D8R Electrical System

COMPONENTLOCATIONCHART Machine Location

Schematic Location

Component

C

Alarm-Action

1

Alarm- Backu p

Machine Location

D-7

18

Component

A-7 A-3

A -1

16

Solenoid - Air Condit oi ner Clutch

A -2

F 6-

2 0

S o l e n o i d- D vi e r et rV a l ve

E 8-

Solenoid- PrelubeTimer

D-2

Breaker e r - Blower Motor(20A)

F-7

20

Solenoid- Ripper PinPuller

C-9

E

Breaker e r - RemoteCondenser(20A)

F-7

21

Solenoid-StartAid

B-2

4

B u sB a r

F-2

16

S u pp r es s or - A r c

A-2

5

Converter- Volta ge ge

F-5

16

Switch- A/C Refrig e rantPressure erant u re

B-2

B

F li et r - Al et r nat or

E

Breaker e r - Alternator n ator(60A)

19

E-8

B 5-

C

E

F u se s

B

Gauge- Coolant Temp

A-6

B

Gauge- FuelLevel

A-5

B

12

E - 7, E 8-

7 22 14

S wi ct h- Ba cku pA al r m

F-5

Gauge- HydraulicOil Temp

B-5

23

Switch- Diverter t er Valve

A-7

Gauge- Powertrain t rainTemp

B-6

24

Switch- Engin e Coola n t Flow(EMS) nt

B-2

Horn- Forward

E-1

22

Switch- Engin e Coola n t Tempe nt r ature (EMS) ratur

B-2

B

Lamp- Actio n

C-5

25

Switch- Engine OilPressure u re(EMS)

B-2

B

Lighter - Cigar

B-7

Meter- Service Motor- Blower

7

Motor- Condenser

8

B

B-6

M o ni t or - O p er a o t r

7

Motor- FrontWiper

9

Motor- LeftWiper

10

Motor - Rear Wiper

D

C-6

A

Switch- Flood Lamp

B-2

Switch- HydraulicOilTemp(EMS)

A-7

Switch- HydraulicOilFilter Press(EMS)

A-9

27 27 B

Switch- HydraulicOilFilter Temp(EMS)

A-6

A

Switch- LeftWiper

E2 -

C

S wi wi ct h- N eu rt al S / a t tr

D7 -

Motor- Washer Pump

A-8

12

Switch- OilPressure u re(Atch)

D-2

14

Outlet - Power

B-7

B

Switch- Operator a torMonitor Test

C-5

Radio

A-5

27

Switch - Powertrain Oil Filter Pres s (EMS)

A-8

15

Receptacle- AuxStart

F-2

19

Switch- Powertrain t rainOil Temp(EMS)

A-3

Relay

B-9

R e al y- M ani

27

F-8

R elay - Start

A

Switch- Powertrain t rainOil Filte r Temp(EMS)

15

27

3

14

22

6

1 2

4

16

25

26 2

20

24

21

12 19

D8R Tractor  Electrical System 7XM1-UP 9EM1-UP

B-8

A

Resistor - Blower Motor Speed

C-4

D

Switch - Ripper Pin Puller

A-8

Resistor t or - Starte r Diagnostic

F-1

B

Switch- RunningLamp

C-5

16

Sender - Coola n t Temperatur nt e (Gaug e) e)

A-2

17

Sende r - Fuel(Gaug e) e)

B-9

7

9 4

A-8

S w ti c h- R e ar W i pe r

F -7

7 12

B

11

E

B-7

 A 7

B

C

18 13

D-5

Motor- RightWiper M ot or - S a t tr er ( Pr el ub eA ct h)

13

E

5

7

A-9

Switch -K -Key Start

11 12

E

D 3

A-7

Switch- FuelPressure u re(EMS)

18

F-5

23

B-7

26

B-9 B-4

 A

17

C-5

Switch- Forward Horn S w ti c h- F r on t W i pe r

D-4,C-4

D-8

8

D-6 B-2

6

B

1

10

D 7-

S w ti c h- B l o wer Switch- Coola n t Tempe nt r ature ratur Switch- Disconnect

B

D

SENR8332 November1995

Schematic Location

Alternator B a te t r ei s - 12 12 V o l t

E

F-9

Sender - Hydraulic(Gaug e) e) Sender - Powertrain t rainOil(Gaug e) e)

2 3

Switch - Right Wiper

B -8

Switch-StartAid

C-5

Switch- Thermosta m ostat (A/C)

E-6

13 3

Machineloca tionsarerepeatedforcompo tions nentslocatedclosetogeth nents er. er.  A = Compo nents loca nents tedinoperator's com tedinoperator's partment.

