Harness And Wire Electrical Schematic Symbols
SENR8974-01 February 2001
Symbols
T
Pressure Symbol
Temperature Symbol
ComponentLocation Schematic Location
Component 23
22
Actuator-Engine Governor
A
A-9
Alarm- Travel
2
1
17 19
24 20
11
21
18
12
D
4 26
8
15 14 3
5
10
13
E
C
B
6
16
9
8 13
B-8
14
Sensor - Sun Load
F-1
E
I-8
D
Solenoid - A/C Clutc h
C-9
15
Breaker - Main
I-8
D
Solenoid - Engine/P ump Control
A -7
16
Control - Engine/Pump
F-2
C
Solenoid - Engine S hutdown
B -8
8
Controller - Wiper/Washer
E-1
E
Solenoid - Fine Swing
E -7
18
Converter - Voltage
C-5
D
5
F
23 9
A
22
16 19
Ground - Cab
B -5
22
Solenoid - Swing Brake
Ground - Cab
E -1
E
Solenoid - Travel Speed
A- 7
16
Ground - Chassis
A -3
8
Solenoid - Tr enching
A- 7
16
Ground - Chassis
A -8
7
Switch - Air Cleaner Flow
H-9
20
Ground - Chassis
I-8
D
Switch - Aux Hydraulic Pressure
H-3
B
Ground - Platform
G-2
F
Switch - Bac kup EPR Valve
E -5
C
Ground - Platform
H-1
F
Switch - Bac kup Governor
D-5
C
Ground - Relay Panel
H-7
D
Switch - Boom Raise Pressure
D-8
C
I-8 I-6
E
7
Switch - Engine Oil Pressure
B- 9
11
E
Switch - Fine Swing Control
D-4
C
Meter - Service
F-1
E
Switch - Horn
I-1
B
Monitor
F-1
E
Switch - Hydraulic Oil Filter
A- 5
12
I-9
D
Switch - Hydraulic Oil Lev el
A-5
12
Motor - Lower Wiper
H-1
9
Switch - Implement Pressure
D-8
18
Motor - Starter
B -8
8
Switch - K ey
F-3
C
I-9
D
Switch - Lower Washer
D-4
C
C-5
23
C-6,I-3 I-7
13 8 14 12
6
24
A D
Switch - Lower Wiper
D-3
Switch - Neutral Start Limit
I-1
Switch - One Touch Low Idle
F-2
Relay -C -Cab/Chassis Lamp
I-7
D
Switch -R -Refrigerant Low Pressure
Relay - Horn
I-7
D
Switch - Start Aid
Relay -Hydraulic Lock So Solenoid
I-7
D
Switch -S -S at rt Aid Coolant Temperature
G-7
D
Switch - S uction Line Shutoff Limit
Relay - Neutr al S tart
1 11
16
19 D
7
E -1
Relay - Main
26
H-9 I-8
A -2
Lighter
Radio - 12VDC
25
Switch -C -Coolant Lev el Switch - Disconnect
C-9
2
Sender: Acomponentthatisused withatemperatureorpressuregaug u reorpressuregauge.Thesender measuresthetemperatu e sthetemperatureorpressure. Itsresistancechangestogiveanindicationto thegaugeofthetemperatureorpressure.
T
Relay (Magnetic Switch): Arelayisanelectricalcomponentthatisactivatedbyelectricity. It has a coilthat makes an el ectromagnet when current flowsthrough it. The electromagnetcanopenorclosetheswitchpartoftherelay.
6DR1-UP
Solenoid: Asolenoidisanelectricalcomponentthatisactivatedbyelectricity. Ithasa coilthatmakesanelectromagnetwhencurrentflowsthroug e ntflowsthroughit. The electromagne o magnet canopenorclosea valveormoveapieceof metalthatcandowork. Magnetic Latch Solenoid: Amagneticlatchsolenoidisanelectricalcomponentthatis activatedbyelectricityandheldlatch e dbyelectricityandheldlatchedbya permanentmagnet.Ithas . Ithas twocoils(latchandunlatch) thatmakeelectromagnetwhencurrentflowsthroughthem.Italsohasan internalswitchthatplaces thelatchcoilcircuitopenatthetimethecoillatches.
Harness and Wire Symbols Wire, Cable, or Harness Assembly Identification: Includes Harness Identification Lettersand Harness Connector c tor Serialization Codes(seesample).
