Page 1
INTERACTIVE SCHEMATIC
Bookmarks
Features
Cover Page
Information
Component Table
Tap Table
Fluid Power Symbols
Electrical Symbols
Schematic
Machine Views
Front Frame
Rear Frame
Tap Views
X
Options
The Bookmarks panel will allow you to
quickly navigate to points of interest.
EC-C2
EC-C3
E-C60
E-C61
This document is best viewed at a
screen resolution of 1024 X 768.
To set your screen resolution do the following:
RIGHT CLICK on the DESKTOP.
Select PROPERTIES.
CLICK the SETTINGS TAB.
MOVE THE SLIDER under SCREEN RESOLUTION
until it shows 1024 X 768.
CLICK OK to apply the resolution.
Click on any text that is BLUE and underlined.
These are hyperlinks that can be used to navigate the schematic and machine views.
EC-C1
VIEW ALL CALLOUTS
HOTKEYS (Keyboard Shortcuts)
FUNCTION
Zoom In
Zoom Out
Fit to Page
Hand Tool
Find
When only one callout is showing on a machine view this
button will make all of the callouts visible. This button is
located in the top right corner of every machine view page.
KEYS
“CTRL” / “+”
“CTRL” / “-”
“CTRL” / “0” (zero)
“SPACEBAR” (hold down)
“CTRL” / “F”
Page 2
SENR9258-02
October 2017
320B and 320B L Excavator
Electrical System
320B:
3MR1-UP
4NR1-UP
5BR1-UP
9KR1-UP
1CS1-UP
8ES1-UP
4XW1-UP
320B L:
AED1-UP
4MR1-UP
6CR1-UP
9CS1-UP
5GW1-UP
2WZ1-UP
©
2017 Caterpillar, All Rights Reserved
Printed in U.S.A.
Page 3
COMPONENT LOCATION
Page 1 of 2
Component
uator - Engine Governor
Act
Air Inlet Heater
Alarm - ATCH Travel
Alternator
Antenna ATCH
Assembly - Terminal Block
Batteries - 12VDC
Breaker - Alternator
Breaker - Main
Cable - ATCH Antenna
Control - ATCH Power Window
Control - Engine/Pump
Controller - Wiper/Washer
Converter - ATCH 12V Voltage
Converter ATCH
Diode Switch - Air Cleaner Flow
Diode - Main Relay Switch - ATCH Refueling Start
Fuses Switch - ATCH Refueling Stop
Heater - ATCH Seat with Seat Heater Switch - ATCH Fine Swing Control
Horn Switch - ATCH
Lamp - ATCH C
Lamp - Chassis Switch - ATCH Lower Washer
Lighter Switch - ATCH Lower Wiper
Meter - Service Switch - ATCH Power Window limit
Monitor Switch - ATCH Refueling
Motor - ATCH Lower Washer Switch - ATCH Seat Heater
Motor - ATCH Lower Wiper Switch - ATCH Aux Hydraulic Pressure
Motor - Starter Switch - Boom Raise Pressure
Motor - Washer Switch - ATCH Flow Control Pressure
Motor - Wiper Switch - Coolant Level
Pi
ckup - Engine Speed S
Pump - ATCH Auto Lubrication Switch - Crush Pressure #2
Pump - ATCH Refueling Switch - Engine Oil Press
Radio - ATCH 12VDC
Relay - ATCH Flow Control
Relay - ATCH Refueling Power
Relay - ATCH Refueling Start
Relay - ATCH Refueling Stop
Relay - Boom Lamp I-7 D
ab Switch - ATCH Heater Panel
Schematic
Location
A-9 1
C-8 2
G-9 3
B-8 4
C-6 5
F-8 D
I-8 , H-8 6
I-8 D
I-8 D
G-6 , I-3 5
C-6 15
F-2 7
E-1 A
H-6 9
H-3 8
A-3 18 H-9 35
H-7 D A-4 42
I-5 C A-4 44
F-4 43 D-4 B
A-2 10 H-1 G
G-1 12 H-5 C
A-2 13 D-3 B
E-1 A D-3 B
F-1 A B-6 A
F-1 A A-4 41
I-9 D D-4 B
I-1 G H-1 G
A-9 14 D-8 34
I-9 D H-1 G
E-1 A H-9 36
B-9 29 H-1 G
H-9 16 G-1 G
A-2 17 B-9 38
I-3 C
E-7 D
A-3 18
A-3 19
A-3 20
Machine
Location
Component
Sensor - A/C Photo
Sensor - Air Inlet Heater Coolant Temp
Sensor - Fuel Level
Sensor - Pump Discharge Press
Socket 12V
Solenoid - A/C Clutch
Solenoid - ATCH Crush
Solenoid - ATCH Flow Control
Solenoid - ATCH Fine Swing
Solenoid - H
Solenoid - Level Finish
Solenoid - Swing Brake
Solenoid - Travel Speed
Solenoid - Trenching
Switch - A/C Panel
witch - Crush Pressure #1
Switch - Horn
Switch - Hydraulic Oil Filter
Switch - Hydraulic Oil Level
Switch - Implement Pressure
Switch - Key
Switch - Neutral Start Limit I-1 C
ydraulic Lock
Hammer Pressure
Machine locations are repeated for components located close together.
A - Located in the cab.
B - Located in the lefthand console.
C - Located in the righthand console.
E - Located on or near hydraulic oil tank.
F - Located on or near pilot manifold.
G - Located on or near bottom platform.
D - Located on or near relay panel.
Schematic
Location
F-1 A
C-9 21
A-5 23
B-8 24
H-6 A
C-9 26
D-8 31
D-7 29
E-7 28
I-1 G
A-7 F
E-7 32
A-7 F
A-7 F
H-5 C
I-1 C
A-5 E
A-5 E
D-8 39
F-2 B
Machine
Location
Page 4
COMPONENT LOCATION
Page 2 of 2
Component
Relay - Cab/Chassis Lamp
Relay - Demolition
Relay - Fan
Relay - Heater
Relay - Horn
Relay - Hydraulic Lock Solenoid
Relay - Main
Relay - Neutral Start
Relay - Start
R
elay - Start Cont
Relay - Timer
Resistor - Backup
Sender - Coolant Temperature
Sender - Hydraulic Oil Temp A-5 E
Schematic
Location
I-7 D
E-8 D
I-7 D
F-7 D
I-7 D
I-7 D
G-7 D
F-7 D
F-8 D
E-8 D
E-7 D
I-7 D
B-8 22
Machine
Location
Switch - One Touch Low Idle
Switch - Power Window Limit
Switch - Travel Pressure
Switch - Throttle Position E-3 B
Switch - Window Limit
Switch Panel
Switch-Refrigerants Low Pressure
Unit - A/C, Heater
nit - ATCH Heater
U
Unit - Heater Control
Valve - Pressure Reducing Solenoid
Machine locations are repeated for components located close together.
A - Located in the cab.
B - Located in the lefthand console.
C - Located in the righthand console.
E - Located on or near hydraulic oil tank.
F - Located on or near pilot manifold.
G - Located on or near bottom platform.
D - Located on or near relay panel.