14

B =Components locatedin dash. 4

E

C =Componentslocatedinoperator'sleftconsole.

3

D =Componentslocatedinoperator'srightconsole .

5

E =Components locatedon relay panel.

9

4

C

10

19

B

20

Component

Part No.

S ol en oi d - Ai r Co nd ti o i ne r Cl ut ch

6

16

1

2

O v er al l2 . 0 ± . 1; T a p 1. 0 ± . 0 5

6 T- 22 1 7

21

D

23

Resistance O ( hms) ¹

9 G1- 9 5 0

R es si o t rr- S at tr er D / ai gn os it c

26

2

22 25

RESISTORANDSOLENOIDSPECIFICATIONS R e si sot r - B ol w er M o o t r S pe ed

12

15 8  A

17

24

11

1 50 0. ± 7. 5

1 02 0 - 34 7

1 4. 4± 0 6 .

So eln o id - Div e r et r Va Val e v

127 0-5 7 4

31. 0 ± 3. 0

So eln o id - Ri per Pi Pin Pu l l e r

9G 9- 9 88

Solenoid - Start Aid

3E-6332

27

1

24 9.

18

6

7

¹At roomtemperature.

©1995 Caterpillar   All Rights Reserved

D39055

Machine Harness Connector And Co Component mponent Locations

HARNESSCONNECTOR LOCATIONCHART Connectors

Title

Machine Location

20Contacts

RELATEDELECTRICALSERVICEMANUALS Form No.

 Alternator (1 00-5047): 00-5047): Consist No.100-5045 Consist No.100-5046

*

SENR4130 SENR2082

Ele c t or ni c M on ti o irn S g yste m ( E MS )

S EN R 29 45

Starting And Charging Systems Starting Motor: (6V-0890) ConsistNo.6V-0890

SENR2947

E

B 9Contacts B B

SENR3860 1 8Contacts 1 * 7Contacts

Description

Wire Wire Number  Color 

PowerDistributionCircuits

2 2

WIREDESCRIPTIONCHART Wire Wire Number  Color 

Description

6Contacts

MonitoringCircuits(cont'd)

3 *

HarnessAnd/OrComponent s  A-6Y-4522 Diagnosti cConnector   A-6Y-4522 OperatorMon itor(EMS) itor(EMS)  A-6Y-4522 B - 127-5121  A-6Y-4522 UU - 129-6268 B - 127-5121 UU - 129-6268 MM - 127-5120 NN - 9U-9463 MM - 127-5120 NN - 9U-9463 MM - 127-5120 Radio  A-6Y-4522 C - 8E-0599  A-6Y-4522 C - 8E-0599  A-6Y -4522  A-6Y-4522  A-6Y-4522 VoltageConvert er 

101

RD

BAT

415

GN

OPR MON TEST SW

Machineloca tionsare repeatedforconne tions ctorslocatedclosetogeth ctorslocatedclosetogeth er. er.

1 02 105

BU BR

H D L MP KEYSW

424 426

GY BR

O P RM ON P O WE RT R AI N T E M P OPRMONPOWE R TRAINOILFILTE R

*= Connecto ris locatedatthecomponent. ris

108

BU

AUX CKT

441

OR

ENG COOLANT TEMP GAGE

109

OR

ALT OUTPUT + ( ) TERM.

442

GY

HYD SYSTEM TEMP GAGE

112

PU

MAINPOWER RELAY OUTPUT

443

YL

POWER TRAINTEMPGAGE

113 114

OR GN

OPRMONPANEL VMISB+SWITCHED WARNING HORN(FORWARD)

449 499

BU GY

SPDOM SENDE R (SIGNALNO.1) OPRMONIMPLEMENTOIL FILTE R

116

BR

1 21 123

YL WH

AUX CKT

1 24

GN

A/C

200 201

BK BK

A447

B AC K UP A L A R M T O LA MP A UX CKT

500 501

GroundCircuits

PK BR GN OR

WIPER -FRONT(HI)

503 504

BR YL

WIPER - REAR(PARK) WIPER - REAR(LO)

BK

CHASSISDIAGNOSTIC

505

BU

WIPER - REAR(HI)

BK

STA R T ER D I AG N OS TC I

510

YL

WAS H E R- P R M I ER

513

OR

A/C COMPRESSOR/REFRIGE RANT PRESS. SW

515

GY

BLOW ER MOTOR (HI)

BU

BasicMachineCircuits STARTERNO.1SOL

302

OR

STARTERNO.1RESIS TORTO DIAGNOSTIC

516

GN

30 4

WH

ST AR TE RR EL AY N O. 1O UT PU T

5 17

BU

306

GN

STARTERRELAY COIL TO NEUT STARTSWOR KEY S W

521

301

YL

BLOW ER MOTOR (MEDIUM)

