325 & 325L EXCAVATORS ELECTRICAL SYSTEM SCHEMATIC USED IN SERVICE MANUALSENR5400

SENR6239
June 1994
325 & 325L Excavators
Electrical System
325:
8NL1-UP
6RM1-UP
325L:
9KLM1-UP
7LM1-UP
©
1994 Caterpillar
All Rights Reserved
Printed in U.S.A.
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
Area E
Area F
3
4
5
6
1
2
1
2
3
4
1
3
1
2
3
4
1
1
2
3
1
4
3
5
Area H
Area G
Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
Actuator- Governor B-15 1 Sensor- Speed C-15 19
Alarm - Action E-2 3A Solenoid - Air Conditioner Compress Clutch E-15 20
Alarm - Travel E-14 2 Solenoid - Creeper Speed Control B14,15 46
Alternator D-14 3 Solenoid- Engine Stop D-15 21
Antenna E-11,12 4 Solenoid - Fine Swing C-6 22
Battery A-2 5 Solenoid - Hammer Control D-5 23
Block - Terminal B-4 1D Solenoid - Level B-12 1H
Breaker A-9 5D Solenoid - Start Aid F-13 25
Controller B-10 6 Solenoid - Travel Speed A-12 3H
Converter E-12 7 Solenoid - Trenching A-12 2H
Dial - Engine Speed E-5 3B Speaker D-11 28
Fuse - Block B-6, 7, 9 7D Switch - Aux Hydraulic Press E-2 29
Horn C-2, D-2 8 Switch - Boom Raise Press D-12 3G
Lamp - Boom C-1,D-1 9 Switch - Creeper Speed Control F-7 6C
Lamp - Cab E-1, F-1 43 Switch - Disconnect A-3 6D
Lamp - Chassis C-2 10 Switch - Engine Oil Press D-15 31
Lamp - Dome E-11 42 Switch - Fine Swing Control F-7 4C
Lighter - Cigar E-3 1A Switch - Governor Backup E-9 7B
Meter - Service E-2 2A Switch - Hammer Control E-7 5B
Monitor E-2 4A Switch - Horn F-5 3C
Motor - Lower Wiper E-2 11 Switch - Implement Swing Press D-12 1G
Motor-Starter C-14 12 Switch-Low Idle E-5 2B
Motor - Washer F-13 13 Switch - Lower Washer D-7 8B
Motor - Wiper F-2 14 Switch - Lower Wiper E-7 9B
Pump - Refueling F-14 15 Switch - Neutral Start F-3 33
Relay - Boom Lamp A-7 8D Switch - Pump Backup F-8 2C
Relay - Chassis/Cab Lamp A-9 8D Switch - Radio Control F-7 7C
Relay - Fine Swing A-9 8D Switch - Refrigerant Low Press E-15 34
Relay - Horn B-6 8D Switch - Refueling E-13 35
Relay - Main B-9 4D Switch - Refueling Pump F-14 36
Relay - Refueling Pump A-6 8D Switch - Seat Heater F-7 5C
Relay - Starter B-7 3D Switch - Speed Change E-8 6B
Relay - Washer B-7 8D Switch - Starter E-6 1B
Relay - Wiper B-9 8D Switch - Start Aid E-5 4B
Resistor C-6 2D Switch - Start Aid Coolant Temperature D-14 37
Resistor - Backup F-9 1C Switch - Travel Press F-2 47
Seat With Seat Heater F-10 45 Tuner E-11 39
Sensor - Engine Coolant Temperature E-14 16 Unit - Air Conditioner F-11 40
Sensor - Fuel Level F-13 1F Unit - Heater F-10 44
Sensor - Hydraulic Oil Temperature A-11 5H Valve - Proportional Reducing A-12 4H
A
3
4
5
6
8
9
10
11
12
14
15
13
16
B
C
D
E
1
2
19
20
21
22
23
25
28
29
31
37
35
33
34
36
7
F
39
40
42
43
44
45
47
G
H
28
47
43
8
9
31
35
3
4
5
6
7
38
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
36
34
40
39
37
32
33
A
3
4
5
6
8
9
10
11
12
14
15
13
16
B
C
D
E
1
2
19
20
21
22
23
25
28
31
37
35
33
34
36
7
F
39
40
42
43
44
45
46
47
46
G
H
33
35
3
4
5
6
7
38
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
31
32
34
39
40
36
37
Machine Harness Connector And Component Locations
3250507
1
2
3
4
Area A
1
2
3
4
5
7
8
9
Area B
3
4
5
6
8
1
2
7
3
4
9
1
2
Area C
Area D
1
2
3
4
5
6
7
8
9
5
4
3
1
3
4
5
6
8
1
2
7
3
4
5
6
1
2
7
3250511
3250508
3250478
3300158
Connectors
Connector
No. And
Machine
Location
Harness And/or
Components
Schematic
Location
Connectors
Connector
No. And
Machine
Location
Harness And/or
Components
Schematic
Location