Component
Schematic
Location
F-2 B
D-3 A
D-8 45
D-1 A
F-2 B
I-9 40
H-5 21
H-5 46
H-7 D
A-7 F
Machine
Location
Page 5
CONNECTOR LOCATION
CONN 1
CONN 2
CONN 3
CONN 4
CONN 5
CONN 6
CONN 7
CONN 8
CONN 9
CONN 10
CONN 11
CONN 12
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
CONN 28
CONN 29
CONN 30
CONN 32
CONN 33
CONN 34
CONN 35
CONN 36
Connector Number
Schematic
Location
A-9 1
F-9 D
F-9 14
G-9 D
G-9 D
H-8 D
G-8 A
G-8 A
F-8 A
H-6 G
C-6 A
C-6 A
C-5 A
C-5 A
F-5 A
F-5 G
F-5 A
F-5 G
F-4 G
F-4 G
H-5 G
H-5 G
H-4 G
H-4 G
H-4 G
H-4 G
B-4 23
A-4 42
A-4 20
B-3 47
C-2 49
C-2 G
C-2 G
C-2 G
B-3 D
Machine
Location
Page 6
CID / MID / FMI
Code Description Of Problems
1301 Engine oil pressure too low
3102 Engine coolant temperature is too high
1303 Hydraulic oil temperature is too high
1304 Air filter is clogged
1305 Battery voltage is not normal
2201 Governor actuator feedback sensor circuit is open or shorted battery voltage
2202 Governor actuator feedback sensor is shorted to body ground
2301 Governor actuator feedback signal is not sta
2302 Gove
2303 Governor actuator does not move
2304 Calibration data error
3201 Monitor RAM is not normal
4101 Electric power supply to the controller is too much(43 volts)
4102 Over-current in proportional reducing valve
4103 Proportional reducing valve circuit is open
4105 Over-current in digital output (trenching solenoid)
4106 Over-current in digital output (fi
4
107 Over-current in digital output (Travel speed change solenoid)
4108 Over-current in digital output (travel alarm)
410A Over-current in digital output (swing brake solenoid)
4201 Engine speed is not normal
4202 Engine coolant temperature sensor is shorted to body ground
4203 Hydraulic oil temperature sensor is shorted to body ground
4204 PWM sensor of pump delivery pressure is op
207 PWM sensor of pump delivery pressure is open in circuit
4
420A Fuel sensor is shorted to ground
420B Fuel sensor is open or shorted to battery voltage
420C Electric power supply is too low (below 23 volts)
420D Electric power supply is too high (above 32 volts)
420E Engine speed dial is not one of the specified 10
4301 Data mismatch 1 between alternator and speed sensor (alternator
302 Data mismatch 2 between alternator and speed sensor (speed sensor is abnormal)
4
4303 Engine stalls
A201 Monitor communication is not normal
A202 Monitor takes to much time to respond to controller's signal
A203 Communication is abnormal in controller
Real Time Error Codes
ble
rnor actuator feedback signal deviates
ne control solenoid)
en in circuit
is abnormal)
Page 7
SPECIFICATIONS AND RELATED MANUALS
Resistor, Sender and Solenoid Specifications
Part No. Component Description Resistance (Ohms)¹
102-8016 Resistor: Backup 47.0 ± 2.35
107-7056 Solenoid: Fine Swing 34.0 ± 0.5
111-9916 Solenoid: Engine/Pump Control 11.7 ± 1.2
121-1490 Solenoid:
121-1491 Solenoid:
122-4459 Solenoid: Flow Control 34.3 ± 1.7
¹ At room temperature.
Part No. Function Actuate Deactuate Contact Position
106-0179
106-0180
106-0181
113-344
Travel Pressure
Implement Pressure
Boom Raise Pressure
Flow Control Pressure
Aux. Hydraulic Pressure
Hammer Pressure
Refrigerant High/ Low Pressure
Level Finish
Trenching
Hydraulic Lock
Swing Brake
Travel Speed
Off Machine Switch Specification
1520 ± 98 kPa 1127 kPa Min
220.5 ± 14 psi 163.5 psi
2646 ± 196 kPa 2156 ± 196 kPa
383.8 ± 28.4 psi 312 ± 28.4 psi
490 ± 49 kPa 290 kPa
71 ± 7.1 psi 42 psi
196 ± 1340 kPa -
28.4 ± 455.4 psi -
32 ± 3.2
32 ± 3.2
Normally Open
Normally Open
Normally Open
Normally Open
Related Electrical Service Manuals
Title
Engine/Pump Control SENR9291
Starting and Charging RENR1007
Form Number
Page 8
WIRE DESCRIPTION
Page 1 of 2
Wire
Number
101 RD Bat (+) (Not Application Specific) 578 BU Washer -Aux
103 RD Dome Lamp Ckt 586 BR Aux Hyd -Close
105 RD Key Start Sw 590 GY Wiper SW To Intermittent Module
107 RD Eng Shut -Down Fire Suppr 592 BU DC/DC Converter Power Output
109 RD Alt Output (+) Term. A513 RD DC/DC Converter Memory Output
111 RD Engine Pump Control Ckt A537 PK S
112 PU Main Power Rly Output A579 OR Wiper Motor +
113 OR Opr Mon Panel VMIS B+ Switched A580 BR Wiper Motor 114 RD Warning Horn (Forward) A581 GN Wiper Motor Raise
115 PK Cab / Chassis Ckt A582 PU Wiper Motor Stop
118 GY Washer / Wiper Ckt A583 YL Power Window Interlock To Wiper Cont
120 YL Converter Ckt A584 BU Front Window Limit SW To Wiper Cont
124 GN A/C /
129 BU Cigar Lighter Ckt A587 YL Power Window Cont To Safety Sol Relay
135 BU 12V 5A Output Ckt A588 GN Safety Sol Relay To Sol
140 BU Lubrica
147 PU Fine Swing / Flow Control Ckt A590 BU Power Window Down
149 PU Boom Lamp Ckt A591 PU Rear Window Limit SW
150 RD Bat (+) C468 BU Engine Oil Level
151 GN Hyd Lock / Neutral Start Ckt C5
152 BU Lower Washer / Wiper Ckt C538 OR Hazard Indicator
154 RD Neutral Start / Neutral Start Ckt 607 PK Flood Lamp -Front
168 RD Refueling Pump Ckt 615 YL Cab Flood Lamp/Rops
172 RD Engine Governor 616 BU Bucket Flood Lamp/Boom Flood Lamp
175 RD Fan Ckt
176 YL Aux Ckt 763 BU Torque Converter SW
177 RD Main Brkr 786 GN Eng Speed Cont -Hi Press SW
180 GN Aux Ckt 788 YL Eng Speed (
185 YL Back
189 RD Hyd Lock Ckt A718 PU Start Aid Coolant Sensor Signal
191 WH Power Window Ckt A755 PK Throttle SW #1
196 BU Insp. Lamp Ckt A756 BU Throttle SW #2
200 BK Main Chassis A758 BR Throttle SW #4
201 BK Operator Monitor Return A761 PU Electronic Pump Cont Throttle Ground
235 BK Electronic Pump Ctrl Gnd A762 PU Electronic Pump Cont En
304 WH Starter Relay No. 1 Output A769 GY Pump Control Valve #2 (-)
306 GN Starter Relay Coil To Neut Start SW Or A770 PK Electronic Pump Control Bypass SW To Resistor
307 OR Key Start SW To Neutral Start SW Or A771 PU Float SW
308 YL Main Power Relay Coil 877 YL Glow Plug Magnetic SW To Glow Plug
309 GY Alternator Regulator Term. 950 BR Right Console Comp
10 PU Start Aid SW To Start Aid Sol 951 PK Right Cont Handle SW To Relay/Diode
3
320 OR Horn Relay Coil To SW 954 GN Right Console Eng Throttle SW To Relay/Diode
321 BR Backup Alarm Lamp Travel Alarm F771 OR Backup SW
322 GY Warning Horn (Forward) F772 WH Backup SW
323 WH Fuel Pump Power F773 OR Governor Accel
325 PK Fuel Pump Relay Cut-Out F774 WH Governor Decel
326 PU Key Start SW
330 YL Neutral Start Relay Coil G974 WH Crush Sol to Demolition Relay
329 YL Fuel Pump To SW G975 YL Crush Press SW to Demolition Relay
365 YL Fuel Pump Relay To Switch J703 PK Alt Pulse Sig To Anti-Start Relay (was D746 PK)
Wire
Color
Description
Power Distribution Circuits Lighting Circuits
Heater Ckt A586 OR Wiper SW To Wiper Cont
tor Ckt A589 OR Power Window Up
up Ckt 791 PK Eng Speed Cont -Lo Sol
Ground Circuits
Basic Machine Circuits
C" Term. " G973 OR Boom Raise
Wire
Number
37 GN Turn Signal SW To Flash
A757 GY Throttle SW #3
A768 BU Pump Control Valve
Wire
Color
eat Heater (Resi
Control Circuits
+)
Press SW to Crush Press SW
Description
stive Element In Cushion)
er
g Speed Ground
#1 (+)
actor SW To Relay/Diode
Page 9
WIRE DESCRIPTION
Page 2 of 2
Wire
Number
403 GN Alternator (R) Term.
405 GY Opr Mon Oil Press. (Low Setting)
412 BU Opr Mon Cool Flow/Ds2 App Spec)(Pin 26)HEUI-ADEMI
430 BU Opr Mon Air Filter
487 OR Hyd Oil Flow SW
491 PK VMIS Hyd Oil Temp Senso
492 GY VMIS Coolant Temp Sensor Signal
495 GN VMIS Fuel Level Signal
496 WH Opr Mon Panel Hyd Oil Level
501 GN Wiper -Front (Low)
506 PU
508 PU Radio Speaker -Left
509 WH Radio Speaker -Left (Common)
511 BR Radio Speaker -Right
512 GN Radio Speaker -Right (Common)
513 OR A/C Compressor/Refrigerant Pressure SW
519 PK Thermost
530 OR Washer Right
Wire
Color
Wash
Description
Monitoring Circuits
r
Accessory Circuits
er -Front
at To Refrigerant Press. SW
Wire
Number
K904 GN Pump Discharge -Signal
K905 RD Pump Discharge -+B
K906 GN SW To SW (Generic)
K907 BU XMSN Cont Fwd SW To Gnd
K909 BU XMSN Cont Rev SW To Gnd
K911 PK XM
K912 GN XMSN Cont Speed 3 SW To Gnd
K915 GN XMSN Cont Speed 4 SW To Gnd
K997 BU XMSN Cont Neut SW To Gnd
L908 OR XMSN Cont Pk Brk Lever SW To Gnd
L909 BU Impl Cont SW To Gnd N.O.
