307B SWING BOOM EXCAVATOR ELECTRICAL SYSTEM

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.
RENR3132
August 1998
307B Swing Boom Excavator
Electrical System
7DZ1-UP
©
1998 Caterpillar
All Rights Reserved
Printed in U.S.A.
6KZ1-UP
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)
103 RD Aux Ckt 501 GN Wiper - Front (Low)
105 RD Key Sw 506 PU Washer - Front
107 RD Engine Shutdown 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 Rly Output 512 GN Radio Speaker - Right (Common)
113 OR Opr Monitor Panel B+ Switched 513 OR A/C Compressor/Refrigerant Press 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 Backup 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 BR Starter Relay No. 1 Output 799 WH Sensor Power
306 GN Starter Relay Coil B786 BU Low Idle SW
307 OR Key SW To Neutral Start SW H740 OR HEX Governor Motor +
310 PU Start Aid SW To Start Aid Sol H741 WH HEX Governor 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)
Resistor, Sender and Solenoid Specifications
Part No. Component Description Resistance (Ohms)¹
121-1491 Solenoid- Hydraulic Lock 32.0 ± 3.2
¹ At room temperature unless otherwise noted.
1
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
21
24
25
26
4
2
3
1
7
8
9
10
11
12
13
14
15
16
17
18
19
24
21
20
25
26
3
4
5
8
9
12
14
15
13
16
2
20
21
22
23
24
25
37
38
39
40
41
43
44
47
48
49
50
60
67
68
57
10
A
3
4
5
67
8
9
68
12
14
15
13
16
B
C
D
E
2
20
21
22
23
24
25
37
38
57
G
39
40
41
43
44
47
48
49
50
60
14
13
5
6
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
61
56
59
53
62
46
26
52
63
54
18
42
Area D
Area G
52
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
Component
Location
Machine
Location
Component
Schematic
Location
Machine
Location
Actuator - Governor E-2 1C Resistor - Monitor C-2 36B
Alarm - Travel A-6 2 Sender - Engine Coolant Temp B-B 37
Alternator B-8 3 Sender - Hydraulic Oil Temp B-6 3B
Antenna H-5 4 Sensor - Fuel Level A-6 39
Battery D-9 5 Solenoid - A/C Comp Clutch C-B 40
Block - Terminal F-7 6E Solenoid - Engine Shutdown A-B 41
Breaker - Alternator F-9 7E Solenoid - Hydraulic Lock G-3 42G
Cable - Antenna J-4 B Solenoid - Travel Speed A-6 43
Controller - Governor D-2 9 Solenoid - Engine Pump Temp A-6 44
Converter - 12V 5A C-2 10B Speaker C-2 45B
Fuse-Block J-7,8,9 11F Switch - Air Bleed Pump H-2 46D
Horn B-2 12 Switch - Engine Coolant Temp B-B 47
Lamp - Boom B-2 13 Switch - Disconnect D-9 4B
Lamp - Cab E-1 14 Switch - Engine Oil Press B-B 49
Lamp - Chassis A-3 15 Switch - Governor Press D-7 50
Lamp-Dome B-2 16 Switch-Horn G-1 51D
Lighter- Cigar C-2 17B Switch - Light (Boom/Chassis Lamp) J-1 52D
Meter - Service J-2 18D Switch - Light (Cab Lamp) J-2 530
Monitor D-5 19C Switch - Neutral Start J-1 54D
Motor - Starter A-B 20 Switch - One Touch Low Idle F-2 55C
Motor - Washer E-9 21 Switch - Power Mode H-2 56D
Motor - Wiper F-1 22 Switch - Refrigerant Low Press D-9 57
Plug - Glow B-8 23 Switch - Starter E-2 5BC
Pump - Auto Lubrication D-9 24 Switch - Travel Alarm Cancel H-2 59D
Pump - Fuel A-5 25 Switch - Travel Press D-7 60
Radio J-2 26D Switch - Travel Speed H-1 61D
Relay - Boom/Chassis Lamp H-9 27F Switch - Washer H-1 62D
Relay - Cab Lamp H-8 2BF Switch - Wiper H-1 63D
Relay - Heater G-6 29E Timer - Engine Shutdown H-5 64E
Relay - Horn H-7 30F Timer - Hydraulic Lock H-5 65E