40 Contacts
CONN 1
*
RR-105-9997
Controller
A-10
CONN 32
G-5I-8217
Wiper Motor
F-2
24 Contacts
CONN 2
*
RR-105-9997
Controller
B-10
CONN 12
F-51-8216
U-7Y-8105
E-12
CONN 9
E
A-106-0025
RR-105-9997
D-4
CONN 28
A-106-0025
C-105-9948
F-4
CONN 10 A-106-0025
RR-105-9997
D-4
CONN 25
A-106-0025
H-5I-8215
E-6
CONN 11 A-106-0025
RR-105-9997
D-4
CONN 46
RR-105-9997
Engine Coolant Temperature Sensor
E-14
CONN 8 A-106-0025
RR-105-9997
D-5
CONN 41
D-7Y-8113
Engine Oil Press Switch
D-15
CONN 13 A-106-0025
F-5I-8216
E-10
CONN 21
J-7Y-3921
Lower Wiper Switch
E-7
CONN 24 A-106-0025
H-5I-8215
E-6
CONN 69
U-7Y-8105
Converter
E-12
CONN 18 A-106-0025
J-7Y-3921
E-9
CONN 78
T-7Y-8139
Speaker
D-11
CONN 17 A-106-0025
L-102-7902
F-9
CONN 79
SS-5I-8376
Speaker
D-11
CONN 50 RR-105-9997
C-105-9948
D-13
CONN 25A
A-106-0025
MM-5I-8374
E-6
CONN 6 RR-105-9997
M-105-9944
C-3
CONN 25B
H-5I-8215
MM-5I-8374
E-6
CONN 5 RR-105-9997
M-105-9944
C-4
CONN 29
A-106-0025
Aux Hydraulic Press Switch
E-2
CONN 4 RR-105-9997
M-105-9944
C-4
CONN 23
A-106-0025
K-7Y-3868
F-6
9 Contacts
CONN 67 T-7Y-8139
Tuner
E-11
CONN 7
A-106-0025
S-7Y-5508
D-5
CONN 14 A-106-0025
E-111-4712
E-10
CONN 70
A-106-0025
Seat With Seat Heater
F-10
CONN 43 RR-105-9997
D-7Y-8113
B-15
CONN 59
AR-105-9997
Boom Raise Press Switch
D-12
CONN 3 RR-105-9997
M-105-9944
C-5
CONN 56
RR-105-9997
Proportional Reducing Valve
A-12
6 Contacts
CONN 34
F-5I-8216
G-5I-8217
E-1
CONN 52
RA-105-9997
Implement Swing Press Switch
D-12
CONN 15
A-106-0025
Air Conditioner Unit
F-11
CONN 53
RR-105-9997
Level Solenoid
B-12
CONN 15
A-106-0025
Heater Unit
F-10
CONN 38
AR-105-9997
P-7Y-3887
D-2
CONN 19
A-106-0025
J-7Y-3921
D-9
CONN 47
RR-105-9997
Start Aid Coolant Temperature Switch
D-14
CONN 44
AR-105-9997
Governor Actuator
A-15
CONN 51
A-106-0025
Travel Press Switch
F-2
CONN 27
H-5I-8215
Engine Speed Dial
E-5
CONN 55
AR-105-9997
Travel Speed Solenoid
A-12
CONN 33
A-106-0025
Lower Wiper Motor
E-2
CONN 54
RR-105-9997
Trenching Solenoid
A-12
CONN 58
RR-105-9997
RR-105-9997
A-10
CONN 63
RR-105-9997
X-7Y-8108
C-6
CONN 30
E-111-4712
Monitor
E-2
CONN 71
RR-105-9997
Y-51-8249
A-15
CONN 12
F-5l-8216
T-7Y-8139
D-11
CONN 49
C-105-9948
Fuel Level Sensor
F-13
CONN 39
C-105-9948
Refrigerant Low Press Switch
E-15
CONN 37
S-7Y-5508
Hammer Control Solenoid
D-5
CONN 48
C-105-9948
Start Aid Solenoid
F-13
CONN 68
U-7Y-8105
Converter
E-12
CONN 45
Cc105-9948
Travel Alarm
E-14
CONN 65
W-7V-3855
Refueling Pump
F-14
CONN 66
C-105-9948
W-7Y-3855
E-14
CONN 64
W-7Y-3855
Refueling Pump Switch
F-14
CONN 40
Air Conditioner Compress Clutch
Solenoid
E-15
CONN 62
X-7Y-8108
Fine Swing Solenoid
C-6
CONN 42
D-7Y-8113
Speed Sensor
C-15
CONN 72
Y-5I-8249
Creeper Speed Control Solenoid
A-15
CONN 31
E-111-4712
Action Alarm
E-2
CONN 73
Y-5I-8249
Creeper Speed Control Solenoid
A-15
CONN 36
F-5I-8216
N-7Y-8245
E-1
CONN 76
LL-5I-8373
Fine Swing Control Switch
F-7
CONN 35
F-5l-8216
N-7Y-8245
F-1
CONN 83
A-106-0025
RR-105-9997
D-3
CONN 26
H-5I-8215
Start Aid Switch
E-5
CONN 80
A-106-0025
TT-106-0026
F-8
CONN 22
J-7Y-3921
Lower Washer Switch
E-7
CONN 81
TT-106-0026
Radio Control Switch
F-8
CONN 20
J-7Y-3921
Hammer Control Switch
E-7
CONN 82
A-106-0025
Travel Press Switch
F-2
CONN 75
L-102-7902
Creeper Speed Control Switch
F-7
CONN 61
H-5I-8215
Low Idle Switch
E-5
CONN 74
L-102-7902
Seat Heater Switch
F-7
CONN 60
K-7Y-3868
Horn Switch
F-5
CONN 77
MM-5I-8374
LL-5I-8375
F-9
* = Connector is located at the component.