L968 OR Impl Cont SW To Gnd N.C.
L969 WH XMSN Cont Speed 1 SW To Gnd
L970 GY Injector Diode To Injector 14
L971 GN Impl Cont Lift Proportional Sol
L972 BU Impl Cont Lower Proportional Sol
L973 GN Impl Cont Sol Return
L974 GN Impl Cont Pilot Press So
L975 OK Serial Data (Transmit)
L976 GN Serial Data (Receive)
Wire
Color
Description
Control Circuits
SN Cont Speed 2 SW To Gnd
l
Page 10
HARNESS and WIRE
Electrical Schematic Symbols
Symbols
Pressure
Symbol
T
T
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.
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.
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
internal switch that places the latch coil circuit open at the time the coil latches.
Wire, Cable, or Harness Assembly Identification:
Includes Harness Identification Letters and Harness
Connector Serialization Codes (see sample).
Part Number: for
Connector Plug
Plug
Deutsch connector: Typical representation
1
of a Deutsch connector. The plug contains all
2
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.
AG-C4
111-7898
electromagnet when current flows through them. It also has an
Harness and Wire Symbols
1
2
L-C12
3E-5179
Receptacle
Pin or Socket Number
L-C12
3E-5179
Fuse (5 Amps)
Harness identification code:
This example indicates wire group 325,
wire 135 in harness "AG".
Harness Identification Letter(s): (A, B, C, ..., AA, AB, AC, ...)
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
5A
9X-1123
Component
Part Number
325-AG135 PK-14
Wire Gauge
Wire Color
Page 11
(D) ATCH LOWER
WASHER MOTOR
200-BK-18
200-BK-18
I
H
(D) WASHER MOTOR
(40) REFRIGERANT
LOW PRESSURE SWITCH
105-9344 (NOTE A, NOTE L)
(36) CONSTANT
LEVEL SWITCH
096-0744
B
200-BK-18
412-BU-18
(16) ATCH AUTO
LUBRICATION PUMP
127-5264
GROUND
2
200-BK
G
200-BK
200-BK-18
200-BK-18
200-BK
(3) ATCH
TRAVEL ALARM
3E-7738
F
E
D
C
B
A
KEY
DECEL
ACCEL
F/B
+B
GND
(1) ENGINE GOVERNOR
ACTUATOR
119-0633
9 8 7 6 5 4 3 2 1
7T-8890
MOTOR
578-BU-18
A
A
MOTOR
506-PU-18
AA
7T-8890
(NOTE K)
OR
PK
ON(KEY)1
BU
140-
200-BK-18
2
1
513-OR-18
AG
2
1
1
2
B
513-OR-18
519-PK-18
(35) AIR CLEANER
FLOW SWITCH
109-9330
B B B
430-BU-18
200-BK-18
200-BK
140-BU
430-BU-18
412-BU-18
519-PK-18
513-OR-18
321-BR-18
L50
B
200-BK-18
321-BR-18
L29
L41
L42
L44
(21) AIR INLET HEATER
COOLANT TEMPERATURE SENSOR
B
788-YL-18
A762-PU-18
513-OR-18
200-BK-18
1
2
B
(38) ENGINE OIL PRESSURE
SWITCH
5I-8005
(29) ENGINE SPEED
PICKUP
125-2966
B
WH
1
BK
2
A762-PU-18
788-YL-18
405-GY-18
513-OR-18
308-YL-18
6
F774-WH-18
5
F773-OR-18
4
A761-PU-18
3
172-RD-18
1
200-BK-18
2
B
CONN 1
9 8 7 6 5 4 3 2 1
L16
L15
G975-YL-18
G973-OR-18
(6) 12 VDC
BATTERIES
BATTERIES
G975-YL-18
G973-OR-18
506-PU-18
578-BU-18
200-BK
116-BR-14
177-RD
-14
177-RD-14
A770-PK-18
189-RD
114-RD-18
320-OR-18
149-PU
786-GN-18
154-RD-18
615-YL
791-PK-18
115-PK-14
307-OR-18
308-YL-18
111-RD-14
306-GN-18
235-BK-18
L908-OR-18
L909-BU-18
51-GN-18
1
150-RD-18
A588-GN-18
A587-YL-18
K909-BU-18
196-BU
L975-PK-18
177-RD-14
200-BK-18
586-BR-18
147-PU-18
L973-GN-18
112-PU-6
K997-BU-18
763-BU-18
L977-YL-18
GY-18
L978L974-GN-18
A771-PU-18
K906-GN-18
L15
430-BU-18
K904-GN-18
A761-PU-18
F773-OR-18
F774-WH-18
CONN 4
140-BU
168-RD-14
L971-GN-18
103-RD-18
107-RD
310-PU-18
172-RD-18
487-OR-18
A768-BU-18
412-BU-18
321-BR-18
CONN 3
519-PK-18
492-GY-18
405-GY-18
C468-BU-18
A762-PU-18
788-YL-18
403-GN-18
326-RD
495-GN-18
496-WH-18
491-PK-18
A769-GY-18
CONN 2
109-RD-6
101-RD-4
877-YL-4
304-WH-8
L49
607-PK-18
322-GY-18
616-BU
309-GY-18
A718-PU-18
308-YL-18
J703-PK-18
403-GN-18
140-BU
430-BU-18
412-BU-18
L50
519-PK-18
321-BR-18
200-BK
513-OR-18
513-OR-18
200-BK
403-GN-18
308-YL-18
J703-PK-18
877-YL-4
A718-PU-18
492-GY-18
309-GY-18
109-RD-6
L44
304-WH-8
101-RD-4
C468-BU-18
A762-PU-18
788-YL-18
405-GY-18
F774-WH-18
F773-OR-18
A761-PU-18
172-RD-18
K997-BU-18
L42
K904-GN-18
A769-GY-18
A768-BU-18
L41
L978-GY-18
763-BU-18
L977-YL-18
491-PK-18
L29
487-OR-18
496-WH-18
168-RD-14
607-PK-18
L30
322-GY-18
616-BU
495-GN-18
K906-GN-18
L974-GN-18
A771-PU-18
L971-GN-18
L30
125-2982
(14) STARTER MOTOR
T
(26) A/C CLUTCH
SOLENOID
117-6353 (NOTE L)
154-0490 (NOTE K)
5I-8071 (35A) - NOTE L
5I-8085 (50A) - NOTE K
B
200-BK-18
200-BK-18405-GY-18
125-2988
L43
GROUND STRAP
132-1805
200-BK-18
200-BK-18
200-BK
200-BK-18
A
CHASSIS
BB
AA
POS NEG SOP GEN
AB
(NOTE J)
2
1
CONN 5
1
2
AC
B
1
2
3
4
5
6
7
8
9
10
11
12
7
12
10
4
5
6
9
8
11
3
1
2
B A
L51
1
2
3
4
5
6
7
8
9
10
11
12
B
L51
(2) AIR INLET HEATER
B
A718-PU-18
1
200-BK-18
2
(22) COOLANT
5I-7578
S G
RTM TAB
MOTOR
RD-00
FF (NOTE C)
2
1
309-GY-18
T
492-GY-18
B
304-WH-8
B
101-RD-4
RD-00
RD-00
B
ENG OIL
LEVEL SW
111-4760
RD-00
3T-5760
EE (NOTE C)
RD-00
(6) ATCH
12 VDC
3T-5760
(NOTE C)
A
A
A
A
(4) ALTERNATOR
TEMPERATURE SENDER
DISCONNECT SW.
