SENR6238
May 1994
320 & 320 L Excavators
Electrical System
320:
8LK1276-UP
2DL214-UP
320 L:
9KK1359-UP
1KL442-UP
Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
Actuator - Governor
C-7 1
Seat - Heater
E-4 36
Alarm - Action
D-2 3A
Sender - Engine Coolant Temperature
B-12 19
Alarm - Travel
E-12 2
Sender - Hydraulic Oil Temperature
A-8 3F
Alternator
C-12 3
Sensor - Fuel Level
A-5 20
Antenna
C-6, D-6 4
Sensor - Speed
B-11 21
Battery
E-10, E-11 5
Solenoid - Air Conditioner Compress Clutch
C-12 22
Block - Terminal
D-9 1D
Solenoid - Creeper Speed Control
A-12 6F
Breaker
D-9 4D
Solenoid - Creeper Speed Control
A-12 7F
Controller
B-7 6
Solenoid - Engine Stop
B-11 23
Converter
D-6 34
Solenoid - Fine Swing
B-4 24
Dial - Engine Speed
C-2 3B
Solenoid - Hammer Control
B-4 25
Fuse - Block
F-7,F-8,F-9 6D
Solenoid - Level
A-9 4F
Heater - Air
C-11 7
Solenoid - Travel Speed
B-9 1F
Horn
A-2, B-2 8
Solenoid - Trenching
B-9 2F
Lamp - Boom
A-2, B-2 9
Speaker
B-6 26
Lamp - Cab
E-1, F-1 10
Switch - Aux Hydraulic Press
E-2 27
Lamp - Chassis
A-2 11
Switch - Boom Raise Press
B-10 3E
Lamp - Dome
C-6 12
Switch - Creeper Speed Control
F-3 5C
Lighter - Cigar
E-3 1A
Switch - Disconnect
D-9 50
Meter - Service
E-2 2A
Switch - Engine Oil Press
B-12 28
Monitor
E-2 4A
Switch - Fine Swing Control
F-3 6C
Motor - Lower Wiper
F-2 13
Switch - Governor Backup
C-5 6B
Motor - Starter
B-12 14
Switch - Hammer Control
C-3 9B
Motor - Washer
E-12 15
Switch - Horn
F-2 3C
Motor - Wiper
F-2 16
Switch - Implement Swing Press
B-10 1E
Pump - Refueling
A-3 17
Switch - Low Idle
D-3 2B
Radio
C-6 18
Switch - Lower Washer
B-3 76
Relay - Boom Lamp
E-8 7D
Switch - Lower Wiper
D-3 8B
Relay - Chassis/Cab Lamp
E-9 7D
Switch - Neutral Start
F-2 29
Relay - Engine Shutdown
D-8 2D
Switch - Pump Backup
F-4 2C
Relay - Fine Swing
E-9 7D
Switch - Radio Control
E-4 7C
Relay - Heater
D-7 8D
Switch - Refrigerant Low Press
F-12 30
Relay - Horn
E-7 7D
Switch - Refueling
A-5 31
Relay - Main
D-7 3D
Switch - Refueling Pump
A-3 32
Relay - Refueling Pump
E-7 7D
Switch - Seat Heater
F-3 4C
Relay - Safety
D-8 9D
Switch - Speed Change
C-4 5B
Relay - Starter
B-12 35
Switch - Starter
C-2 1B
Relay - Washer
E-9 7D
Switch - Travel Press
B-10 2E
Relay - Wiper
E-8 7D
Unit - Air Conditioner
E-6 33
Resistor - Backup
F-5 1C
Unit - Heater
E-6 37
Valve - Proportional Reducing
A-9 5F
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 - 1060030
Controller
C-7
CONN30
A
E - 1114712
Monitor
E-2
24 Contacts
CONN2
*
A - 1060030
Controller
B-7
CONN12
F - 5I8216, V - 5I8376
R7Y8139
C-6
CONN9
D
A - 1060030
B - 1060031
D-10
CONN12
F - 5l8216
U - 7Y8105
D-6
CONN8
D
A - 1060030
B -1060031
E-10
CONN25
A - 1060030
H - 518235
D-3
CONN13
A
A -1060030
F - 518216
C-5
CONN21
B
J -7Y3921
Lower Wiper Switch
C-3
CONN3
D
A - 1060030
G -1059963
E-9
CONN43
R - 7V8139, V - 5I8376
Speaker
B-6
CONN5
D
A - 1060030
G - 1059963
F-9
CONN72
V - 5I8376
Speaker
B-6
CONN6
D
A - 1060030
G - 1059963
E-9
CONN64
U - 7Y8105
Converter
D-6
CONN24
A - 1060030
H - 518235
D-3
CONN29
A - 1060030
Aux Hydraulic Press Switch
E-2
CONN18
B
A - 1060030
J - 7Y3921
D-4
CONN23
A - 1060030
K - 7Y3868
F-3
CONN17
C
A -1060030
L - 1027902
E-5
CONN4O
B - 1060031