10 Contacts
5 Contacts
2 Contacts
4 Contacts
3 Contacts
2 Contacts
2 Contacts
Bullet
Terminal
4 Contacts
HARNESS CONNECTOR LOCATION CHART
7 Contacts
1
E
2
E
3
E
4
A
4
3
B
1
C
1
4
D
4
D
3
D
2
5
A
3
6
D
1
7
C
7
C
7
B
2
9
B
3
10
D
5
A
1
11
23
F
2
F
3
F
4
24
25
A
2
31
32
B
4
1
B
7
C
6
B
9
34
C
5
C
3
B
5
36
C
10
C
9
E
6
C
8
33
32
27
28
29
30
26
F
1
31
22
H
2
H
3
37
21
20
H
1
G
1
H
4
G
3
C
4
E
5
19
18
40
39
35
38
17
B
8
16
15
14
13
11
12
10
71015 14 13 12 11
1112131415
200-BK
135-BU
1
2
3
4
RADIO FOR JAPAN
B747-PU
B747-PU
B751-YL
2
264-BK
266-BK
828-WH
200-BK
200-BK
200-BK
828-WH
830-OR
200-BK
828-WH
830-OR
200-BK
1
D760-YL
200-BK
200-BK
D760-YL
2
1
B747-PU
147-PU
124-GN
A537-PK
B747-PU
1
2
B747-PU
200-BK
200-BK 2
1
B747-PU
147-PU
B747-PU
A537-PK
124-GN
BK-00
B747-PU
200-BK
A537-PK
RD-00
147-PU
A537-PK
B747-PU
124-GN
200-BK
B747-PU
200-BK
1
4
3
5
2
D764-GN
D764-GN
D764-GN
501-GN
200-BK
200-BK
D761-GN
D760-YL147-PU
147-PU
D761-GN
147-PU
D761-GN
147-PU
147-PU
D761-GN
200-BK
235-BK
200-BK
D761-GND761-GN
200-BK
325-PK
365-YL
325-PK
365-YL
506-PU
513-OR
109-OR-6
113-OR
311-WH
492-GY
403-GN
309-GY
200-BK
200-BK-6
200-BK
200-BK
200-BK
513-OR
311-WH
113-OR
A771-PU
365-YL
168-GN
168-GN
168-GN
365-YL
365-YL
309-GY
506-PU
121-YL
113-OR
B786-BU
10
200-BK-14
103-YL
615-YL
519-PK
103-YL
200-BK
578-BU
152-BU
575-YL
152-BU
576-PK
586-BR
147-PU
578-BU
200-BK
575-YL
152-BU
576-PK
310-PU
578-BU
519-PK
200-BK
578-BU
2
4
1
3
200-BK
576-PK
575-YL
152-BU
109-OR-6
101-RD-14
101-RD-14
101-RD-6
112-PU-6
112-PU-14
112-PU-14
112-PU-14
112-PU-14
112-PU-14
578-BU
501-GN
118-GY
791-PK
115-PK
115-PK
501-GN
118-GY
118-GY
792-OR
118-GY
500-BR
118-GY
323-WH
113-OR
120-YL
149-PU
101-RD-6
RD-00RD-00
115-PK
112-PU-14
235-BK
200-BK
616-BU
616-BU
200-BK
RD-00
112-PU-14
200-BK
200-BK
109-OR-6
1
D764-GN
RELAY PANEL
RELAY PANEL
RELAY PANEL
103-YL
1
492-GY
309-GY
113-OR
112-PU-6
5
152-BU
BK-00
310-PU
5
1
2
B786-BU
7
2
4
2
3
7
OPERATOR STATION
200-BK
A768-BU
6
5
1
B790-OR
B790-OR
B789-BR
B789-BR
B789-BR
B790-OR
5
B956-PK
B955-YL
615-YL
200-BK
615-YL
501-GN
500-BR
200-BK
103-YL
500-BR
308-YL
308-YL
410-WH
200-BK
403-GN
113-OR
B956-PK
B730-OR
121-YL
830-OR
142-BU-14
D760-YL
129-BU
200-BK
118-GY
501-GN
B751-YL
A763-GY
A761-PU
113-OR
A768-BU
763-BU
200-BK
10
A769-GY
A769-GY
A768-BU
763-BU
142-BU
142-BU
142-BU
142-BU
142-BU
142-BU
B964-YL
142-BU-14
4
B751-YL
A763-GY
A761-PU
113-0R
3
A762-PU
326-PU
405-GY
788-YL
200-BK
200-BK-10
301-BU-10
