307B ELECTRICAL SYSTEM SCHEMATIC (AKASHI) USED IN SERVICE MANUAL RENR1081

Connectors
Connector
No. And
Machine
Location
Harness And/or Components
Schematic
Location
Connectors
Connector
No. And
Machine
Location
Harness And/or Components
Schematic
Location
20 Contacts
CONN3
C
E-134-3323
Monitor
D-4
CONN10
D
F-134-3324
Wiper Switch
H-1
CONN5
G
C - 134-3305
E-134-3323
E-4
CONN11
D
F-134-3324
Washer Switch
H-1
CONN6
G
C-134-3305
E-134-3323
E-4
CONN12
D
F-134-3324
Travel Speed Switch
H-1
CONN19
G
C-134-3305
F-134-3324
H-4
CONN14
D
F-134-3324
J-2
CONN20
G
C-134-3305
F-134-3324
H-4
CONN15
D
F-134-3324
Air Bleed Pump Switch
H-2
CONN24
D
F-134-3324
Air Conditioner Switch Panel
J-4
CONN16
D
F-134-3324
Travel Alarm Cancel Switch
H-2
CONN25 F-134-3324
A/C Unit
D-6
CONN17
D
F-134-3324
Power Mode Switch
H-2
CONN28
G
B-134-3304
C-134-3305
E-5
CONN38
E
D-134-3313
Engine Shutdown Timer
H-6
CONN32
A
C-134-3305
G-143-1568
C-5
CONN58
B
G-143-1568
Resistor
C-3
CONN33
E
A-134-3303
C-134-3305
E-8
CONN65
J -51-8217
Wiper Motor
F-2
CONN34
E
C-134-3305
D-134-3313
E-8
CONN68
E
S-134-3331
Travel Alarm Timer
J-6
CONN35
E
C-134-3305
D-134-3313
E-8
CONN8
D
F-134-3324
Neutral Start Limit Switch
J-1
CONN37
E
A-134-3303
D-134-3313
F-7
CONN26
G
C-134-3305
F-134-3324
D-6
9 Contacts
CONN18
D
F-134-3324
Radio-AM/FM
J-2
CONN55
B
G-143-1568
Speaker
C-2
8 Contacts
CONN29 C-134-3305
Governor Controller
D-2
CONN59
B
G-143-1568
Speaker
C-2
CONN2
C
E-134-3323
Governor Actuator
E-2
CONN7 C-134-3305
E-134-3323
E-5
CONN4
G
C - 134-3305
E-134-3323
E-3
CONN21
G
F-134-3324
U-134-3329
H-5
CONN30 C-134-3305
Governor Controller
D-2
CONN22
G
F-134-3324
T-136-4021
H-5
CONN31
A
C-134-3305
H-134-3280
C-5
CONN23
G
F-134-3324
S-134-3331
H-5
CONN39
E
D-134-3313
Hyd Lock Timer
H-6
CONN27
G
C-134-3305
Hyd Lock Solenoid
G-4
CONN40
E
D-134-3313
Start Control Relay
H-6
CONN36
E
C-134-3305
D-134-3313
E-9
CONN60 H-134-3280
J-51-8217
D-2
CONN41 A-134-3303
Auto Lubrication Pump
D-9
CONN70
B
L-143-1567
12V5A Converter
C-2
CONN42 A-134-3303
Auto Refrigerant Low Press Switch
D-9
5 Contacts
CONN9
D
F-134-3324
Light Switch
J-1
CONN43 A-134- 3303
Gov Press Switch
D-7
Harness Connector Location Chart
12 Contacts
6 Contacts
5 Contacts
4 Contacts
3 Contacts
2 Contacts
1
4
3
10
10
9
17
2
1
8
9
10
7
9
19
2
1
18
2
3
6
6
11
16
15
8
1
5
12
4
7
11
4
20
5
5
5
8
7
6
4
3
2
11
8
24
6
1
Connectors
Connector
No. And
Machine
Location
Harness And/or Components
Schematic
Location
Connectors
Connector
No. And
Machine
Location
Harness And/or Components
Schematic
Location
CONN45 A-134-3303
Alternator
C-8
CONN48 A-134-3303
Coolant Temp Sender
B-8
CONN47 A-134-3303
Air Conditioner Clutch Solenoid
C-8
CONN49 A-134-3303
Coolant Temp Switch
B-8
CONN50 B-134-3304
K-134-3325
B-3
CONN51 B-134-3304
Hyd Oil Temp Sender
A-6
CONN52 B-134-3304
Engine/Pump Control Solenoid
A-6
CONN56
B
G-143-1568
Cigar Lighter
C-2
CONN53 B-134-3304
Travel Speed Solenoid
A-6
CONN61 H-134-3280
M-116-0243
E-1
CONN54 B-134-3304
Fuel Sensor
A-6
CONN62 H-134-3280
M-116-0243
E-1
CONN57 G-143-1568
L-143-1567
C-3
CONN63 R-128-8940
Cab Lamp
F-1
CONN67 S-134-3331
Travel Alarm
A-6
CONN64 R-128-8940
Cab Lamp
E-1
CONN69 S-134-3331
Travel Press Switch
D-7
CONN66 T-136-4021
Fuel Pump
A-5
1 Contact
CONN44
A-134-3303
Alternator
C-8
CONN71
E
D-134-3313
T-136-4021
J-7
CONN1
C
E-134-3323
One Touch Low Idle Switch
F-2
CONN72
E
D-134-3313
S-134-3331
J-8
CONN13 F-134-3324
Horn Switch
G-1
CONN73
A
C-134-3305
U-134-3329
C-5
CONN46 A-134-3303
Engine Oil Press Switch
B-8
Harness Connector Location Chart
2 Contacts
Bullet
Terminal
Bullet
Terminal
13
9
26
4
2
1
3
3
7
14
3
12
11
10
12
6
2
21
22
23
5
2
1
3
Machine
Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
1C
Actuator-Governor E-2
35F
Relay-Wiper H-9
2
Alarm - Travel A-6
36B
Resistor - Monitor C-2
3
Alternator B-8
37
Sender - Engine Coolant Temp B-8
4
Antenna H-5
38
Sender - Hydraulic Oil Temp B-6
5
Battery D-9
39
Sensor - Fuel Level A-6
6E
Block - Terminal F-7
40
Solenoid - Air Cond Comp Clutch C-8
7E
Breaker - Alternator F-9
41
Solenoid - Engine Shutdown A-8
8
Cable - Antenna J-4
42G
Solenoid - Hydraulic Lock G-4
9
Controller - Governor D-2
43
Solenoid - Travel Speed A-6
10B
Converter - 12V5A C-2
44
