
SENR9310
March 1996
307 Excavator
Electrical System
2WM500-UP
©
1996 Caterpillar
All Rights Reserved
Printed in U.S.A.
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
Off Machine Switch Specification
Part No. Function Actuate Deactuate Contact Position
3T-4418
Engine Oil Pressure
93 ± 21 kPa
(13.5 ± 3.0 psi)
69 ± 21 kPa
(10.0 ± 3.0 psi)
Normally Open
8N-1693
Start Aid Temperature
37.8 ± 2.8°C
(100.0 ± 5.0°F)
26.7°C MIN
(80°F MIN)
Normally Closed
102-8041
Travel Pressure
Pressure (Controller)
1225 ± 343 kPa
(178 ± 50 psi)
735 kPa MIN
(107 psi MIN)
Normally Open
108-3190
Coolant Temperature
107.0 ± 1.5°C MIN
(224.60 ± 2.7°F MIN)
100°C MIN
(212°F MIN)
A-B Normally Open
B-C Normally Closed
114-5334
Refrigerant Pressure
275 to 1750 kPa ¹
(40 to 255 psi)
-
-
Normally Open ²
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.
Connector Location¹
Connector
Number
Schematic
Location
Machine
Location
CONN 1 G-1 5
CONN 2 G-2 1C
CONN 3 C-3 27
CONN 4 C-3 27
CONN 5 J-3 35
CONN 6 D-4 16
CONN 7 D-4 16
CONN 8 D-4 16
CONN 9 B-5 24
CONN 10 B-5 24
CONN 11 E-5 1B
CONN 12 G-5 17
CONN 13 H-5 17
CONN 14 H-5 17
CONN 15 H-5 17
CONN 16 H-5 17
CONN 17 J-5 17
CONN 18 G-8 4C
CONN 19 G-8 3C
CONN 20 G-8 2C
CONN 21 G-8 20C
CONN 22 E-8 7B
CONN 23 E-8 5B
CONN 24 E-8 6B
CONN 25 D-8 10A
CONN 26 D-9 17C
¹The connectors shown in this chart are for harness to harness connectors.
Connectors that join a harness to a component are generally located at or near the
component. See the Component Location Chart.
Related Service Manuals
Title Form No.
Alternator: (109-2362) SENR3685
Electronic Monitoring System (EMS) SENR2945
Starting And Charging Systems SENR9207
Starting Motor: (109-2361) SENR3550
Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
Actuator - Engine Governor F-5 1B Resistor B-9 21
Alarm - Action F-2 2A Resistor F-6 8B
Alarm - Travel B-6 3 Resistor - Air Heater C-8 21
Alternator B-8 4 Sender - Engine Coolant Temp B-9 36
Antenna E-9 5 Sender - Hydraulic Oil Temp C-6 37
Assembly - Diode B-6 37 Sensor - Fuel Level A-6 38
Batteries A-3 6 Solenoid - A/C Compressor Clutch A-8 39
Breaker - Alternator F-7 7C Solenoid - Blade C-6 40D
Controller F-5 8B Solenoid - Engine Pump Control B-6 42D
Converter D-9 70C Solenoid - Engine Shutdown B-9 41
Fuse Block J-7,8,9 9F Solenoid - Trenching A-6 44D
Heater - Air C-8 21 Switch - Cab Lamp J-2 52C
Horn B-2 10 Switch - Coolant Temperature B-8 47
Lamp - Boom C-2 11 Switch - Disconnect A-3 71
Lamp - Cab G-1,H-1 12 Switch - Engine Oil Pressure B-9 48
Lamp - Chassis B-3 13 Switch - Horn G-2 50
Lamp - Dome D-5 14 Switch - Key Start F-4 59B
Lighter - Cigar F-2 15A Switch - Lamp(Boom/Chassis) E-1 51E
Meter - Service F-2 16A Switch - Low Idle F-4 54
Monitor F-1 17A Switch - Neutral Start G-2 53
Motor - Starter A-8 18 Switch - Power Mode Control E-2 55E
Motor - Washer C-6 19 Switch - Preheat/Start Aid F-4 B
Motor - Wiper J-1 20 Switch - Pressure (Controller) B-6 56
Relay - Alternator H-7 72F Switch - Refrigerant Low Press B-8 58
Relay - A/C and Heater H-8 25A Switch - Start Aid Temp B-8 4
Relay - Blade Lock H-9 26F Switch - Travel Alarm Cancel J-2 60C
Relay - Cab Lamp H-8 27F Switch - Travel Alarm Timer E-9 67C
Relay - Chassis/Boom Lamp H-9 28F Switch - Travel Pressure B-6 61
Relay - Governor H-8 29F Switch - Washer D-1 63E
Relay - Horn H-7 31F Switch - Wiper E-1 64E
Relay - Neutral Start H-8 32F Switch - Work Mode Control D-2 65E
Relay - Start F-7 34C Unit - Air Conditioner F-8 68
Relay - Wiper H-9 35F Unit - Heater F-8 69
Area A = Inside of monitor panel.