RD-00
304-WH-8
3
113-OR
RD-00
B731-WH
200-BK
B730-OR
185-YL
B751-YL
A763-GY
B789-BR
B789-BR
B739-WH
B790-OR
A769-GY
A768-BU
B790-OR
B740-OR
185-YL
BK-00
200-BK-6
200-BK
200-BK
616-BU149-PU
786-GN
7
149-PU
506-PU118-GY
F
E
D
C
118-GY
200-BK
200-BK
A762-PU
788-YL
405-GY
326-PU
513-OR
2
3
7
4
6
2
1
4
1
3
2
1
101-RD-6
200-BK
304-WH-8
B
9
109-OR-6
2
1
2
120-YL
2
1
2
1
5
200-BK
200-BK
491-PK
B965-GY
142-BU-14
B964-YL
B964-YL
B751-YL
A769-GY
A768-BU
A763-GY
A761-PU
763-BU
491-PK
113-OR
A762-PU
788-YL
326-PU
405-GY
403-GN
304-WH-8
109-OR-6
101-RD-6
365-YL
323-WH
506-PU
495-GN
321-BR
301-BU-10
200-BK-10
326-PU
200-BK
513-OR
200-BK
519-PK
513-OR
519-PK
405-GY
2
3
1
2
200-BK
311-WH
200-BK-6
309-GY
403-GN
109-OR-6
200-BK
492-GY
113-OR
113-OR
495-GN
121-YL
365-YL
323-WH
513-OR
311-WH
8
A771-PU
311-WH
365-YL
828-WH
321-BR
121-YL
321-BR
121-YL
122-BU
210-BK
200-BK-6
109-OR-8
122-BU
120-YL
122-BU
506-PU 9
321-BR
1
5
6
311-WH
310-PU
506-PU
200-BK
495-GN
RADIO FOR JAPAN
6
122-BU 1
2120-YL
122-BU
200-BK
323-WH
200-BK
323-WH
2
5
3
4
1 124-GN-14
122-BU
1
118-GY
501-GN
200-BK
200-BK
200-BK
200-BK
200-BK
200-BK
615-YL
B956-PK
500-BR
B955-YL
501-GN
118-GY
4
5
4
8
7
500-BR
D760-YL
403-GN
129-BU
113-OR
1
607-PK
615-YL
615-YL
3
200-BK
10
410-WH
9
A769-GY
576-PK
575-YL
578-BU
152-BU
152-BU
586-BR
147-PU
A768-BU
185-YL
B740-OR
B790-OR
B739-WH
B789-BR
B751-YL
A763-GY
200-BK
4
1
2
5
10
8
9
6
7
3
495-GN
A769-GY
A770-PK
B731-WH
185-YL
185-YL
B731-WH
A770-PK
B730-OR
2
BK
2
A768-BU
RD
A770-PK
A
200-BK
A983-BU
A758-BR
A757-GY
A756-BU
A755-PK
308-YL
310-PU
105-BR
307-OR
326-PU
308-YL
308-YL
D760-YLD760-YL
308-YL
326-PU
105-BR
A758-BR
A757-GY
A756-BU
A755-PK
310-PU
307-OR
200-BK
200-BK
200-BK200-BK
200-BK
200-BK
200-BK
200-BK
235-BK
200-BK
200-BK
320-OR
200-BK
8
3
2
4
5
1
200-BK
4
3
2
1
2
B786-BU
10
1
9
8
7
2
3
6
4
1
2
519-PK
124-GN-14
A983-BU
792-OR
791-PK
786-GN
235-BK
184-BU
513-OR
235-BK
120-YL
B956-PK
B955-YL
B790-OR
B789-BR
B786-BU
B739-WH
B740-OR
B731-WH
B730-OR
A758-BR
A757-GY
A756-BU
A755-PK
410-WH
308-YL
B734-GY
B964-YL
B965-GY
A771-PU
A762-PU
A761-PU
788-YL
763-BU
495-GN
492-GY
491-PK
405-GY
403-GN
321-BR
4
3
2
1
122-BU
ATCH RADIO FOR OUTSIDE JAPAN
200-BK
B965-GY
120-YL
B965-GY
264-BK
112-PU-14
101-RD-14
152-BU
118-GY
121-YL
184-BU
103-YL
114-GN
109-OR-8
306-GN
200-BK
304-WH-8
101-RD-6
101-RD-14
101-RD-14
607-PK
616-BU
322-GY
791-PK
786-GN
A983-BU
792-OR
184-BU
322-GY
320-OR
114-GN
114-GN
506-PU
142-BU-14
113-OR