Air Conditioner Compress Clutch
Solenoid
C-12
CONN4
D
B - 1060031
G - 1059963
D-9
CON N50
E
B - 1060031
Boom Raise Press Switch
B-10
9 Contacts
CONN57
R - 7Y8139,
V -518376 Radio
C-6
CONN34
B - 1060031
C - 4I5361
A-3
7 Contacts
CONN14
A
A - 1060030
E - 1114712
C-5
CONN49
B - 1060031
Fuel Level Sensor
A-5
CONN10
D
A - 1060030
B - 1060031
D-10
CONN51
E
B - 1060031
Implement Swing Press Switch
B-10
CONN11
D
B - 1060031
Safety Relay
E-8
CONN53
F
B - 1060031
Level Solenoid
A-9
CONN28
D - 518217
F -5l8216
E-2
CONN38
B - 1060031
N - 7Y3943
B-2
CONN15
C
A - 1060030
Air Conditioner Unit
E-6
CONN56
F
B - 1060031
Proportional Reducing Valve
A-9
CONN15
C
A -1060030
Heater Unit
E-6
CONN39
B - 1060031
Refrigerant Low Press Switch
F-12
CONN19
B
A - 1060030
J - 7Y3921
D-5
CONN41
B - 1060031
Refueling Pump
A-3
CONN44
D
G - 1059963
GovernorActuator
C-8
CONN48
B - 1060031
ZZ - 5I8258
A-5
CONN27
B
H - 518235
Engine Speed Dial
C-2
CONN47
B - 1060031
S - 5I8255
B-3
CONN58
D
A - 1060030
A - 1060030
C-8
CONN42
B - 1060031
Speed Sensor
B-11
CONN33
A - 1060030
Lower Wiper Motor
F-2
CONN7
B - 1060031
T - 5I8234
B-3
CONN32
D - 518217
Wiper Motor
F-2
CONN45
B - 1060031
Travel Alarm
E-12
Harness Connector Location
Connector
Machine
Location
Harness And/Or
Components
Schematic
Location
Connector
Machine
Location
Harness And/Or
Components
Schematic
Location
CONN52
E
B - 1060031
Travel Press Switch
B-10
CONN65
Y - 1027879
Creeper Speed Control Solenoid
A-12
CONN55
F
B - 1060031
Travel Speed Solenoid
B-9
CONN66
F
Y - 1027879
Creeper Speed Control Solenoid
A-12
CONN54
F
B - 1060031
Trenching Solenoid
B-9
CONN67
C
X -518375
Fine Swing Control Switch
F-3
CONN31
A
E - 1114712
Action Alarm
D-2
CONN26
B
H - 518235
Low Idle Switch
D-3
CONN36
F - 518216
M - 7Y8245
E-1
CONN59
C
K - 7Y3868
Horn Switch
F-3
CONN35
F - 518216
M - 7Y8245
F-1
CONN20
B
J - 7Y3921
Hammer Control Switch
C-3
CONNECTOR IDENTIFICATION
CONN22
B
J - 7Y3921
Lower Washer Switch
B-3
Connectors
Connector
No.And
Vehicle
Harness J Side
Component
Side
CONN46
S - 518255
Fine Swing Solenoid
B-4 2 Contacts
CONN22
B
F
With blue wire
M
CONN37
T - 518234
Hammer Control Solenoid
B-4 3 Contacts
CONN21
B
F M
CONN25A
A - 1060030
W - 5l8374
D-3 2 Contacts
CONN20
B
F
Without blue wire
M
CONN25B
H - 518235
W - 5l8374
D-3
CONN68
C
A - 1060030
Z - 1060026
E-5
Connectors
Connector
No.And
Vehicle
Harness G Side
Harness A Side
CONN68
C
A - 1060030
MM - 1060027
E-5 10 Contacts
CONN5
D
M
With black wire
F
With black wire
CONN70
C
Z - 1060026
Radio Control Switch
E-4 10 Contacts
CONN6
D
M
Without black wire
F
Without black
wire
CONN71
B - 1060031
Y - 1027879
A-9 10 Contacts
CONN3
D
F M
CONN72
W - 518374
X - 518375
F-5
CONN63
U - 7Y8105
Converter
D-6
Connectors
Connector
No.And
Vehicle
Harness B Side
Harness A Side
CONN60
C
L - 1027902
Creeper Speed Control Switch
F-3 10 Contacts
CONN8
D
F
Without yellow wire
M
Without yellow
wire
CONN61
C
L - 1027902
Seat Heater Switch
F-3 10 Contacts
CONN19
D
M
With yellow wire
F
With yellow
wire
CONN62
C
A - 1060030
Seat Heater
D-4 6 Contacts
CONN10
D
F M
A - Connector at the bottom of cab. E = Connector near main control valve.
B = Connector in operator’s R.H. console. F = Connector near pilot oil manifold.