Area B = Inside of R.H. console.
Area C = Inside of L.H. console.
Area D = Around pilot manifold.
Area E = Monitor switch.
Area F = Inside of fuse relay box.
RESISTOR AND SOLENOID SPECIFICATIONS
Component Part No. Resistance (Ohms)¹
Resistor - Alternator 102-8015 41.00± 2.05
Resistor - Engine Shutdown 5L-2854 4.0 ± 0.2
Solenoid - A/C Clutch 101-1759 14.4± 0.6
Solenoid - Comb/Single 6T-5859 33.7± 1.0
Solenoid - Start Aid 3T-9493 1.5
¹ At room temperature.
1
5
7
16
17
18
19
20
21
22
23
24
25
27
29
34
35
8
1
34
5
7
8
16
17
18
19
20
21
22
23
24
25
27
29
35
3
4
5
6
68
10
11
12
14
13
58
18
19
20
21
22
37
36
38
39
41
47
48
50
61
69
53
54
71
56
A
3
4
6
58
10
11
12
14
61
13
B
C
D
71
18
19
20
21
22
37
68
36
38
39
41
47
48
69
50
53
54
56
12
11
Machine Harness Connector And Component Locations
7
8
13
14
17 18
19
1
2
3
4
6
10
11
20
1
2
3
4
60
9
64
63
49
72
25
26
27
28
29
30
31
32
35
70
34
7
F
40
67
42
43
44
51
52
62
55
65
Area C
Area F
Area E
Area D
Area A
1
2
3
4
5
6
7
8
9
10
11
12
10
1
2
3
4
5
6
7
8
9
Area B
8
11
15
16
E
1
2
33
46
66
59

615-YL
615-YL
501-GN
786-GN-18
200-BK
118-GY
122-BU-18
200-BK-18
799-WH-18
120-YL-18
200-BK-18
200-BK-18
190-PK
312-PK
B
K
C
K
L12
616-BU-18 616-BU-18403-GN-18
PANEL FUSES
L15
L15
S
S
A
1
2
E
B
B
122-BU-18
200-BK-18
2
1
LL
A
A
A
A
B
A
ATCH CONTROL AR SINGLE 128-7860
A
A
LL C-8131-1522
KK 131-1744 B-8
JJ F-7129-7069
S 131-1406 B-5
L15
CD
D C
6
7
8
9
5
4
3
2
1
10
START RELAY
3E-0075
ALT BREAKER
9S-0174
A
6
7
8
9
5
4
3
2
1
10
10
1
2
3
4
5
9
8
7
6
D813-OR-18
B786-BU-18
K
K
PLATFORM
200-BK-18
200-BK-18
200-BK-18
200-BK
200-BK
109-OR-10304-WH-10
124-GN
200-BK
A
JJ
817-WH-18
799-WH-18
519-PK
309-GY-18
321-BR-18
200-BK-18
D815-PU-18
309-GY-18
121-YL-18
D813-OR-18
B786-BU-18
60A
D814-GY-18
190-PK
200-BK
200-BK-18
309-GY-18
B786-BU-18
D813-OR-18
D814-GY-18
405-GY-18
406-PU-18
441-OR-18
309-GY-18
321-BR-18
799-WH-18
103-YL-18
817-WH-18
506-PU-18
1
519-PK
2
312-PK-18
121-YL-18
A
118-GY
500-BR
792-OR-18
791-PK-18
501-GN
124-GN
616-BU-18
108-BU-18
142-BU-18
113-OR-18
403-GN-18
129-BU-18
190-PK
615-YL
STARTING
K
C
309-GY-18
308-YL
RD
BK
YL
WH
OR-18
616-BU
322-GY-18
607-PK-18
200-BK-18
952-OR-18
200-BK-18
200-BK
190-PK
D814-GY-18
D815-PU-18
B786-BU-18
D813-OR-18
124-GN
799-WH-18
FF
309-GY-18
121-YL-18
DISCONNECT
SW
7N-0718
200-BK
A
310-PU-18
311-WH-18
ATCH START AID SOLENOID
3T-9493
308-YL
519-PK
321-BR-18
309-GY-18
786-GN-18
H
312-PK
308-YL
447-PK-18
E
D
D
D
DD
D
D
D
D
D
K
H
K
1
2
AA
J
A
2
C
C
1
C
K
WIRE AS.