Solenoid - Engine Pump Control A-6
11F
Fuse - Block J-7, 8, 9
45B
Speaker C-2
12
Horn B-2
46D
Switch - Air Bleed Pump H-2
13
Lamp - Boom B-2
47
Switch - Engine Coolant Temp B-8
14
Lamp- Cab E-1, F-1
48
Switch - Disconnect D-9
15
Lamp - Chassis A-3
49
Switch - Engine Oil Press B-8
16
Lamp - Dome B-2
50
Switch - Governor Press D-7
17B
Lighter- Cigar C-2
51D
Switch- Horn G-1
18D
Meter - Service J-2
52D
Switch - Light (Boom/Chassis Lamp) J-1
19C
Monitor D-5
53D
Switch - Light (Cab Lamp) J-2
20
Motor - Starter A-8
54D
Switch - Neutral Start J-1
21
Motor - Washer E-9
55C
Switch - One Touch Low Idle F-2
22
Motor - Wiper F-2
56D
Switch - Power Mode H-2
23
Plug - Glow B-8
57
Switch - Refrigerant Low Press D-9
24
Pump - Auto Lubrication D-9
58C
Switch - Starter E-2
25
Pump - Fuel A-5
59D
Switch - Travel Alarm Cancel H-2
26D
Radio J-2
60
Switch - Travel Press D-7
27F
Relay - Boom/Chassis Lamp H-9
61D
Switch - Travel Speed H-1
28F
Relay - Cab Lamp H-8
62D
Switch - Washer H-1
29E
Relay - Heater G-6
63D
Switch - Wiper H-1
30F
Relay - Horn H-7
64E
Timer - Engine Shutdown H-5
31F
Relay - Neutral Start Lock H-7
65E
Timer - Hydraulic Lock H-5
32E
Relay - Start Control H-5
66E
Timer - Travel Alarm J-5
33E
Relay - Start G-5
67
Unit - Air Conditioner D-6
34F
Relay - Washer/Cigar H-8
68
Unit - Heater D-6
Area A = Inside of Cab,rear
Area B = Inside of Cab,rear
Area C = Inside of R.H. console
Area D = Inside of L.H. console
Area E = Around relay panel
Area F = Inside of Fuse relay box
Area G = Under platform
Component Location
Related Electrical Service Manuals
Form Number
RENR2978
Title
Electrical and Electronic Systems
Off Machine Switch Specification
Part No. Function Actuate Deactuate Contact Position
5I-6587 Engine Oil Pressure
80 ± 10 kPa
(11.6 ± 1.45 psi)
50 ± 10 kPa
(7.3± 1.4 psi)
Normally Open
085-5121 Engine Coolant Temperature
106.0 ± 2.0 °C
(222.8 ± 3.7 °F)
90 °C
(194 °F)
Normally Closed
106-0179
Governor Pressure
Travel Pressure
1225.00 ± 98.00 kPa
(177.67 ± 14.21 psi)
882.00 kPa MIN
(127.92 psi MIN)
Normally Open
Resistor, Sender and Solenoid Specifications
Part No. Component Description Resistance (Ohms)¹
121-1491 32.0 ± 3.2
¹ At room temperature
Solenoid - Hydraulic Lock
Wire Description
Wire
Number
Wire
Color
Description
Wire
Number
Wire
Color
Description
Power Distribution Circuits
Accessory Circuits (Continued)
101 RD Bat(+) 500 BR Wiper-Front (Park)
103 RD Aux Ckt 501 GN Wiper - Front (Low)
105 RD Key Sw 506 PU Washer - Front
107 RD Eng Shut 508 PU Radio Speaker - Left
109 RD Alt Output (+) Term. 509 WH Radio Speaker - Left (Common)
110 RD Aux Ckt 511 BR Radio Speaker - Right
112 PU Main Power RIy Output 512 GN Radio Speaker - Right (Common)
113 OR Opr Mon Panel B+ Switched 513 OR A/C Compressor/Refrigerant Pressure SW
114 RD Warning Horn (Forward) 515 GY Blower Motor (HI)
115 RD Aux Ckt 516 GN Blower Motor (Medium)
118 RD Aux Ckt 517 BU Blower Motor (Low)
121 YL Back Alarm To Lamp 519 PK Thermostat To Refrigerant Press. SW
124 GN A/C 520 WH Opr A/C SW To Thermostat/Fuse
127 RD Aux Ckt A523 PU Temp Potentiometer Pos 1
129 BU Aux Ckt A524 BR Temp Potentiometer Pos 2
135 BU Aux Ckt A525 GN Temp Potentiometer Pos 3
142 BU Aux Ckt A588 GN Safety Sol Relay To Sol
150 RD Bat (+) Lighting Circuits
151 GN Aux Ckt 607 PK Flood Lamp - Front
168 GN Aux Ckt 615 YL Cab Flood Lamp/Rops
180 GN Aux Ckt 616 BU Bucket Flood Lamp/Boom Flood Lamp
190 PK Aux Ckt Control Circuits
Ground Circuits 763 BU Torque Converter SW
200 BK Main Chassis 786 GN Eng Speed Cont - Hi Press SW
Basic Machine Circuits 791 PK Eng Speed Cont - Lo Sol
303 BR Key SW ACC Position 792 OR Underspeed Proportional Sol
304 WH Starter Relay No. 1 Output 799 WH Sensor PowerLow Idle SW
306 GN Starter Relay Coil B786 BU Low Idle SW
307 OR Key SW To Neutral Start SW H740 OR HEX Governer Motor +
310 PU Start Aid SW To Start Aid Sol H741 WH HEX Governer Motor -
320 RD Horn Relay Coil To SW H742 PU HEX Governor Accel Input
321 BR Travel Alarm H743 YL HEX Governor Decel Input
322 GY Warning Horn (Forward) H744 BU HEX Governor Low Idle
323 WH Fuel Pump Power H745 BR HEX Governor SW Return
327 PK Shutdown Solenoid J703 PK Alt Pulse Sig To Anti-Start Relay