7N-0718
7N-0719(NOTE C)
GG
(NOTE C)
CC
BK-00
POS NEGSOP GEN
GG (NOTE C)
RD-00
AC
L16
L45
L49
L45
147-PU-18
B
877-YL-4
5I-7746
109-RD-6
J703-PK-18
B
403-GN-18
B
B
L
B
P
ALT
R
B
E
B
200-BK-6
200-BK-18
B B
AA
EE (NOTE C)
(D) MAIN
BREAKER
9S-0174
SS
101-RD-6101-RD-6
(D) ALT
BREAKER
9S-0174
SS
WW
BK-00
177-RD-14
177-RD-14
A770-PK-18
189-RD
114-RD-18
320-OR-18
149-PU
786-GN-18
154-RD-18
615-YL
791-PK-18
115-PK-14
307-OR-18
308-YL-18
111-RD-14
235-BK-18
306-GN-18
116-BR-14
151-GN-18
150-
RD-18
A588-GN-18
A587-YL-18
L908-OR-18
L909-BU-18
CONN 7
177-RD-14
200-BK
K909-BU-18
L975-PK-18
196-BU
L16
147-PU-18
950-BR-18
CONN 8
112-PU-6
109-RD-6
101-RD-4
877-YL-4
304-WH-8
(D) TERMINAL
ASSEMBLY
121-1023
A718-PU-18
607-PK-18
322-GY-18
616-BU
309-GY-18
J703-PK-18
403-GN-18
308-YL-18
CONN 9
951-PK-18
G975-YL-18
G974-WH-18
K906-GN-18
L974-GN-18
A771-PU-18
L971-GN-18
200-BK-18
200-BK-18
B
200-BK-18
2
C468-BU-18
1
60A
D
60A
A
BLOCK
G974-WH-18
RELAY PANEL
(D) BACKUP RESISTOR
K909-BU-18
K909-BU-18
A770-PK-18
235-BK
L909-BU
L908-OR
791-PK-18
115-PK-14
YY (NOTE N)
AL (NOTE P)
615-YL
607-PK-18
320-OR-18
177-RD-6
177-RD-14
VV
109-RD-6
4
5
6
10
11
12
A
1
2
3
4
5
6
7
8
9
10
11
12
A
10
11
12
Y
A
B
B
B
B
B
9
2
3
4
5
10
11
7
6
8
1
12
LL Z
147-PU-18
114-RD-18
322-GY-18
116-BR-14
200-BK-18
177-RD-14
308-YL-18
308-YL-18 177-RD-14
200-BK-18
L52
151-GN-18
150-RD-18
A588-GN-18
A587-YL-18
786-GN-18
149-PU
616-BU
A718-PU-18
200-BK-18
L975-PK-18
306-GN-18
310-PU-18
200-BK-18
308-YL-18
308-YL-18
308-YL-18
L52 L52
CONN 6
1
2
3
7
8
9
C (NOTE N)
AJ (NOTE P)
C (NOTE N)
AJ (NOTE P)
177-RD-14
7
200-BK
2
1
6
C
3
(NOTE N)
8
AJ
9
(NOTE P)
4
5
Z
UU (NOTE N)
AK (NOTE P)
VV
WW
JJ
KK
X
X
C
(NOTE N)
AJ
(NOTE P)
L48
CA DA
1
2
(D) START
CONROL RELAY
094-2080
S
R
GND
L
P
L973-GN-18
147-PU-18
L974-GN-18
200-BK-18
A771-PU-18
200-BK-18
L971-GN-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
AC
2
1
L43
(24) PUMP DISCHARGE
PRESSURE SENSOR
L42
L43
SIS CONNECTOR
200-BK
RELAY PANEL
177-RD-14
177-RD-14
A770-PK-18
114-RD-18
320-OR-18
786-GN-18
154-RD-18
791-PK-18
115-PK-14
307-OR-18
308-YL-18
111-RD-14
116-BR-14
151-GN-18
150-RD-18
A588-GN-18
A587-YL-18
L908-OR
L909-BU
K909-BU-18
L975-PK-18
607-PK-18
322-GY-18
L48
309-GY-18
A718-PU-18
308-YL-18
403-GN-18
J703-PK-18
310-PU-18
330-YL-18
306-GN-18
304-WH-8
2
1
ZZ
(NOTE N)
AM
(NOTE P)
XX
(D) START RELAY
125-1302
(D) DEMOLITION RELAY
111-4871 (NOTE M)
WH/BU
WH/GN
BK
YL
WH/YL
CA M
2
1
B
1
2
B
1
2
B
1
2
200-BK-18
(31) ATCH CRUSH
SOLENOID
(NOTE M)
877-YL-4
A718-PU-18
309-GY-18
J703-PK-18
109-RD-6
403-GN-18
492-GY-18
304-WH-8
101-RD-4
C468-BU-18
A762-PU-18
788-YL-18
405-GY-18
308-YL-18
513-OR-18
F774-WH-18
F773-OR-18
A761-PU-18
172-RD-18
200-BK
200-BK-18
200-BK-18
200-BK-6
106-0178
SIGNAL
GROUND
+B
BK-18
BR-18
YL-18
A
B
C
B
200-BK-18
K904-GN-18
K997-BU-18
L41
A769-GY-18
A768-BU-18
L978-GY-18
763-BU-18
L977-YL-18
200-BK-18
200-BK-18
200-BK-18
K909-BU-18
K909-BU-18
A770-PK-18
235-BK
L909-BU
L908-OR
(D) FAN RELAY
200-BK-18
308-YL-18
308-YL-18
116-BR-14
177-RD-6
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
189-RD
149-PU
615-YL
235-BK
616-BU
330-YL-18
309-GY-18
309-GY-18
200-BK-18
J703-PK-18
403-GN-18
L44
L44
200-BK
200-BK-18
200-BK-18
200-BK-18
200-BK-18
102-8016
B
C
D
A
E
111-4871
A718-PU-18
L975-PK-18
200-BK-18
330-YL-18
200-BK-18
309-GY-18
309-GY-18
177-RD-8
J703-PK-18
RELAY PANEL
(34) BOOM RAISE
PRESSURE SWITCH
106-0180
(39) IMPLEMENT
PRESSURE SWITCH
106-0179
(45) TRAVEL
PRESSURE SWITCH
106-0179
200-BK-18
GROUND STRAP
132-1806
200-BK-18
200-BK-18
200-BK-18
200-BK-18
B
CHASSIS
L977-YL-18
1
(F) LEVEL FINISH
SOLENOID
121-1490
200-BK-18
(D) CAB / CHASSIS LAMP RELAY
111-4871
607-PK-18
791-PK-18
115-PK-14 114-RD-18
615-YL
(D) HYD LOCK SOLENOID RELAY
111-4871
A587-YL-18
200-BK-18
151-GN-18
8
150-RD-1
A588-GN-18 616-BU
235-BK
615-YL
Y-18
149-PU
616-BU
189-RD
309-GY-18
112-PU-6
200-BK-18
308-YL-18
K909-BU-18
121-1491
TEMP.
REGULATOR
INDICATOR
KEY SW.(START)
RELAY
GND
KEY SW.(ON)
CHECK TERM.
310-PU-18
307-OR-18
200-BK-18
306-GN-18
154-RD-18
154-RD-18
307-OR-18
951-PK-18
950-BR-18
147-PU-18
147-PU-18
147-PU-18
308-YL-18
200-BK-18
K909-BU-18
189-RD
111-RD-14
177-RD-14
L973-GN-18
147-PU-18
K906-GN-18
200-BK-18
951-PK-18
951-PK-18
200-BK-18
951-PK-18
200-BK-18
L30
L29
L41
L42
L42
L41
177-RD-6
YY (NOTE N)
AL (NOTE P)
177-RD-8
ZZ (NOTE N)
AM (NOTE P)
177-RD-14
(NOTE P)
L47
L47
JJ KK
200-BK-18
(D) NEUTRAL
START RELAY
Z
M
LL
LL
AC
L30
L29
L978-GY-18
1
(F) TRENCHING
SOLENOID
121-1490
200-BK-18
200-BK-18
306-GN-18
310-PU-18
200-BK-18
308-YL-18
308-YL-18
308-YL-18
308-YL-18
308-YL-18
200-BK-18
177-RD-14
177-RD-14
177-RD-14
1
116-BR-14
K909-BU-18
A770-PK-18
791-PK-18
115-PK-14
607-PK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
151-GN-18
150-RD-18
A588-GN-18
A587-YL-18
320-OR-18
114-RD-18
322-G
786-GN-18
A718-PU-18
L975-PK-18
308-YL-18
310-PU-18
308-YL-18
K909-BU-18
306-GN-18
308-YL-18
308-YL-18
306-GN-18
K909-BU-18
200-BK-18
200-BK-18
154-RD-18
307-OR-18
111-RD-14
200-BK-18
200-BK-18
403-GN-18
J703-PK-18
309-GY-18
200-BK-18
L47
189-RD
403-GN-18
177-RD-14
111-RD-14
147-PU-18
G973-OR-18
ENG
200-BK-18
763-BU-18
1
22
(F) TRAVEL SPEED
200-BK-18
77-RD-14
L908-OR
L909-BU
SOLENOID
(D) HORN RELAY
320-OR-18
322-GY-18
(D) BOOM LAMP
786-GN-18
149-PU
(D) HEATER
CONTROL UNIT
104-3204
(D) MAIN
RELAY DIODE
121-1022
200-BK-18
177-RD-14
177-RD-14
177-RD-14
200-BK-18
(D) MAIN RELAY
3T-0376
(NOTE N)
AJ
(NOTE P)
ATCH
MAIN
RELAY
159-9108
(NOTE P)
AJ
ATCH
MAIN
AY
