
200-BK
BLADE, SPADE, RING
OR SCREW TERMINAL
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ELECTRICAL CONNECTION
TO VEHICLE STRUCTURE
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
CONNECTOR
ATCH WIRE, CABLE,
COMPONENT
CIRCUIT GROUPING
DESIGNATION
SHIELD
1
2 3
400-GN
123-WH
200-BK
4 5 6 7
4W-2141
1V-6653
4D-1836
4D-1836
3E-5239
3E-5239
8D-2676
3E-5239
24
8
R16
UNUSED
109-OR-6
123-WH
200-BK
181-GY
A982-BR
A953-PK
110-GN-14
176-YL
175-PK
751-GN
C BLK
BWHT
A RED
+AUX
+HOT
-GND
173-YL
103-YL
155-PK
121-YL
400-GN
301-BU-10
SOLINOID B
SOLENOID A
608-GN
200-BK
112-PU-6
R
H
T- D
B
C2
114-GN-12
31
30B
49A
C
49
321-BR
322-GY
155-PK
B439-RD
B440-RD
308-YL
121-YL
C932-YL
C924-YL
103-YL
C926-BU
326-PU
777-PU
C927-PU
307-OR
C925-GN
306-GN
447-PK
226-BK
326-PU
614-PU
326-PU
465-OR
MAIN
RELAY
606-GY
605-YL
619-GN
221-BK
604-OR
537-GN
20
UNUSED (BRAKE LIGHT)
604-OR
220-BK
18
12
751-GN
C932-YL
C934-BU
751-GN
4
6
3
1
5
2
B440-GN
C925-GN
B921-WH
AUTO/MAN.
SWITCH
39
C924-YL
307-OR
B439-RD
103-YL
306-GN
TURN
SWITCH
155-PK
C932-YL
B440-RD
DRUM
SELECT
SWITCH
2
326-PU
308-YL
UNUSED
308-YL
326-PU
2
3
1
B920-GN
1
C927-PU
C926-BU
3
3
12
LOW/HIGH
AMP.
SWITCH
10
22
C933-GN
1
52
4
3
87
87a
30
NEUTRAL
START
RELAY #1
25
NEUT START
155-PK
330-YL
103-YL
9
C932-YL
PA RT OF VALVE GP
AUTO-VIB
SWITCH
(REV)
AUTO-VIB
SWITCH
(FWD)
C925-GN
C934-BU
C924-YL
777-PU
777-PU
330-YL
330-YL
DIAGNOSTIC
LIGHT
CLUSTER
C931-OR
777-PU
1
200-BK
428-OR
200-BK
405-GY
24
B765-BR
200-BK
7 8 6 1 4 2 3 5 9 10 11 12
419-YL
200-BK
NEUTRAL
START
RELAY #2
777-PU
BRAKE
RELAY #1
BRAKE
RELAY #2
1
52
614-PU
123-WH
123-WH
123-WH
614-PU
447-PK
B440-WH
4
3
87
87a
30
R10
200-BK
200-BK
200-BK
37
38
16
20
31
200-BK
32
35
36
17
14
15
8
200-BK
23
WARNING
HORN
SWITCH
27
29
40
30
2 SPEED
SWITCH
26
28
7
6
1
2
34
3
A982-BR
B920-GN
B921-WH
5
9
25
4
R4
326-PU
P24
CBA
C933-GN
876
C933-GN
C933-GN
54
7 8 6 1 4 2 3 5 9 10 11 12
22
10
39
R10
3
P27
155-PK
2
330-YL
103-YL
C932-YL
C934-B
U
406-PU
123-WH
C931-OR
428-OR
405-GYF
E
200-BK
P10
322-GY
C730-BR
C929-WH
200-BK
15
D
-
C
B
+
322-GY
606-GY
173-YL
619-GN
614-PU
608-GN
605-YL
4
308-YL
635-BR
2
C729-BU
C928-GY
181-GY
A983-BU
A
A920-BR
FUNCTIONAL
LIGHT
RELAY
HYD
TEMP
RELAY
WARNING
LIGHT
RELAY
UNUSED
221-BK
406-PU
A982-BR
200-BK
COOLANT
TEMP
RELAY
ENGINE OIL
PRESS.
RELAY
465-OR
220-BK
276-BK
87a
87
3
4
2
5
1
30
R25
P25
UNUSED
30
1
5
2
4
3
87
87a
87
3
4
2
5
1
30
30
1
5
2
4
3
87
87a
87a
87
3
4
405-GY
C931-OR
428-OR
2
200-BK
226-BK
C938-BR
377-OR
376-GN
5
1
30
123-WH
LIGHT
BREAKER
3
LIGHT
SWITCH
1
110-GN
C922-BR
B438-OR
C923-OR
C930-BR
HYD CHARGE
OIL PRESS.
