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.
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
3
4
5
6
8
9
10
12
14
15
13
16
B
C
D
E
1
2
17
18
21
22
23
24
27
29
30
31
35
34
36
38
7
F
39
A
3
4
5
6
8
9
10
12
14
15
13
16
B
C
D
E
1
2
17
21
22
23
24
27
28
29
30
31
35
34
36
38
7
F
39
28
28
28
Machine Harness Connector And Component Locations
Connector Location¹
Connector Number Schematic Location Machine Location
CONN 1 E-12 D
CONN 2 E-12 D
CONN 3 F-12 D
CONN 4 F-9 D
CONN 5 F-9 D
CONN 6 E-9 D
CONN 7 D-9 D
CONN 8 B-8 E
CONN 9 B-9 E
CONN 10 C-8 E
CONN 11 C-7 E
CONN 12 D-6 4
CONN 13 C-5 A
CONN 14 C-5 D
CONN 15 E-5 C
CONN 16 E-5 C
CONN 17 B-3 B
CONN 18 C-3 B
CONN 19 D-4 6
CONN 20 D-3 6
CONN 21 D-3 6
CONN 22 D-3 6
CONN 23 E-3 C
CONN 24 F-3 C
CONN 25 E-2 C
CONN 26 B-3 27
CONN 27 A-2 F
CONN 28 A-2 C
CONN 29 E-10 B
CONN 30 D-4 B
¹The connectors shown in this chart are harness to harness and
special use connectors. Connectors which join a harness to a
component are generally located at on near the component. See
the component location chart.
Real Time Error Codes
Code Description of Problems
E00 No Problem.
E01 Engine oil pressure is too low.
E02 Engine coolant temperature is too high.
E03 Hydraulic oil temperature is too high.
E04 Battery voltage is not normal.
E05 Alternator terminal circuit is open.
E06 Engine speed sensor circuit is open or sensor is not installed correctly
E07 Engine speed is not normal.
E09 Governor actuator feedback sensor voltage is too low.
E10 Governor actuator feedback sensor circuit is open or shorted to battery voltage.
E11 Governor actuator feedback sensor circuit is shorted to body ground.
E12 Governor actuator feedback sensor voltage is not stable.
E13 Governor actuator motor (+) circuit is shorted to body ground.
E14 Governor actuator motor does not rotate or motor circuit is shorted to battery voltage.
E15 Governor actuator motor (+) circuit is open.
E16 Proportional reducing valve (+) circuit is shorted to body ground.
E17 Proportional reducing valve (+) circuit is shorted to battery voltage.
E18 Proportional reducing valve circuit is open.
E25 Engine coolant temperature sensor circuit is shorted to ground.
E26 Engine coolant temperature sensor circuit is open or shorted to battery voltage.
E27 Hydraulic oil temperature sensor circuit is shorted to body ground.
E28 Hydraulic oil temperature sensor circuit is open or shorted to battery voltage.
E31 Engine speed dial signal is not one of the specified ten (10).
E32 There is more than 100 rpm difference between engine speed dial setting and actual speed.
E33 Solenoid output circuit is shorted to +battery or ground.
E34 Governor actuator remains deactivated an elapsed time of 2.5 seconds after engine speed dial setting.
E36 Monitor takes at least one second to respond to controller's signal.
E37 Monitor RAM is not normal.
E38 Controller is informed of it's error signal by monitor.
E39 Controller detects its error signal by itself.
E40 Error in controller memory.
E41 A controller for a different machine is installed or there is a harness code problem.
E48 Engine stalls.
Off Machine Switch Specification
Part No. Function Actuate Deactuate Contact Position
101-3082 Pressure 3500 kPa 3000 ± 150 kPa 1-2 Normally Open
(508.0 psi) (435.1 ± 22.0 psi) 1-3 Normally Closed
119-9985 Pressure 1225 ± 98 kPa 882 kPa MIN Normally
(178 ± 14.2 psi) (128.0 psi MIN) Open
102-8042 Boom Raise Pressure 2450 ± 441 kPa 1470 kPa MIN Normally
(355 ± 64 psi) (213 psi MIN) Open
102-8041 Implement Pressure 1225 ± 343 kPa 735 kPa MIN Normally
Travel Pressure (178 ± 50 psi) (107 psi MIN) Open
3T-4418 Engine Oil Pressure 93 ± 21 kPa 69 ± 21 kPa Normally
(13.5.0 ± 3.0 psi) (10.0 ± 3.0 psi) Open
Resistor, Sender, and Solenoid Specifications
Part No. Component Resistance (Ohms)¹
3T-9493 Start Aid Solenoid 1.5
6T-5859 Combination / Single (ATCH) Solenoid 33.7 ± 1.0%
102-8015 Backup Resistor 41 ± 0.6%
112-4009 Engine Coolant Temp Sender 1100
¹ At room temperature.