F-7
D
Switch - Throttle Position
D
Switch - Travel Pressure
D
Switch Panel
F-2
C
I-8
D
Unit - A/C, Heater
G-5
21
Sender -C -Coolant Temperature
B -9
2
Harness Identification Letter(s): (A, B, C, ..., AA, AB, AC, ...)
AG-C4 111-7898
12
F-8
D-8
Reed Switch: Aswitchwhosecontactsarecontroll a ctsarecontrolledbya magnet. Amagnetclosesthe contactsofa s ofa normallyopenreedswitch;itopensthecontactsofanormallyclosedreedswitch.
330B L Excavator Electrical System
C
B-9
E-3
Ground (Case): Thisindicatesthatthecomponentdoesnothaveawireconnectedtoground. Itisgroundedbybeingfastenedtothemachine.
19
E -7
Relay - Timer
Ground (Wired): Thisindicatesthatthecomponentisconnect e sthatthecomponentisconnectedtoa e dtoa groundedwire.The groundedwireisfastenedtothemachine.
B
C
Resistor - Backup
Relay - Start
Switch(NormallyClosed): Aswitch Closed): Aswitch that will open at a specified point (temp, press,etc.). Nocircleindicatesthatthewirecannotbedisconnec e sthatthewirecannotbedisconnectedfromthecomponent.
C
D-5
A-6
Switch (Normally Open): As Open): As witch that willclose at a specified point (temp, press, etc.).The circleindicatesthatthecomponenthasscrewterminalsandawirecanbedisconnectedfromit.
18
Horn
Relay - Boom Lamp
18
D 10
E- 7
C
L-C12 3E-5179
L-C12 3E-5179
Harness Connector Serialization Code: The"C"standsfor "Connector"and the number indicateswhichconnectorinthe harness (C1, C2, C3, ...).
1
Part Number: forConnectorPlug
18
Part Number: forConnectorReceptacle
2 Plug
Machinelocationsare repeatedforcomponentslocated closetogether. A= Locatedinoperators compartment.
Receptacle Pin or Socket Number
1 2
Deutsch connector: Typicalrepresentation ofaDeutschconnector.Theplugcontainsall socketsandthereceptaclecontainsallpins.
1 2
Sure-Sealconnector: Typicalrepresentation ofaSure-Sealconnector.Theplugandreceptacle containbothpinsandsockets.
5A
C= Locatedinoperators rightconsolearea. D=Locatedinrelaypanelarea. E=Locatedindasharea.
9X-1123
Fuse (5Amps)
B =Located inoperatorsleft consolearea.
Machine Harness Connector and Component Locations
Circuit Breaker Symbol
Flow Symbol
Fuse: Acomponentinan electricalcircuitthatwillopenthecircui i calcircuitthatwillopenthecircuitiftoo muchcurrentflows throughit.
F
A -7 H-9
Motor - Upper Wiper
C
4
17
I-1
Solenoid - Level Finish Solenoid - Start Aid
Motor - Upper Washer
10 2 15
Solenoid - Hydraulic Lock
D B
Motor - Lower Washer
21 20
A
H-7 I-4,5,6
Ground Strap - Chassis to Platform
3
12
B-8 A-5
Sensor- Pump DischargePressure
5
Ground Strap -C -Chassis o t Disconnect Sw.
19
A-5
Sensor- EngineSpeed Sensor- FuelLevel
D
Breaker - Alternator
Fuses
B
Sender- HydraulicOilTemperature
3 4
F-8
Diode - Main Relay
F
7
1
G-9
Level Symbol
Symbols and Definitions
Machine Location
C-8
Assembly-Terminal Block Batteries - 12VDC
Schematic Location
Component
H-8,I-8
Alternator 25
Machine Location
Component PartNumber
325-AG135 PK-14 Harness identification code: Thisexampleindicateswiregroup 325, wire135in harness"AG".
WireGauge WireColor
F=Locatedundercabfloorplate.
©2001 Caterpillar All Rights Reserved
Printed in U.S.A.