330 YL Neutral Start Relay Coil K776 GN Alternator L terminal
332 BU Shutdown SW To Shutdown Ctrl K777 GY Implement Pressure
Monitoring Circuits K778 WH Hydraulic Excavator Pwr Mode Valve
403 GN Alternator (R) Term. 817 WH Back-Up Alarm Relay
405 GY Opr Mon Oil Press. (Low Setting) 877 YL Glow Plug Magnetic SW To Glow Plug
406 PU Opr Mon Coolant Temp D813 OR Low Idle SW HEDC
441 OR Eng Coolant Temp Gauge N933 PU Low Idle Indicator
442 GY Hyd System Temp Gauge
447 PK Fuel Level Gauge
G480 GN 12 Volt (Fuel Indicator)
G481 WH 12 Volt (Coolant Temperature Indicator)
G482 PK 12 Volt (Hydraulic Temperature Indicator)
1
2
83
19
58
1
55
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
3
4
5
8
9
12
14
15
13
16
2
20
21
22
23
24
25
68
67
37
38
39
40
41
43
44
47
48
49
50
60
26
57
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
A
3
4
5
8
9
12
14
15
13
16
B
C
D
E
2
20
21
22
23
24
25
37
38
14
G
39
40
41
43
44
47
48
49
50
53
54
60
57
13
1
2
3
4
5
6
7
8
9
10
11
12
11
63
51
62
61
52
53
46
59
56
26
7
66
27
28
29
30
31
32
65
35
33
34
64
6
42
54
18
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
12
AREA G
AREA E
AREA D
AREA F
1
2
3
4
5
6
1
2
3
17
45
45
36
10
©
1998 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR1092
May 1998
307B Excavator
Electrical System
5CW1-UP
AREA A
AREA B
AREA C
25
B
D
A AA
1
2
325-PK-14
200-BK-14
T
This indicates that the component does not have a wire connected to ground. It is
grounded by being fastened to the machine.
This indicates that the component has a wire connected to it that is connected to ground.
105-9344
T
Normally open switch that will close with an increase of a specific condition (temp-press-etc.).
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
Pin
Socket
Fuse
Component
Part Number
Pin or Socket
Number
Receptacle
Plug
Wire Gauge
Wire, Cable, or Harness
Assembly Identification
Wire Color
Normally closed switch that will open with an increase of a specific condition.
No circle indicates that the wire cannot be disconnected from the component.
Single Wire
Connector
Circuit Number
Identification
Ground
Connection
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Circuit Breaker
Symbol
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.
Harness And Wire Symbols
Electrical Schematic Symbols And Definitions
1
1
2
2
Typical representation of a Sure-Seal
connector. The plug and receptacle
contain both pins and sockets.
Typical representation of a Deutsch
connector. The plug contains all
sockets and the receptacle contains
all pins.
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.
MONITORING CIRCUIT.
WIPER/WASHER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
START AID CIRCUIT.
CONTROLLER CIRCUIT.
OPERATOR STATION
C
OFF
323-WH-18
200-BK-18
799-WH-18
168-GN-18
K776-GN-18
113-OR-18
200-BK-18
135-BU-18
200-BK-18
113-OR-18
113-OR-18
113-OR-18
135-BU-18
168-GN-18
K776-GN-18
A
129-BU-18
1
2 200-BK-18
129-BU-18
200-BK-18
129-BU-18
ATCH AUTO
LUBRICATION PUMP
127-5264
GROUND
ON (KEY)
129-BU-18
129-BU-18
129-BU-18
129-BU-14
129-BU-14
200-BK-18
817-WH-18
200-BK-18
135-BU-18
615-YL
786-GN-18
142-BU-18
103-RD-18
112-PU-10
113-OR-18
129-BU-14
307-OR-18
A588-GN-18
105-RD-10
124-GN-14
791-PK-18
607-PK-18
616-BU
322-GY-18
320-RD-18
792-OR-18
118-RD
501-GN
500-BR
113-OR-18
168-GN-18
121-YL-18
403-GN-18
107-RD-14
303-BR-18
150-RD-18
321-BR-18
799-WH-18
332-BU-18
151-GN-18
330-YL-18
310-PU-18
877-YL-18
J703-PK-18
403-GN-18
K776-GN-18
4
1
2
3
CONVERTER
113-OR-18113-OR-18
TO AUX
RADIO
200-BK-18
616-BU-18
151-GN-18
200-BK-18
200-BK-18
168-GN-18
323-WH-18
200-BK-18
616-BU-18
200-BK-18
616-BU-18
142-BU-18
200-BK-18
616-BU-18
200-BK-18
616-BU-18
K778-WH-18
A588-GN-18
786-GN-18
799-WH-18
616-BU-18
200-BK-18
200-BK-18
142-BU-18
320-RD-18
791-PK-18
763-BU-18
129-BU-18
792-OR-18
506-PU-18
K776-GN-18
K776-GN-18
616-BU-18
200-BK-18
G480-GN-18
G481-WH-1812V IN(COOLANT TEMP IND)
12V IN(FUEL IND)
11
9
7
8
103-RD-18
512-GN-18
509-WH-18
508-PU-18
113-OR-18
5
3
1
2
6
4
10
12
8
7
9
11
C
E
200-BK
129-BU
509-WH-18
508-PU-18
511-BR-18
512-GN-18
113-OR-18
G480-GN-18
799-WH-18
786-GN-18
321-BR-18
10
12
8
7
9
5
3
1
2
6
4
G
113-OR-18
G480-GN-18
G482-PK-18
G481-WH-18
RESISTOR
140-0924
615-YL
200-BK
615-YL
786-GN-18
BLOCK AS.
