UENR8062 October 2017
CONN 25
CONN 24
4
58
5
3
14
43
CONN 7 1 CONN 8 22
CONN 29
CONN 10 2
25
CONN 9
CONN 28
320 and 320 GC Excavator Electrical System
53
KTN1-UP HEX1-UP
32 51
CONN 12 SERVICE TOOL
29
23
31
24
50
27
CONN 27 11 CONN 11 21 CONN 5
44 55
CONN 6 CONN 99 CONN 100 CONN 101
CONN 26
CONN 17
16
CONN 31
56
CONN 30
CONN 19
13
54
Volume 1 of 4: Cab
CONN 18 9
CONN 102 CONN 103 CONN 15 CONN 14
CONN 20
19 10
15
CONN 3
CONN 21
13
48
52
46
Symbols
49 T
RIGHT REAR
LEFT HAND CONSOLE
CONN 22 CONN 2 CONN 1
Schematic Location
Machine Location
12V 10A CONVERTER
D-15
1
12V POWER SOCKET
D-15
2
12V POWER SOCKET
D-1
3
AIR SUSPENSION
E-4
4
ATCH BLADE LEVER
E-4
5
ATCH ELEC PEDAL LH
I-6
6
ATCH ELEC PEDAL RH
I-6
7
ATCH FRONT VIEW CAMERA
J-3
8
CAN (1939) DATA LINK
I-1
9
D-16
10
DISPLAY
J-1
11
FUSE BASE
D-5
12
HVAC
C-14
13
JOG DIAL
D-1
14
KEEP ALIVE FUSE(30A)
B-6
15
MACHINE CAN DATA LINK
I-1
16
MOTOR - LOWER WIPER
I-6
17
MOTOR - PARALLEL WIPER
I-6
18
MOTOR - WIPER
D-7
19
MSS KEY READER
F-1
20
RADIAL WIPER CONTROL
C-14
21
RELAY - ATCH ETHER
B-2
22
RELAY - ATCH KEEP ALIVE
B-2
23
CONTROL - BCM
12
33
CONN 23 35
36 (ROTATED FOR CLARITY)
37 38
8 39
40 41 42 34
17 18 7
6 47 57
CONN 16
45 CONN 14 CONN 15
UNDER CAB
Pressure Symbol
RIGHT HAND CONSOLE Component
FUSE PANEL
Harness And Wire Electrical Schematic Symbols
RELAY - ATCH KEEP ALIVE 2
B-2
24
RELAY - ATCH LIFTING PUMP (C9)
C-2
25
RELAY - ATCH PRIMING PUMP (C13)
B-3
26
RELAY - ATCH SEAT BELT
C-2
27
RELAY - DEF PUMP REVERSING VALVE
B-3
28
RELAY - ENGINE KEY
B-2
29
RELAY - ENGINE MAIN POWER
B-3
30
RELAY - MAIN DIODE
B-10
31
RELAY - MAIN POWER
A-2
32
RELAY - R1 HORN
D-4
33
RELAY - R10 AUTO LUBE
D-5
34
RELAY - R2 AFTM
D-4
35
RELAY - R3 REFUEL
D-4
36
RELAY - R4 LIFTING PUMP
D-4
37
RELAY - R5 BOOM LAMP
D-4
38
RELAY - R6 CHASSIS LAMP
D-5
39
RELAY - R7 LOWER WASHER
D-5
40
RELAY - R8 LOWER WIPER
D-5
41
RELAY - R9 CAUTION
D-5
42
ROTARY DIAL
D-1
43
SEAT HEATER
E-4
44
SWITCH - 2ND SHUTDOWN
J-6
45
SWITCH - ATCH BEACON
H-1
46
SWITCH - ATCH FOOT
H-6
47
SWITCH - ATCH OLWD
H-1
48
SWITCH - DOOR LIMIT
I-12
49
SWITCHED 12V READY
D-15
50
SWITCH - NEUTRAL START LIMIT
F-1
51
SWITCH - QCPLR
H-1
52
SWITCH - SEAT
E-4
53
SWITCH - START
D-1
54
SWITCH - UPPER WINDOW LIMIT
B-11
55
TRAVEL ALARM CANCEL
D-1
56
TRAVEL PEDAL
J-6
57
USB/AUX/MIC
E-1
58
Temperature Symbol
Level Symbol
Flow Symbol
Circuit Breaker Symbol
Symbols and Definitions Fuse: A component in an electrical circuit that will open the circuit if too much current flows through it.
Connector Location Connector Number CONN 1 CONN 2 CONN 3 CONN 4 CONN 5 CONN 6 CONN 7 CONN 8 CONN 9 CONN 10 CONN 11 CONN 12 SERVICE TOOL CONN 13 CONN 14 CONN 15 CONN 16 CONN 17 CONN 18 CONN 19 CONN 20 CONN 21 CONN 22 CONN 23 CONN 24 CONN 25 CONN 26 CONN 27
Schematic Location J-16 J-16 J-16 J-16 I-16 G-16 F-16 E-16 E-16 E-16 D-16 B-13 H-9 J-8 I-8 I-8 E-7 F-7 F-7 F-7 G-7 J-4 J-4 G-4 G-4 E-4 G-2
CONN 28 CONN 29 CONN 30 CONN 31
G-2 G-4 F-2 E-2
CONN 99 CONN 100 CONN 101 CONN 102 CONN 103
I-1 I-1 I-1 I-1 I-1
The connectors shown in this chart are for harness to harness connectors. Connectors that join a harness to a component are generally located at or near the component. See the Component Location Chart.
Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The circle indicates that the component has screw terminals and a wire can be disconnected from it. Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.). No circle indicates that the wire cannot be disconnected from the component. Ground (Wired): This indicates that the component is connected to a grounded wire. The grounded wire is fastened to the machine. Ground (Case): This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine. 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.
T
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. 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. Magnetic Latch Solenoid: A magnetic latch solenoid is an electrical component that is activated by electricity and held latched 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.
Harness and Wire Symbols Wire, Cable, or Harness Assembly Identification: Includes Harness Identification Letters and Harness Connector Serialization Codes (see sample).
Harness Identification Letter(s): (A, B, C, ..., AA, AB, AC, ...)
L-C12 3E-5179
AG-C4 111-7898
L-C12 3E-5179
1
Part Number: for Connector Plug
Harness Connector Serialization Code: The "C" stands for "Connector" and the number indicates which connector in the harness (C1, C2, C3, ...).
Part Number: for Connector Receptacle
2 Plug
Receptacle Pin or Socket Number
1 2
Deutsch connector: Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
1 2
Sure-Seal connector: Typical representation of a Sure-Seal connector. The plug and receptacle contain both pins and sockets.
5A Fuse (5 Amps)
9X-1123
Component Part Number
325-AG135 PK-14
© 2017 Caterpillar All Rights Reserved
Harness identification code: This example indicates wire group 325, wire 135 in harness "AG".
Wire Gauge Wire Color
CAT, CATERPILLAR, their respective logos, “Caterpillar Yellow”, and the POWER EDGE trade dress as well as corporate and product identity used herein, are trademarks of Caterpillar and may not be used without permission.
(Dimensions: 56 inches x 35 inches)
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UENR8062 VOL 1 of 4
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CONN 13 CONN 4