C= Connector in operator’s L.H. console. * = Connector is located at the component.
D = Connector in relay box.
4 Contacts
3 Contacts
2 Contacts
2 Contacts
2 Contacts
Bullet
Terminal
4 Contacts
10 Contacts
6 Contacts
5 Contacts
A
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
A
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
1
2
3
5
6
78
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
2
3
1
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
33
33
31
32
9
10
8
26
MACHINE HARNESS CONNECTOR AND COMPONENT LOCATIONS
3200369
3
5
6
8
9
1
2
7
3
4
1
2
1
2
3
5
6
7
8
1
2
3
4
AREA A
3300158
AREA B
3200370
1
10
3
4
5
6
7
8
9
3
4
5
6
1
2
7
3
4
5
6
8
9
1
2
7
1
2
3
4
5
6
7
8
9
10
AREA C
3200371
AREA D
3200302
1
2
3
4
5
6
2
3
1
3
4
5
6
2
3
1
2
1
AREA E
3200191
AREA F
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.
5
4
4
3
1
2
1
1
1
7
2
3
6
10
3
7
7
2
9
3
8
5
6
1
7
7
8
7
9
32
28
10
11
12
1
13
14
2
3
15
4
16
17
18
19
20
21
22
3
1
2
2
23
24
6
5
6
10
5
3
8
25
26
29
30
6
8
8
8
9
31
1
2
3
33
27
4
4
5
6
5
6
7
©
1994 Caterpillar
All Rights Reserved
Printed in U.S.A.
101112
12
122-BU
122-BU
120-YL
200-BK
200-BK-14
200-BK
120-YL
120-YL
122-BU 122-BU
122-BU
120-YL
122-BU
RADIO FOR OUTSIDE JAPAN
RADIO FOR JAPAN
BK
RD
200-BK
200-BK
D760-YL
200-BK
200-BK
RD
BK
OR-18
135-BU
BK-18
210-BK
RD-18
BK-18
B747-PU
BK
RD
RD
BK
WH/YL
BK
WH/GN
YL
WH/BU
RELAY PANEL
1
2
3
4
365-YL
323-WH
607-PK
5
BK
PK
OR
B731-WH
185-YL
B730-OR
A770-PK
B751-YL
BK
BK
A770-PK
112-PU-14
235-BK
BK
RD
112-PU-14
BR
GN
112-PU-14
112-PU-14
BU
112-PU-14
BK
200-BK-4
YL
616-BU
616-BU
200-BK
PK
BK
BU
RD
RD
RD
BK
BK
BK
200-BK
200-BK
200-BK
322-GY
322-GY
325-PK
365-YL
A763-GY
B790-OR
114-GN
200-BK-4
BK/PK
115-PK
114-GN
114-GN 320-OR
310-PU
113-OR
OPERATOR STATION
616-BU
120-YL
149-PU
115-PK
586-BR
118-GY
142-BU-14
200-BK
6
200-BK
B740-OR
185-YL
B789-BR
B739-WH
500-BR
ATCH RADIO (NOTE E)
325-PK
B790-OR
120-YL
8
A763-GY
B751-YL
147-PU
103-YL
501-GN
500-BR
320-OR
124-GN-14
129-BU
147-PU
105-BR
310-PU
308-YL
501-GN
147-PU
586-BR
576-PK
152-BU
235-BK
575-YL
586-BR
152-BU
129-BU
200-BK
578-BU
152-BU
B790-OR
A769-GY
B789-BR
B789-BR
B789-BR
B790-OR
9
152-BU
B789-BR
B789-BR
B739-WH
B790-OR
B790-OR
B740-OR
575-YL
576-PK
B730-OR
185-YL
B731-WH
200-BK
320-OR
142-BU-14
F
E
D
152-BU
365-YL
323-WH
C
616-BU
607-PK
322-GY
506-PU
121-YL
506-PU
121-YL
B
200-BK
235-BK
323-WH
365-YL
791-PK
332-BU
786-GN
A983-BU
184-BU
792-OR
615-YL
501-GN
118-GY
500-BR
113-OR
120-YL
200-BK
513-OR
2
109-OR-10
OPERATOR STATION
RELAY PANEL