REL
RESISTOR
163-6616
(NOTE P)
200-BK-18
(D) HEATER
RELAY
9X-8124
877-YL-4101-RD-4
111-4871
200-BK-18
306-GN-18
306-GN-18
Z
950-BR-18
951-PK-18
(D) ATCH FLOW
CONTROL RELAY
111-4871
(D) TIMER RELAY
111-4870
IN 1
2
GND
4
IN 2
1
OUT 2
3
OUT 1
+B
(28) ATCH FINE
2
SWING SOLENOID
1
107-7056
B
(32) SWING
1
BRAKE SOLENOID
2
121-1491
951-PK-18951-PK-18
1
2
1
2
ATCH
BOOM RAISE
PRESS SW
106-0181 (NOTE M)
1
2
200-BK
200-BK-18
L28
200-BK-18
A768-BU-18
A769-GY-18
(F) PRESSURE REDUCING
L16
L15
111-4871
RELAY
111-4871
308-YL-18
308-YL-18
308-YL-18
308-YL-18
UU (NOTE N)
AK (NOTE P)
112-PU-6
309-GY-18
112-PU-18
(29) ATCH FLOW
CONTROL SOLENOID
122-4459
(29) ATCH FLOW
CONTROL SOLENOID
121-6303
(5) ATCH ANTENNA
106-0036
B
-18
CHASSIS
BBBB
2
12
SOLENOID VALVE
111-9916
GROUND STRAP
7G-1060
CHASSIS
PP
(15) ATCH POWER WINDOW
(A) ATCH POWER WINDOW
L30
L28
L29
PLATFORM
CONTROL
117-6305
SW. UP
SW. DOWN
NEUTRAL
WIPER
+B
F. LIMIT
GND
R. LIMIT
E
LIMIT SWITCH
117-6306 (NOTE D)
168-RD-14
168-RD-14
168-RD-18
168-RD-14
607-PK-18
322-GY-18
616-BU
495-GN-18
200-BK-18
L17
111-RD-14
189-RD-14
112-PU-14
177-RD-14
112-PU-14
AUX CKT SW PANEL
180-GN
H
(C) FUSES
10A 9W - 1442
15A 9W - 1441
20A 9W - 1446
30A 8T - 9636
L17
(9) ATCH 12V
VOLTAGE CONVERTER (5A)
119-1733
24V IN
GND
GND
12V OUT
251
X
200-BK
120-YL
200-BK
121-0987
L20
135-BU
1
2
120-YL
200-BK
L36
L19
L3
L25
L4
(A) ATCH 12V
SOCKET (5A)
CONN 10
(5) ATCH ANTENNA CABLE
111-4846
L35
10A
10A
20A
10A
10A
10A
10A
15A
24V MEMORY
120-YL
X
A
H
12V MEMORY
463
175-RD-14
185-YL-18
150-RD-18
150-RD-18
172-RD-18
K905-RD-14
G
176-YL
196-BU
L40
L17
Y/W
Y/G
C537-GN-18
C538-OR-18
L35
AUX CKT
FAN
BACKUP
INSP LAMP
HYD LOCK SW
HYD LOCK SOL
ENG GOV
E/P CONT
196-BU
K905-RD-14
185-YL18
150-RD-18
175-RD-14
172-RD-18
150-RD-18
150-RD-18
200-BK-18
320-OR-18
154-RD-18
151-GN-18
G
R
BR
R/L
4
1
3
5
519-PK-18
615-YL-18
124-GN-14
175-RD-14
L34
L25
(C) A/C PANEL SWITCH
119-6828 (NOTE L)
139-7207 (NOTE K)
(C) ATCH HEATER
PANEL SWITCH
119-6826 (NOTE L)
139-7261 (NOTE K)
(21) A/C UNIT
154-0523 (NOTE L)
130-0250 (NOTE K)
(46) ATCH HEATER UNIT
151-9680 (NOTE L)
139-7258 (NOTE K)
B
B
6
2
A
200-BK-14
200-BK-14
615-YL-18
615-YL
530-OR-18
191-WH
A586-OR-18
501-GN-18
590-GY-18
A589-OR-18
A590-BU-18
CONN 15
L33
BACKUP
EPR VALVE SW
K909-BU-18
K909-BU-18
185-YL-18
K907-BU-18
A770-PK-18
L969-WH-18
512-GN-18
511-BR-18
509-WH-18
E
E
615-YL
A584-BU-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
496-WH-18
200-BK-18
200-BK-18
200-BK-18
491-PK-18
200-BK-18
487-OR-18
168-RD-18
CONN 13
200-BK-18
L968-OR-18
2
118-GY
506-PU-18
A584-BU-18
ATCH SPEAKER(R)
7Y-5505
ATCH SPEAKER(L)
7Y-5505
E
DOME LAMP
096-0721
L33
L33
L4
L25
L3
L19
L20
L35
CONN 12CONN 11
L27
A587-YL-18
A590-BU-18
A591-PU-18 A583-YL-18
200-BK-18
A
2
1835476
6
E
615-YL
200-BK-14
191-WH-14
A584-BU-18
200-BK
200-BK-14
L29 L28
496-WH-18
491-PK-18
487-OR-18
54321
103-RD-18
508-PU-18
200-BK-18
CAB
200-BK-18
A A A
E D D
A589-OR-18
E
E
A591-PU-18
200-BK-18
114-0421
K909-BU-18
BACKUP
GOV SW
110-7884
CONN 14
L26
7654381
530-OR-18
200-BK-14
501-GN-18
A583-YL-18
K997-BU-18
A586-OR-18
L7
(23) FUEL LEVEL SENSOR
105-9911
B
1
2
B
B
GROUND
SIGNAL
C
+B
A
L39
L40
L37
L38
615-YL
615-YL-18
A A
6
81745
G G
308-YL-18
F772-WH-18
L969-WH-18
L968-OR-18
F771-OR-18
F772-WH-18
F774-WH-18
F773-OR-18
F771-OR-18
L33
185-YL-18
185-YL-18
K906-GN-18
A768-BU-18
A769-GY-18
GG
F772-WH-18
F774-WH-18
F773-OR-18
F771-OR-18
G G
345
618
7
2
615-YL-18
590-GY-18
403-GN-18
129-BU-18
103-RD-18
K911-PK-18
K912-GN-18
L6
L6
YL
BK
(E) HYDRAULIC OIL
LEVEL SWITCH
111-4760
(E) HYDRAULIC OIL
TEMPERATURE SENDER
T
4I-5394
B B
(E) HYDRAULIC OIL
FILTER SWITCH
116-3660
(C) FUSES
10A
10A
10A
10A
30A
10A
10A
10A
H
H
177-RD-10
L34
L36
CONN 16
2
3
K915-GN-18
K907-BU-18
-18
L969-WH-18
L968-OR-18
K909-BU
K907-BU-18
A770-PK-18
L27
L35
C538-OR-18
C537-GN-18
L26
168-RD-14
607-PK-18
322-GY-18
616-BU
200-BK-18
495-GN-18
1
2
B
FUSE BASE
111-4812
114-RD-18
103-RD-18
107-RD
105-RD-14
168-RD-10
147-PU
147-PU-18
149-PU
140-BU
175-RD-14
200-BK-18
320-OR-18
1241026
8
3
2
A755-PK-18
A756-BU-18
A757-GY-18
A758-BR-18
185-YL-18
A769-GY-18
A768-BU-18
K906-GN-18
L33
A587-YL-18
615-YL
508-PU-18
509-WH-18
511-BR-18
512-GN-18
103-RD-18
191-WH-14
200-BK-14
A590-BU-18
A589-OR-18
A583-YL-18
A584-BU-18
A584-BU-18
A583-YL-18
403-GN-18
506-PU-18
615-YL-18
129-BU-18
118-GY
103-RD-18
200-BK-14
K997-BU-18
501-GN-18
590-GY-18
A586-OR-18
K912-GN-18
K911-PK-18
530-OR-18
495-GN-18
200-BK-18
HORN
DOME LAMP
SHUTDOWN
KEY SW
REFUELING PUMP
FINE SWING SOL
FLOW CONT SOL
BOOM LAMP
LUBRICATOR
177-RD-14
L39
189-RD-14
112-PU-14
111-RD-14
177-RD-14
154-RD-18
172-RD-18
3
5
L34
4
124-GN-1
200-BK-14
200-BK-14
615-YL-18
519-PK-18
175-RD-14
CONN 17
2
7
81654
1
G
501-GN-18
590-GY-18
L972-BU-18
A589-OR-18
A590-BU-18
191-WH
615-YL-18
191-WH
191-WH-18
615-YL-18
615-YL-18
G
NOTE J
L5
151-GN-18
112-PU-14
177-RD-14
H
2
1
A
H
A
150-RD-18
185-YL-18
435
2
112-PU-14
177-RD-14
7
9111
CONN 23 CONN 24 CONN 25 CONN 26CONN 22CONN 21
113-OR-18
185-YL-18
116-BR-14
177-RD-14
1
3
191-WH
615-YL-18
113-OR-18
147-PU
L973-GN-18
K915-GN-18
118-GY
129-BU-18
105-RD-14
L20
L21
L21
4 5 6
147-PU
105-RD-14
A590-BU-18
A589-OR-18
L32
615-YL-18
615-YL-18
200-BK-14
200-BK-14
103-RD-18
103-RD-18
103-RD-18
103-RD-18
103-RD-18
103-RD-18
129-BU-18
118-GY
512-GN-18
511-BR-18
509-WH-18
508-PU-18
191-WH-14
191-WH-14
191-WH-14
191-WH
191-WH
A586-OR-18
501-GN-18
590-GY-18
A590-BU-18
A589-OR-18
615-YL
615-YL-18
530-OR-18
A587-YL-18
506-PU-18
403-GN-18