A
A
D
310-PU-18
D816-WH-18
311-WH-18
B965-GY-18
200-BK
403-GN-18
135-BU
10
1
2
3
4
5
9
8
7
6
K
615-YL
190-PK
129-BU-18
799-WH-18
113-OR-18
142-BU-18
310-PU
108-BU-18
RESISTOR
7W-1251
616-BU-18
312-PK
124-GN
501-GN
791-PK-18
792-OR-18
500-BR
118-GY
121-YL-18
817-WH-18
310-PU
330-YL-18
616-BU-18
506-PU-18
519-PK
103-YL-18
403-GN-18
309-GY-18
441-OR-18
406-PU-18
405-GY-18
D814-GY-18
AIR HEATER
035-8059
ATCH CONTROL AR
COMB. 128-7861
SINGL.128-7860
SWITCH
113-2531
DIODE AS.
131-2084
180-GN
AUX
792-OR-18
L3
2
1
ATCH
CAB LAMP
107-6689
615-YL
2
200-BK
D814-GY-18
2
405-GY-18
406-PU-18
441-OR-18
309-GY-18
403-GN-18
817-WH-18
103-YL-18
327-PK-18
506-PU-18
1
LL
330-YL-18
200-BK-18
312-PK
121-YL-18
118-GY
500-BR
792-OR-18
791-PK-18
501-GN
124-GN
607-PK-18
616-BU
112-PU-14
112-PU
105-BR-14
108-BU-18
200-BK-18
142-BU-18
113-OR-18
322-GY-18
200-BK-18
129-BU-18
A
615-YL
D816-WH-18
129-BU-18
330-YL-18
320-OR-18
322-GY-18
113-OR-18
142-BU-18
200-BK-18
108-BU-18
105-BR-14
112-PU
112-PU-14
616-BU
607-PK-18
124-GN
501-GN
791-PK-18
792-OR-18
500-BR
118-GY
121-YL-18
C
151-GN-18
200-BK-18
10
1
2
3
4
817-WH-18
KK
A
127-OR
T
BK-18
817-WH-18
200-BK-18
519-PK
513-OR
ATCH REFRIGERANT SW
114-5334
K
K
151-GN-18
952-OR-18
154-WH-18
1
2
3
4
442-GY-18
228-BK-18
106-0027 J-2T
952-OR-18
607-PK-18
6
616-BU
115-PK
151-GN-18
200-BK-18
200-BK-18
B786-BU-18
120-YL-18
791-PK-18
786-GN-18
616-BU-18
799-WH-18
200-BK-18
200-BK-18
791-PK-18
122-BU-18
5
108-BU-18
506-PU-18
7
8
5
312-PK
500-BR
501-GN
4
3
320-OR-18
2
1
322-GY-18
114-GN-18
114-GN-18
312-PK
10
5
151-GN-18
101-RD-14
1
109-OR-14
101-RD-14
C
D813-OR-18
154-WH-18
952-OR-18
101-RD-14
506-PU-18
200-BK-18
519-PK
109-OR-6
6
108-BU-18
101-RD-6
103-YL-18
327-PK-18
103-YL-18
817-WH-18
403-GN-18
309-GY-18
441-OR-18
406-PU-18
405-GY-18
952-OR-18
9
151-GN-18
154-WH-18
ATCH
TRAVEL ALARM TIMER
9G-7410
101-RD-6
121-YL-18
101-RD-14
D814-GY-18
118-GY
118-GY
F
500-BR
1
118-GY
501-GN
2
154-WH-18
105-BR-14
112-PU-14
200-BK-18
112-PU-14
9
112-PU-14
124-GN
200-BK-18
127-OR
D815-PU-18
410-WH-18
201-BK-18
124-GN
616-BU-18
442-GY-18
1
2
ATCH
CAB
LAMP RELAY
7Y-5490
200-BK-18
210-BK
200-BK
200-BK
200-BK
CAB
BU/WH
8
2
1
5
4
3
8
200-BK
118-GY
501-GN
9
8
7
6 5
4
3 2
1
9
8
7
6 5
4
3 2
1
154-WH-18
NOTE C: USE WITH AID GP. ETHER STARTING
NOTE B: USE WITH OFFSET BOOM.