200-BK
327-PK-10
101-RD-4
101-RD-6
109-OR-6
109-OR-6
RELAY PANEL
578-BU
495-GN
ATCH RADIO (NOTE F)
122-BU
200-BK
200-BK
200-BK
BK-00
200-BK
118-GY
200-BK
200-BK
200-BK
200-BK
200-BK
200-BK
200-BK
615-YL
B956-PK
500-BR
B955-YL
501-GN
118-GY
109-OR
129-BU
113-OR
410-WH
10
5
185-YL
A768-BU
4
3
2
A
1
586-BR
1
877-YL-4
200-BK
200-BK
RD-00
B789-BR
B739-WH
B790-OR
B740-OR
A763-GY
B751-YL
365-YL
124-GN-14
129-BU
147-PU
105-BR
310-PU
308-YL
615-YL
103-YL
500-BR
501-GN
118-GY
113-OR
120-YL
152-BU
103-YL
152-BU
118-GY
121-YL
184-BU
103-YL
114-GN
267-BK
308-YL
325-PK
168-GN
168-GN
168-GN
168-GN
323-WH
365-YL
323-WH
103-YL
122-BU
235-BK
BK-00
332-BU
786-GN
184-BU
264-BK
403-GN
235-BK
235-BK
200-BK
200-BK
200-BK
200-BK
200-BK
607-PK
586-BR
200-BK
200-BK
200-BK
616-BU
322-GY
BK-00
200-BK-6
200-BK200-BK
200-BK
BK-00
BK-00RD-00
7
607-PK
200-BK
200-BK
200-BK
307-OR 306-GN
200-BK
200-BK
200-BK
200-BK
200-BK
322-GY
322-GY
200-BK
322-GY
616-BU
200-BK
200-BK
616-BU
185-YL
11 10 9
8 7
9 8 7
6 5 4
615-YL
6 5 4
3 2
1
F
E
D
3 2
1
C
B
A
B731-WH
185-YL
B730-OR
A768-BU
A769-GY
B747-PU
147-PU
124-GN
A537-PK
124-GN
147-PU
B747-PU
A769-GY
A768-BU
A
B730-OR
185-YL
A
2
1
MM
Z
1
2
A Z
1
2
B731-WH
MM 106-0027 E-5
Z 106-0026 E-5
NOTE J : USE WITH X226HE.
AA 111-4734 F-11 NOTE J
200-BK
V
200-BK
R
B786-BU
SPEAKER (+)
SPEAKER (-)
200-BK
L30
L31
2
1
D760-YL
A
1
3
200-BK
D760-YL
ATCH
FINE SWING
CONT SW
7X-6386
SPEAKER (-)
SPEAKER (+)
GND
BACK UP
A
A
AA
OPTION SOLENOID
COOLANT LEVEL SW
ENG OIL LEVEL SW
OPTION SENSOR
OPTION SW 1
OPTION SW 2
OPTION RELAY 3
OPTION RELAY 2
OPTION RELAY 1
GLOW
RS232C RxD
RS232C TxD
PWM OUT -
PWM OUT +
WASHER RELAY
WIPER MOTOR RELAY
CHASSIS LAMP RELAY
BOOM LAMP RELAY
GND
GND
+B (24V)
BACKUP SW 1
RS485 -
RS485 +
BACKUP SW 4
ACC (+)
ENG PICKUP SENSOR -
TRAVEL SW
ENG PICKUP SENSOR +
TRAVEL SOLENOID
FUEL LEVEL SENSOR
COOLANT SENDER
HYD OIL TEMP SENDER
TRAVEL ALARM
4
3
ILLUMI (+)
17
18
24
23
16
3
12
6
4
5
18
14
9
22
1
7
8
13
2
20
19
17
15
10
11
10
11
21
31
23
28
8
9
6
7
19
20
30
40
36
37
38
39
29
27
13
LOW IDLE SW
24
14
35
25
BACKUP SW 2
15
16
26
2
4
5
EPR VALVE +
EPR VALVE -
1
3
34
33
MONITOR ALARM
KEY SW
AUX HYD PRESS. SW
32
22
12
2
1
GROUND
+12 VOLT
+ BATTERY
GROUND
1
2
3
2
1
ATCH
CONVERTER
7T-8000
ATCH
ANTENNA
106-0036
3
1
4
2
U
U
U
U
TO RADIO
200-BK
ALTERNATOR (P TERM.)
HARNESS CODE 1
HARNESS CODE 2
HARNESS CODE 3
HARNESS CODE 4
ENG OIL PRESS. SW
HYD OIL LEVEL SW
THROTTLE DIAL S4
F
1
2
NOTE F : USE WITH X205HE,X206HE,X207HE,X208HE.
NOTE E : USE WITH X197HE,X198HE.