Wire Description
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
Power Distribution Circuits Accessory Circuits
101 RD Bat (+) 500 BR Wiper - Front (Park)
102 BU Hd Lmp 501 GN Wiper - Front (Low)
103 YL Aux Ckt 506 PU Washer - Front
105 BR Key Sw 513 OR A/C Compressor/Refrigerant Pressure Switch
109 OR Alt Output (+) Term. 519 PK Thermostat To Refrigerant Press. SW
112 PU Main Power Rly Output 575 YL Wiper - Aux (Park)
113 OR Opr Mon Panel 576 PK Wiper - Aux (Low)
114 GN Warning Horn (Forward) 578 BU Wiper - Aux
115 PK Aux Ckt 586 BR Aux Hyd - Close
118 GY Aux Ckt
Lighting Circuits
120 YL Aux Ckt 607 PK Flood Lamp - Front
121 YL Back Alarm To Lamp 615 YL Cab Flood Lamps / Rops
122 BU Aux Ckt 616 BU Bucket Flood Lamp / Boom Flood Lamp
124 GN A/C
Control Circuits
129 BU Aux Ckt 763 BU Torque Converter SW.
135 BU Aux Ckt 786 GN Eng Speed Cont. - Hi Press SW
142 BU Aux Ckt 788 YL Eng. Speed (+)
149 PU Aux Ckt 791 PK Eng. Speed Cont. - Lo Sol
151 GN Aux Ckt 792 OR Undisrupted Proportional Sol.
152 BU Aux Ckt A755 PK Throttle SW #1
154 WH Aux Ckt A756 BU Throttle SW #2
168 GN Aux Ckt A757 GY Throttle SW #3
184 BU Aux Ckt A758 BR Throttle SW #4
185 YL Aux Ckt A761 PU Electronic Pump Cont. Throttle Ground
Ground Circuits
A762 PU Electronic Pump Cont. Eng. Speed Ground
200 BK Main Chassis A763 GY Electronic Pump Cont. Decel (-)
201 BK Operator Monitor Return A768 BU Pump Control Valve #1 (+)
210 BK Converter Output (24/12 Volt) A769 GY Pump Control Valve #2 (-)
235 BK Electronic Pump Ctrl. Gnd A770 PK Electronic Pump Control Bypass SW to Resistor
264 BK Electronic Pump Ctrl. Ident Code 3 A771 PU Float SW
265 BK Electronic Pump Ctrl. Ident Code 2 A877 PU Left Console Stop / Go SW to Park Brake
266 BK Electronic Pump Ctrl. Ident Code 1 B730 OR Electronic Pump Control Ps Valve (-)
267 BK Electronic Pump Ctrl. Ident Code 0 B731 WH Electronic Pump Control Ps Valve (+)
Basic Machine Circuits
B737 GN Electronic Pump Control to Pressure Switch
304 WH Starter Relay No. 1 Output B739 WH Electronic Pump Control Display Switch Hold Input
306 GN Starter Relay Coil To Neut Start SW Or Key SW B740 OR Electronic Pump Control Display Switch Clr Input
307 OR Key SW To Neutral Start SW. B751 BU Centershaft Lock Sol
308 YL Main Power Relay Coil B786 BU Low Idle SW
309 GY Alternator Regulator Term. B789 BR Governor Actuator (-) (Backup SW to Power Control)
311 WH Start Aid Sol To Temp SW B790 OR Governor Actuator (+) (Backup SW to Power Control)
320 OR Horn Relay Coil to SW D746 PK Alt Signal to Anti-Start Relay
321 BR Backup Alarm Lamp Travel Alarm D764 GN Electronic Pump Control Boom Pressure Switch
322 GY Warning Horn 877 YL Glow Plug Magnetic SW to Glow Plug
323 WH Fuel Pump Power A877 PU Left Console Stop / Go SW to Park Brake SW
325 PK Fuel Pump Relay Call Out 952 OR Hammer SWAB
327 PK Shutdown Solenoid A983 BU Throttle Cont - Signal
332 BU Shutdown SW to Shutdown Ctrl. B955 YL Excavator System Lock Limit Switch
334 BU Start Aid Sol. #2 B956 PK Excavator System Lock Sol.
365 YL Fuel Pump Relay to Switch B964 YL Trenching Sol.
Monitoring Circuits
B965 GY Level Finish Sol.
