5
47
6
7 CONN 20 CONN 21 CONN 19 CONN 33
2
1
CONN 24
CONN 23 Component Location - Volume 1
16
39
Block - Fuse 1
Schematic Location H-3
Machine Location 1
Block - Fuse 2
E-3
2
Port - Power 12V
Breaker - Air Conditioning
D-4
3
Relay - Brake Retract
Component
CONN 32
CONN 14
14
CONN 8
40 45
25
CONN 12
41 18
CONN 22
Component Passthru - Cab
Schematic Location E-3
Machine Location 27
I-1
28
H-14
29 30
Breaker - Brake Retract
D-4
4
Relay - Heated Miror
I-14
Control - Brake
D-12
5
Relay - High Beam
I-14
31
Control - Chassis
D-6
6
Relay - Key Switch
J-14
32
Control - Primary Steering
D-5
7
Relay - Key Switch Enable
J-14
33
Control - Transmission
D-10
8
Relay - Main Power
E-4
34
Converter - 20A
I-12
9
Relay - Windows Down
I-14
35
Diode - Horn Solenoid
I-12
10
Relay - Windows Up
I-14
36
Display - LH Digital Payload
E-11
11
Resistor - LH Turn
I-1
37
Flasher
J-15
12
Resistor - RH Turn
H-1
38
Ground - Case
D-12
13
Resistor - Start Aid 1
D-4
39
Ground - Case 1
D-5
14
Resistor - Start Aid 2
D-4
40
Ground - Case 2
D-10
15
Sensor - Brake Air Press
J-16
41
Ground - Case 3
D-6
16
Sensor - Secondary Brake Pedal
I-12
42
Ground - Rear Cab Boss
E-6
17
Sensor - Service Brake Pedal
J-16
43
Ground - Rear Cab Boss 2
E-6
18
Sensor - Throttle Position
I-1
44
Lever - Retarder
I-1
19
Solenoid - Auto Lube
I-16
45
Module - Wiper Delay
H-1
20
Solenoid - Horn
I-12
46
Motor - Blower
J-1
21
Switch - Ethernet 4
D-3
47
Motor - Washer
I-1
22
Switch - Horn
H-1
48
Motor - Wiper
H-1
23
Switch - Power Window
J-3
49
Motor - Power Window
J-3
24
Switch - Steering Column
G-1
50
Outlet - Power 12V
D-4
25
Switch - Thermostat
J-1
51
Outlet - Power 24V
A-16
26
793D Off-Highway Truck CMD Electrical System FDB1-UP
3
CONN 13
A 4 CONN 25
CONN 26
10
46
15
12
13
17
CONN 9
CONN 15 CONN 34 CONN 10
CONN 28
VIEW OF AREA “A”
Volume 1 of 5: Cab
MAIN CAB
PUBLICATIONS.CAT.COM
FUSE PANEL
Harness And Wire Electrical Schematic Symbols Symbols
T
Pressure Symbol
Connector Location - Volume 1
CONN 1
Schematic Location I-16
CONN 2
H-16
Connector Number
21
51
49
B 34
CONN 17 CONN 18 CONN 16 CONN 6 CONN 4 CONN 1 CONN 3
31 32
33
29
30
35
36
27
26
19
23 11
48 50 CONN 38 CONN 37 20
CONN 35
CONN 36 VIEW OF AREA “C”
(ROTATED FOR CLARITY)
C
43
38
37
VIEW OF AREA “B”
44
28
42
CAB - FRONT VIEW
F-16
CONN 4
E-16
CONN 5
D-16
CONN 6
C-16
CONN 7
B-16
CONN 8
A-15
CONN 9
I-15
CONN 10
J-15
CONN 11
I-12
CONN 12
F-11
CONN 13
F-11
CONN 14
F-11
CONN 15
B-8
CONN 16
J-6
CONN 17
H-6
CONN 18
G-6
CONN 19
E-5
CONN 20
E-5
CONN 21
E-5
CONN 22
F-5
CONN 23
F-5
CONN 24
F-5
CONN 25
J-4
CONN 26
J-4
CONN 27
C-4
CONN 28
B-4
CONN 29
B-4
CONN 30
D-3
CONN 31
J-2
CONN 32
D-2
CONN 33
C-2
CONN 34
C-2
CONN 35
E-1
CONN 36
E-1
CONN 37
F-1
CONN 38
G-1
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. 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 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.
(PARTS REMOVED FOR CLARITY)
CONN 2 CONN 5 CONN 7
CAB - LEFT SIDE VIEW
22
24
CONN 31
CONN 3
Temperature Symbol
AIR CONDITIONING
5A 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.
Fuse (5 Amps)
9X-1123
Component Part Number
325-AG135 PK-14 Harness identification code: This example indicates wire group 325, wire 135 in harness "AG".
Wire Gauge* Wire Color
*Wire gauge is shown in AWG (American Wire Gauge) but could also be shown in metric denoted with mm
© 2021 Caterpillar. All Rights Reserved. CAT, CATERPILLAR, LET’S DO THE WORK, their respective logos, “Caterpillar Corporate Yellow”, the “Power Edge” and Cat “Modern Hex” 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)
8
CONN 27 CONN 30
42 Page,
9
CONN 11
CONN 29
M0120255-01 VOL 1 of 5
M0120255-01 February 2021