Relay - Neutral Start Lock H-7 31F Timer - Travel Alarm J-5 66E
Relay - Start Control H-5 32E Unit - Air Conditioner D-6 67
Relay - Start H-5 33E Unit - Heater D-6 6B
Relay - Washer/Cigar H-8 34E Converter J-5 69E
Relay-Wiper H-9 35F 12V Socket C-3 70B
3
2
1
28
31
30
34
58
19
55
11
1
27
35
Area F
Area C
Harness Connector Location Chart
Connector
Machine
Location
Harness And/Or
Components
Schematic
Location
Connector
Machine
Location
Harness And/Or
Components
Schematic
Location
20 Contacts
CONN3
E - 134 - 3323
Monitor
C-5
CONN10
F - 134 - 3324
Wiper Switch
H-1
CONN5
C - 153 - 2615
E - 134 - 3323
E-4
CONN11
F - 134 - 3324
Washer Switch
H-1
CONN6
C - 153 - 2615
E - 134 - 3323
E-4
CONN12
F - 134 - 3324
Travel Speed Switch
H-1
CONN19
C - 153 - 2615
F - 134 - 3324
H-4
CONN14
F - 134 - 3324
Cab Light Switch
J-2
CONN20
C - 153 - 2615
F - 134 - 3324
H-4
CONN15
F - 134 - 3324
Air Bleed Pump Switch
H-2
CONN25
F - 134 - 3324
A/C Unit
D-6
CONN16
F - 134 - 3324
Travel Alarm Cancel Switch
H-2
CONN28
B - 143 - 1576
C - 152 - 2615
E-5
CONN17
F - 134 - 3324
Power Mode Switch
H-2
CONN32
C - 153 - 2615
G - 143 - 1S68
C-5
CONN38
D - 153 - 2614
Engine Shutdown Timer
H-6
CONN34
C - 153 - 2615
D - 153 - 2614
E-8
CONN58
G - 143 - 1568
Resistor
C-3
CONN35
C - 153 - 2615
D - 153 - 2614
E-9
CONN65
J - 51 - 8217
Wiper Motor
F-2
CONN18
F - 134 - 3324
Radio-AM/FM
J-2
CONN68
D - 153 - 2614
Travel Alarm Timer
J-6
CONN24
F - 134 - 3324
Air Conditioner Switch Panel
J-4
CONN75
C - 153 - 2615
D - 153 - 2614
E-8
CONN29
C - 153 - 2615
Governor Controller
D-2
CONN8
F - 134 - 3324
Neutral Start Limit Switch
J-1
CONN33
A - 153 - 2612
C - 153 - 2615
E-8
CONN26
C - 153 - 2615
F - 134 - 3324
D-6
CONN37
A - 153 - 2612
D - 153 - 2614
F-7
CONN55
G-143 - 1568
Speaker
C-2
CONN2
E - 134 - 3323
Governor Actuator
E-2
CONN59
G - 143 - 1568
Speaker
C-2
CONN4
C - 153 - 2615
E - 134 - 3323
E-3
CONN7
C - 153 - 2615
E - 134 - 3323
E-5
CONN30
C - 153 - 2615
Governor Controller
D-2
CONN21
F - 134 - 3324
C - 153 - 2615
H-4
CONN31
C - 153 - 2615
H - 143 - 1S69
C-5
CONN22
F - 134 - 3324
C - 153 - 2615
H-5
CONN39
D - 153 - 2614
Hyd Lock Timer
H-6
CONN23
F - 134 - 3324
C - 153 - 261S
H-5
CONN40
D - 153 - 2614
Start Control Relay
H-6
CONN27
C - 1S3 - 2615
Hyd Lock Solenoid
G-3
CONN60
H - 143 - 1569
J - 51 - 8217
D-2
CONN36
C - 153 - 2615
D - 153 - 2614
E-9
CONN70
L - 143 - 1567
12V 5A Converter
C-2
CONN41
A - 153 - 2612
Auto Lubrication Pump
D-9
5 Contacts
CONN9
F - 134 - 3324
Light Switch
J-1
CONN42
A - 153 - 2612
Auto Refrigerant Low Press Switch
D-9
5 Contacts
4 Contacts
3 Contacts
2 Contacts
12 Contacts.
9 Contacts
8 Contacts
6 Contacts
Harness Connector Location Chart
Connector
Machine
Location
Harness And/Or
Components
Schematic
Location
Connector
Machine
Location
Harness And/Or
Components
Schematic
Location
CONN43
A - 15 - 2612
Gov Press Switch
D-7
CONN13
F - 134 - 3324
Horn Switch
G-1
CONN45
A - 153 - 2612
Alternator
B-8
CONN46
A - 153 - 2612
Engine Oil Press Switch
B-8
CONN47
A - 153 - 2612
Air Conditioner Clutch Solenoid
C-8
CONN48
A - 153 - 2612
Coolant Temp Sender
B-8
CONN52
B - 143 - 1576
Engine/pump RControl Solenoid
A-6
CONN49
A - 153 - 2612
Coolant Temp Switch
B-8
CONN53
B - 143 - 1576
Travel Speed Solenoid
A-6
CONN50
B - 143 - 1576
K - 143 - 1571