403 GN Alternator (R) Term.
405 GY Opr. Mon. Oil Press. (Low Setting)
410 WH Opr Mon Fault Alarm
439 YL Lamp Indicator
Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
Alarm - Action D-2 A Sensor - Fuel B-4 38
Alarm - Travel (ATCH) B-12 1 Solenoid B-12 9
Alternator B-10 3 Solenoid - Eng/Pump Cont. A-8 B
Battery D-12 5 Solenoid - Comb./Single (ATCH) A-5 F
Block AS D-9 D Solenoid - Start Aid A-12 24
Breaker D-9 D Solenoid - A/C Clutch (ATCH) B-10 34
Controller- Eng/Pump A-7 D Solenoid - Level Finish A-8 23
Converter - (ATCH) D-6 7 Solenoid - Travel Speed A-8 23
Fuse - Block F-7,8,9 D Solenoid - Trenching A-8 23
Heater - Air A-12 2 Multi-Switch - Joystick R.H C-3 C
Horn B-2 8 Multi-Switch - Joystick L.H F-3, F-2 B
Lamp - Boom (ATCH) B-2 31 Switch - Overload Warning Press B-5 F
Lamp - Cab (ATCH) E-1,F-1 13 Switch - Overload Warning (ATCH) C-4 C
Lamp - Chassis A-2 29 Switch - Combined (ATCH) A-2 C
Lamp - Dome C-6 A Switch - Windshield D-2 A
Lighter - Cigar D-2 A Switch - Coolant A-12 35
Meter - Service E-2 A Switch - Press (ATCH) B-9 F
Monitor E-2 A Switch - Press (ATCH) F-3 B
Motor - Lower Washer (ATCH) C-12 28 Switch - Accel. Backup C-4 C
Motor - Lower Wiper F-1 12 Switch - AS C-2 C
Motor - Starter A-10 14 Switch - Boom Raise C-8 E
Motor - Washer C-12 28 Switch - Disconnect D-9 D
Motor - Upper Wiper F-2 30 Switch - Engine Oil B-10 36
Pump - Refueling (ATCH) A-3 17 Switch - Governor Backup C-5 B
Relay - Boom Lamp E-8 D Switch - Implement B-8 E
Relay - Chassis/Cab Lamp A-2 D Switch - Neutral Start F-2 C
Relay - Start D-7 D Switch - PS Valve Backup F-4 C
Relay - Horn E-7 D Switch - Radio (ATCH) E-4 A
Relay - Main D-7 D Switch - Refrigerant B-12 9
Relay - Refueling E-7 D Switch - Throttle Pos. C-2 C
Relay - Start D-7 D Switch - Refueling (ATCH) A-4 38
Relay - Washer E-8 D Switch - Refueling Pump (ATCH) A-3 16
Relay - Wiper E-8, 9 D Switch - Key Start C-2 C
Resistor - Backup F-5 C Switch - Travel C-8 E
Sensor - Eng. Speed Pickup A-10 21 Unit - A/C (ATCH) E-6 39
Sender - Hydraulic Oil B-8 E Unit - Heater E-6 10
Sender - Engine Coolant C-10 22
A = Located inside cab.
B = Located inside of L.H. Console.
C = Located inside of R.H. Console.
D = Located in side compartment behind the cab.
E = Located around hyd. oil tank.
F= Located around pilot manifold.
Machine locations are repeated for components located close together.
Related Electrical Service Manuals
Title Form Number
Engine / Pump Control SENR6155
Starter Motor SENR3550
Alternator SENR3685
SENR6226-01
February 1999
315, 317 and 317 N Excavators
Electrical System
315:
3ZM1 - UP
317:
4MM1 - UP
317 N:
9SR1 - UP
©
1999 Caterpillar
All Rights Reserved
Printed in U.S.A.