WireDescription Wire Wire Number Color
Description
Wire Wire Number Color
Power Circuits
Connector Location Connector Number
Schematic Location
Machine Location
CONN 1 A-9 26 CONN 2 F-9 D CONN 3 F-9 D CONN 4 G-9 D CONN 5 G-9 D CONN 6 G-8 D CONN 7 G-8 D CONN 8 G-8 D CONN 9 F-8 D CONN 10 C-6 22 CONN 11 C-5 22 CONN 12 C-5 F CONN 13 C-4 F CONN 14 F-5 C CONN 15 F-5 C CONN 16 F-5 C CONN 17 F-5 C CONN 18 F-4 C CONN 19 F-4 C CONN 20 F-4 C CONN 21 F-4 C CONN 22 H-5 B CONN 23 H-5 B CONN 24 H-4 B CONN 25 H-4 B CONN 26 H-4 B CONN 27 H-4 B CONN 28 H-3 B CONN 29 H-3 B CONN 30 C-3 F CONN 31 B-3 6 CONN 32 A-3 6 CONN 33 B-2 25 CONN 34 D-2 F The connectors shown in this chart are for harness to harness connectors. Connectorsthatjoina harnesstoacomponentaregenerallylocatedatornear thecomponent. SeetheComponentLocationChart.
RD
Batttery (+ )
512
GN
Radio Speaker - R ight (Common)
RD
Aux. Ckt.
513
OR
A/C Compressor/Refrigerant Pressure Sw.
105
RD
Key Sw.
519
PK
Thermostat ot Refrigerant Pr essure Sw.
107
RD
Engine S hutdown
108
BU
Title
Form Number
Alternator:(100-5047)
BU
Aux. Hydraulic - Rotate CW
547
OR
Aux. Hydraulic - Rotate CCW
RD
Alt. Output (+) Term.
548
GY
Aux. Hydraulic - Open
RD
Aux. Ckt.
549
PK
Aux. Hydraulic - Close
112
PU
Main Power Relay Output
576
PK
Wiper -A -Aux. L ( ow)
113
OR
Opr. Mon. Panel B( B(+) Switched
114
RD
Warning Horn (F (Forward)
578 590
GY
Wiper Sw Sw. o t Intermittent Module
Aux. Ckt. Aux Ckt
A513
RD
DC/DC Converter Memory Output
YL
Aux. Ckt.
A5 7 1
PU
Aux. Ckt. #1
123
WH
Aux. Ckt.
A5 7 2
PK
Aux. Ckt. #2
124
GN
A/C
A579
OR
Wiper Motor (+)
129
BU
Aux. Ckt.
A586
OR
Wiper S w. to Wiper Control
140 149
BU PU PU
BU
Was her -A -Aux.
PK GY
120
147
592
BU
115 118
DC/DC Converter Power Output
Resistor, Sender and Solenoid Specifications Par t No .
Co m p o n en t Des c r i p t i o n
3E-6332
Solenoid:
Start Aid St
3E-7985
Solenoid:
Engine Shutdown
Res i s t an c e (Oh m s )¹ 6.0 Start (Latch) Coil- 1.55 ±0.15 Stop (Unlatch) Coil- 10.3 ±1.03 20824-25451@0°C (32°F)
Aux. Ckt.
A588
GN
Safety Solenoid Relay to Solenoid
Aux. Ckt.
C537
GN
A/C Photo Sensor (+) Signal
Aux. Ckt.
C538
OR
A/C Photo Sensor (-) Signal
607
PK
Flood Lamp - Front
973-1189@ 75°C(167°F)
15 0
RD
B att er y( y( +)
151
GN
Aux. Ckt.
6134-7496@25 °C(77°F) 3989-4875@35 °C(95°F) 4I-5394
Lighting Circuits
Sender:
Hydraulic Oil Temperature
2224-2718 @5 @50 °C 1 ( 22 °F)
152
BU
Aux. Ckt.
615
YL
Cab Flood Lamp
475-522@100°C(212°F)
154
RD
Aux. Ckt.
616
BU
Boom Flood Lamp
221-269@125°C(257°F)
168
RD
Aux. Ckt.
172
RD
Control Circuits
Aux. Ckt.
177
RD
Main Breaker
180
GN
Aux. Ckt.
763 786 788
BU
Tor que Converter Sw.
GN
Engine Speed Control -H -Hi Pressure Sw.
YL
Engine Speed (+)
185
YL
Aux. Ckt.
791
PK
Engine Speed Control - Lo Solenoid
189
RD
Aux. Ckt.
A755
PK
Thr ottle Sw. #1
191
WH
Aux. Ckt. Ground Circuits
200
BK
A7 5 6
BU
Thr ottle Sw. #2
A757
GY
Throttle Sw. #3
Main Chassis
A758
BR
Throttle Sw. #4
201
BK
Operator Monitor Return
A761
PU
Electronic Pump Control Ground
2 35
BK
E el ct o r ni c Pu mp C on rt ol Gr Gr ou nd
A 76 2
PU
E el ct o r ni c Pu mp C on rt ol E ng ni e Sp ee d Gr ou nd
Basic MachineCirc uits 301
BU
30 4
W H
Starter No. 1 Sol
A768 A769
S at r et rR rR ela yN yNo .1 .1 Ou Out pu t
A 770
BU GY P K
A771
PU
Float Sw.