2
UNLESS OTHERWISE SPECIFIED ALL WIRE IS 16 GAGE.
COMPONENTS ARE SHOWN INSTALLED ON A FULLY
OPERABLE MACHINE WITH THE KEY AND ENGINE OFF.
DD 121-9738 A-9
CC A-3111-4740
BB 096-6449 A-3
T
H
574-WH-18
H
500-BR
BU
BK
YL
RD
7
200-BK-18
BK
200-BK-18
615-YL
AA 117-0416 A-3
RD
CABLE AS.
120-YL-18
122-BU-18
M 131-3395 C-2
L C-2131-3383
K F-4129-3824
J J-8126-2200
122-BU
H J-2129-3832
200-BK-18
G H-27Y-3868
F 128-4032 C-2
E 130-7339 G-1
D 129-3240 D-8
C 129-5032 D-4
A 130-8349 A-8
3
2
1
OPERATOR STATION
RD-18
BK-18
2
1
OPERATOR STATIONOPERATOR STATION
201-BK-18
M
122-BU
CC
CCBBAA
B
L
N (NOTE B)B
FOR ATCH RADIO
G
G
J
B
B
B
S
B
S
B
A
A
A
AA
DD
GROUND
+12 VOLT
+ BATTERY
GY
2
ATCH
RADIO SW
7X-6386
200-BK
1
L13
PU
BR
RED
WHITE
406-PU-18
200-BK-18
A
ORANGE
YELLOW
PINK
ABBREV COLOR
BLACK
GRAY
PURPLE
BROWN
DESCRIPTIONSYMBOL
CONNECTOR
GROUND
615-YL
3
1
H
2
3
200-BK
2
7
OPERATOR STATION
ELECTRICAL CONNECTION
6
INTERNAL ELECTRICAL
CONNECTION TO SURFACE
OF COMPONENT
2
BLADE, SPADE, RING,
OR SCREW TERMINAL
1
5
BK
PK
200-BK
799-WH-18
C
799-WH-18
C
C
C
C
A
A
A
142-BU-18
4
320-OR-18
3
190-PK
10
YL
9
3
799-WH-18
8
200-BK-18
7
6
5
200-BK-18
786-GN-18
4
3
2
103-YL-18 1
442-GY-18
447-PK-18
B965-GY-18
RESISTOR
102-8015
D816-WH-18 607-PK-18
321-BR-18
322-GY-18
312-PK
D813-OR-18
OR
WH
RD
GN
BU
GREEN
BLUE
CIRCUIT CONNECTED
CIRCUIT NOT CONNECTED
ATCH WIRE, CABLE,
COMPONENT
ATCH
LIGHT SW
(CAB LAMP)
7X-6386
309-GY-18
374-PK-18
200-BK-18
122-BU-18
309-GY-18
113-OR-18
129-BU-18
5
B786-BU-18
4
309-GY-18
791-PK-18
3
2
101-RD-6
L
103-YL-18
#
6
129-BU-181
CIRCUIT GROUPING
DESIGNATION
327-PK-18
307-OR-18
IDENT
112-PU-14
PART NO.
1
6
2
115-PK
2
1
5
2
COOLANT TEMP SW
108-3190
ENG OIL PRESSURE SW
3T-4418
RD
3
127-OR
1 BK
441-OR-18
200-BK-18
4
D816-WH-18
5
6
105-BR-14
7
200-BK-18
H
B965-GY-18
7
519-PK
101-RD-6
304-WH-10
200-BK
513-OR
513-OR
1
2
330-YL-18
8
7
6
5
4
D815-PU-18
304-WH-10
CANCEL
+ BATTERY
ALARM
PRESS.