121-YL
200-BK
200-BK
BK-00
308-YL 309-GY
A762-PU
788-YL
112-PU-14
320-OR
200-BK
112-PU-14
101-RD-14
147-PU
124-GN-14
129-BU
185-YL
105-BR
607-PK
607-PK
10
200-BK
200-BK
200-BK
322-GY
616-BU
109-OR-6
101-RD-6
304-WH-8
607-PK
616-BU
322-GY
200-BK
615-YL
D760-YL
501-GN
500-BR
120-YL
118-GY
103-YL
320-OR
185-YL
147-PU
129-BU
124-GN-14
105-BR
306-GN
308-YL
2
109-OR-6
109-OR-6
101-RD-6
304-WH-8
200-BK
200-BK-6
200-BK
235-BK
235-BK
235-BK
A983-BU
792-OR
791-PK
786-GN
B964-YL
B965-GY
A771-PU
A762-PU
A761-PU
788-YL
763-BU
495-GN
492-GY
491-PK
405-GY
321-BR
403-GN
304-WH-8
101-RD-6
109-OR-6
506-PU
309-GY
323-WH
142-BU-14
121-YL
A769-GY
A763-GY
B751-YL
326-PU
A768-BU
200-BK
6
5
1
2
5
10
2
1
6
9
8
7
4
3
10
1
6
3
9
8
6
7
5
830-OR
142-BU-14
4
3
7
2
5
1
4
113-OR
184-BU
615-YL
501-GN
500-BR
120-YL
118-GY
152-BU
103-YL
320-OR
185-YL
147-PU
129-BU
124-GN-14
105-BR
306-GN
308-YL
B956-PK
B955-YL
B790-OR
B789-BR
B786-BU
B740-OR
B739-WH
B734-GY
B731-WH
B730-OR
A758-BR
A757-GY
A756-BU
A755-PK
A768-BU
410-WH
501-GN
500-BR
410-WH
120-YL
118-GY
152-BU
113-OR
320-OR
308-YL
306-GN
185-YL
147-PU
129-BU
124-GN-14
105-BR
103-YL
B786-BU
B740-OR
B739-WH
B734-GY
B731-WH
9
B730-OR
403-GN
B747-PU
A769-GY
A768-BU
A763-GY
326-PU
200-BK
586-BR
200-BK
586-BR
A758-BR
A757-GY
A756-BU
A755-PK
B790-OR
B789-BR
9
D760-YL
D760-YL
8
10
7
2
1
6
5
4
3
10
6
5
4
3
9
8
7
2
1
10
9
8
7
2
1
6
5
4
3
8
323-WH
5
323-WH
1
6
7
2
1
615-YL
3
1
2
200-BK-14
200-BK
306-GN
200-BK
307-OR
B734-GY
B734-GY
306-GN
124-GN-14
615-YL
B956-PK
B955-YL
501-GN
500-BR
410-WH
403-GN
129-BU
120-YL
118-GY
113-OR
103-YL
B731-WH
B730-OR
A769-GY
A768-BU
185-YL
147-PU
B789-BR
B751-YL
B740-OR
B739-WH
A763-GY
586-BR
152-BU
B790-OR
320-OR
B786-BU
A758-BR
A757-GY
A756-BU
A755-PK
326-PU
308-YL
105-BR
200-BK
200-BK
200-BK
322-GY
322-GY
200-BK
322-GY
200-BK
616-BU
200-BK
200-BK
616-BU
200-BK
200-BK
129-BU
403-GN
410-WH
113-OR
B955-YL
201-BK
BK-00
1
B955-YL
4
3
B956-PK
200-BK
D760-YL
113-OR
118-GY
200-BK
500-BR
500-BR
501-GN
118-GY
501-GN
200-BK
200-BK
615-YL
615-YL
615-YL
200-BK
4
2
3
9 8 7
200-BK
9 8
615-YL
6 5 4
615-YL
6 5 4
3 2
1
F
E
D
3 2
1
C
B
A
SPEAKER 7Y-5505
200-BK
103-YL
122-BU
615-YL
509-WH
508-PU
T
SPEAKER (-)
511-BR
512-GN
F
T
ATCH
ANTENNA
106-0036
3
1
4
2
ILLUMI (+)
ACC (+)
SPEAKER (+)
GND
BUCK UP
SPEAKER (-)
SPEAKER (+)
AM/FM RADIO
7Y-5437
AM RADIO
7Y-5433
Y
Y 5I-8249 A-15
SPEAKER 7Y-5505(NOTE H)
CONVERTER
7T-8000
U
TO RADIO
ANTENNA
106-0036
U
T
SS
SS
U
U
GROUND