124-GN
B747-PU
200-BK
A537-PK
L 102-7902 E-5
2
2
W X
L
2
1
ATCH CREEPER
SPEED CONT SW
7X-6386
147-PU
B747-PU
B747-PU
ATCH
A/C CLUTCH SOL
105-9362(NOTE E)
101-1759(NOTE F)
(NOTE J)
B747-PU
B747-PU
200-BK
200-BK
200-BK
X
615-YL
ATCH
ANTENNA
106-0036
4
3
2
1
147-PU
103-YL
200-BK
ATCH
SPEAKER 7Y-5505(NOTE H)
V
A537-PK
124-GN
ATCH SEAT
HEATER SW
7X-6386
1
1
2
A L
L
L
A
ATCH
A/C UNIT
105-9464(NOTE E)
105-9406(NOTE F)
(NOTE J)
103-YL
124-GN-14
200-BK-14
519-PK
2
A
1
3
4
5
GROUND
S
P
L
R
SAFETY RELAY
094-2080
403-GN
D746-PK
B
309-GY
309-GY
615-YL
306-GN
330-YL
THROTTLE DIAL S3
THROTTLE DIAL S2
THROTTLE DIAL S1
IMPLEMENT SW
ENG SHUTDOWN RELAY
TRENCHING SOLENOID
LEVEL FINISH SOLENOID
200-BK
B734-GY
320-OR
A755-PK
A756-BU
A757-GY
A758-BR
105-BR
310-PU
308-YL
309-GY
B786-BU
B790-OR
B740-OR
B789-BR
B739-WH
491-PK
A771-PU
B751-YL
B737-GN
B965-GY
A763-GY
B964-YL
763-BU
152-BU
495-GN
L16
586-BR
492-GY
321-BR
147-PU
405-GY
788-YL
185-YL
A762-PU
D746-PK
309-GY
332-BU
147-PU
B734-GY
403-GN
877-YL
308-YL
410-WH
A758-BR
A757-GY
A756-BU
A755-PK
B786-BU
B956-PK
B955-YL
B789-BR
B790-OR
B739-WH
B740-OR
B730-OR
B731-WH
A768-BU
184-BU
A983-BU
792-OR
791-PK
786-GN
267-BK
266-BK
265-BK
264-BK
235-BK
235-BK
147-PU
115-PK
115-PK
322-GY
149-PU
149-PU
D761-GN
D760-YL
235-BK
607-PK
D760-YL
147-PU
D760-YL
616-BU
147-PU
A983-BU
501-GN
118-GY
B751-YL
A763-GY
786-GN
A761-PU
113-OR
200-BK
147-PU
147-PU
FINE SWING
L19
D760-YL
185-YL-14
185-YL-14
D760-YL
D761-GN
D761-GN
D761-GN
D760-YL
B ZZ
325-PK
2
D761-GN
1
D761-GN
200-BK
1
2
200-BK
D761-GN
2
1
L27
200-BK
D761-GN
200-BK
149-PU
D761-GN
BK-00
B751-YL
A763-GY
A761-PU
200-BK
113-OR
ENGINE
SPEED
7Y-5465
200-BK
200-BK
615-YL
H
185-YL
A768-BU
A769-GY
B730-OR
B731-WH
B956-PK
B955-YL
410-WH
K
H
B955-YL
B956-PK
113-OR
A
201-BK GROUND
403-GN
129-BU
113-OR
118-GY
501-GN
500-BR
615-YL
615-YL
519-PK
124-GN-14
RISER
+
S
+1
-
MOTOR
S
200-BK
B
A
K
PLATFORM
1
2
3
4
ONE TOUCH
LOW IDLE SW
6I-5088
H
615-YL
200-BK
500-BR
S
5
4
3
1
B
BB
B B
BB
AA
BB
B
B A
B
B
B
B
B
GB
GA
G
G
3
1
H
2
X 5I-8375 E-5
W 5I-8374 D-3
W
W
L29
D760-YL
2
D760-YL
ATCH
AUX HYD SW
4I-5387
ATCH
LOWER WIPER
4I-5019
309-GY
118-GY
PLATFORM
200-BK
118-GY
B734-GY
501-GN
B734-GY
200-BK
578-BU
L29
BACKUP
RESISTOR
102-8015
519-PK
A537-PK
586-BR
200-BK
B
200-BK
500-BR
A770-PK
MOTOR
321-BR
121-YL
501-GN
615-YL
200-BK
575-YL
200-BK
COM
575-YL
200-BK
S1
578-BU
S2
506-PU
S3
519-PK
152-BU
122-BU
B786-BU
200-BK
200-BK
B786-BU
308-YL
4
6
1
3
5
2
310-PU
877-YL-4
615-YL
152-BU
501-GN
105-BR
V 5I-8376 C-6 NOTE H
6
7
8
9
5
4
3
2
1
10
2
7
8
9
5
4
10
6
1
3
2
1
10
2
1
3
4
5
9
8
7
6
513-OR
B
AB
A
JJ
CC
B
3
2
1
788-YL
DD
L
YY 4I-5451 D-9
XX 4I-5447 D-9
JJ
578-BU
306-GN
306-GN
B
B
101-RD-4
332-BU
MOTBAT
GS
6
EE
519-PK
586-BR
RD-00
20A
15A
B
JJ
1
2
B
GOV ACTR -
3
ENG PICKUP
5I-7579
A769-GY
EE
5
4
3
2
1
10A
L23
A768-BU
10
A768-BU
1
A769-GY
2
L22
403-GN
A768-BU
309-GY
A762-PU
L18
L13
B734-GY
L15
410-WH
L23
L23
309-GY
A758-BR
327-PK-10
L22
3
L24
L21
L19
L11L11L11
4
S4
L17
RD-00
L19
L20
B
A
UNLESS OTHERWISE SPECIFIED ALL WIRE IS 16 GAGE.