RELAY
C938-BR
C930-BR
30
1
5
2
4
3
87
87a
87a
112-PU-6
A919-BU
112-PU-6
109-OR-6
A919-BU
A982-BR
200-BK
A920-BR
123-WH
33
19
A983-BU
181-GY
2
321-BR
C926-BU
C927-PU
WARNING
HORN
C922-BR
777-PU
C924-YL
C925-GN
BK
306-GN
309-GY
200-BK
RD
A983-BU
WH
P2
121-YL
BK
A920-BR
400-GN
1
105-BR
112-PU-6
21
405-GY
406-PU
221-BK
MAIN
RELAY
118-3534
R33
P33
1
1
R11
2
P11
R3
109-OR
1
C938-BR
123-WH
428-OR
604-OR
RD
HYD OIL
PRESS.SW
326-PU
C720-BU
400-GN
148-WH
12
465-OR
DIODE AS.
P26
568-GN
P7P6
12
112-PU-6
112-PU-6
2
400-GN
DIODE AS.
DIODE AS.
R1
30
87a
87
3
200-BK
B439-RD
321-BR
4
34
C930-BR
2
123-WH
449-RD
5
5
B440-RD
321-BR
608-GN
377-OR
C923-OR
123-WH
200-BK
1
376-GN
377-OR
C938-BR
P3
428-OR
226-BK
604-OR
200-BK
405-GY
200-BK
WH
751-GN
406-PU
P9
INDICATOR
LAMP
11
428-OR
C931-OR
405-GY
276-BK
220-BK
465-OR
UNUSED
C938-BR
10
276-BK
400-GN
R2P1
1
11
10
406-PU
221-BK
200-BK
200-BK
200-BK
SHIELD
5
406-PU
B440-RD
C928-GY
C929-WH
C729-BU
C730-BR
175-PK
2
UNUSED
322-GY
13
11
176-YL
123-WH
449-RD
R44
200-BK
105-BR
6
VIB SELECTOR VALV E
5
4
3
2
1
C927-PU
326-PU
R22
200-BK
4
3
12
87
200-BK
9
SHIELD
18
87a
30
6
SHEILD
7
P5
8 9 10
UNUSED
121-YL
FRONT
VIB SENSOR
106-0543
FRONT
WATER PUMP
128-8625
FRONT HARNESS
120-4219
REAR
HARNESS
120-4218
THROTTLE
CONTROL
SOLENOID
125-5011
UNUSED
2 SPEED BRAKE
112-7040
B C A
UNUSED
REAR
WATER PUMP
128-8625
UNUSED
ENGINE HARNESS
117-0403
VIB
TA CH
108-4865
11
BRAKE
FUSE
3K-8782
12
9
VIBRATION
FUSE
3K-8782
WATER
SPRAY
FUSE
8M-8948
BACKUP
ALARM
FUSE
3K-8782
155-PK155-PK
200-BK
604-OR
R24
GAUGES/
SPEED SENSOR
FUSE
3K-8782
KEY
START
FUSE
3K-8782
THROTTLE
CONTROL
SWITCH
8D-2676
INSTRUMENT
HARNESS
124-9658
DUAL AMPLITUDE
HARNESS
120-8868
BACKUP
ALARM
PRESS SW
9D-7032
BRAKE
SWITCH
116-5275
122-7344
116-6565
UNUSED
UNUSED
THROTTLE
CONTROL
SWITCH
125-5011
THROTTLE
CONTROL
BREAKER
6N-8589
4D-1836
MAIN HARNESS 124-9659
2
5
3
55
222
3
2
6 7
8
2
3
2
3
3 3 2
Electrical Schematic
119-3963
5
VIB ON/OFF
3
2
d39130
CONNECT THIS WIRE WHEN
3 AMPLITUDE OPTION
IS USED
3
REMOVE THIS SWITCH
WHEN 3 AMPLITUDE
OPTION IS USED
3
88
4
1
10
1111
11
17
14
13
15
18
19 20
21
24
26
28
29
30
25
22
12
9
23
27
16
16
3 5 1 4
7 6
8
2
d39131
30
28
10
25
22 29 23 21 20 15
14 19 24
16
26
27
13
17
12 11
18 9
6
7
13
1
Item
Component
2
3
4
5
6
7
8
No.
Control Console Support
Instrument Panel
Control Console
Warning System Diodes
Rear Vibratory Sensor
Coolant Temperature Switch
Service Meter And Oil Pressure Switches
Governor Speed Control Solenoid
Hydraulic Temperature Switch
Rear Speed Sensor
9
10
Front Lamp Group
Warning Horn
11
12
13
14
15
19
20
21
18
16
17
22
23
24
25
26
27
28
29
30
Vibratory Control Switch
d39084
Rear Lamp Group
Backup Alarm
Front Vibratory Sensor
Fuel Level Sender
Hydraulic Oil Pressure Switch
Governor Speed Control Circuit Breaker
Rear Water Spray Motor
Front Water Spray Motor
Vibratory Control Solenoids
Propel Speed Range And Brake Solenoids
Fuel Shutoff Solenoid
Front/Rear Drum Vibratory Control Solenoids
Disconnect Switch
Battery
Alternator Circuit Breaker
Starter Relay
Starter And Solenoid