320, 320N, 320L, 320S EXCAVATORS ELECTRICAL SCHEMATIC USED IN SERVICE MANUAL SENR5450

Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
Actuator — Governor
C-7
1 Seat — Heater E-4 36
Alarm — Action
E-2
3A Sender — Engine Coolant Temp C-12 19
Alarm — Travel
D-12
2 Sender — Hydraulic Oil Temp A-8 3F
Alternator
B-12
3 Sensor — Fuel Level A-5 20
Antenna
C-6
4 Sensor — Engine Speed B-12 21
Batteries
E-11
5 Solenoid — A/C Compress Clutch C-12 22
Block — Terminal
D-9
1D Solenoid — Engine Shutdown B-12 23
Breaker — Alternator
D-9
4D Solenoid — Fine Swing B-4 24
Controller
B-7
6 Solenoid — Hammer Control B-4 25
Converter
B-6
34 Solenoid — Level B-9 4F
Dial — Engine Speed
C-2
3B Solenoid — Travel Speed B-9 1F
Fuse — Block
F-7,8,9
6D Solenoid — Trenching B-9 2F
Horns
A-2
8 Switch — Boom Raise Pressure B-10 3E
Lamp — Boom
A-2
9 Switch — Disconnect D-9 5D
Lamp — Cab
E-1
10 Switch — Engine Oil Pressure B-12 28
Lamp — Chassis
A-2
11 Switch — Fine Swing Control F-3 6C
Lamp — Dome
C-6
12 Switch — Governor Backup B-5 6B
Lighter — Cigar
E-3
1A Switch — Hammer Control C-3 9B
Meter — Service
E-2
2A Switch — Horn F-2 3C
Monitor
E-2
4A Switch — Implement Swing Pressure B-10 1E
Motor — Lower Wiper
F-2
13 Switch — Low Idle D-3 2B
Motor — Starter
B-12
14 Switch — Neutral Start F-2 29
Motor — Washer
E-12
15 Switch — Pump Backup F-4 2C
Motor — Wiper
F-2
16 Switch — Radio Control E-4 7C
Pump — Refueling
A-3
17 Switch — Refrigerate Low Pressure E-12 30
Radio
C-6
18 Switch — Refueling A-5 31
Relay — Boom Lamp
E-8
7D Switch — Refueling Pump (start) A-3 32
Relay — Chassis/Cab Lamp
E-9
7D Switch — Refueling Pump (stop) A-3 32
Relay — Horn
E-7
7D Switch — Seat Heater F-3 4C
Relay — Main
D-7
3D Switch — Speed Change C-4 5B
Relay — Refueling Pump
E-7
7D Switch — Key Start B-2 1B
Relay — Starter
D-7
35 Switch — Travel Pressure B-10 2E
Relay — Washer
E-8
7D Unit — Air Conditioner E-6 33
Relay — Wiper
E-9
7D Unit — Heater E-6 37
Resistor — Backup
F-5
1C Valve — Proportional Reducing A-9 5F
Machine locations are repeated for components located close together.
Harness Connector Location
Connector
Machine
Location
Harness And/Or
Components
Schematic
Location
Connector
Machine
Location
Harness And/Or
Components
Schematic
Location
40 Contacts
CONN1
*
A - 111-4806
Controller
B-7
CONN23
A - 111-4806
K - 7Y-3868
F-3
24 Contacts
CONN2
*
A - 111-4806
Controller
A-7
CONN40
C - 5I-8268
A/C Clutch Solenoid
C-12
CONN9
D
A - 111-4806
B - 116-5513
D-10
CONN50
E
B - 116-5513
Boom Raise Press Sw
B-10
CONN8
D
A - 111-4806
B - 116-5513
E-10
CONN34
B - 116-5513
Q - 113-2486
A-4
CONN13
A
A - 111-4806
F - 117-5646
C-5
CONN49
B - 116-5513
Fuel Level Sensor
A-5
CONN3
D
A - 111-4806
G - 114-5267
E-9
CONN51
E
B - 116-5513
Implement Swing Press Sw
B-10
CONN5
D
A - 111-4806
G - 114-5267
F-9
CONN53
F
B - 116-5513
Level Solenoid
B-9
CONN6
D
A - 111-4806
G - 114-5267
F-9
CONN38
B - 116-5513
N - 7Y-3943
A-3
CONN24
A - 111-4806
H - 51-8215
D-4
CONN56
F
B - 116-5513
Proportional Reducing Valve
A-9
CONN18
B