ATCH
A/C CLUTCH SOL
101-1759
BK-14
BK/PK-14
L18 L17
L14
L15
200-BK
200-BK
L16
L12
L15
200-BK
B
BB
B BBB
AA
L18
B
A761-PU
PK
OR
B
365-YL
MOTOR
323-WH
578-BU
519-PK
BK-00
791-PK
792-OR
607-PK
321-BR
B A
RD-00
788-YL
322-GY
BK
A983-BU
121-YL
506-PU
B
B
B
101-RD-4
MOTBAT
G
S
EE
877-YL
B
B
B
EE
506-PU
578-BU
A768-BU
A768-BU
763-BU
A762-PU
410-WH
A758-BR
RELAY PANEL
10
RD-00
CHASSIS
A200
877B
878A-WH
334B-BU
B
AA
B
B
B
A757-GY
109-OR-6
334A
B
A756-BU
A755-PK
COOLANT SW
8N-1693
B786-BU
B956-PK
B955-YL
ALTERNATOR
109-2362
142-BU-14
START AID SOLENOID
3T-9493
616-BU
SEE NOTE B
E
403-GN
309-GY
D764-GN
L18
A771-PU
L20
T
L16
200-BK-6
B789-BR
B790-OR
321-BR
121-YL
B739-WH
B740-OR
B730-OR
200-BK
B737-GN
D746-PK
B731-WH
1
308-YL
405-GY
491-PK
184-BU
4
7
786-GN
332-BU
A769-GY
A768-BU
ATCH
TRAVEL
ALARM
3T-1444
B964-YL
B965-GY
D764-GN
B965-GY
B964-YL
B737-GN
A771-PU
A762-PU
788-YL
763-BU
495-GN
491-PK
309-GY
492-GY
492-GY
491-PK
405-GY
D746-PK
495-GN
763-BU
101-RD-4
L11
2
492-GY
142-BU-14
322-GY
788-YL
A762-PU
A771-PU
ENG
308-YL
615-YL
308-YL
B731-WH
B730-OR
B740-OR
B739-WH
B790-OR
B789-BR
B955-YL
B956-PK
B786-BU
A755-PK
A756-BU
A757-GY
365-YL
B737-GN
B964-YL
323-WH
8
513-OR
MOTOR
2
1
9
5
6
3
405-GY
W
2
1
2
B-
B+
P
D
ALT
1
403-GN
2
A769-GY
2
1
10
607-PK
A768-BU
ALTERNATOR
109-2362
A758-BR
410-WH
1
2
616-BU
B965-GY
200-BK
327-PK
3
4
519-PK
2
1
5
T
COOLANT TEMP
SENDER
112-4009
MOTOR
200-BK
6
513-OR
D764-GN
ATCH
REFRIGERANT SW (NOTE A)
101-8789
1
200-BK
WASHER
ATCH
LOWER WASHER
121-YL
519-PK
513-OR
321-BR
B A
6
304-WH-10
7
8
9
5
4
3
2
1
10
492-GY
200-BK
ENG OIL SW
3T-4418
A768-BU
200-BK
200-BK
109-OR-6
334-BU-14
500-BR
YL
501-GN
118-GY
120-YL
CCBB
POS
NEG
321-BR
200-BK
327-PK-16
BK-00
200-BK
403-GN
334-BU-14
327-PK-16
109-OR-6
BK-00
200-BK-6
NEG
POS
BATTERY
3T-5760
D746-PK
A762-PU
101-RD-4
788-YL
309-GY
405-GY
405-GY
B
B B
235-BK-14
506-PU
327-PK-16
AIR HEATER
035-8059
ENG.PUMP
FUEL
309-GY
101-RD-4
A769-GY
B
SOLENOID
403-GN
304-WH-10
200-BK
200-BK
309-GY
788-YL
BK-00
513-OR
403-GN
578-BU
403-GN
109-OR-6
616-BU
607-PK
323-WH
365-YL
322-GY
506-PU
121-YL
142-BU-14
B
7
8
513-OR
519-PK
200-BK
RD-00
492-GY
9
5
4
3
2
1
6
578-BU
334-BU-14
L16
304-WH-10
A
306-GN
B
152-BU
103-YL
320-OR
124-GN-14
129-BU
185-YL-14
105-BR
113-OR
A877-YL-14
304-WH-10
200-BK-6
200-BK-6
D746-PK
200-BK
B
200-BK
B751-YL
A763-GY
327-PK-16
200-BK
495-GN
200-BK-6
200-BK
A762-PU
D746-PK
AB
235-BK-14
FOR START AID
CONN 1
CONN 2
CONN 3
L20
L16
L40
L11
L22
L42
L42
L42
L42
L42
L42
L42
L42
L42
3
200-BK
ATCH MED. PRESS
VALVE GP
117-2989
NOTE D
AG
103-GY
102-BU 2
1
GROUND
AJ
200-BK
AJ
A771-BU
200-BK
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
3
ENG PICKUP SENSOR -