6 C ontacts 5Contacts

E-4 E-4 E-5 C-7 C-8  A-5

4Contacts

C-2 C-2 F-4 F-4

Machine Location HarnessAnd/OrComponents K - 120-6547 PrelubeTi mer/Solenoid *  A-6Y-4522 E - 6Y-4523 D  A-6Y-4522 M - 61-8611 B  A-6Y-4522 B - 127-5121 B  A-6Y-4522 H - 9N-4596 4  A-6Y-4522 N - 9W-1816 B  A-6Y-4522 MM - 127-5120 B  A-6Y-4522 Ripper Pin Puller Solenoid * MM - 127-5120 LeftWiperMotor  * MM - 127-5120 FrontWiperMotor  * MM - 127-5120 RightWiperMotor  * NN - 9U-9463 RearWiperMotor  *

Schematic Location

Harness And Wire Electrical Schematic Symbols

Electrical Schematic Symbols And Definitions

D-2

 A

AA

1 2

1

 A-7

C-5 E-7

T

Pressure Symbol

Temperature Symbol

Receptacle

Plug

Level Symbol

Flow Symbol

1 2

Typicalrepresentationofa Deutschconnector.The plug contains allsockets andthereceptaclecontains all pins.

 A-5

2

Typicalrepresentation ofa Sure-Sealconnector.The plugand receptacle contain bothpinsandsockets.

E-4

Pin orSocket Number 

E-4 C-9 E-5

Wire,Cable,orHarness  Assembly Identification

Normally open switch thatwill close with an increase of a specific condition (temp-press-etc.).

B-6

Component PartNumber 

SingleWire Connector 

B-4

Normally open switch thatis closed due to an applied condition,and will open again with a specific decrease in thatcondition.

C

 A

 A 325-PK-14

AA 1

9X-1123 325-PK-14

D-8

Pin

B= Compone ntslocatedindash nts

Wire Color 

Socket

2

E = Componentslocatedo n relaypanel

Normally closed switch thatis open due to an applied condition,and will close again with a specific decrease in that condition.

200-BK-14

CircuitNumber  Identification

Wire Gauge

OFFMACHINESWITCHSPECIFICATIONS

3T-5825 PowerTra i nOilTemp(EMS) inOilTemp(EM

Actuate 362 ±29 mN (1.3±0.1oz) 129.4±2.8°C (265.0±5.0°F)

Deactuate 303mNMIN (1.1ozMIN) 118.3°C (245.0°F)

Normal Condition Normally Open Normally Closed

6T-4949

93.0 ±21.0 kPa (13.5±3.0psi)

Part N o.

Function

3E-2030 EngineCoolantFlow(EMS)

69.0 ±21.0 kPa (10.0±3.0psi)

Normally Open

8C-3569 HydraulicOilFilterTemp (EMS)

107.2±2.8°C (225.0±5.0°F) 37.8±2.8°C (100.0±5.0°F)

91.0°CMIN (196.0°FMIN) 26.7°CMIN (81.0°F)

Normally Closed Normally Closed

8N-1693 EngineCoolantTemp (StAid)

37.8±2.8°C (100.0±5.0°F)

26.7°CMIN (80.0°F)

Normally Closed

EngineOilPressure(EMS)

7N-9785 EngineCoolantTemp(EMS)

BL O WE RM OT OR ( LO ) A/CSW TO REFRIGERANTSW

Connectors

Normally closed switch thatwill open with an increase of a specific condition.

W I PE R- F R ON T ( L O )

502

MAINCHASS IS OPRMONPANEL VMISCMS

203 2 07

F-8 C-6

D = Compone ntslocatedinoperator'srightconsole ntslocatedin

PRELUBE OIL PRESS Accessor yCircuits WIPER - FRONT (PARK)

Schematic Location

Printed in U.S.A.

ElectricalSchematicSymbols And Definitions

The circle indicates thatthe component has screw terminals and a wire can be disconnected fromit.

FUSE -A componentin an electrical circuitthatwill open thecircuitif toomuch currentflows throughit.

No circle indicates thatthe wire cannotbe disconnected fromt he component.

This indicates thatthe componenthas a wire connected to it thatis connected to ground.

REEDSWITCH -A switch whose contacts are controlled by a magnet.A magnetcloses the contacts ofa normally open reed switch;it opens the contacts ofa normally closed reed switch.

T

SENDER -A componentthatis used with a temperature orpressure gauge.The sender  measures the temperature orpressure. Its resistance changes to give an indication to the gaugeofthetemperatureorpressure.