403-GN-18
403-GN-18
403-GN-18
403-GN-18
K911-PK-18
K912-GN-18
K997-BU-18
(41) ATCH REFUELING
124-GN-14
175-RD-14
L19
AA
3
4
G
530-OR-18
A586-OR-18
586-BR-18
310-PU-18
L32 L31 L10 L9 L8
310-PU-18
200-BK-18
(C) FUSES
112-PU-14
112-PU-14
116-BR-14
6
147-PU
152-BU
200-BK-18
7
12
152-BU
185-YL-18
152-BU
575-YL-18
578-BU-18
L32
147-PU
147-PU-18
586-BR-18
NOTE J
113-OR-18
113-OR-18
10A
124-GN-14
15A
129-BU-18
10A
118-GY
10A
152-BU
10A
120-YL
10A
115-PK-14
15A
191-WH-14
15A
H H
168-RD-10
168-RD-14
168-RD-14
114-RD-18
L37L38
196-BU
140-BU
107-RD
K905-RD-14
112-PU-14
H
1
A
191-WH-14
576-PK-18
200-BK-18
SWITCH
5C-6108
103-RD-18
114-RD-18
87654
3
140-BU
149-PU
177-RD-14
177-RD-14
111-RD-14
103-RD-18
K905-RD-14
L22
L18
A
9
10
11
G
326-RD
586-BR-18
307-OR-18
308-YL-18
791-PK-18
786-GN-18
326-RD
307-OR-18
105-RD-14
A758-BR-18
A757-GY-18
A756-BU-18
A755-PK-18
L12 L13
L11
200-BK-18
(B) ATCH FINE
SWING CONTROL SWITCH
200-BK-14
200-BK-14
103-RD-18
A587-YL-18
506-PU-18
403-GN-18
L20
L25
L2
AE
325-PK-18
(44) ATCH REFUELING
STOP SWITCH (NC)
RADIO
A/C /HEATER
CIGAR LIGHTER
WASHER/WIPER
LOWER WASHER/WIPER
CONVERTER
CAB/CHASSIS LAMP
PWR WINDOW
147-PU
149-PU
107-RD
147-PU-18
103-RD-18
105-RD-14
149-PU
168-RD-14
115-PK-14
105-RD-14
191-WH-14
H
6
2
1
11
12
A
L36
151-GN-18
168-RD-14
114-RD-18
115-PK-14
150-RD-18
154-RD-18
L18
9
827654321
69-GY-18
578-BU-18
A768-BU-18
A770-PK-18
A7
K906-GN-18
L973-GN-18
786-GN-18
791-PK-18
113-OR-18
308-YL-18
530-OR-18
308-YL-18
111-4788
L2
B
CONN 27
2
1
AE
CONN 28
9X-4184
140-BU
113-OR-18
124-GN-14
129-BU-18
113-OR-18
118-GY
152-BU
113-OR-18
124-GN-14
129-BU-18
2
7
894
120-YL
200-BK
107-RD
196-BU
189-RD
320-OR-18
172-RD-18
CONN 20CONN 19CONN 18
A
10 811
12
1
G
576-PK-18
575-YL-18
F773-OR-18
F774-WH-18
590-GY-18
200-BK-18
501-GN-18
L972-BU-18
A586-OR-18
L31
L31
200-BK-18
615-YL-18
615-YL-18
L973-GN-18
K915-GN-18
TT (NOTE H)
200-BK-18
L4
L25
L3
L20
L19
R
2
U
325-PK-18
U U
120-YL
118-GY
152-BU
191-WH-14
115-PK-14
120-YL
147-PU
113-OR-18
113-OR-18
147-PU-18
H
5
1
3
10
1
A
120-YL
113-OR-18
200-BK
112-PU-14
112-PU-14
112-PU-14
112-PU-14
112-PU-14
112-PU-14
(43) ATCH SEAT
WITH SEAT HEATER
111-6458
432
G
310-PU-18
200-BK-18
K909-BU-18
200-BK-18
200-BK-18
615-YL-18
615-YL-18
G
(B) ATCH SEAT
HEATER SWITCH
111-4783
325-PK-18
325-PK-18
365-YL-18
NN
(NOTE F)
1
365-YL-18
(42) ATCH REFUELING
START SWITCH (NO)
L24
103-RD-18
509-WH-18
508-PU-18
7
4
2
615-YL-18
103-RD-18
200-BK-18
2
1
200-BK-18
A537-PK-18
147-PU-18
200-BK-18
A537-PK-18
L3
168-RD-18
R
1
2
T
168-RD-18
L976-GN-18
6T-9442
200-BK-18
512-GN-18
615-YL-18
511-BR-18
P
5
8
6
3
A
512-GN-18
511-BR-18
508-PU-18
509-WH-18
200-BK-18
L4
L6
L7
NN
(NOTE F)
CONN 29
TT
(19) ATCH REFUELING
L16
L15
L17
PP
512-GN-18
511-BR-18
509-WH-18
L24
508-PU-18
200-BK-18
103-RD-18
113-OR-18
615-YL-18
(8) ATCH
CONVERTER
134-1346
GND
IGN
12V
MEM
24V
W
592-BU-18
A513-RD-18
200-BK-18
113-OR-18
103-RD-18
6
42513
ATCH RADIO CONVERTER FOR OUTSIDE JAPAN
V
L20
L21
L19
L3
L18
L13
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
L10
615-YL-18
615-YL-18
A590-BU-18
A589-OR-18
G
(A) POWER
WINDOW LIMIT SWITCH
111-4789
616-BU
322-GY-18
L5
607-PK-18
168-RD-14
325-PK-18
N
NN (NOTE F)
18
325-PK-
168-RD-18
168-RD-18
365-YL-18
L976-GN-18
168-RD-18
L976-GN-18
111-4871
B
L976-GN-18
N
NN (NOTE F)
CONN 30
START RELAY
P
SPEAKER (-)
SPEAKER (+)
SPEAKER (-)
SPEAKER (+)
GND
BACK UP
ACC (+)
ILLUMI (+)
ATCH RADIO FOR JAPAN
TO RADIO
8674251
3
512-GN-18
509-WH-18
511-BR-18
508-PU-18
A513-RD-18
592-BU-18
200-BK-18
W
V
511-BR-18
113-OR-18
103-RD-18
508-PU-18
200-BK-18
509-WH-18
512-GN-18
8
7
345
6
1
2
L9
191-WH-18
200-BK-18
200-BK-18
CBA
365-YL-18
NN (NOTE F)
578-BU-18
615-YL-18
615-YL-18
(B) ATCH LOWER
WASHER SWITCH
111-4786
365-YL-18
200-BK-18
N
(20) ATCH REFUELING
STOP RELAY
111-4871
(5) ATCH ANTENNA CABLE
111-4846
(C) ATCH 12VDC
AM/FM RADIO
153-2444
(C) ATCH 12VDC
AM RADIO
136-4006
V
L8
152-BU
200-BK-14
200-BK-18
365-YL-18
ANTENNA
A755-PK-18
A756-BU-18
L11
A757-GY-18
A758-BR-18
200-BK-18
152-BU-18
200-BK-18
200-BK-14
200-BK-18
L976-GN-18
L976-GN-18
329-YL-18
AH
AF
ANTENNA
ATCH RADIO WITH CASSETTE DECK FOR JAPAN
200-BK-18
L972-BU-18
A586-OR-18
L13
308-YL-18
308-YL-18
L12
326-RD
307-OR-18
105-RD-14
200-BK-18
L8
615-YL-18
575-YL-18
152-BU-18
(B) ATCH LOWER
WIPER SWITCH
111-4785
308-YL-18
A758-BR-18
A757-GY-18
A756-BU-18
L972-BU-18
L4
B
CHASSIS
NN (NOTE F)
323-WH-14
(18) ATCH REFUELING
ATCH
AM/FM RADIO
(CASSETTE)
153-2503
AUX-SPEAKER(+)
GND
AUX-SPEAKER(-)
SPEAKER (-)
SPEAKER (+)
84152
508-PU-18
512-GN-18
C560-OR-18
C566-PK-18
200-BK-18
615-YL-18
113-OR-18
103-RD-18
AF
1
590-GY-18
501-GN-18
530-OR-18
786-GN-18
791-PK-18
113-OR-18
200-BK-18
G
2
3
4
5
1
6
POSITION SWITCH
200-BK-18
200-BK-18
576-PK-18
GGGG
K915-GN-18
F771-OR-18
F772-WH-18
K907-BU-18
A755-PK-18
616-BU
322-GY-18
200-BK
200-BK-18
CONN 36
200-BK-14
(18) DIODE
121-1022
329-YL-18
N
POWER RELAY
3T-0376
L22
SPEAKER (+)
SPEAKER (-)
ACC
ILLUMI
BACKUP
6
7
1093
615-YL-18
509-WH-18
511-BR-18
103-RD-18
113-OR-18
508-PU-18
200-BK-18
511-BR-18
509-WH-18
512-GN-18
63542
7
8
A
PLATFORM
L22
G
(B) SWITCH PANEL
G
G
R
C
OFF
ON
S
ST
B
S1
S2
S3
S4
COM
(B) THROTTLE
106-0107
L969-WH-18
L968-OR-18
K905-RD-18
K905-RD-14
(B) ONE TOUCH
LOW IDLE SWITCH
128-2134
153-2500
W. INT (3)
W. INT (6)
W. LOW
WASH
L. BOOM
L. CHASSIS
+B
GND
(B) KEY SWITCH
9G-7641
200-BK-18
200-BK-18
200-BK-18
235-BK-18
L908-OR-18
L909-BU-18
A771-PU-18
K905-RD-18
ABC
L974-GN-18
L978-GY-18
ALL DASHED LINES ARE ATTACHMENTS.