7Y-5499
135-BU-18
200-BK-18
200-BK-18
113-OR-18
CONVERTER
134-1346
IGN
GND
IN (+BAT)
OUT (+12V)
MEMORY
G482-PK-18
G481-WH-18
200-BK-18
135-BU-18
200-BK-18
129-BU-18
ATCH
12V SOCKET
121-0987
129-BU
135-BU-18
321-BR-18
ATCH 12V 5A
CONVERTER
119-1733
129-BU-18
1
2
NOTE B: USE WITH AM/FM RADIO.
786-GN-18
L18
L23
L22
L19
L22
L23
615-YL
786-GN-18
L17
L20
L20
L19
L20
L19
L18
L18
129-BU
L14
L14
L10
L15
L16
200-BK
L15
200-BK-18
L17
L14
L6
L7
512-GN-18
L16
L8
L7
L6
L13
L9
L13
511-BR-18
G481-WH-18
200-BK-18
G482-PK-18
G480-GN-18
113-OR-18
200-BK
500-BR
129-BU
R
P
N
D
508-PU-18
509-WH-18
304-WH-10
877-YL-8
109-RD-8
101-RD-8
168-GN-18
200-BK
109-RD-10
306-GN-18
109-RD-14
877-YL-18
101-RD-10
101-RD-14
310-PU-18
J703-PK-18
330-YL-18
K776-GN-18
403-GN-18
151-GN-18
150-RD-18
200-BK-18
303-BR-18
200-BK-18
332-BU-18
327-PK-14
107-RD-14
500-BR
501-GN
118-RD
792-OR-18
190-PK
200-BK-18
320-RD-18
322-GY-18
200-BK-18
150-RD-18
121-YL-18
142-BU-18
FUEL AIR BLEED
168-GN-18
616-BU
200-BK-18
786-GN-18
180-GN
AUX CKT
127-RD
607-PK-18
616-BU
115-RD
791-PK-18
500-BR
501-GN
320-RD-18
322-GY-18
114-RD-18
114-RD-18
101-RD-14
109-RD-14
101-RD-14
101-RD-10
190-PK
103-RD-18118-RD
118-RD
112-PU-10 112-PU-10
127-RD
L4
ATCH
CAB
LAMP RELAY
140-0866
303-BR-18
124-GN-14
607-PK-18
115-RD
127-RD
ENG SHUTDOWN SOL
791-PK-18
511-BR-18
NEUTRAL
START LOCK
RELAY
140-0866
124-GN-14
105-RD-10
135-BU-18
135-BU-18
10A
10A
15A
30A
110-RD-14
A588-GN-18
CHASSIS/BOOM LAMP
WIPER
306-GN-18
118-RD
L4
307-OR-18
L4
L7
WASHER/CIGAR
CAB LAMP
A588-GN-18
10A
15A
115-RD
109-RD-10
109-RD-14
10A
GOV ACTR
307-OR-18
10A
114-RD-18
129-BU-14
30A
15A
129-BU-18
103-RD-18
TRAVEL ALARM
101-RD-10
110-RD-14
200-BK-18
113-OR-18
112-PU-18
WASHER/CIGAR
RELAY
140-0866
168-GN-18
112-PU-10
103-RD-18
MONITOR/RADIO
113-OR-18
200-BK-18
142-BU-18
200-BK-18
HORN
DOME LAMP
121-YL-18
10A
10A
L8
10A
10A
306-GN-18
307-OR-18
A588-GN-18
L4
615-YL
190-PK
109-RD-10
107-RD-14
CHASSIS/BOOM
LAMP RELAY
140-0866
10A
10A
10A
10A
L9
124-GN-14
107-RD-14
792-OR-18
A/C HEATER
WIPER RELAY
140-0866
112-PU-18
105-RD-10
HORN RELAY
140-0866
112-PU
10A
303-BR-18
HYD LOCK
KEY SW
10A
105-RD-10
L1
791-PK-18
L2
607-PK-18
616-BU
322-GY-18
320-RD-18
792-OR-18
118-RD
SOLENOID
15A
501-GN
500-BR
113-OR-18
HYD LOCK TIMER
150-RD-18
FUSE BASE
136-4072
142-BU-18
FUSE
10A 9W-1442
15A 9W-1441
30A 8T-9636
RELAY PANEL
200-BK
200-BK-18
200-BK
190-PK
327-PK-14
817-WH-18
190-PK
200-BK
817-WH-18
J703-PK-18
4
3
101-RD-14
101-RD-10
109-RD-14
306-GN-18
786-GN-18
109-RD-10
L1
L2
L6
OPERATOR STATION
403-GN-18
A588-GN-18
321-BR-18
799-WH-18
OPERATOR STATION
OPERATOR STATION
OPERATOR STATION
OPERATOR STATION
OPERATOR STATION
OPERATOR STATION
RELAY PANEL
RELAY PANEL
RELAY PANEL
RELAY PANEL
506-PU-18
200-BK-18
616-BU-18
200-BK-18
616-BU-18
200-BK-18
792-OR-18
129-BU-18
200-BK-18
200-BK-18
616-BU-18
763-BU-18
791-PK-18
142-BU-18
200-BK-18
616-BU-18
817-WH-18
200-BK-18
118-RD
129-BU
BATTERY
3T-5760
113-OR-18
200-BK-18
K776-GN-18
129-BU-18
799-WH-18
200-BK-18
786-GN-18
615-YL
403-GN-18
ALTERNATOR
151-GN-18
142-BU-18
310-PU-18
332-BU-18
330-YL-18
877-YL-18
129-BU-14
320-RD-18
322-GY-18
113-OR-18
105-RD-10
112-PU-10
616-BU
607-PK-18
103-RD-18
124-GN-14
501-GN
791-PK-18
792-OR-18
500-BR
307-OR-18
A588-GN-18
403-GN-18
118-RD
11
9
7
8
12
10
4
6
2
1
3
5
11
9
7
8
12
10
4
6
2
1
3
5
11
9