TRAVEL SW
ENG PICKUP SENSOR +
TRAVEL SOLENOID
FUEL LEVEL SENSOR
COOLANT SENDER
HYD OIL TEMP SENDER
TRAVEL ALARM
4
3
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
ATTACHMENT
32
22
12
2
1
2
ATCH-PRESS SW
101-3082
NOTE D
1
A771-BU
BU
AH
AHAH
ATCH
ANTENNA
106-0036
B
A771-BU
200-BK
1
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
200-BK
2
A771-BU
2
1
L40
L40
L40
L40
L40
AC
AB
L40
200-BK-18
952-OR-18 952-OR-18
200-BK-18
1
2
THROTTLE DIAL S3
THROTTLE DIAL S2
THROTTLE DIAL S1
IMPLEMENT SW
TRENCHING SOLENOID
LEVEL FINISH SOLENOID
491-PK
A771-PU
B737-GN
B965-GY
B964-YL
763-BU
495-GN
492-GY
321-BR
405-GY
788-YL
A762-PU
D746-PK
332-BU
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
101-RD-4
109-OR-6
616-BU
607-PK
323-WH
365-YL
L19
322-GY
506-PU
121-YL
142-BU-14
BK-00
B751-YL
A763-GY
A761-PU
113-OR
142-BU
763-BU
142-BU
B
B
B
LB
LA
L
L
200-BK
L21
L22
L16
L16
L21
L22
L20
495-GN
113-OR
A763-GY
B751-YL
113-OR
A761-PU
5
6
200-BK
B751-YL
A763-GY
A761-PU
113-OR
RD-00
615-YL
120-YL
152-BU
118-GY
103-YL
501-GN
500-BR
320-OR
124-GN-14
129-BU
185-YL-14
105-BR
112-PU-14
CC
101-RD-14
112-PU-14
112-PU-14
308-YL
112-PU-14
112-PU-14
112-PU-14
112-PU-14
615-YL
501-GN
118-GY
500-BR
113-OR
120-YL
877-YL
A983-BU
792-OR
791-PK
WIPER
RELAY
7Y-5490
CAB/CHASSIS
LAMP RELAY
7Y-5490
101-RD-6
101-RD-14
501-GN
GOV ACTR -
ENG
PICKUP
3E-7886
501-GN
118-GY
792-OR
308-YL
200-BK
235-BK235-BK
235-BK
200-BK
235-BK235-BK
L11L11L11
L17
A
A
500-BR
B965-GY
B964-YL
B
B
B
B
B
A768-BU
235-BK
113-OR
L19
615-YL
607-PK
235-BK
XX
WW
WW
101-RD-14
501-GN
118-GY
786-GN
60A
BLOCK AS.
7Y-5499
DD
A769-GY
115-PK
306-GN
ENG GOV
ACTR
119-4941
322-GY
118-GY
A983-BU
A877-YL-14
RESISTOR 7W-1251
L
L
491-PK
365-YL
142-BU-14
1
149-PU
115-PK
124-GN-14
2
113-OR
1
B737-GN
323-WH
DD
142-BU-14
TRAVEL SW
102-8041
DISCONNECT SW
7N-0718
792-OR
L
L
BK-00
HYD OIL
SENDER
4I-5394
200-BK
308-YL
B965-GY
304-WH-10
ENG/PUMP CONT
SOL
5I-8368
MM
TRAVEL SPEED
SOL
4I-5674
109-OR-6
184-BU
200-BK
101-RD-14
308-YL
L
152-BU
A877-YL-14
308-YL
BOOM RAISE SW
102-8042
WW
2
L14
L
1
XX
142-BU
B964-YL
3
4
1
2
A768-BU
2
L
308-YL
118-GY
JJ
L
A983-BU
168-GN
L
L
B
184-BU
L
MAIN RELAY
3T-0376
112-PU-14
T
GOV ACTR +
113-OR
DIODE
121-1022
RELAY PANEL
304-WH-10
1
2
2
1
235-BK
L
616-BU
112-PU-14
877-YL
MM
101-RD-6
786-GN
BK-00
A769-GY
RELAY PANEL
A761-PU
A763-GY
1
2
3
4
5
L22
112-PU-14
A771-PU
200-BK
D764-GN
IMPLEMENT SW
102-8041
B
200-BK
112-PU-14
616-BU
D764-GN
200-BK
A771-PU
200-BK
112-PU-14
142-BU-14
763-BU
B751-YL
B
322-GY
491-PK
109-OR-6
791-PK
2
1
START RELAY
113-2375
1
CHASSIS
304-WH-10
265-BK
2
ENG/PUMP
CONT
119-9969
1
2
RD
BK
607-PK
200-BK
491-PK
763-BU
A769-GY
2
1
STARTER
109-2361
A768-BU
ATCH