B2RR
4
1
3
168-RD-18
616-BU
200-BK
322-GY-18
200-BK-18
200-BK-14
323-WH-14
N
168-RD-14
123-3929
1
2
+
-
NN (NOTE F)
168-RD-18
168-RD-18
168-RD-18
(17) ATCH REFUELING PUMP
OPERATOR STATION
112-PU-14
112-PU-14
112-PU-14
112-PU-14
112-PU-14
112-PU-14
615-YL-18
615-YL-18
177-RD-14
116-BR-14
107-RD
196-BU
172-RD-18
189-RD
320-OR-18
154-RD-18
151-GN-18
150-RD-18
114-RD-18
168-RD-14
115-PK-14
149-PU
140-BU
177-RD-14
177-RD-14
111-RD-14
519-PK-18
147-PU-18
147-PU-18
147-PU
147-PU
147-PU
152-BU
105-RD-14
185-YL-18
113-OR-18
K905-RD-14
508-PU-18
509-WH-18
511-BR-18
512-GN-18
103-RD-18
103-RD-18
191-WH-14
118-GY
129-BU-18
200-BK-18
200-BK-18
200-BK-14
200-BK-14
200-BK
200-BK
200-BK-14
200-BK-14
200-BK-18
200-BK-18
200-BK-14
200-BK-14
235-BK-14
200-BK-18
200-BK-18
788-YL-18
A762-PU-18
L977-YL-18
789
65432
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS OFF.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS ON.
L1
763-BU-18
412-BU-18
C468-BU-18
10111
112-PU-6
615-YL
615-YL
L21
L20
K997-BU-18
L978L974-GN-18
L977-YL-18
L1
L970-GY-18
L971-GN-18
L969-WH-18
L975-PK-18
L972-BU-18
492-GY-18
405-GY-18
321-BR-18
A
12
A
L3
L20
L21
A771-PU-18
GY-18
788-YL-18
A762-PU-18
763-BU-18
412-BU-18
C468-BU-18
321-BR-18
405-GY-18
492-GY-18
491-PK-18
495-GN-18
430-BU-18
496-WH-18
K904-GN-18
A761-PU-18
403-GN-18
L968-OR-18
K907-BU-18
F772-WH-18
F771-OR-18
487-OR-18
306-GN-18
954-GN-18
K915-GN-18
K905-RD-18
K905-RD-18
235-BK-18
235-BK-18
K911-PK-18
K912-GN-18
A755-PK-18
A756-BU-18
A757-GY-18
A758-BR-18
308-YL-18
L908-OR-18
L909-BU-18
235-BK-18
496-WH-18
430-BU-18
495-GN-18
491-PK-18
2345618
L19
L3
L18
A
16
19
11
39
32
33
17
5
37
14
1
28
23
38
7
12
8
21
24
25
22
15
36
31
26
13
30
29
35
40
2
9
6
18
34
3
4
27
20
10
39
4
21
37
22
11
1
2
12
15
16
13
14
23
24
3
34
31
32
33
35
36
6
7
8
9
10
17
18
19
20
25
26
27
28
5
29
30
38
40
A
487-OR-18
A761-PU-18
K904-GN-18
A
7
A
STARTING CIRCUIT.
GAUGE CIRCUIT.
MONITOR CIRCUIT.
WIPER/WASHER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
AIR INLET HEATER CIRCUIT.
ENGINE PUMP CONTROL CIRCUIT.
OPERATOR STATION
J
RR
1
2
RR
(10) HORN
7Y-3919
(10) HORN
7Y-3920
RR
(13) CHASSIS LAMP
51-8251
200-BK-18
607-PK-18
322-GY-18
200-BK-18
322-GY-18
322-GY-18
200-BK-18
200-BK-18
B
L16
K997-BU-18
K997-BU-18
K997-BU-18
K997-BU-18
L2
L15
L15
L14
403-GN-18
K911-PK-18
K912-GN-18
A588-GN-18
L14
147-PU-18
950-BR-18
200-BK-18
200-BK-18
(A) A/C PHOTO SENSOR
C538-OR-18
C537-GN-18
K911-PK-18
K997-BU-18
103-RD-18
K912-GN-18
615-YL-18
201-BK-18
403-GN-18
(A) SERVICE METER
L6
129-BU-18
200-BK-18
A584-BU-18
590-GY-18
A586-OR-18
A583-YL-18
501-GN-18
506-PU-18
118-GY
530-OR-18
200-BK-14
L7
L17
954-GN-18
576-PK-18
152-BU-18
575-YL-18
200-BK-18
(G) ATCH LOWER
200-BK-18
200-BK-18
200-BK-18
PLATFORM
128-2162 (NOTE G)
A582-PU
A580-BR
A581-GN
200-BK
(A) WINDOW
LIMIT SWITCH
124-3974 (NOTE E)
200-BK-18
200-BK
200-BK
200-BK-14
ABBREV COLOR
RD
WH
OR
YL
PK
BK
GY
PU
BR
GNBUGREEN
G975-YL-18
G973-OR-18
112-PU-6
615-YL
177-RD-14
116-BR-14
107-RD
196-BU
172-RD-18
189-RD
320-OR-18
154-RD-18
151-GN-18
150-RD-18
114-RD-18
168-RD-14
115-PK-14
149-PU
140-BU
177-RD-14
177-RD-14
111-RD-14
519-PK-18
147-PU-18
200-BK-14
200-BK-14
L19
103-RD-18
A587-YL-18
506-PU-18
403-GN-18
954-GN-18
A771-PU-18
L978-GY-18
L974-GN-18
L977-YL-18
L908-OR-18
L909-BU-18
235-BK-18
788-YL-18
A762-PU-18
763-BU-18
412-BU-18
C468-BU-18
321-BR-18
L3
405-GY-18
492-GY-18
491-PK-18
495-GN-18
430-BU-18
496-WH-18
K904-GN-18
A761-
PU-18
487-OR-18
306-GN-18
L975-PK-18
L971-GN-18
K997-BU-18
235-BK-14
200-BK-18
586-BR-18
786-GN-18
791-PK-18
308-YL-18
326-RD
307-OR-18
578-BU-18
L973-GN-18
K906-GN-18
L18
A768-BU-18
A769-GY-18
A770-PK-18
F774-WH-18
F773-OR-18
K909-BU-18
310-PU-18
A588-GN-18
A588-GN-18
575-YL-18
152-BU-18
576-PK-18
954-GN-18
(7) ENGINE / PUMP CONTROL
119-0607 (NOTE L)
126-2978 (NOTE K)
SW INPUT
TI N R (PWM)
OP O SE S
N O )
OPTION SENSOR (PWM
JOYSTICK +B OUT
UAL PWR SOL
D
MONITOR +B OUT
IMPLEMENT PRESS SW
TRENCHING SOL
BOOM RAISE PRESS SW
LEVEL FINISH SOL
ENG SPEED SENSOR (+)
ENG SPEED SENSOR (-)
TRAVEL SPEED SOL
COOLANT LEVEL SW
ENG OIL LEVEL SW
TRAVEL ALARM
ENG OIL PRESS SW
COOLANT SENSOR
HYD OIL TEMP SENSOR
FUEL LEVEL SENSOR
AIR CLEANER SENSOR
HYD OIL LEVEL S
FRONT PUMP PRESS SENSOR
GOV ACTR FDBK
AUX HYD PRESS SW
TRAVEL PRESS SW
ALTERNATOR (P TERM)
EPR VALVE (+)
EPR VALVE (-)
SWING BRAKE SOL
GOV ACTR (B)
GOV ACTR (A)
HYD OIL FILTER INDICATOR
KEY SW START
AIH INDICATOR
HAMMER PRESS. SW
FINE SWING SW
+B
+B
GND
GND
RS485 + (MONITOR)
RS485 - (MONITOR)
THROTTLE DIAL S1
THROTTLE DIAL S2
THROTTLE DIAL S3
THROTTLE DIAL S4
KEY SW ON
LOW IDLE SW
RS232C (T
RS232C (RXD)
RS232C (GND)
HYD TANK INDICATOR
HYD TANK PRESS. SW
RS485 - (RH JOYSTICK)
RS485 + (LH JOYSTICK)
RS485 - (LH JOYSTICK)
RS485 + (PEDAL)
RS485 - (PEDAL)
RS485 + (RADIO CONT)
RS485 - (RADIO CONT)
RS485 + (ELEC GOV)
RS485 - (ELEC GOV)
RS485 + (VALVE CONT)
RS485 - (VALVE CONT)
RS485 + (SEMI AUTO)
RS485 - (SEMI AUTO)
RS485 + (RH JOYSTICK)
235-BK-18
235-BK-18
235-BK-14
XD)
306-GN-18
954-GN-18
K997-BU-18
L971-GN-18
L975-PK-18
16253
W
L970-GY-18
A
4
A
CONN 35CONN 34CONN 33CONN 32
L
#
IDENT PART NO. LOC
HARNESS AS.