+12 VOLT
GROUND
+ BATTERY
1
2
3
WH/BK-18
WH/RD-18
1
2
SS
SS
BK-18
RD-18
KK
NOTE H: USE WITH AM/FM RADIO
NOTE G: USE WITH WIDE WIDTH CAB
KK 7Y-8298 B-14 (NOTE B)
RR
RR
RR
RR
RR
RR
RR
RR
RR
RR
RR
RR
RR
RR
RR
RR
RR
RRRRRR
RR
RR
TRAVEL SW (LEFT)
RR
RR
RR
RR RR RR RR RR
RR
RR
RR
RR 105-9997 D-3
NOTE
RR
RR
RR
RR
A
A
A
A
RR
RR
RR
1
2
RR
A
TRAVEL
PRESS SW
(LEFT)
4I-5387
2
1
1
2
A
MM 5I-8374 F-9 (NOTE E)
MM LL
LL 5I-8375 F-7 (NOTE E)
LL
ATCH
FINE SWING
CONT SW
7X-6386 (NOTE E)
1
MM
A
2
3 3
2
Y
Y
ATCH
SEAT WITH
SEAT HEATER
100-7729
100-7678 (NOTE G)
A
NOTE C: USE WITH CAB RISER
UU 7Y-8123 F-4 (NOTE C)
Z 111-4724 D-5 (NOTE C)
1
2
ATCH
SEAT HEATER SW
7X-6386
ATCH
CREEPER SPEED
CONT SW
7X-6386
1
2
L
ATCH
CREEPER SPEED
CONT SOL
7I-8190
7N-0719(NOTE B)
ATCH
CREEPER SPEED
CONT SOL
7I-8190
A
ATCH
A/C UNIT
4I-0470
1
2
X 7Y-8108 C-6 (NOTE E)
ATCH FINE
SWING RELAY
7Y-5490
(NOTE E)
2
1
1
2
1
H
H
H
J
W
W
W
W C
19
ATCH
REFUELING
PUMP
6C-5572
ATCH
REFUELING
PUMP SW
7Y-8263
J
J
J
MOTOR
1
2
2
1
1
2
ATCH
REFUELING SW
5C-6108
MOTOR
W 7Y-3855 E-14
V
V
V 7Y-8143 C-2 (NOTE A)
NOTE A: USE WITH SHORT BOOM
L24
L23
L24
L18
L23
L24
ATCH REFUELING
PUMP RELAY
7Y-5490
20A
15A10A
WW
WW
L4
L25
L19
L22
L4
L6
L20
L4
L7
L8
L3
L8
L3
L4
L8
L31
DOME LAMP
096-0721
J
J
A
A
ATCH LOWER
WIPER MOTOR
4I-5019
A
+
S
+1
-
MOTOR
ATCH
WASHER
MOTOR
7T-8890
MOTOR
C
ALT BREAKER
9S-0174
L31
CHASSIS/CAB LIGHT
RELAY
7Y-5490
WIPER RELAY
7Y-5490
L27
SOLENOID
MONITOR
RADIO
BOOM LAMP
CHASSIS/CAB LAMP
VV
MAIN RELAY
3T-0376
R
UNLESS OTHERWISE SPECIFIED: ALL WIRE IS 16 GAGE
COMPONENT ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF
THIS SCHEMATIC IS FOR THE 325 EXCAVATOR
JJ 7Y-5507 A-3 (NOTE B)
HH 7Y-3946 A-2 (NOTE B)
GG 111-4737 A-2 (NOTE B)
A
EE 7Y-3883 B-13
DD 105-9947 A-3
CC 105-9940 A-3
BB 7Y-3946 A-2
AA 111-4725 A-2
CABLE AS.
VV 111-4711 B-7
WIRE AS.
T 7Y-8139 E-11
S 7Y-5508 D-5
R 7Y-8216 C-2
D
D
GG
CAB
CHASSIS
D
AA
MM
EE
H
CHASSIS
C
PLATFORM
PLATFORM
S S
M
MM
XX
M
A A
E
E
G
N N
NN
P
P
R
CCCC BB AA
DD
JJ
JJ HH
GG
P 7Y-3887 D-2
N 7Y-8245 E-1
M 105-9944 B-4
L 102-7902 F-9
K 7Y-3868 F-6
J 7Y-3921 E-9
H 5I-8215 E-6
G 5I-8217 E-1
F 5I-8216 E-10
E 111-4712 E-10
D 7Y-8113  C-15
C 105-9948  D-13
A 106-0025  D-4 (NOTE J)
GY
PU
BR
RED
WHITE
ORANGE
YELLOW
PINK
ABBREV COLOR
BLACK
GRAY
PURPLE
BROWN
DESCRIPTIONSYMBOL
CONNECTOR
ELECTRICAL CONNECTION
TO VEHICLE STRUCTURE
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
IDENT PART NO. LOC
HARNESS AS.