7
8
12
10
K776-GN-18
K777-GY-18
441-OR-18
405-GY-18
406-PU-18
519-PK-18
EE
GG
KK
JJ
HH
GG
FF
EE
D
DDD
AA
CCC
C C
168-GN-18
118-RD
A588-GN-18
307-OR-18
500-BR
792-OR-18
791-PK-18
501-GN
124-GN-14
A
PK
OR
C
A
MOTOR
103-RD-18
607-PK-18
616-BU
112-PU-10
105-RD-10
K777-GY-18
200-BK-18
113-OR-18
322-GY-18
320-RD-18
129-BU-18
877-YL-18
330-YL-18
332-BU-18
4
6
310-PU-18
2
1
3
513-OR-18 519-PK-18
513-OR-18
GROUND STRAP
134-3344
K777-GY-18
190-PK-18
2
1
321-BR-18
ATCH
TRAVEL
PRESS. SW
106-0179
2
1
101-RD-6
109-RD-6
304-WH-10
877-YL-8
2
3
PRESS. SW
106-0179
200-BK-18
142-BU-18
151-GN-18
K776-GN-18
4
WASHER
096-0486
1
K777-GY-18
441-OR-18
405-GY-18
406-PU-18
519-PK-18
190-PK
112-PU-18
K776-GN-18
200-BK
190-PK
112-PU-18
519-PK-18
406-PU-18
405-GY-18
441-OR-18
K777-GY-18
K776-GN-18
190-PK-18
101-RD-8
109-RD-8
817-WH-18
190-PK
877-YL-8
304-WH-10
109-RD-6
101-RD-6
200-BK
190-PK
K777-GY-18
101-RD-6
304-WH-10
327-PK-14
877-YL-8
406-PU-18
J703-PK-18
109-RD-6
403-GN-18
K776-GN-18
403-GN-18
327-PK-14
519-PK-18
AA
A A
441-OR-18
405-GY-18
877-YL-8
304-WH-10
BB
CC
CHASSIS
109-RD-6
101-RD-6
190-PK-18
506-PU-18
ALT BREAKER
6T-3645
5
109-RD-6101-RD-6
BK-0
ATCH
REFRIGERANT SW
105-9344 (NOTE A)
60A
POS
NEG NEG
POS
RD-0RD-0
2
1
501-GN
5
6 GND
12V OUT
12V MEMORY
GND
24V IN
24V MEMORY129-BU-18
200-BK-18
112-PU-14
RD-0
BK-18
113-OR-18
BK-18
200-BK-18
200-BK
200-BK-18
200-BK-18
200-BK-18
2
1
200-BK-18
200-BK-18
200-BK-18
200-BK-18
190-PK-18
K776-GN-18
ATCH
A/C CLUTCH SOL
117-6353
405-GY-18
441-OR-18
403-GN-18
K776-GN-18
109-RD-6
J703-PK-18
406-PU-18
877-YL-8
327-PK-14
200-BK-18
200-BK-18
405-GY-18
A
A
A
441-OR-18
403-GN-18
A
406-PU-18
A
A
A
AA
A
304-WH-10
101-RD-6
101-RD-6
MOTBAT
S
MOTOR
L
E
B
P
R
ALT
GLOW PLUG
139-7841
ALTERNATOR
139-7850
COOLANT TEMP SENDER
095-3757
STARTER
K776-GN-18
200-BK-6
ENG OIL PRESS. SW
5I-6587
ENG
SHUTDOWN SOL
139-8247
513-OR-18
323-WH-18
513-OR-18
ENG
A
109-RD-6
200-BK-6
200-BK
A
A
J703-PK-18
CHASSIS
A
200-BK-18
304-WH-10
513-OR-18
101-RD-6
A
304-WH-10
RD-0
327-PK-14
327-PK-14
COOLANT TEMP SW
085-5121
877-YL-8
D
D
D
BK-0
RELAY PANEL
616-BU
112-PU-18
403-GN-18
200-BK-18
320-RD-18
200-BK-18
ATCH
ANTENNA
CABLE
111-4846
817-WH-18
327-PK-14
DD
403-GN-18
K776-GN-18
J703-PK-18
168-GN-18
142-BU-18
K776-GN-18
799-WH-18
817-WH-18
321-BR-18
121-YL-18
200-BK-18
615-YL
C
D
F
113-OR-18
107-RD-14
327-PK-14
332-BU-18113-OR-18
200-BK-18
135-BU-18
121-YL-18
321-BR-18
817-WH-18
799-WH-18
303-BR-18
200-BK-18
150-RD-18
151-GN-18
330-YL-18
310-PU-18
101-RD-10
START RELAY
085-5200
HEATER RELAY
085-5353
109-RD-10
877-YL-8
306-GN-18
109-RD-8
109-RD-14304-WH-10
101-RD-8
520-WH-18
200-BK
515-GY
516-GN
517-BU
A523-PU-18
A525-GN-18
A524-BR-18
KK
JJ
HH
FF
CC
FFFFF
F
D
D
D
D
101-RD-8
304-WH-10
109-RD-8
877-YL-8
11
9
7
8
12
10
4
6
2
1
3
323-WH-18
168-GN-18
11
9
7
8
12
10
4
6
2
1
3
200-BK-18
103-RD-18
616-BU-18
512-GN-18
509-WH-18
508-PU-18
511-BR-18
135-BU-18
506-PU-18
763-BU-18
FAN SWTHERMO
VOL
A/C SW
ATCH
A/C SW PANEL
135-2187
799-WH-18
817-WH-18
321-BR-18
GND
D
501-GN
5
ATCH TRAVEL
ALARM TIMER
122-2371
K778-WH-18
5
320-RD-18
792-OR-18
129-BU-18
791-PK-18
786-GN-18
799-WH-18
142-BU-18
K778-WH-18
763-BU-18
506-PU-18
K776-GN-18
511-BR-18
113-OR-18
508-PU-18
509-WH-18
512-GN-18
616-BU-18
103-RD-18
2
1
H
M
L
877-YL-18
200-BK-18
142-BU-18
2
1
+ BATTERY
ALARM
CANCEL
PRESS.