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
U
V
W
X
Y
Z
LL
NN
RR
AB
AC
AD
AE
AF
L2
L6
616-BU
616-BU
200-BK
200-BK
616-BU
200-BK
THIS SCHEMATIC IS FOR THE 320B AND 320B L HYDRAULIC EXCAVATOR
ELECTRICAL SYSTEM
PART NUMBER: 116-0201, CHANGE: 09, VERSION: HE
Components are shown installed on a fully operable machine with the key and engine off.
ATCH
BOOM LAMP
5I-8250
J
F (NOTE B)
K
ATCH
BOOM LAMP
5I-8250
F (NOTE B)
K
UNLESS OTHERWISE SPECIFIED ALL WIRE IS 16 GAUGE.
NOTE A: NORMALLY OPEN BEFORE REFRIGERANT CHARGE.
NOTE B: USE WITH SHORT BOOM.
NOTE C: USE WITH COLD WEATHER.
NOTE D: USE WITH ELECTRIC OPENABLE WINDSHIELD.
NOTE E: NOT NECESSARY FOR ELECTRIC OPENABLE WINDSHIELD.
NOTE F: USE WITH ADD TANK.
NOTE G: USE WITH A/C UNIT.
NOTE H: NOT NECESSARY FOR FINE SWING CONT.SW.
NOTE J: NOT USED ON THIS MACHINE.
NOTE K: USE FOR OUTSIDE JAPAN.
NOTE L: USE FOR JAPAN.
NOTE M: NOT NECESSARY FOR FLOW CONTROL.
NOTE N: NOT USE WITH COLD WEATHER FOR JAPAN.
NOTE P: USE WITH COLD WEATHER FOR JAPAN.
AJ
WIRE AS.
SS
L7
TT
UU
VV
WW
XX
YY
ZZ
AG
AK
AL
AM
CABLE AS.
AA
BB
CC
EE
FF
GG
JJ
KK
PP
AH
H
154-RD-18
151-GN-18
150-RD-18
320-OR-18
200-BK-18
H
1
A
3
1
4
2
A
WIPER MOTOR
113-3452
950-BR-18
200-BK-18
(G) ATCH FLOW
CONTROL
PRESSURE SWITCH
G975-YL-18
G973-OR-18
(G) ATCH CRUSH
PRESSURE SWITCH 1
106-0181 (NOTE M)
L970-GY-18
200-BK-18
(G) ATCH AUX
HYDRAULIC
PRESSURE SWITCH
954-GN-18
200-BK-18
(G) ATCH HAMMER
PRESSURE SWITCH
G975-YL-18
G973-OR-18
(G) ATCH CRUSH
PRESSURE SWITCH 2
Y
106-0181 (NOTE M)
A
615-YL-18
200-BK-18
615-YL-18
200-BK-18
ATCH POWER
WINDOW LIMIT SW
117-6306 (NOTE D)
615-YL-18
200-BK-18
200-BK-18
200-BK-18
A584-BU-18
A584-BU-18
200-BK-18
200-BK-18
200-BK-18
D
(A) MONITOR
D
+
6T-7337
D
3
9
4
11
8
5
6
7
10
12
13
2
1
D
(A) WIPER/WASHER
CONTROL
155-7042
A579-OR
D
D
D
D
RED
WHITE
ORANGE
YELLOW
PIN
K
BLACK
GRAY
PURPLE
BROWN
BLUE
DESCRIPTIONSYMBOL
BLADE, SPADE, RING,
OR SCREW TERMINAL
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ELECTRICAL CONNECTION
TO MACHINE STRUCTURE
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
CONNECTOR
ATCH WIRE, CABLE,
COMPONENT
CIRCUIT GROUPING
DESIGNATION
150-6998
138-5134
153-2496
153-2555
111-4795
4I-5396
150-6999
153-2491
116-022
7
140-0923
116-0243
128-8872
128-8970
111-4841
128-8877
116-0096
116-0098
150-7026
150-7022
116-0258
121-1033
121-1034
128-8879
128-8971
125-4873
132-1865
132-1866
132-1867
132-1827
153-2499
163-6681
128-8936
116-0237
111-4826
111-4831
111-4830
111-4829
128-8937
128-8938
153-2492
163-6691
163-6692
163-6693
116-0228
116-0080
125-4727
128-8871
116-0080
116-0242
116-0233
116-0234
111-4846
153-2504
A
B
C
(C) NEUTRAL START
LIMIT SWITCH
111-4799
(C) HORN SWITCH
128-2134
(G) HYDRAULIC
LOCK SOLENOID
2
121-1491
+
S
+1
MOTOR
-
Y
1
2
106-0181
AB
2
1
1
2
106-0181
A
1
2
106-0181
AB
2
1
L L
E
615-YL
200-BK
(12) ATCH CAB LAMP
111-4813
5I-8250
(12) ATCH CAB LAMP
5I-8250
E
615-YL
200-BK
E
615-YL
Y/G
Y/W
106-0172
RS485+
MAIN
+B
RS485LIGHT
GND
200-BK-18
D D
(A) CIGAR
LIGHTER
9W-0335
WIPER CUT
INT (3)
INT (6)
RISE. S
LOW
WA+
ACC
WASH
GND
S
TOP
REV
W. CW
W. CCW
MOTOR
(A) WIPER
MOTOR
122-9603
A584-BU-18
2
00-BK-18
200-BK-18
201-BK-18
CAB
C-2
A-3
F-8 (NOTE N)
D-1
G-1
A-1 (NOTE B)
D-3
H-4
B-2
A-1
G-1
E-7
A-2
I-3
A-4
A-4
A-4
H-3
H-3
H-6
H-1
F-8
D-7
A-2 (NOTE F)
A-2
H-1 (NOTE M)
D-7 (NOTE M)
E-8 (NOTE M)
A-4
H-3
F-8 (NOTE P)
I-8
D-4 (NOTE H)
F-8 (NOTE N)
F-8
F-8
F-8
I-8 (NOTE N)
F-8 (NOTE N)
I-9 (NOTE K)
U-8 (NOTE P)
I-8 (NOTE P)
F-8 (NOTE P)
A-8
I-8
I-8
A-8 (NOTE C)
H-8 (NOTE C)
I-8 (NOTE C)
F-8
F-8
I-3
H-3
I
H
G
LL
E
L7
F
E
L7
D
C
B
A
E94290
Page 12
MACHINE HARNESS CONNECTOR AND
VIEW ALL CALLOUTS
COMPONENT LOCATIONS
24
22
21
38
4
26
14
36
1
40
3
16
F
29
E
32
34
2
23
31
47
45
39
6
8
35
49
D
41
15
5
46
7
44
B
A
10
12
17
18
13
19
43
28
20
42
G
9
16
3
40
36
26
21
22
4
38
2
1
14
31
34
35
D
6
5
9
8
46
49
A
7
43
CCB
G
12
10
24
F
45
29
39
E
15
32
23
28
41
47
44
42
17
20
18
19
13
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