B-3
CONN54
B - 143 - 1576
Fuel Sensor
A-6
CONN51
B - 143 - 1576
Hyd Oil Temp Sender
A-6
CONN57
G - 143 - 1568
L - 143 - 1567
C-3
CONN56
G - 143 - 1568
Cigar Lighter
C-2
CONN67
B - 143 - 1576
Travel Alarm
A-6
CONN61
H - 143 - 1569
M - 116 - 0243
E-1
CONN69
A - 153 - 2612
Travel Press Switch
D-7
CONN62
H - 143 - 1569
M - 116 - 0243
E-1
1 Contacts
CONN44
A - 153 - 2612
Alternator
C-8
CONN66
B - 143 - 1576
Fuel Pump
A-5
Bullet
Terminal
CONN1
E - 134 - 3323
One Touch Low Idle Switch
F-2
CONN74
L - 143 - 1567
12V Socket
C-2
Bullet
Terminal
2 Contacts
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
105-9344 Refrigerant Pressure
200 ± 20 to 2250 kPa ¹
(29 ± 2.9 to 326.3 psi)
—
—
Normally Open ²
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
¹ A hysteresis band exists: with increasing pressure the closed condition can be maintained up to 2800 kpa (405 psi), with decreasing pressure the closed
condition can be maintained down to 170 kpa (25psi).
² Contact postion at the contacts of the harness connector.
Area A
Area E
Area B
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
70
45
45
10
36
17
5
66
66
F
33
64
29
32
7
65
Related Electrical Service Manuals
Form Number
Electrical and Electronic System RENR2978
Title
1
C
4
G
3
G
10
G
9
G
17
2
G
1
A
9
E
10
E
9
D
10
D
19
8
E
7
E
2
C
1
G
18
2
A
3
E
6
E
24
6
B
1
D
8
13
9
4
2
1
3
B
3
7
14
3
C
2
D
3
D
4
D
6
D
7
D
8
D
5
D
3
E
5
B
20
4
E
12
E
11
DE
7
G
4
B
1
B
5
G
12
G
11
G
8
G
6
G
11
E
16
15
12
D
11
10
12
26
6
2
B
21
25
5
7
B
C
ATCH
CAB LAMP
143-1617
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-181
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
200-BK
200-BK-18
G
113-OR-18
G480-GN-18
G482-PK-18
G481-WH-18
3
1
2
4
RESISTOR
140-0924
512-GN-18
511-BR-18
G481-WH-18
G482-PK-18
G480-GN-18
113-OR-18
200-BK
615-YL
129-BU
508-PU-18
509-WH-18
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
L19
L22
L23
L17
615-YL
786-GN-18
L17
L20
L20
L20
L19
L18
L18
L14
L10
L15
L16
L15
L17
L14
L6
L7
L15
L16
L16
L8
L7
L6
L13
L13
L9
L13
L13
200-BK-18
500-BR
129-BU
D
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
L10
L10
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
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-1810A
10A
L8
L8
L8
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
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
L4
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 STATIONOPERATOR STATION
OPERATOR STATION OPERATOR STATION
RELAY PANEL
RELAY PANEL
RELAY PANELRELAY 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-18
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
7
8
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
EEGG
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
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
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
BBCC
CHASSIS
109-RD-6
101-RD-6
190-PK-18
506-PU-18
ALT BREAKER
9S-0174
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
139-7840
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
T
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
PLATFORMCHASSIS
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
DD
L17
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
7
8
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 MODEL X322.