GND
3
2
1
D816-WH-18
306-GN-18
B965-GY-18
330-YL-18
447-PK-18
442-GY-18
405-GY-18
1
2
616-BU
615-YL
129-BU-18
403-GN-18
113-OR-18
142-BU-18
108-BU-18
616-BU-18
501-GN
791-PK-18
792-OR-18
500-BR
118-GY
312-PK-18
112-PU-18
200-BK
OPERATOR STATION
111-YL
615-YL
LOC
HARNESS AS.
1
786-GN-18
322-GY-18
121-YL-18
607-PK-18
447-PK-18
200-BK-18
442-GY-18
112-PU-18
118-GY
L15
506-PU-18
103-YL-18
441-OR-18
406-PU-18
405-GY-18
5
P G-1117-7028
574-WH-18
374-PK-18
WH
307-OR-18
500-BR
574-WH-18
792-OR-18
MOT BAT
KK
S
791-PK-18
501-GN
124-GN
607-PK-18
616-BU
112-PU-14
112-PU
105-BR-14
CHASSIS
108-BU-18
200-BK-18
190-PK
200-BK-6
142-BU-18
113-OR-18
120-YL-18
322-GY-18
320-OR-18
309-GY-18
ENG
MOTOR
B-
B+
W
D
ALT
615-YL
109-OR-6
ALTERNATOR
109-2362
403-GN-18
403-GN-18
615-YL
STARTER
109-2361
BLADE LOCK
RELAY
7Y-5490
NEUTRAL
START
RELAY
7Y-5490
112-PU-18
320-OR-18
322-GY-18
200-BK
330-YL-18
616-BU
1129-BU-18
120-YL-18
2
3
113-OR-18
142-BU-18
4
10A
10A
5
6
7
ILLUMI4
G
519-PK
CONTROLLER
102-8019
KNOB
7Y-9390
ENG GOV ACTR
126-2944
KEY SW
7Y-3918
OFF
PREHEATBR
R1
B
C
R2
ACC
START
ON
COOLANT TEMP SENDER
HYD OIL TEMP SENDER
ONE TOUCH LOW IDLE
2
3
MONITOR
121-1116
6
7
9
10
11
5
7
8
190-PK
9
10A
15A
110-GN
200-BK-18
5
108-BU-18
CHASSIS/BOOM LAMP
WIPER
306-GN-18
4
3
2
ATCH
BOOM LAMP
107-6689
321-BR-18
L10
312-PK-18
L11
1
BK-0
10
118-GY
112-PU-18
CIGAR
LIGHTER
9W-0335
307-OR-18
BK-0BK-0RD-0
574-WH-18
L4
L9
L9
C
112-PU
GOV ACTR
CAB LAMP
374-PK-18
B 129-5301 D-4
E
L11
122-BU-18
322-GY-18
330-YL-18
447-PK-18
S
952-OR-18
953-GY-18
200-BK-18
B965-GY-18
200-BK-18
200-BK-18
N 131-3403 C-2
A
105-BR-14
10A
15A
115-PK
L2
109-OR-14
109-OR-14
574-WH-18
10A
A/C HEATER
WASHER
112-PU
15A
112-PU-14
114-GN-18
616-BU
20A
15A
306-GN-18
190-PK
103-YL-18
TRAVEL ALARM
2
101-RD-14
1
110-GN
200-BK-18
607-PK-18
112-PU-18
GOV RELAY
7Y-5490
124-GN
501-GN
L1
L1
L2
M
Y (NOTE B)
101-RD-14
101-RD-14
519-PK
L10
L12
791-PK-18
L6
RADIO
120-YL-18
BK1
RD2
BATTERY
3T-5760
9X-3404 (NOTE C)
4
1
2
616-BU
200-BK
A
J
OR
792-OR-18
410-WH-18
500-BR
ENG
SHUTDOWN SOL
101-3897
151-GN-18
154-WH-18
200-BK
307-OR-18
616-BU
799-WH-18
374-PK-18
T
574-WH-18
306-GN-18
ATCH
TRAVEL ALARM
CANCEL SW
7X-6387
200-BK-18
2
1
101-RD-6
109-OR-6
304-WH-10
200-BK-18
118-GY
101-RD-6
109-OR-14
109-OR-6
109-OR-14
HORN
121-YL-18
112-PU-18
200-BK-18