REFUELING
RELAY
7Y-5490
B964-YL
323-WH
365-YL
506-PU
129-BU
185-YL-14
615-YL
B965-GY
323-WH
109-OR-6
200-BK
168-GN
113-OR
121-YL
152-BU
A761-PU
616-BU
103-YL
120-YL
184-BU
JJ
607-PK
120-YL
103-YL
114-GN
WW
118-GY
114-GN
A771-PU
TRENCHING SOL
4I-5674
LEVEL FINISH
SOL
4I-5674
2
200-BK
200-BK
1
A
308-YL
112-PU-14
GOV ACTR SENSOR21
BOOM RAISE PRESS. SW
506-PU
306-GN
365-YL
327-PK
320-OR
322-GY
A763-GY
105-BR
BOOM
LAMP
RELAY
7Y-5490
334-BU-14
327-PK
L
L12
10
334-BU-14
D764-GN
REFUELING
LOWER WASHER/WIPER
D764-GN
200-BK
264-BK
7
235-BK
8
9
5
235-BK
200-BK
4
A761-PU
200-BK
B737-GN
334-BU-14
786-GN
200-BK
3
B
327-PK
B
2
109-OR-10
A761-PU
121-YL
B737-GN
200-BK
B
877-YL
1
A877-YL-14
L11
L17
L12
L14
306-GN
L
2
1
10
9
7
8
RELAY PANEL
A/C HEATER
10
CIGAR LIGHTER
BACKUP
ALT
BREAKER
9S-0174
FUSE
10A 9W-1442
15A 9W-1441
20A 9W-1446
WASHER/WIPER
TRAVEL ALARM
ENG/PUMP CONT
DOME LAMP
HORN
SOLENOID
MONITOR
RADIO
1
2
3
4
5
9
8
7
BOOM LAMP
6
7
10
9
5
4
3
2
1
HORN
RELAY
7Y-5490
149-PU
6
10A
10A
10A
10A
3
4
5
10A
10A
10A
20A
CAB/CHASSIS LAMP
10A
10A
15A
10A
YL
BU
PU
7
6
500-BR
118-GY
501-GN
L19
BK
5
10A
WASHER
RELAY
7Y-5490
10A
CHASSIS
4
3
2
1
SIG
GND
OR 24V+
M
6
10A
15A
10A
SIG
15A
B751-YL
GND
8
5V+
ENG SHUTDOWN RELAY
KEY START SW
KEY START SW
CONN 4
CONN 5
CONN 6
CONN 29
CONN 7
CONN 10
CONN 9
CONN 8
CONN 11
L40
LL
AK
308-YL
439-YL
ATCH OVERLOAD
WARNING BUZZER
113-4683
NOTE E
AK
439-YL
586-BR
AK
200-BK
2
1
2
3
1
439-BU
586-BR
OVERLOAD WARNING PRESS. SW 6C6806
BK
RD
586-BR
200-BK 1
2
ATCH OVERLOAD
WARNING SW
7X-6386
NOTE E
L42
L42
200-BK
103-GY
102-BU
200-BK
OR-18
135-BU
BK-18
210-BK
RD-18
BK-18
GROUND
+12 VOLT
+ BATTERY
GROUND
1
2
3
2
1
ATCH
CONVERTER
108-9968
3
1
4
2
S
S
S
S
TO RADIO
200-BK
F
L41
L40
200-BK
103-YL
122-BU
615-YL
L40
L40
G
G
G
G
G
AB
151-GN-18
952-OR-18952-OR-18
200-BK-18
1
2
200-BK-18
151-GN-18
PROVISION
FOR ATCH
AC
ATCH
COMB./SINGL
SOL
6T-5859
NOTE C
151-GN-18
200-BK-18
2
1
ATCH PRESS SW
119-9985
NOTE D
200-BK-18
952-GN-18
952-GN-18
154-OR-18
200-BK
B786-BU
ATCH
A/C UNIT
107-1994
103-YL
124-GN-14
200-BK-14
519-PK
2
A
1
3
4
5
615-YL
306-GN
320-OR
A755-PK
A756-BU
A757-GY
A758-BR
105-BR
308-YL
309-GY
B786-BU
1
A
G
2
185-YL
A
B ZZ
325-PK
2
1
122-BU
AM RADIO 3A-8966
FOR ATCH RADIO
T
1
2
ATCH
RADIO SW
7X-6386
G
185-YL
A768-BU
A769-GY
B730-OR
B731-WH
A
152-BU
615-YL
615-YL
519-PK
124-GN-14
578-BU
HAMMER SW
2
1
365-YL
122-BU
200-BK-14
YL
J
PLATFORM
323-WH
607-PK
GN
RD
BU
BK
GY
5
4
3
1
200-BK
120-YL
307-OR
2
AC
T
BK
RD
U
122-BU
B786-BU
200-BK 200-BK
B786-BU
308-YL
4
6
1
3
5
2
B751-YL
105-BR
6
7
8
9
5
4
3
2
1
10
2
7
8
9
5
4
10
6
1
3
3
2
1
H
H
L30
L30
HH
1
2
3
A877-YL
L9
L10
L8
CAB
4
BK
PLATFORM
B
200-BK
B
YL
ATCH
REFUELING PUMP