C
C
D
D
D
HEATER
UNIT
4I-1275
C
C
C
E
F
A
AC
K
HA
H
A
A
A A A A A
M
M
M
M
NOTE E: USE WITH MODEL X224,X225
CHASSIS
A
F
G
CAB
E
E
F
F
NOTE B: USE WITH COLD WEATHER
BK-00 BK-OO
ATCH
BOOM LAMP
5I-8250
POS
NEGNEG
POS
BATTERY
3T-5760
L6
L7
L8
L9
L20
L5
L1
L7
L5
L3
L6
L7
L5
L2
L6
L6
L16
L15
L12
L14
L5
L7
L6
L7
L6
L8
L9
L5
L12
L11
L2
L1
L13
L12
L11
L13
L14
L16
L15
L12
L14
L17
L15
L17
L16
L30
L10
L2
L1
MOTOR
L27
L3
-
+1
S
+
OPERATOR STATION
OPERATOR STATIONOPERATOR STATION
OPERATOR STATION OPERATOR STATION
OPERATOR STATION
OPERATOR STATION
SIG 4
SIG 3
SIG 2
SIG 1
COM
UU
Z
F
2
1
3
2
1
J
J
ATCH HAMMER
CONT SW
7X-6386
ATCH
AUX HYD
PRESS SW
4I-5387
ATCH
START AID SOL
9G-4365
11
24
2
HYD OIL LEVEL SW
BOOM RAISE PRESS SW
OPTION SOLENOID
13
5
4
16
9
15
SWING POWER CHANGE SOLENOID
COOLANT LEVEL SW
ENGINE OIL LEVEL SW
OPTION SENSOR
OPTION SW 1
OPTION SW 2
10
11
4
3
26
16
15
23
31
21
18
17
OPTION RELAY 3
OPTION RELAY 2
OPTION RELAY 1
GLOW
RS232C RxD
RS232C TxD
PWM OUT -
PWM OUT +
ATCH LOWER
WASHER SW
7X-6387
CHASSIS
LAMP
5I-8251
ATCH
CAB LAMP
5I-8250
ATCH LOWER
WIPER SW
7X-6388
28
L4
L3
ATCH
START AID
COOLANT TEMP SW
8C-3569
ENG OIL
PRESS SW
6T-1546
ALTERNATOR
9W-3043
ENGINE
SHUTDOWN SOL
8C-3663
ATCH
TRAVEL ALARM
3T-1444
ATCH
A/C COMPR
CLUTCH SOL
7T-8600 NOTE J
COOLANT TEMP
SENSOR
3E-5370
ATCH
REFRIGERANT
LOW PRESS. SW
5I-3959
ENGINE SPEED
SENSOR
3E-7886
FUEL
LEVEL
SENSOR
7Y-3848 NOTE J
WASHER
MOTOR
7T-8890
IMPLEMENT
PRESS SW
102-8041
HORN SW
6I-5088
STARTER KEY
SWITCH
9G-7641
VV
ENGINE
SPEED DIAL
7Y-5465
ATCH HAMMER
CONT SOL
7Y-5005
DISCONNECT
SWITCH
7N-0718
ATCH START
AID SW
7X-6387
CIGAR
LIGHTER
9W-0335
HORN
7T-0969
HORN
7T-0970
U 7Y-8105 E-12
3E-6328
INSTRUMENT
PANEL
7Y-5500
SERVICE
METER
6T-7337
ATCH
CAB LAMP
5I-8250
1
L30
L28
WASHER RELAY
WIPER MOTOR RELAY
CHASISS LAMP RELAY
BOOM LAMP RELAY
GND
BACKUP SW1
HARNESS CODE 4
HARNESS CODE 3
HARNESS CODE 2
HARNESS CODE 1
RS485 -
RS485 +
BACKUP SW2
LOW IDOL SW
G/A -
G/A +
+B (24V)
GND
SWING BRAKE SW
ENG SPEED SENSOR -
G/A SENSOR
ENG SPEED SENSOR +
TRAVEL SOLENOID
FUEL LEVEL SENSOR
COOLANT SENSOR
HYD OIL TEMP SENSOR
ENGIN OIL SW
ALTERNATOR (R TERM)
TRAVEL ALARM
LEVEL FINISH SOL.
TRENCHING SOL.