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF.
THIS SCHEMATIC IS FOR THE 320 EXCAVATOR.
JJ 111-4727 E-10
HH 7Y-3946 E-11
GG 4I-5373 E-11
FF 7G-1060 F-6
EE 7Y-3948 B-11
DD 7Y-3947 D-9
CC 111-4732 F-10
BB 7Y-3946 F-11
AA 111-4731 F-11
CABLE AS.
A
VV 7Y-3937 D-7
WIRE AS.
L9
L10
R 7Y-8139 C-6 NOTE G
L8
L5
L2
FF
CAB
CHASSIS
A
4
C
PLATFORM
RISER (NOTE B)
5
9
B
L
B
T
B
ATCH
REFUELING PUMP
6C-5572
A A
E
E
M M
ATCH
REFUELING
PUMP SW
6T-9442
1
2
VV
B
B
AAGG
STARTER KEY SW
7Y-3918
P 7Y-3994 A-2
M 7Y-8245 F-1
K 7Y-3868 F-3
J 7Y-3921 C-3
H 5I-8235 D-3
G 105-9963 F-9
F 5I-8216 E-2
E 111-4712 D-2
D 5I-8217 E-2
C 4I-5361 A-3
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.
B
877-YL
B
B
184-BU
A983-BU
792-OR
B
B
F
E
F
A
109-OR-6
101-RD-4
513-OR
791-PK
A757-GY
D746-PK
CHASSIS
403-GN
309-GY
A
F
D
CAB E
F
F
B
109-OR-6
D746-PK
ATCH
BOOM LAMP
5I-8250
403-GN
8
A756-BU
A755-PK
D746-PK
330-YL
B786-BU
200-BK
142-BU-14
B956-PK
607-PK
506-PU
B955-YL
105-BR
492-GY
307-OR
L2
L4
121-YL
500-BR
310-PU
KK
309-GY
L1
LL
NOTE A : NORMALLY OPEN BEFORE REFRIGERANT CHARGE.
YY
KK
XX
WW
WW
H
A
576-PK
308-YL
118-GY
CHASSIS
403-GN
786-GN
309-GY
OFF
PREHEATBR
405-GY
OPERATOR STATION
OPERATOR STATION
513-OR
325-PK
MOTOR
-
506-PU
+1
D746-PK
NOTE D : USE WITH COLD WEATHER.
306-GN
403-GN
330-YL
309-GY
J
129-BU
142-BU-14
L26
113-OR
5
6
L10
7
2
519-PK
L8
L2
L8
H
L1
LL 7Y-3936 D-9
KK 7Y-3935 D-7
B751-YL
A763-GY
330-YL
B 106-0031 A-9
306-GN
200-BK-6
322-GY
D746-PK
A761-PU
200-BK
B789-BR
B737-GN
616-BU
A771-PU
109-OR-6
A769-GY
B790-OR
A768-BU
6
4
3
1
5
2
101-RD-4
6
4
3
306-GN
S
321-BR
763-BU
L11
B965-GY
121-YL
327-PK-10
B964-YL
B739-WH
142-BU-14
877-YL-4
491-PK
L5
586-BR D746-PK
616-BU
B740-OR
322-GY
321-BR
607-PK
323-WH
405-GY
PLATFORM
B730-OR
60A
BLOCK AS.
7Y-5499
FF
(NOTE B)
ENG GOV
ACTR
106-0092
877-YL
L6
F
B
365-YL
491-PK
235-BK
323-WH
C
495-GN
492-GY
A762-PU
D761-GN
1
BK-00
R
ATCH
CAB LAMP
5I-8250
V
V
R
309-GY
B731-WH
365-YL
WW 4I-5448 D-9
RD-00
308-YL
D
578-BU
E
2
1
5
2
500-BR
576-PK
200-BK
B955-YL
307-OR
323-WH
N 7Y-3943 B-2
ATCH
TRAVEL ALARM
3T-1444
792-OR
FUEL
SENSOR
105-9993
TRAVEL SW
102-8041
791-PK
HORN SW
6I-5088
ATCH FINE SWING
RELAY
7Y-5490
DISCONNECT SW
7N-0718
7N-0719 (NOTE D)
877-YL
HORN
7Y-3919(NOTE E)
(NOTE J)
7T-0969(NOTE F)
615-YL
SERVICE
METER
6T-7337
ATCH
CAB LAMP
5I-8250
J
J
J
332-BU
K
MM
N
P
P
N
118-GY
615-YL
ENG SHUTDOWN
RELAY
9X-8124
327-PK-10
200-BK-14
307-OR
B956-PK
152-BU
1
A758-BR
2
403-GN
H
575-YL
AA
+
-
L11
492-GY
E
607-PK
NOTE C : USE WITH SHORT BOOM.
