307 EXCAVATOR ELECTRICAL SYSTEM SCHEMATIC USED IN SERVICE MANUAL SENR6230

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3070778
MACHINE HARNESS CONNECTOR AND COMPONENT LOCATIONS
13
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8
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1
2
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18
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27
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7
41
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AREA A 3070779
1
2
3
33
34
35
3070780
AREA B
Component Location
Component
Schematic
Location
Machine
Location
Component
Schematic
Location
Machine
Location
Actuator - Engine Governor
F-4 1A
Solenoid - Air Conditioner Compress Clutch
B-8 31
Alarm - Action
D-2 2A
Solenoid - Engine Shutdown
B-9 32
Alarm - Travel
A-6 3
Solenoid - Engine Pump Control
A-6 33B
Alternator
B-8 4
Solenoid - Travel Speed
B-6 34B
Antenna
E-9 5
Solenoid - Trenching
A-6 35B
Battery
A-3 6
Switch - Cab Heater
E-2 36A
Breaker - Alternator
D-2 7A
Switch - Coolant Temperature
A-8 37
Controller
E-4 8A
Switch - Disconnect
A-3 38
Converter
E-8 9A
Switch - Engine Oil Press
A-8 39
Fuse - Block
E-8, F-8 10A
Switch - Horn
F-3 40
Horn
B-2 11
Switch - Light (Boom/Chassis Lamp)
F-5 41A
Lamp - Boom
B-2 12
Switch - Light (Cab Lamp)
F-6 42A
Lamp - Cab
E-1, F-1 13
Switch - Neutral Start
F-2 43
Lamp - Chassis
A-2 14
Switch - One Touch Low Idle
E-3 44
Lamp - Dome
C-5 15
Switch - Power Mode Control
E-2 45A
Lamp - Glow
F-4 16A
Switch - Press
A-7 46
Lighter-Cigar
F-5 17A
Switch-Pump
F-6 47A
Monitor
E-3 18A
Switch - Refrigerant Low Press
B-7 48
Motor - Starter
A-9 19
Switch - Starter
F-4 49A
Motor - Washer
B-7 20
Switch - Travel Alarm Cancel
F-6 50A
Motor - Wiper
F-1 21
Switch - Travel Press
B-7 51
Plug - Glow
B-9 22
Switch - Travel Speed Control
E-2 52A
Pump - Fuel
A-5 23
Switch - Washer
F-5 53A
Relay - Heater
E-7 24A
Switch - Wiper
F-5 54A
Relay - Horn
D-7 25A
Switch - Work Mode Control
E-2 55A
Relay - Safety
E-9 26A
Timer - Engine Shutdown
E-8 56A
Relay - Starter
E-7 27A
Timer - Travel Alarm
E-9 57A
Sender - Engine Coolant Temperature
B-B 28
Unit - Air Conditioner
F-5 58
Sender - Hydraulic Oil Temperature
B-6 29
Unit - Heater
F-4 59
Sensor - Fuel Level
A-6 30
Harness Connector Location Chart
Connector
Conn No. &
Machine
Location
Harness And/Or
Components
Schematic
Location
Connector
Conn No. &
Machine
Location
Harness And/Or
Components
Schematic
Location
21 Contacts
CONN33
C - 116-0125
Monitor
E-2
CONN19
C - 116-0125
Travel Alarm Cancel Switch
E-6
CONN1
C - 116-0125
B - 111-4722
C-4
CONN20
C - 116-0125
Cab Lamp Switch
E-6
CONN2
C - 116-0125
A - 111-4721
C-4
CONN21
C - 116-0125
Pump Switch
E-6
7 Contacts
CONN28
C - 116-0125
Controller
E-4
CONN22
C - 116-0125
Washer Switch