A - 111-4806
J - 7Y-3921
D-5
CONN39
B - 116-5513
D - 116-8177
F-12
CONN17
C
A - 111-4806
L - 102-7902
F-5
CONN41
B - 116-5513
Refueling Pump
A-3
CONN4
D
B - 116-5513
G - 114-5267
D-9
CONN48
B - 116-5513
ZZ - 5I-8258
A-5
7 Contacts
CONN14
A
A - 111-4806
E - 6C-91 17
C-5
CONN47
B - 116-5513
S - 113-2485
A-4
6 Contacts
CONN10
D
A - 111-4806
B - 116-5513
D-10
CONN42
B - 116-5513
Engine Speed Sensor
B-12
CONN15
C
A - 111-4806
A/C Unit
E-6
CONN7
B - 116-5513
T - 5I-8255
A-3
CONN15
C
A - 113-1159
Heater Unit
E-6
CONN45
B - 116-5513
Travel Alarm
E-12
CONN19
B
A - 111-4806
J - 7Y-3921
D-5
CONN52
E
B - 116-5513
Travel Pressure Sw
B-10
CONN44
D
G - 114-5267
Governor Actuator
C-8
CONN55
F
B - 116-5513
Travel Speed Solenoid
B-9
CONN27
B
H - 5I-8215
Engine Speed Dial
C-2
CONN54
F
B - 116-5513
Trenching Solenoid
B-9
CONN58
D
A - 111-4806
A - 111-4806
C-8
CONN31
A
E - 6C-9117
Action Alarm
D-2
CONN33
M - 6C-9362
Lower Wiper Motor
F-2
CONN20
B
J - 7Y-3921
Attachment
B-3
CONN32
F - 117-5646
Wiper Motor
F-2
CONN22
B
J - 7Y-3921
Attachment
B-3
CONN30
A
E - 6C-9117
Monitor
E-2
CONN46
T - 5I-8255
Fine Swing Solenoid
B-4
CONN12
F - 117-5646
R - 7Y-8105
B-6
CONN37
U - 5I-8234
Hammer Control Solenoid
B-4
CONN25
A - 111-4806
H - 5I-8215
D-4
CONN68
C
A - 111-4806
Y - 106-0026
E-5
CONN25A
A - 111-4806
W - 5I-8374
E-3
CONN70
C
Y - 106-0026
Radio Control Sw
E-4
CONN25B
H - 5I-8215
W - 5I-8374
D-3
CONN71
B - 116-5513
V - 106-0026
A-9
CONN21
B
J - 7Y-3921
Attachment
B-3
CONN72
W - 5I-8374
X - 5I-8375
F-5
CONN64
R - 7Y-8105
Converter
B-6
CONN63
R - 7Y-8105
Converter
D-6
CONN60
C
L - 102-7902
Attachment
F-3
CONN61
C
L - 102-7902
Seat Heater Switch
F-3
CONN62
C
A - 111-4806
Seat Heater
E-4
CONN67
C
X-5I-8375
Fine Swing Control Sw
F-3
CONN26
B
H - 5I-8215
Low Idle Switch
D-3
CONN59
C
K - 7Y-3868
Horn Switch
F-3
*= Connector is located at the component.
2 Contacts
1 Contact
10 Contacts
5 Contacts
3 Contacts
4 Contacts
A
1
2
3
33
5
6
7
8
9
10
11
12
13
14
15
16
3
4
5
6
8
9
10
11
12
14
15
13
16
B
C
D
E
1
2
17
18
19
20
22
23
24
25
26
27
28
29
30
31
32
37
35
33
34
36
38
7
F
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
26
10
9
8
A
1
2
3
5
6
7
8
9
10
11
12
13
14
15
16
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
24
25
26
27
28
29
30
31
32
37
35
33
34
36
38
7
F
17
18
19
20
21
22
23
24
25
26
27
28
33
31
32
1
MACHINE HARNESS CONNECTOR AND COMPONENT LOCATIONS
3200369
1
2
3
4
5
6
7
8
3
2
1
3
4
5
6
8
9
1
3
2
1
2
7
AREA A
AREA B
330158
3200370
1
3
4
5
6
7
8
9
1
0
3
4
5
6
1
2
7
1
2
3
4
5
6
7
8
9
1
0
3
4
5
6
8
9
1
2
7
AREA C
AREA D
3200371
3200302
1
2
3
4
5
6
3
4
5
6
1
2
7
3
1
2
1
2
3
AREA E AREA F3200191 3200303
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.
SENR6242
August 1994
320, 320 N, 320 L And 320 S
Excavators Electrical System
9WG1161-UP
4ZJ597-UP
3XK1909-UP
6KM213-UP
©
1994 Caterpillar
All Rights Reserved
Printed in U.S.A.
5
4
4
3
1
2
1
1
1
7
3
6
7
7
2
9
3
8
5
6
1
7
8
29
30
7
28
11
12
1
13
14
2
3
15
4
16
17
18
19
20
21
22
3
1
2
2
6
8
25
26
8
9
31
33
27
4
5
6
10
5
3