F771
OR
Backup Sw.
308
YL
Main Power Relay Coil
F772
WH
Backup Sw.
Start Aid Sw. to S at rt Aid Sol
F773
OR
Gov ernor A ccel.
WH
Start Aid Sol to
F774
WH
Gov ernor Decel.
320
OR
Horn Relay Coil to Sw.
961
BR
Selector Sw.
321
BR
Travel Alarm
K904
GN
Pump Discharge - Signal
322
GY
Warning Horn (Forward)
K905
RD
Pump Discharge -+ -+B
326
RD
Key Sw. C " " Term.
K906
GN
Swing Brake Solenoid -S -Signal
386
PK
Air Sh Shutoff Solenoid Enable
K907
BU
Swing Brake Solenoid -+ - +B
Sw.
K 90 9
BU
GN
Alternator (R) Term.
K911
PK
E/P Controller -R -RS485 (+)
GY
O pr .Mo n. Oi Oi lP e r ss .( Low Se Se tti ng )
K 91 2
GN
EP / Co Co ntr ol el r- R S4 85 ( )-
412
BU
Opr. Mon. Cool Flow
K915
GN
Fine Swing Sw. -E -E/P Controller
430
BU
Opr. Mon. Air Filter
K997
BU
+ V Se n s o r
OR
Hydraulic Oil Flow Switch
L908
OR
Controller RS-232C TX
49 1 4 92
P K
H yd a r ul ci Oi Oil Te Te mp er at ur eS eS en so r
L 90 9
B U
11.7 ± 1.2
121-1491
Solenoid:
134-3998
Solenoid:
Level Finish Trenching Hydraulic Lock Swing Brake TravelSpeed
32.0 ±3.2 32.0 ±3.2
A /C Clutch
17.6 ± 0.6
¹ Atroomtemperatureunlessotherwisenoted.
Off Machine Switch Specification Pa rt No .
Fu n c t i o n
3E-6449
StartAidCoolantTemperature
3E-6455
EngineOilPressure
B ac ku pS w. -+ B
403 40 5
487
52.0 ± 2.6
Engine/Pump Control
Solenoid:
Pump Control Valve #2 (-)
Starter Relay Coil Key Sw. to Neutr al Start Sw.
PU
B ackup Ba
Solenoid:
121-1490
E el ctr on ci Pu Pu m p Co Co ntr ol By By pa ss Sw Sw .
GN OR
311
Resistor:
111-9916
PumpControlValve #1 (+)
306 307 310
102-8017
106-0179
Implement Pressure Travel Pressure
106-0180
BoomRaisePressure
106-0181
HydraulicPressure
109-9330
Air Cleaner
C on rt oll er RS RS 2 - 32 CR CR X
GY
C oo al nt Te Te mp er at ur e Se ns or S gi na l
L 96 8
OR
495
GN
Fuel Level Sensor
L969
OR
Electronic Pump Control PS Valve (+ )
4 96
WH
O pr . Mo n. P an el H yd ra ul ci O li L ev el
L 97 0
GY
E el ct o r ni c Pu mp C on rt ol to to S w. C om m on
E el ct o r ni c Pu mp C on rt ol P SV SV al ve ( )-
Ac t u a t e 38 ±3°C (100.4±37.4°F) 90 ±21 kPa (13±3.0psi) 1225.0 ± 98.0 kPa (177.67 ±1 ±14.21 psi)
Deac t u a te 27°C
( 10 ± 3 . 0p s)i
A - C, N o m r ally C o l se d
882.0 kPa MIN (127.92 psi MIN) 2 15 6± 6± 19 19 6k 6k Pa
12 - No No m r al yl Op Op en
( 38 4 ± 28 p si )
( 31 3. 00 ± 2 8. 00 p si )
1 -3 N or ma l y Cl os ed
4 90 . 00 ± 4 9. 00 k Pa
2 9 0. 00 k Pa M N I
( 71 0 . 7 ± 7. 11 p si )
( 42 0 . 6 ps i MI N)
635±58 mm H2O
-
C468
BU
Engine Oil Level
L971
GN
Electronic Pump Control o t Travel Pressure Sw.