304-WH-10
DOME LAMP
121-YL-18
786-GN-18
BK
BK
RD
101-RD-14
1
2
BK/PK
101-RD-14
3E-6328
L5
10A
10A
7
6
112-PU
129-BU-18
441-OR-18
5
4
3
2
122-BU-18
200-BK-18
200-BK-18
B965-GY-18
142-BU-18
109-OR-14
109-OR-14
200-BK-18
200-BK-18
616-BU-18
200-BK
616-BU-18
406-PU-18
405-GY-18
330-YL-18
312-PK-18
YL
BK
200-BK
10A
10A
799-WH-18
374-PK-18
200-BK-18
D815-PU-18
442-GY-18
441-OR-18
791-PK-18
406-PU-18
405-GY-18
616-BU-18
330-YL-18
BU
BK
YL
WH
200-BK-18
200-BK-18
BU/YL
1
574-WH-18
CHASSIS
321-BR-18
101-RD-14
A
B
103-YL-18
200-BK
3
C
306-GN-18
307-OR-18
2
BU/BK
312-PK-18
SPARE
BU/RD
200-BK-18
200-BK
615-YL
500-BR
501-GN
PK
118-GY
2
1
442-GY-18
574-WH-18
12
C
1
J
200-BK
200-BK
A
A
WORK
MODE SW
121-1124
327-PK-18
200-BK-18
327-PK-18
304-WH-10
200-BK-18
447-PK-18
113-OR-18
374-PK-18
200-BK
109-OR-10
109-OR-14
109-OR-14
200-BK
615-GN
PROV.
FOR ATCH.
ROT BEACON
1
2
200-BK-18
A
A
403-GN-18
CHASSIS LAMP
107-6689
D816-WH-18
200-BK-18
405-GY-18
327-PK-18
312-PK
406-PU-18
6
574-WH-18
D816-WH-18
BLADE
SOL
7I-2395
RESISTOR
5L-2854
129-BU-18
17
311-WH-18
ATCH
COMB./SINGL
SOL
6T-5859
447-PK-18
L
N (NOTE B)
M
Y (NOTE B)
B
406-PU-18
200-BK-18
200-BK-18
616-BU
FUEL
SENSOR
7Y-3848
310-PU-18
442-GY-18
200-BK-18
151-GN-18
154-WH-18
B965-GY-18
142-BU-18
442-GY-18
200-BK
L7
COOLANT TEMP SW
792-OR-18
ATCH CONTROL AR
COMB. 128-7861
2
321-BR-18
1
321-BR-18
B
574-WH-18
200-BK
HYD OIL
TEMP SENDER
096-4643
1
4
2
4
C
200-BK
200-BK
506-PU-18
108-BU-18
E
103-YL-18
TRENCHING
SOL
4I-5674
ATCH A/C CLUTCH SOL
101-1759
B965-GY-18
952-OR-18
142-BU-18
200-BK-18
200-BK-18
PRO.
FOR ATCH
ROT BEACON
HEATER
129-7059
ATCH
HEATER UNIT A/C
129-7060
109-OR-6
405-GY-18
330-YL-18
111-YL
112-PU-18
441-OR-18
190-PK-18
111-YL
MOTOR
103-YL-18
ENG OIL PRESS SW
SERVICE
METER
6T-7337
506-PU-18
615-YL
16
15 ALTERNATOR (P)
C
615-YL
200-BK-18
A
A
310-PU-18
200-BK
105-BR-14
C
L8
307-OR-18
817-WH-18
1
2
2
108-BU-18
190-PK
1
10
1
2
3
200-BK-18
4
109-OR-14
1
GLOW14
13 GND
BK
YL
PLATFORM
615-GN
615-YL
5
9
8
7
6
CHASSIS/BOOM
LAMP RELAY
7Y-5490
190-PK-18
D814-GY-18
200-BK-18
190-PK-18
405-GY-18
1
2
607-PK-18
+
321-BR-18
122-BU-18
-
200-BK
10A
D814-GY-18
405-GY-18
406-PU-18
441-OR-18
10A
320-OR309-GY-18
403-GN-18
312-PK
327-PK-18
10A
10A
200-BK-18
129-BU-18
122-BU-18
792-OR-18
CAB
CIGAR LIGHTER
GN
POWER
MODE SW
121-1123