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
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
G
ATCH
AM RADIO
136-4006
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
L12
L11
L11
L11
L12
406-PU-18
441-OR-18
L11
L5
321-BR-18
L5
L3
L3
323-WH-18
L
L
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
153-2444
153-2445 (NOTE C)
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
4
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
200-BK
T
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-18
L9
L9
323-WH-18
321-BR-18321-BR-18
K
323-WH-18
200-BK-18
D
D
L8
L7
L7
L6
L6
CAB
200-BK-18
200-BK
200-BK-18
200-BK-18
129-BU-18
200-BK-18
321-BR-18
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 AFULLY
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
KB
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
L#
511-BR-18
512-GN-18
CIRCUIT GROUPING
DESIGNATION
IDENT PART NO. LOC
HARNESS AS.
ATCH
BOOM LAMP(LH)
143-1617
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
200-BK
615-YL
200-BK
4
6
2
1
3
5
616-BU
200-BK
616-BU
12V OUT(HYD OIL TEMP IND)
200-BK
CHASSIS LAMP
143-1617
K
200-BK
B
12V OUT(COOLANT TEMP IND)
616-BU
FF
EE
D
CC
M
L
K
J
H
G
F
HH
NOTE A: NORMALLY OPEN BEFORE REFRIGERANT CHARGE.
E
D
C
B
F-7
E-1
C-2
B-3
D-2
C-5
C-5
H-4
E-4
F-7
E-8
A-6
153-2612
116-0243
143-1567
143-1571
5I-8217
143-1569
143-1568
134-3324
134-3323
153-2614
153-2615
143-1576
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
F-7
F-7
F-7
D-9
F-7
F-7
D-9
F-7
D-9
D-9
134-3322
134-3321
153-2583
134-3306
134-3318
153-2582
143-1579
134-3320
134-3307
153-2567
403-GN-18
G
THIS SCHEMATIC IS FOR THE 307B-SWING BOOM EXCAVATOR.
(143-1558 HE03)
UNLESS OTHERWISE SPECIFIED ALL WIRE IS 16 GAUGE.
TO MACHINE STRUCTURE
GOV PRESS. SW
106-0179
CONN 8
CONN 9
CONN 10
CONN 11
CONN 12
CONN 17
CONN 16
CONN 15
CONN 14
CONN 18
CONN 13
CONN 65
CONN 61
CONN 1
CONN 62
CONN 60
CONN 2
CONN 29
CONN 30
CONN 55
CONN 56
CONN 74
CONN 70
CONN 58
CONN 59
CONN 50
CONN 57
CONN 31
CONN 32
CONN 3
CONN 28
CONN 7 CONN 6 CONN 5
CONN 4
CONN 27
CONN 19
CONN 20
CONN 21CONN 22
CONN 23
CONN 24
CONN 68
CONN 38
CONN 39
CONN 40
CONN 37
CONN 36 CONN 35 CONN 34 CONN 75
CONN 33
CONN 69
CONN 43
CONN 26
CONN 25
CONN 41
CONN 42
CONN 47
CONN 48
CONN 44
CONN 45
CONN 46
CONN 49
E70720
CONN 51
CONN 67
CONN 52
CONN 53
CONN 54
CONN 66
L14
L4
D
E
F
C
B
A
9 8 7 6 5 4 3 2
1
D
E
F
GG
HH
II
C
B
A
9 8 7 6 5 4 3 2
1
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.
MONITOR CIRCUIT. (EMS)
PANEL LAMP CIRCUIT.
WASHER/WIPER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
HEATER CIRCUIT.
CONTROL CIRCUIT.
ALL DASHED LINES ARE ATTACHMENTS.