118-RD
500-BR
6
2
1
3
5
4
9
8
7
ATCH
HEATER SW PANEL
135-2188
791-PK-18
792-OR-18
129-BU-18
320-RD-18
200-BK-18
151-GN-18
121-YL-18
A588-GN-18
A588-GN-18
A588-GN-18
151-GN-18
101-RD-14
877-YL-18
101-RD-14
101-RD-10
109-RD-14
306-GN-18
109-RD-10
200-BK-18
200-BK-18
403-GN-18
K776-GN-18
330-YL-18
J703-PK-18
310-PU-18
BK
3
2
1
4
330-YL-18
PLATFORM
CHASSIS
GROUND STRAP
1S-2342
HYD LOCK
TIMER
132-1817
151-GN-18
150-RD-18
200-BK-18
OUT 1
OUT 2
GND
200-BK-18
332-BU-18
BK-18
GN-18
BU-14
RD-14
J703-PK-18
330-YL-18
K776-GN-18
+B
+ BATTERY
403-GN-18
IN 1
GND
303-BR-18
GND
SOLENOID
ON (KEY)
200-BK-18
ENG SHUTDOWN
TIMER
138-5190
START CONT
RELAY
122-5545
327-PK-14
WH/BU
YL
BK
WH/YL
WH/GN
107-RD-14
P
L
R
S
GROUND
G481-WH-18
G482-PK-18
G480-GN-18
200-BK-18
G482-PK-18
G481-WH-18
G482-PK-18
G480-GN-18
G481-WH-18
G482-PK-18
200-BK-14
200-BK
200-BK
200-BK-18
1
200-BK-18
129-BU
615-YL
129-BU
113-OR-18
2
3
4
5
6
D
D
D
G480-GN-18
A588-GN-18
103-RD-18
200-BK-18
615-YL
200-BK
200-BK
H
G482-PK-18
G481-WH-18
200-BK
200-BK-18
BK
RD
BK
DISCONNECT
SW
7N-0718
PLATFORM
C
RD
200-BK-18
506-PU-18
11
9
7
8
12
10
4
6
2
1
3
5
321-BR-18
323-WH-18
615-YL
129-BU-14
FUSE
132-1862
200-BK-18
A523-PU-18
520-WH-18
515-GY
516-GN
517-BU
200-BK
B
E
E
D
E
C
D
CC
NOTE C: USE WITH OFFSET BOOM.
C F
F
H740-OR
H741-WH
H742-PU-18
H743-YL-18
H744-BU-18
H745-BR-18
H745-BR-18
H744-BU-18
H743-YL-18
H742-PU-18
H741-WH
H740-OR
H740-OR
H741-WH
H742-PU-18
H743-YL-18
H744-BU-18
H745-BR-18
616-BU
322-GY-18
607-PK-18
200-BK-18
441-OR-18
877-YL-18
330-YL-18
405-GY-18
406-PU-18
616-BU-18
105-RD-10
307-OR-18
310-PU-18
112-PU-10
332-BU-18
190-PK
K777-GY-18
103-RD-18
501-GN
500-BR
118-RD
320-RD-18
129-BU-18
792-OR-18
791-PK-18
151-GN-18
A588-GN-18
142-BU-18
506-PU-18
616-BU-18
103-RD-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK
C
200-BK-18
200-BK-18
K778-WH-18
118-RD
500-BR
501-GN
103-RD-18
511-BR-18
508-PU-18
509-WH-18
512-GN-18
K777-GY-18
190-PK
332-BU-18
112-PU-10
1310-PU-18
307-OR-18
105-RD-10
616-BU-18
406-PU-18
405-GY-18
330-YL-18
877-YL-18
441-OR-18
113-OR-18
2
607-PK-18
322-GY-18
616-BU
200-BK-18
616-BU
322-GY-18
607-PK-18
447-PK-18
K778-WH-18
763-BU-18
442-GY-18
200-BK-18
113-OR-18
447-PK-18
441-OR-18
442-GY-18
877-YL-18
330-YL-18
405-GY-18
406-PU-18
N933-PU-18
616-BU-18
105-RD-10
307-OR-18
310-PU-18
112-PU-10
332-BU-18
B786-BU-18
D813-OR-18
763-BU-18
200-BK-18
200-BK
190-PK
K777-GY-18
N933-PU-18
B786-BU-18
D813-OR-18
512-GN-18
509-WH-18
508-PU-18
511-BR-18
103-RD-18
501-GN
500-BR
118-RD
C
FUEL TANK UNIT
ILLUM
HEATER RELAY
HYD OIL TEMP SENDER
ONE TOUCH LOW IDLE
+ BATTERY
GND
START CONT RELAY
ENG OIL PRESS. SW
COOLANT TEMP SW
COOLANT TEMP SENDER
MONITOR
143-1557
12V IN(HYD OIL TEMP IND)
20
200-BK-18
113-OR-18
GND 200-BK-18
447-PK-18
441-OR-18
442-GY-18
877-YL-18
330-YL-18
405-GY-18
19
406-PU-18
N933-PU-18
616-BU-18
200-BK-18
113-OR-18
616-BU-18
N933-PU-18
18
17
16
15
406-PU-18
105-RD-10
307-OR-18
310-PU-18
112-PU-10
332-BU-18
405-GY-18
330-YL-18
877-YL-18
442-GY-18
441-OR-18
447-PK-18
C
118-RD
500-BR
501-GN
103-RD-18
N933-PU-18
B786-BU-18
D813-OR-18
K777-GY-18
190-PK
200-BK
200-BK-18
11
9
7
8
G480-GN-18
113-OR-18
512-GN-18
511-BR-18
508-PU-18
103-RD-18
200-BK
501-GN
500-BR
615-YL
12
10
4
6
A525-GN-18
2
A524-BR-18
1
3
5
D813-OR-18