6C-5572
ATCH
REFUELING
PUMP SW
4I-5389
1
2
F
EF
A
120-YL
122-BU
120-YL
L2
L4
G
A
OPERATOR STATION
325-PK
H
122-BU
L23
322-GY
325-PK
365-YL
5
6
L10
7
2
519-PK
L6
200-BK
A770-PK
A763-GY
6
4
3
1
5
2
B790-OR
L11
L5
F
B
323-WH
235-BK
1
616-BU
2
3
4
309-GY
B731-WH
B730-OR
200-BK
B740-OR
185-YL
B789-BR
B739-WH
154-OR-18
500-BR
FUEL
SENSOR
105-9993
B790-OR
A763-GY
B751-YL
H
H
501-GN
576-PK
152-BU
235-BK
200-BK-14
575-YL
200-BK
152-BU
200-BK
152-BU
1
A758-BR
2
952-GN-18
575-YL
578-BU
AA
152-BU
B790-OR
A769-GY
A768-BU
B789-BR
B789-BR
B789-BR
B790-OR
185-YL
152-BU
B789-BR
B789-BR
B739-WH
B790-OR
B790-OR
B740-OR
+
-
575-YL
576-PK
A769-GY
B730-OR
185-YL
B731-WH
ATCH
AM/FM RADIO
3A-8966
235-BK
578-BU
152-BU
103-YL
3
4
200-BK
L1
L4
L3
OPERATOR STATION
200-BK
6
7
8
9
5
2
1
10
578-BU
495-GN
L7
L6
L5
200-BK
L3
200-BK
L7
L6
L9
L5
PLATFORM
L23L22
ATCH
REFUELING SW
5C-6108
200-BK
122-BU
501-GN
500-BR
124-GN-14
200-BK
103-YL
118-GY
200-BK
200-BK
200-BK
200-BK
200-BK
200-BK
200-BK
L30
615-YL
B956-PK
L30
B955-YL
501-GN
118-GY
129-BU
113-OR
410-WH
575-YL
1
2
3
4
5
A770-PK
A768-BU
185-YL
2
1
200-BK
1
L7
1
2
A757-GY
200-BK
200-BK
A756-BU
576-PK
B789-BR
B739-WH
B790-OR
B740-OR
A763-GY
B751-YL
152-BU
576-PK
1
2
A
320-OR
2
2
HEATER UNIT
107-1995
ACCEL
BACKUP SW
7N-8008
GOV
BACKUP SW
3T-4405
365-YL
L1
L2
103-YL
DOME LAMP
096-0721
325-PK
L30
A877-YL-14
323-WH
B751-YL
A763-GY
B790-OR
200-BK
103-YL
122-BU
L3
403-GN
325-PK
403-GN
200-BK
607-PK
7
616-BU
322-GY
1
ZZ
410-WH
4
K
103-YL
B739-WH
PROVISION FOR
ATCH SWITCH 7X-6387
(RH CONSOLE)
113-OR
129-BU
B789-BR
K
6
B740-OR
B955-YL
B956-PK
118-GY
501-GN
500-BR
4
3
615-YL
1
200-BK
200-BK
5
1
200-BK
200-BK
2
3
1
952-GN-18
154-OR-18
A755-PK
MULTISWITCH JOYSTICK-RH
113-2524
307-OR
A
H
9
A
6
8
5
PS VALVE
BACKUP SW
3T-4405
185-YL
1
ATCH RADIO AM/FM 3A-8966
2
306-GN
200-BK
L8
320-OR
K
200-BK
GROUND STRAP
7G-1060
A
2
PROVISION FOR
ATCH SWITCH 7X-6388
(RH CONSOLE)
10
615-YL
KA
BACKUP
RESISTOR
102-8015
CONN 12
CONN 13
CONN 14
CONN 29 CONN 30
CONN 16
CONN 15
CONN 19
CONN 20
CONN 21
CONN 22
CONN 17
CONN 18
CONN 24
AG
AG
AF
AF
AF
AF
102-BU
103-GY
ABAB
576-GY
576-GY
576-GY
152-BU
2
1
154-OR-18
200-BK
575-YL
576-PK
200-BK
129-BU
E
F
LOWER
WIPER MOTOR
6C-8438
2
4
615-YL
615-YL
200-BK
J
B955-YL
B956-PK
113-OR
201-BK GROUND
UPPER
WIPER MOTOR
6C-9102
F
+
S
+1
-
MOTOR
1
2
3
4
1
E
200-BK
200-BK
154-BU
4
200-BK
615-YL
3
615-YL
575-YL
152-BU
200-BK
2
A
HORN SW
RIGHT SW
LEFT SW
YL
GN
RD
BU
200-BK
501-GN
BK
BK
RD
A A
1
E
118-GY
D
CAB
E
F
GY
MULTISWITCH JOYSTICK-LH
113-2523
L1
576-PK
3
OPERATOR STATION
MOTOR
-
+1
1
306-GN
S
ATCH
CAB LAMP
3A-8951
3
E
307-OR
SERVICE
METER
6T-7337
ATCH
CAB LAMP
3A-8951
J
D
320-OR
E
200-BK