200-BK-18
311-WH-18
817-WH-18
506-PU-18
327-PK-18
312-PK
L9
403-GN-18
406-PU-18
309-GY-18
441-OR-18
406-PU-18
200-BK-18
D816-WH-18
L4
574-WH-18
WIPER RELAY
7Y-5490
310-PU
200-BK
4
403-GN-18
403-GN-18
109-OR-6
309-GY-18
200-BK-6
200-BK-18
113-OR-18
4
5
321-BR-18
574-WH-18
C
310-PU-18
615-YL
112-PU-18
374-PK-18
307-OR-18
327-PK-18
L15
374-PK-18
310-PU
SWITCH
3T3132
A
200-BK-18
COOLANT TEMP SENDER
117-6399
441-OR-18
312-PK
953-GY-18
952-OR-18
T
121-YL-18
1
307-OR-18
105-BR-14
307-OR-18
7Y-5490
506-PU-18
574-WH-18
129-BU-18
519-PK
403-GN-18
112-PU
4
1
200-BK-18
200-BK-18
118-GY
2
10A
500-BR
447-PK-18
792-OR-18
NEG
POS
791-PK-18
228-BK-18
2
447-PK-18
200-BK-18
327-PK-18
501-GN
A
103-YL-18
786-GN-18
113-OR-18
MONITOR
KEY SW
200-BK-18
616-BU-18
200-BK-18
200-BK-18
200-BK-18
616-BU-18
142-BU-18
B965-GY-18
447-PK-18
113-OR-18
+BATT
ATCH-STARTAID-TEMP SW
8N-1693
200-BK-18
200-BK-18
311-WH-18
EE J-27G-1060
2
FUEL TANK UNIT
108-BU-18
3
142-BU-18
113-OR-18
B965-GY-18
506-PU-18
4
129-BU-18
200-BK-18
200-BK-18
5
519-PK
200-BK-18
374-PK-18
200-BK
320-OR
108-BU-18
952-OR-18
L8
A
320-OR-18
A
CHASSIS
312-PK-18
6
2
1
406-PU-18
615-YL
7
A
2
8
327-PK-18
L4
1
DOME LAMP
6C-9122
9
200-BK-18
10A
200-BK-18
122-BU-18
330-YL-18
403-GN-18
403-GN-18
142-BU-18
10
ENG/PUMP CONT
SOL
4I-5674
113-OR-18
405-GY-18
120-YL-18
111-YL
322-GY-18
FF A-3111-4741
320-OR-18
442-GY-18
C
447-PK-18
109-OR-6
791-PK-18
1
330-YL-18
2
200-BK-18
MOTOR
200-BK-18
B965-GY-18
D816-WH-18
200-BK-18
105-BR-14
124-GN
791-PK-18
786-GN-18
607-PK-18
109-OR-14
616-BU
129-BU-18
322-GY-18
B965-GY-18
320-OR-18
200-BK-18
D813-OR-18
309-GY-18
B786-BU-18
122-BU-18
120-YL-18
112-PU-14
200-BK-18
D815-PU-18
190-PK-18
D814-GY-18
405-GY-18
ATCH
CAB LAMP
107-6689
D816-WH-18
E
200-BK-18
406-PU-18
NOTE A: NORMALLY OPEN BEFORE REFRIGERENT CHARGE.
441-OR-18
L15
108-BU-18
6
200-BK-18
312-PK-18
200-BK-18
5
4
2
1
513-OR
309-GY-18
403-GN-18
3
405-GY-18
501-GN
327-PK-18
190-PK
109-OR-6
519-PK
L13
B786-BU-18
4
3
312-PK
S
327-PK-18
ATCH
TRAVEL
PRESS. SW
102-8041
403-GN-18
817-WH-18
PRESS. SW
102-8041
200-BK-18
WASHER
096-0486
304-WH-10
BK-0
101-RD-6
817-WH-18
200-BK-18
D814-GY-18
D816-WH-18
321-BR-18
200-BK-18
953-GY-18
441-OR-18
327-PK-18
447-PK-18
1
327-PK-18
151-GN-18
327-PK-18
200-BK-18
200-BK-18
952-OR-18
200-BK-18
DIODE AS.