E-5
CONN29
Engine Governor Actuator
Controller
E-4
CONN24
C - 116-0125
Boom/Chassis Lamp Switch
E-5
CONN10
C - 116-0125
Safety Relay
E-8
CONN33
C - 116-0125
Action Alarm
D-2
CONN26
M - 101-2375
Air Conditioner Unit
F-5
CONN46
B - 111-4722
D - 111-4754
B-3
CONN6
C - 116-0125
G-102-7953
D-9
CONN46
B - 111-4722
E - 111-4755
B-3
CONN11
C - 116-0125
Travel Alarm Timer
E-8
CONN46
B - 111-4722
K - 105-9946
B-3
CONN18
C - 116-0125
Horn Relay
D-7
CONN49
B - 111-4722
Fuel Level Sensor
A-6
CONN38
G - 102-7953
F - 102-7952
D-1
CONN50
B - 111-4722
Trenching Solenoid
A-6
CONN39
F - 102-7952
Wiper Motor
F-1
CONN51
B - 111-4722
Engine/Pump Control Solenoid
A-6
CONN12
C - 116-0125
Engine Shutdown Timer
D-8
CONN52
B - 111-4722
Travel Alarm
A-6
CONN23
C - 116-0125
Wiper Switch
E-5
CONN53
B - 111-4722
Travel Speed Solenoid
B-6
CONN27
C - 116-0125
Heater Unit
F-5
CONN54
A - 111-4721
Pressure Switch
A-7
CONN3
A - 111-4721
C - 116-0125
C-5
CONN55
A - 111-4721
Travel Pressure Switch
B-7
CONN34
C - 116-0125
Work Mode Control Switch
E-2
CONN56
M - 101-2375
Refrigerant Low Pressure Switch
B-7
CONN35
C - 116-0125
Travel Speed Control Switch
E-2
CONN57
M - 101-2375
Air Conditioner Compress Clutch
Solenoid
B-8
CONN36
C - 116-0125
Power Mode Control Switch
D-2
CONN60
C - 116-0125
Converter
D-8
CONN37
C - 116-0125
Cab Heater Switch
D-2
CONN13
C - 116-0125
Engine Shutdown Timer
D-8
CONN61
C - 116-0125
Converter
D-9
CONN15
C - 116-0125 E-8
2 Contacts
CONN5
C - 116-0125
H - 105-9967
D-9
CONN17
C - 116-0125
M - 101-2375
F-8
Harness Connector Location Chart
Connector
Conn No. &
Machine
Location
Harness And/Or
Components
Schematic
Location
Connector
Conn No. &
Machine
Location
Harness And/Or
Components
Schematic
Location
CONN30
C - 116-0125
Horn Switch
F-3
CONN45
E - 111-4755
Boom Lamp
B-2
CONN31
C - 116-0125
Low Idle Switch
E-3
CONN45
E - 111-4754
Boom Lamp
B-2
CONN40
H - 105-9967
J - 106-0024
E-1
CONN45
P - 105-9946
Boom Lamp
B-2
CONN41
J - 106-0024
Cab Lamp
E-1
CONN47
B - 111-4721
Chassis Lamp
B-3
CONN42
H - 105-9967
J - 106-0024
F-1
CONN48
B - 111-4721
Fuel Pump
A-5
CONN43
J - 106-0024
Cab Lamp
F-1
CONN58
A - 111-4721
Engine Oil Press Switch
A-8
CONN44
E - 111-4755
Boom Lamp
B-2
CONN59
C - 116-0125
Glow Lamp
F-4
3 Contacts
10 Contacts
6 Contacts
5 Contacts
4 Contacts
2 Contacts
Bullet
Terminal
Bullet
Terminal
Bullet
Terminal
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 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.
5
10
11
9
8
25
9
28
A
A
A
A
A
A
A
31
A
24
A
2
1
26
A
14
A
8
12
A
3
A
1
A
4
A
2
A
35
A
30
A
7
7
A
6
5
4
3
27
24
25
26
20
19
12
33
A
16
14
13
34
A
27
A
20
A
22
A
15
1
B
17
2
B
3
B
18
23
22
21
6
A
13
A
15
A
16
A
17
A
18
A
©
1994 Caterpillar
All Rights Reserved
Printed in U.S.A.
SENR6193
July 1994
307 Excavator Electrical System
2PM1-UP