113-OR
112-PU-14
112-PU-14
ENG
112-PU-14
112-PU-14
A 106-0032 D-4 NOTE B
IMPLEMENT SW
102-8041
578-BU
WW
152-BU
A758-BR
495-GN
308-YL
763-BU
103-YL
788-YL
310-PU
200-BK-10
A762-PU
615-YL
A771-PU
B737-GN
P 4I-5396 A-2 NOTE C
B964-YL
B965-GY
L16
L15
L14
XX
A761-PU
G
235-BK
508-PU
3
4
7
6
509-WH
L1
G
G
GG
788-YL
G
405-GY
492-GY
101-RD-4
L4
495-GN
MOTOR
L3
2
1
403-GN
109-OR-6
309-GY
200-BK
513-OR
513-OR
L27
ATCH
BATTERY
3T-5760
405-GY
L
GOV ACTR +
2
1
G
START RELAY
E
B
P
R
ALT
G
492-GY
200-BK
2
1
101-RD-14
2
1
AIR HEATER
5I-7746
ALTERNATOR
096-9299
(NOTE E)
5I-7982
(NOTE E ATCH)
(NOTE F)
(NOTE J)
G
101-RD-14
YY
101-RD-6
L28
RD-00
109-OR-6
121-YL
506-PU
321-BR
BK-00
519-PK
2
1
519-PK
6
578-BU
NOTE B : USE WITH CAB RISER.
306-GN
L12
T
COOLANT TEMP
SENDER
5I-7578
7
8
9
5
2
1
10
MOTOR
200-BK
512-GN
511-BR
L18
L13
L15
L13
L18
L7
L6
L5
L3
L7
L6
L9
L5
PLATFORM
L26
L25
ATCH
SPEAKER 7Y-5505
L14
L25
101-RD-4
ATCH
REFUELING SW
5C-6108
124-GN-14
103-YL
ATCH
SEAT WITH
SEAT HEATER
105-9528
D764-GN
L13
BOOM RAISE SW
102-8042
B
200-BK
308-YL
200-BK
L12
NOTE G : USE WITH AM RADIO.
NOTE H : USE WITH AM/FM RADIO.
A757-GY
575-YL
A756-BU
1
2
3
4
5
513-OR
109-OR-6
578-BU
112-PU-14
G
ATCH
RADIO SW
7X-6386
506-PU
R1
200-BK
B
C
R2
ACC
START
ON
ATCH
REFRIGERANT SW
105-9344 (NOTE A)(NOTE E)
105-9408 (NOTE A)(NOTE F)(NOTE J)
1
3
L7
L13
1
2
Y 102-7879 A-9
A757-GY
A756-BU
576-PK
WASHER
7T-8890
ATCH
LOWER WASHER
7T-8890
310-PU
A761-PU
109-OR
877-YL
152-BU
877-YL-4
576-PK
586-BR
1
2
ENG/PUMP
CONTROLLER
106-0132
200-BK
200-BK
B747-PU
200-BK
B747-PU
Y B747-PU
200-BK
142-BU
142-BU
142-BU
1
2
2
1
2
1
ATCH CREEPER
SPEED CONT SOL
7I-8190
Y
Y
2
2
1
ATCH CREEPER
SPEED CONT SOL
7I-8190
D761-GN
142-BU
763-BU
142-BU
L24
200-BK
B
B
B
B
495-GN
365-YL
323-WH
607-PK
322-GY
616-BU
586-BR
HEATER UNIT
4I-4650(NOTE E)
(NOTE J)
4I-1275(NOTE F)
ACCEL
BACKUP SW
7N-8008
SPEED
CHANGE SW
3T-4405
ATCH HAMMER
CONT SW
7X-6386
PUMP
BACKUP SW
3T-4405
ATCH
HAMMER
CONT SOL
7Y-5005
CIGAR
LIGHTER
9W-0335
NEUTRAL
START SW
9W-2150
WIPER
4I-6838
ACTION ALARM
3E-6328
MONITOR
7Y-5500
STARTER
5I-7716
ATCH
BOOM LAMP
5I-8250
200-BK
200-BK
491-PK
ATCH LOWER
WASHER SW
7X-6387
HYD OIL
SENDER
4I-5394
763-BU
B965-GY
B964-YL
A768-BU
A769-GY
B965-GY
PROPORTIONAL
REDUCING VALVE
5I-8368
TRAVEL SPEED
SOL
4I-5674
L1
L2
DOME LAMP
096-0721
ATCH
AM/FM RADIO
7Y-5437
142-BU-14
142-BU
B964-YL
1
A761-PU
VV
L20
WW
D764-GN
2
A768-BU
200-BK
365-YL
T
323-WH
607-PK
A769-GY
C
GOV ACTR SENSOR
21
BOOM RAISE PRESS. SW
200-BK
B
586-BR
T
200-BK
1
2
ATCH
FINE SWING
SOL
4I-1042
T 5I-8234 B-3
S 5I-8255 B-3
ZZ 5I-8258 A-5
ENG OIL SW