CIGAR
LIGHTER
9W-0335
NEUTRAL
START SW
9W-2150
ACTION ALARM
3E-6328
MONITOR
7Y-5500
501-GN
200-BK
118-GY
200-BK
307-OR
306-GN
+
+
-
403-GN
+BATTERY
DATA -
DATA +
200-BK
4
3
2
1
113-OR
2
1
200-BK
501-GN
118-GY
4
2
1
2
3
4
615-YL
410-WH
CONN 23
CONN 25
LL
308-YL
501-GN
500-BR
WINDSHIELD
SWITCH
9G-2795
THROTTLE
POS SW
7Y-5465
1
2
3
4
LOW IDLE SW
RIGHT SW
E
5
COM
S1
S2
S3
BR
GN
S4
BU
311-YL
L2
7Y-3918
PK
BK
SWITCH AS
7X-6387
311-YL
309-GY
308-YL
OFF
PREHEATBR
129-BU
L2
A877-YL
L8
L1
B955-YL
B956-PK
403-GN
G
A758-BR
A757-GY
A756-BU
R1
R2
ACC
START
ON
1
2
G
G
200-BK
A755-PK
113-OR
410-WH
200-BK
KEY START SW
L41
AD
1
2
952-OR-18
151-GN-18
ATCH- COMBINED SW
3T3132
NOTE C
151-GN-18
154-OR-18
AC
AD
AC
ATCH CONTROL AR SINGLE 129-4701
154-BU-18
2
1
AE
AE
NOTE C
235-BK
311-YL
B
B
B
B
616-BU
616-BU
200-BK
ATCH
BOOM LAMP
5I-8250
105-BR
307-OR
CHASSIS
G
OPERATOR STATION
HORN
7Y-3919
200-BK
M
N
N
M
B
C
ATCH
BOOM LAMP
5I-8250
200-BK
200-BK
200-BK
200-BK
200-BK
CHASSIS
LAMP
5I-8251
607-PK
HORN
7Y-3920
200-BK
200-BK
322-GY
322-GY
200-BK
322-GY
2
1616-BU
200-BK
200-BK
616-BU
FOR START AID GP
CONN 26
CONN 27
CONN 28
AK
LL
NOTE E : USE WITH ATCH OVERLOAD WARNING
AJ
AF
AH
AG
NOTE D : USE WITH ATCH MEDIUM PRESSURE
NOTE C : USE WITH ATCH COMBINED/SINGLE
L
AD
AB
AC
U
T
XX
UNLESS OTHERWISE SPECIFIED ALL WIRE IS 16 GAUGE.
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
THIS SCHEMATIC IS FOR THE 315 EXCAVATOR.
EE
DD
CC
BB
AA
CABLE AS.
WIRE AS.
AE
N
K
J
H
G
F
E
GY
PU
BR
RED
WHITE
ORANGE
YELLOW
PINK
ABBREV COLOR
BLACK
GRAY
PURPLE
BROWN
DESCRIPTIONSYMBOL
CONNECTOR
ELECTRICAL CONNECTION
TO MACHINE 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.
NOTE A : NORMALLY OPEN BEFORE REFRIGERANT CHARGE.
B
WW
M
S
D
ZZ
JJ
MM
A
C-4 NOTE E
C-3 NOTE E
B-9 NOTE D
F-3 NOTE D
B-8 NOTE D
F-3 NOTE D
F-9
A-2 NOTE C
E-3 NOTE C
A-5 NOTE C
E-5
E-5
D-9
A-11
D-9
D-12
D-12
D-12
A-2 NOTE C
A-2
E-5
F-3
D-4
D-3
E-2
D-2
E-12
D-9
D-6
E-1
A-5
D-7
D-7
D-4
137-1429
115-9149
117-3866
129-5660
119-6933
118-1991
125-0148
128-4032
126-3475
126-3472
106-0027
106-0026
4I-5447
4I-5429
7Y-3947
105-9916
7Y-3946
120-7280
128-9403
7Y-3994
4I-5411
7Y-3868
4I-5463
113-7621
117-5646
6C-9117
122-0393
4I-5448
105-9880
7Y-8105
117-7228
5I-8258
7Y3937
122-1846
119-9412
NOTE B : WITH START AID REPLACE 122-0393 TO 120-7447
(115-9099 CHG H03)
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF.
E77002
12 11 10 8 77 6 2 119 5 4 3
12 11 9 2 1110 8 7 6 5 4 3
F
E
D
C
B
A
F
E
D
C
B
A
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.
ENGINE/PUMP CONTROLLER CIRCUIT.
WASHER/WIPER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
START AID CIRCUIT.
ALL DASHED LINES ARE ATTACHMENTS.