131-2084
A
405-GY-18
7
K
190-PK-18
1
406-PU-18
791-PK-18
441-OR-18
ATCH
CONVERTER
108-9968
T
108-BU-18
ANTENNA
6C-3431
506-PU-18
616-BU-18
200-BK
200-BK-18
3
D815-PU-18
615-YL
442-GY-18
121-YL-18
506-PU-18
L14
1
109-OR-14
D813-OR-18
D814-GY-18
200-BK-18
154-WH-18
RD-0
CHASSIS
4
2
109-OR-14
ATCH
TRAVEL ALARM
3T-1444
190-PK
RD-0
200-BK
118-GY
792-OR-18
200-BK-18
500-BR
330-YL-18
312-PK-18
792-OR-18
113-OR-18
S
200-BK-6
405-GY-18
S
441-OR-18
607-PK-18
124-GN
616-BU
200-BK
A
200-BK-18
PANEL FUSES
616-BU-18
200-BK-18
441-OR-18
103-YL-18
S
NEG
142-BU-18
200-BK
304-WH-10
519-PK
D815-PU-18
118-GY
616-BU-18
403-GN-18
105-BR-14
616-BU-18
S
309-GY-18
1
L3
2
442-GY-18
112-PU-14
112-PU
101-RD-14
M
Y (NOTE B)
L14
200-BK-18
142-BU-18
200-BK-18
3
1
616-BU
200-BK-18
200-BK-18
TO RADIO
101-RD-14
L30
200-BK-18
330-YL-18
403-YL-18
330-YL-18
ONE TOUCH LOW IDLE
SWITCH
113-2531
ALTERNATOR
RELAY
7Y-5490
C
EE
EE
L30
L30
A
L5
RD-0
L5
POS
5
4
D815-PU-18
L3
D
403-GN-18
442-GY-18
L4
574-WH-18
200-BK
792-OR-18
786-GN-18
200-BK-18
122-BU-18
F
L15
L3
L4
SOLENOID
20A
B
200-BK-18
607-PK-18
322-GY-18
403-GN-18
501-GN
ATCH
BOOM LAMP
107-6689
228-BK-18
200-BK-18
307-OR-18
A
HORN
096-1491
L30
122-BU-18
500-BR
F
321-BR-18
V
200-BK-18
D816-WH-18
B965-GY-18
2
OPERATOR STATION
447-PK-18
CHASSIS
V 128-9403 C-2
V
B
GND
131-3407 C-2Y
109-OR-14
200-BK-18
+
S
+1
-
MOTOR
ATCH RADIO AM/FM 131-1358
K
D816-WH-18
792-OR-18
NEUTRAL
START SW
9W-2150
WIPER
124-5679
J
H
G
F
E
D
C
B
A
J
H
G
F
E
D
C
B
A
HORN SW
113-2531
200-BK-18
501-GN
616-BU-18
403-GN-18
120-YL-18
118-GY
500-BR
WH
YL
BK
RD
3
4
JJ
5
1
WASHER SW
121-1120
A
142-BU-18
200-BK
2
200-BK-18
306-GN-18
500-BR
PE
200-BK-18
WH
YL
BK
WIPER SW
121-1119
RD200-BK-18
200-BK-18
CHASSIS/BOOM
LAMP SW
121-1118
403-GN-18
FUSE
10A 9W-1442
15A 9W-1441
20A 9W-1446
THIS SCHEMATIC IS FOR THE 307 EXCAVATOR.
(129-3465)
ACTION ALARM
ACTION ALARM-
ACTION ALARM+
SWITCH AS
PREHEAT START AID
7X-6387
AM RADIO 131-1358
HORN RELAY
HEATER/
A/C RELAY
7Y-5490
TO MACHINE STRUCTURE
CONN 1
CONN 2
CONN 5
CONN 17
CONN 16
CONN 15
CONN 14
CONN 13
CONN 12
CONN 18CONN 19CONN 20CONN 21
CONN 22
CONN 23
CONN 24
CONN 25
CONN 26
CONN 11
CONN 8
CONN 6
CONN 7
CONN 10
CONN 9
CONN 4
CONN 3
D52603
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS OFF.
WIRES THAT HAVE BATTERY VOLTAGE
WHEN THE KEY SWITCH IS ON.
STARTING CIRCUIT
GUAGE CIRCUIT.
MONITORING CIRCUIT.
PANEL LAMP CIRCUIT.
WIPER/WASHER CIRCUIT.
HEATER AND AIR CONDITIONER CIRCUIT.
GROUND CIRCUIT.
START AID CIRCUIT.
CONTROLLER CIRCUIT.
ALL DASHED LINES ARE ATTACHMENTS.