5I-8005
LL
A983-BU
L28
L28
D764-GN
L15
B 106-0034 A-9 NOTE J
10
A771-PU
500-BR
L31
REFUELING
LOWER WASHER/WIPER
D764-GN
501-GN
118-GY
120-YL
B751-YL
6
322-GY
330-YL
L24
7
8
9
5
JJ
HH
GG
CC
BB
POS
NEG
200-BK
1
ZZ
D764-GN
327-PK-10
200-BK-10
BK-00
L25
200-BK
B737-GN
200-BK
A771-PU
491-PK
877-YL-4
327-PK-10
A762-PU
4
788-YL
616-BU
200-BK
586-BR
491-PK
200-BK
142-BU-14
B964-YL
B965-GY
763-BU
A768-BU
NEG
A769-GY
POS
200-BK
BATTERY
3T-5760
B737-GN
109-OR-6
103-YL
L30
3
405-GY
306-GN
330-YL
2
1
1
2
1
2
200-BK
2
RD-00
506-PU
RD-00
B751-YL
B
POS
NEG
L12
L16
L17
L18
L21
L21
1
877-YL-4
101-RD-4
2
NEG
POS
1
10
9
7
8
4
RELAY PANEL
6
5
3
2
HAMMER
A/C HEATER
1
10
CIGAR LIGHTER
BACKUP
ATCH
REFUELING RELAY
7Y-5490
HEATER RELAY
085-5353
616-BU
MAIN RELAY
3T-0376
ALT BREAKER
9S-0174
FUSE
10A 9W-1442
15A 9W-1441
20A 9W-1446
KEY SW
WASHER/WIPER
TRAVEL ALARM
ENG/PUMP CONT
DOME LAMP
HORN
SOLENOID
MONITOR
RADIO
10
1
2
3
4
5
9
8
7
BOOM LAMP
6
7
10
9
5
4
3
2
1
HORN RELAY
7Y-5490
BOOM LAMP RELAY
7Y-5490
WASHER RELAY
7Y-5490
CAB/CHASSIS LAMP
RELAY
7Y-5490
WIPER RELAY
7Y-5490
6
10A
10A
10A
10A
3
4
5
10A
10A
10A
20A
CAB/CHASSIS LAMP
9
2
10A
10A
15A
CHASSIS
LAMP
5I-8251
10A
8
200-BK
152-BU
103-YL
320-OR
147-PU
124-GN-14
129-BU
YL
185-YL-14
BU
105-BR
113-OR
PU
310-PU
7
6
1
615-YL
B
TRENCHING SOL
4I-5674
A763-GY
BK
A763-GY
5
200-BK
1
HORN
7Y-3920(NOTE E)
(NOTE J)
7T-0970(NOTE F)
10A
10A
CHASSIS
4
3
2
1
SIG
GND
OR 24V+
B734-GY
U 7Y-8105 D-6
+
M
2
1
2
1
A755-PK
113-OR
A755-PK
410-WH
+
-
147-PU
403-GN
+BATTERY
DATA -
DATA +
307-OR
A
10A
J
15A
10A
200-BK
200-BK
4
3
SIG
2
1
A
10A
113-OR
L29
A 106-0030 D-4
LEVEL FINISH
SOL
4I-5674
2
1
2
200-BK
306-GN
200-BK
200-BK
575-YL
320-OR
GND
152-BU
200-BK
ATCH
AM RADIO
7Y-5433
2
1
1
2
B
410-WH
8
5V+
ATCH LOWER
WIPER SW
7X-6388
576-PK
ENG
SHUTDOWN SOL
5I-8008
B
CONN
41
CONN 34
CONN 47
CONN 7
CONN 46
CONN 37
CONN 38
CONN 22
CONN 21
CONN 20
CONN 27
CONN 24
CONN
25
CONN
25B
CONN
25A
CONN 31
CONN 30
DIAL
CONN 36
CONN 35
CONN 32
CONN 33
CONN 29
CONN 59
CONN 67
COMM 23
CONN 61
CONN 60
CONN 72
CONN 17
CONN 68
CONN 68
CONN 70
CONN 62
CONN 18
CONN 19
CONN 15
CONN 15
CONN
14
CONN 13
CONN 49
CONN 48
CONN 12
CONN 63
CONN 64
CONN 57
CONN 72
CONN 43
CONN 44
CONN 1
CONN 2
CONN 55
CONN 54
CONN 53
CONN 56
CONN 71
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.
ENG/PUMP CONTROLLER CIRCUIT.
WIPER/WASHER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
ENGINE SHUTDOWN CIRCUIT.
START AID CIRCUIT.
CONN 11
CONN 5
CONN 6
CONN 3
CONN 4
CONN 8
CONN 51
CONN 50
CONN 52
CONN 42
CONN 65
CONN 66
CONN 40
CONN 45
CONN 39
CONN 9
CONN 10
CONN
12
CONN 28