PROPORTIONAL
REDUCING VALVE
5I-8368
ATCH
GROUND STRAP
7G-1060(NOTE C)
L23
TRAVEL SW (RIGHT)
X
TRAVEL SPEED
SOL
7I-1245
L25
WIPER MOTOR
4I-6838
AA
6
4
3
1
5
2
SPEED
CHANGE SW
7N-8008
D
HYD OIL TEMP
SENSOR
4I-5394
BOOM RAISE
PRESS SW
2
1
GOV ACTUATOR
7Y-5461 NOTE J
106-0100 NOTE K
STARTER
MOTOR
8C-4774
9X-4507(NOTE B)
2
1
T
E
W
D
B+
ALT
GROUND
SIGNAL
+B
C
B
A
CHASSIS
L1
XX
2
1
XX 111-4710 B-4
TT 106-0026 F-8
PP 106-0027 F-8
A
2
1
L17
MOTOR
2
1
PP
2
1
TTTT
A
L2
2
1
ATCH RADIO
CONT SW
7X-6386
T
L18
L19
L18
ONE TOUCH
LOW IDLE SW
6I-5088
4
6
1
3
5
2
GOV
BACKUP SW
3T-4405
CHASSIS
CAB RIZER
FRAME
(NOTE C)
GROUND STRAP
7G-1060
CHASSIS
ENG/PUMP
CONTROLLER
102-8010 NOTE J
LA
L
A
4
6
1
3
5
2
10
1
2
3
4
9
6
R
C
S
B
OFF
ON
ST
L8
L9
M
2
3
BACKUP
RESISTOR
102-8015
PUMP
BACKUP SW
3T-4405
8
BOOM LIGHT RELAY
7Y-5490
L20
L19
L18
L20
L22
L1
L16
L15
L12
L14
L20
L21
25
35
14
24
5
1
2
BACKUP SW3
L22
L21
L22
L12
L15
SS 5I-8376 D-11 (NOTE H)
L1
EPR SOLENOID +
EPR SOLENOID -
ACCELERATOR 5
ACCELERATOR 4
ACCELERATOR 3
ACCELERATOR 2
MONITOR ALARM
KEY SW
ATTACHMENT
TRENCHING
SOL
7I-1247
LEVEL FINISH
SOL
7I-1246
L2
L16
L14
ATCH
BATTERY
3T-5760
(NOTE B)
33
32
12
22
40
30
19
20
34
36
6
7
8
9
29
39
38
37
20
7
8
17
12
21
19
6
1
22
23
10
18
3
14
WASHER RELAY
7Y-5490
WIPER/WASHER
WIPER/WASHER
TRAVEL ALARM
E/P CONT
DOME LAMP
HORN
SIG
GND
24V+
SIG
L31
L26
L30
L29
GND
200-BK
5V+
L28
L23
HAMMER
A/C /HEATER
CIGAR LIGHTER
BACK UP
RESISTOR
7Y-8242
L26
10A
10A
10A
10A
10A
10A
POS
NEG NEG
POS
PLATFORM
START RELAY
9X-8124
HORN RELAY
7Y-5490
10A
10A
15A
10A
10A
10A
NEUTRAL START
AID SWITCH
9W-2150
L28
BOOM LAMP
5I-8250
KEY SWITCH
10A
20A
10A
15A
10A
10A
L10
L11
L13
L28
L27
L29
D760-YL
BLOCK AS.
7Y-5499
7
5
L9
TRAVEL
PRESS SW
(RIGHT)
4I-5387
X
L29 L29
L27
2
1
L3
ATCH FINE
SWING SOL
7I-0124
(NOTE E)
WW 111-4709 B-8
L26
2
1
2
1
+
-
27
GND
+BATTERY
FINE SWING
REFUELING PUMP
2
1
266-BK
13
1
2
2
1
PLATFORM
YY 116-8178 E-15 (NOTE K)
A 114-5518  D-4 (NOTE K)
CONN 35
CONN 32
CONN 82
CONN 51
CONN 33
CONN 29
CONN 34
CONN 30
CONN 31
CONN 38
CONN 83
ACTION ALARM
CONN 6
CONN 28
CONN 60
CONN 61
CONN 26
CONN 27
CONN 37
CONN 7
CONN 8
CONN 9 CONN 10
CONN 11
CONN 5
CONN 4
CONN
3
ALL DASHED LINES ARE ATTACHMENTS.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS OFF.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS ON.
STARTING CIRCUIT.
GAUGE CIRCUIT.
ENGINE/PUMP CONTROLLER CIRCUIT.
WIPER/WASHER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
ENGINE SHUTDOWN CIRCUIT.
START AID CIRCUIT.
CONN 62
CONN 63
CONN 25A
CONN 25
CONN 24
CONN 23
1
2
L
1
2
CONN 74
CONN 75
CONN 76
CONN 20
2
1
J
CONN 22
CONN 80 CONN 81
CONN 80
CONN 21
CONN 18
CONN 19
CONN 17
CONN 1
CONN 2
106-0134 NOTE K
CONN 56
CONN 55
CONN 54
CONN 53
CONN 12
CONN 78
CONN 79
CONN 67
CONN 13
CONN 14
CONN 70
CONN 15
NOTE J
NOTE J
CONN 15
1
4
3
5
2 2
5
3
4
1
A
ATCH
A/C UNIT
107-1994
HEATER
UNIT
107-1995
A
NOTE K
NOTE K
CONN 12
CONN 68
CONN 69
102-8042 NOTE J
106-0096 NOTE K
CONN 59
CONN 52
CONN 50
CONN 47
CONN 46
CONN 45
CONN 66
CONN 65
CONN 49
CONN 48
105-9993 NOTE K
CONN 64
NOTE J
CONN 40
102-0347 NOTE K
CONN 41
CONN 42
CONN 43
CONN 44
CONN 72
CONN 71
CONN 73
1
519-PK
513-OR
2
YY
NOTE K
ATCH REFRIGERANT SW
114-5334
1
2
C
CONN 39
CONN 39
CONN 77
CONN 58
NOTE J: USE WITH SERIAL NUMBERS 8NL1-UP AND 9KL1-UP
NOTE K: USE WITH SERIAL NUMBERS 6RM 1-UP AND 7LM1-UP
CONN 36
YY
CONN 15
CONN 15