B786-BU-18
332-BU-18
112-PU-10
310-PU-18
307-OR-18
105-RD-10
616-BU-18
N933-PU-18
406-PU-18
C
405-GY-18
330-YL-18
877-YL-18
442-GY-18
441-OR-18
447-PK-18
113-OR-18
200-BK-18
509-WH-18
129-BU
200-BK
RELAY PANEL
L21
GND
RYCL
4
6
2
1
3
5
D
200-BK-14
11
9
7
8
12
10
4
6
2
1
3
5
B786-BU-18
D813-OR-18
A/C SW
H
M
L
ATCH
A/C UNIT
135-2186
GND
H745-BR-18
H744-BU-18
H743-YL-18
H742-PU-18
H741-WH
H740-OR
+24V
519-PK-18
124-GN-14
CONTROLLER
CONTROLLER
ATCH
HEATER UNIT
133-7981
CONTROLLER
200-BK-14
A
B
C
200-BK-14
124-GN-14
519-PK-18
11
9
7
8
12
10
4
6
2
1
3
5
442-GY-18
763-BU-18
K778-WH-18
447-PK-18
607-PK-18
322-GY-18
616-BU
H740-OR
H741-WH
H742-PU-18
H743-YL-18
H744-BU-18
H745-BR-18
C
E
12
10
4
L21
G
6
14
13
2
L21
1
3
5
2
1
323-WH-18
321-BR-18
11
200-BK-18
RELAY PANEL
L10
L9
L12
L12
L11
406-PU-18
441-OR-18
L11
L5
321-BR-18
L3
323-WH-18
LL
1
2
2
1
1
2
B
B
B
2
1
B
323-WH-18
616-BU
322-GY-18
607-PK-18
200-BK-18
447-PK-18
K778-WH-18
200-BK
763-BU-18
442-GY-18
200-BK-18
447-PK-18
200-BK-18
G480-GN-18
CHASSIS
G482-PK-18
G481-WH-18
442-GY-18
K778-WH-18
TRAVEL SPEED
SOL
126-9992
442-GY-18
200-BK-18
HYD OIL
TEMP SENDER
096-4643
763-BU-18
BK
607-PK-18
200-BK-18
K778-WH-18
200-BK-18
ATCH
FUEL PUMP
103-0367
447-PK-18
200-BK-18
200-BK-18
200-BK-18
ENG/PUMP CONT
SOL
126-9992
K778-WH-18
MOTOR
763-BU-18
447-PK-18
200-BK
442-GY-18
616-BU
442-GY-18
322-GY-18
200-BK-18
763-BU-18
BK/YL
K778-WH-18
447-PK-18
103-RD-18
200-BK-18
200-BK-18
200-BK
T°
615-YL
118-RD
500-BR
501-GN
B
BK
BK
B
FUEL
SENSOR
105-9911
L3
BK
YL
321-BR-18
200-BK-18
L3
ATCH
TRAVEL ALARM
3E-7738
763-BU-18
511-BR-18
113-OR-18
508-PU-18
151-GN-18
509-WH-18
512-GN-18
103-RD-18
129-BU
200-BK-18
200-BK-18
616-BU-18
200-BK-18
200-BK-18
168-GN-18
323-WH-18
200-BK-18
616-BU-18
200-BK-18
616-BU-18
200-BK-18
616-BU-18
K778-WH-18
142-BU-18
786-GN-18
799-WH-18
616-BU-18
320-RD-18
200-BK-18
616-BU-18
200-BK-18
142-BU-18
791-PK-18
763-BU-18
616-BU-18
200-BK-18
200-BK-18
129-BU-18
792-OR-18
200-BK-18
616-BU-18
200-BK-18
616-BU-18
B
A
200-BK-18
C
F
F
F
F
F
F
F
F
F
F
F
F
NEUTRAL START
LIMIT SW
111-4799
151-GN-18
A588-GN-18
C
B
A
103-RD-18
ILLUMI (+)
GND
ACC (+)
BACKUP
SPEAKER RH(-)
ANTENNA
ATCH
AM/FM RADIO
136-4060 (NOTE B)
SPEAKER LH(+)
SPEAKER LH(-)
SPEAKER RH(+)
616-BU-18
200-BK-18
512-GN-18
509-WH-18
508-PU-18
113-OR-18
511-BR-18
200-BK-18
616-BU-18
799-WH-18 WH
YL
BK
BU
3
1
5
4
2
ATCH
TRAVEL ALARM
CANCEL SW
136-4004
3
4
5
2
1
RD
BK
YL
BU
WH
BK
YL
RD
3
1
5
4
2
WH
3
4
RD
2
BK
5
YL
1
WH
3
4
5
1
200-BK-18
506-PU-18
786-GN-18
142-BU-18
K778-WH-18
2
YL
BK
616-BU-18
POWER
MODE SW
136-4003
ATCH CAB
LIGHT SW
136-3998
WASHER SW
136-4000
200-BK-18
616-BU-18
WIPER SW
136-3999
200-BK-18
616-BU-18
200-BK-18
792-OR-18
200-BK-18
320-RD-18
616-BU-18
200-BK-18
129-BU-18
BU
HORN SW
128-2134
616-BU-18
200-BK-18
ATCH AIR
BLEED SW
136-4001
3
1
5
4
2
WH
YL
BK
BU323-WH-18
168-GN-18
506-PU-18
135-BU-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
200-BK-18
LIGHT SW
(BOOM LAMP)
136-3998
TRAVEL
SPEED SW
136-4002
616-BU-18
2
763-BU-18
791-PK-18
142-BU-18
1
5
4
3
WH
YL
BK
RD
WH
YL
BK
RD
1
2
5
4
3200-BK-18
616-BU-18
HYD LOCK SOL
121-1491
200-BK-18
A588-GN-18
2
1
ATCH
ANTENNA
106-0036
ATCH
CIGAR
LIGHTER
9W-0335
200-BK
200-BK-18
SERVICE
METER
6T-7337
+
-
K776-GN-18
G
200-BK-18
ATCH
CAB LAMP