L 97 2
B U
L ow Id el Sw Sw .
SENR4975
501
GN
Wiper - Front (Low)
L973
GN
Fine Swing Control Relay o t So Solenoid Valve
²Contactpositionatthecontactsofthe harnessconnector.
RENR1998
506
PU
Washer - Front
L974
GN
Electronic Pump Control Boom Raise Pr Pressure Sw.
SENR9292
508
PU
Radio Speaker -L -Left
L975
PK
Star t Aid Control Lamp 1O 1Output
509
WH
Radio Speaker - Left (Common)
L977
YL
Trenching Solenoid
511
BR
Radio Speaker -R -Right
L978
GY
Level Finish Solenoid
(6V-5227) Consist:6V-5538
Accessory Circu its
RefrigerantLowPressure
NormallyOpen
26 2 6 46 ± 19 6k 6k Pa
Engine/PumpControl:
114-5333
NormallyClosed AB - ,N ,N or ma ll yO yO pe n
StartingandCharging:
SENR2082 SENR3860
Co n t ac t Po s i t i o n
(80.6°C) 7 0± 0± 21 kP kP a
275 to 1750 kPa¹ (39.9 to 253.8 psi) ¹Withincreasingpressuretheclosedconditioncanbe maintainedupto2800kpa(405psi),withdecreasingpressuretheclosed conditioncanbemaintaineddownto170kpa(25psi).
Electric Starting Motor: 6( V-0512)
546
Aux. Ckt.
109 111
Monitoring Circuits
Related Electrical Service Manuals
Description Accessory Circ uits (Continued)
101 103
NormallyOpen Normally Open NormallyOpen²
Real Time Error Codes Co d e 1 30 1 1302 1303 1 30 4 1 30 5 2201 2202 2301 2302 2303 2 30 4 3 20 1 4101 4102 4103 4105 4106 4107 4108 410A 4 20 1 4202 4203 4204 4207 420A 420B 420C 420D 420E 4301 4302 4 30 3 A201 A202 A203
Des c ri p t i o n o f Pr o b l em s E n gi n e oi l p e r s su r esi t o o o l w. Enginecoolanttemperatureistoohigh. Hydraulicoiltemperatureistoohigh. A i r if l e t r i s cl o gg e d. B atte yr v o tl ag e i s no t n or m al . Governoractuatorfeedbacksensorcircuitisopenorshortedtobat t edtobatteryvo t eryvoltage. Governoractuatorfeedbacksensorcircuitisshortedtobodyground. Governoractuatorfeedbacksignalisnotstable. Governoractuatorfeedbacksignaldeviates. Governoractuatordoesnotmove. C al i br aito n da t a er ro r. M o ni t or R A M si n o t no rm a.l Electricpowersupplytothecontrolleristoomuch(43volts). Over-currentinproportionalreducingvalve. Proportionalreducingvalvecircuitisopen. Over-currentindigitaloutput(trenchingsolenoid). Over-currentindigitaloutput(finecontrolsolenoid). Over-currentindigitaloutput(travelspeedchangesolenoid). Over-currentindigitaloutput(travelalarm). m ). Over-currentindigitaloutput(swingbrakesolenoid). E n gi n e sp ee d i s no t n or m al . Enginecoolanttemperaturesensorisshortedtobodygr e dtobodyground. Hydraulicoiltemperaturesensorisshor o risshortedtobod t edtobodyground. PWMsensorofpumpdeliverypressureisshortedtobodygr e dtobodyground. PWMsensorofpumpdeliverypressureisopenincircuit. u it. Fuelsensorisshortedtobodyground o und. Fuelsensorisopenorshortedtobatteryvo t eryvoltage. Electricpowersupplyistoolow(below23volts). Electricpowersupplyistoohigh(above32volts). s ). Enginespeeddialisnotinoneofthe10specifiedpositions i ons. Datamismatch1betwe c h1betweenalternatorandspeedsensor(alternato n atorisabnormal) m al). Datamismatch2betwe c h2betweenalternatorandspeedsensor(speedsensorisabnormal) m al). E ng n i e st al sl . Monitorcommunicationisnotnormal. Monitortakestoomuchtimeto respondtocontroller'ssignal. Communicationisabnormalincontroller.
) s e h c n i 4 2 x s e h c n i 4 3 : s n o i s n e m i D (
1 0 4 7 9 8 R N E e , S g a
P 6 1