143-1617
R
200-BK
615-YL
ATCH
CAB LAMP
105-9949
R
RD-18
WH-18
ATCH CAB LAMP (NOTE C)
ATCH CAB LAMP
H
200-BK-18
615-YL-18
WH-18
RD-18
R
ATCH
CAB LAMP
105-9949
615-YL
200-BK
R
615-YL-18
200-BK-18
H
200-BK-184
6
2
1
3
5
E
M
GY
PU
BR
RED
WHITE
ORANGE
YELLOW
PINK
ABBREV COLOR
BLACK
GRAY
PURPLE
BROWN
BK
PK
YL
OR
WH
RD
GN
BU
GREEN
BLUE
H
M
127A
L5
200-BK
H
615-YL
M
ATCH
CAB LAMP
143-1617
H745-BR-18
H744-BU-18
H743-YL-18
H742-PU-18
H741-WH
L13
WH
GN
OR
YL
BK
PK
200-BK-18
200-BK-18
615-YL
200-BK-18
200-BK-18
615-YL
M
D813-OR-18
615-YL-18
KNOB
7Y-9390
KEY SW
7Y-3918
ENG GOV ACTR
132-7818
E
J
J
B786-BU-18
H740-OR
E
332-BU-18
M
112-PU-10
310-PU-18
307-OR-18
105-RD-10
OFF
PREHEATBR
R1
H
B
200-BK-18
WH/BK-20
BU/BK-20
BU-20
BU/WH-20
ONE TOUCH
LOW IDLE SW
128-2134
C
615-YL-18
R2
+
S
+1
-
MOTOR
ACC
START
ON
WIPER
122-5322
501-GN
118-RD
500-BR
200-BK
323-WH-18323-WH-18
321-BR-18321-BR-18
323-WH-18
200-BK-18
D
D
L8
CAB
200-BK-18
200-BK
200-BK-18
200-BK-18
3
1
200-BK-18
321-BR-18
2
4
200-BK
118-RD
NC
7
8
4
6
2
1
3
5
KK
JJ
C
C
WIRE AS.
GG
24V IN
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF.
ATCH
SPEAKER(LH)
7Y-5434 (NOTE B)
AA
CABLE AS.
G
H
200-BK-18
103-RD-18
DOME LAMP
096-0721
509-WH-18
A
12V OUT(FUEL IND)
508-PU-18
B
129-BU-18
B
DESCRIPTIONSYMBOL
CONNECTOR
ELECTRICAL CONNECTION
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
BLADE, SPADE, RING,
OR SCREW TERMINAL
G
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ATCH WIRE, CABLE,
COMPONENT
ATCH
SPEAKER(RH)
7Y-5434 (NOTE B)
L#
511-BR-18
512-GN-18
CIRCUIT GROUPING
DESIGNATION
IDENT PART NO. LOC
HARNESS AS.
2
1
200-BK-18
200-BK
190-PK
K777-GY-18
N933-PU-18
B786-BU-18
D813-OR-18
CONTROLLER
132-7764
322-GY-18
K
N (NOTE C)
P
200-BK
615-YL
200-BK
4
6
2
1
3
5
P
K
N (NOTE C)
ATCH
BOOM LAMP(LH)
143-1617
616-BU
200-BK
616-BU
12V OUT(HYD OIL TEMP IND)
200-BK
CHASSIS LAMP
143-1617
200-BK
BB
12V OUT(COOLANT TEMP IND)
616-BU
FF
EE
D
CC
M
L
K
128-8940 E-1 (NOTE C)
134-3326 B-2
153-2577 B-3 (NOTE C)
116-0243 E-1
143-1567 C-2
153-2576 B-3
J 5I-8217 D-2
H
G
F
HH
134-3322 F-7
134-3321 F-7
153-2583 F-7
134-3318 F-7
153-2582 F-7
134-3320 F-7
NOTE A: NORMALLY OPEN BEFORE REFRIGERANT CHARGE.
E
D
C
B
143-1575 F-7
134-3280 C-5
143-1568 C-5
134-3324 H-4
134-3323 E-4
143-1574 F-7
145-0546 E-8
153-2578 A-6
BB
H740-OR
H741-WH
H742-PU-18
H743-YL-18
H744-BU-18
H745-BR-18
200-BK-18
607-PK-18
ATCH
BOOM LAMP(RH)
143-1617
HORN
096-1491
H
DD
134-3306 D-9
134-3308 D-9
134-3307 D-9
153-2567 D-9
403-GN-18
G
9 8 7 6 5 4 3 2
1
9 8 7 6 5 4 3 2
1
D
E
F
G
H
J
C
B
A
D
E
F
G
H
J
C
B
A
THIS SCHEMATIC IS FOR THE 307B EXCAVATOR.
(134-3270 HE02)
UNLESS OTHERWISE SPECIFIED ALL WIRE IS 16 GAUGE.
TO MACHINE STRUCTURE
CONN 68
CONN 38
CONN 39
CONN 40
CONN 37
CONN 36
CONN 34
CONN 33
CONN 35
CONN 26
CONN 25
CONN 69
CONN 43
CONN 41
CONN 42
CONN 47
CONN 48
CONN 49
CONN 44
CONN 45
CONN 46
CONN 51
CONN 67
CONN 52
CONN 53
CONN 54 CONN 66
CONN 31
CONN 32
CONN 3
CONN 50
CONN 59
CONN 58
CONN 70
CONN 56
CONN 55
CONN 30
CONN 28
CONN 7 CONN 6 CONN 5
CONN 4
CONN 2
CONN 29
CONN 60
CONN 61
CONN 62
CONN 61
CONN 62
CONN 64
CONN 63
CONN 65
CONN 1
CONN 27
CONN 23 CONN 22
CONN 21
CONN 20 CONN 19
CONN 24
CONN 17
CONN 16
CONN 15
CONN 14
CONN 18
CONN 13
CONN 12
CONN 11
CONN 10
CONN 9
CONN 8
CONN 57
E30617