DIAGRAMA D6H

SENR4955 February 1993 7

3

Off Machine Switch Specification Part No.

Actuate

Deactuate

Contact Position

3T5825

PowerTrainOilTemperature(EMS)

129.4±2.8°C (265±5°F)

118.3°CMIN (245°FMIN)

NormallyClosed

7N9785

EngineCoolantTemperatur r ature(EMS) e (EMS)

Function

107.2±2.8°C (225±5°F)

91.0°CMIN (196°FMIN)

NormallyClosed

7T0988

EngineOilPressure(EMS)

62 ± 21 kPa (9.0±3.0psi)

38 ± 21 kPa (5.0±3.0psi)

NormallyOpen

8N1693

EngineCoolantTemperatur r ature(StartAi e (StartAid)

37.8±2.8°C (100±5°F)

26.7°CMIN (80°FMIN)

NormallyClosed

8N2248

HydraulicOilTemperature (DifferentialSteerEMS)

101.7±2.8°C (215±5°F)

93.3°CMIN (200°FMIN)

NormallyClosed

B 14

C 1

12

18

4

15

9

8 10

 A

D 19

17 5

16

2

13

6

2

1

11

8T8639

RefrigerantPressure(A/C)

344.5±34.5 kPa (50±5psi)

172.3 ± 21 kPa (25±3psi)

NormallyOpen

9G1300

HydraulicOilTemperature (Clutch/BrakeSteerEMS)

110.0±2.8°C (230±5.0°F)

101.7°CMIN (215°FMIN)

NormallyClosed

9G3341

PowerTrainOilTemperature (Clutch/BrakeSteerEMS)

51.7±2.8°C (125±5°F)

43.0°CMIN (110°FMIN)

NormallyClosed

93 ± 21 kPa (13.5±3.0psi)

69 ± 21 kPa (10.0±3.0psi)

NormallyClosed

210 ± 70 kPa (30±10psi)

— —

NormallyOpen

9W3187

FuelPressure(EM s sure(EMS)

9X7781

PowerTrainFilterPressure (EMS) (DifferentialSteerEMS)

D6H Series II Tractor  Electrical System

D

Resistor,Senderand SolenoidSpecifications Part No.

 A

10

8

16 7

4

11

C

5 3

B

Resistor - Blower Motor Speed

9 G1 95 0

R es s i o t r - Bl ow er M ot or S pe ed

7X6416

Resistor - Load

6T2217

Resistor - Starter/Diagnostic Conn

8T8813

Solenoid - A/C Clutch

9G4365

Solenoid - Start Aid

Resistance O ( hms)¹ 5 Overall2.0±.1 Tap1.0±.05 50 ± 5.0 150 ± 7.5 14.4 ± 0.6 6

¹ Atroomtemperatureunlessotherwisenoted.

2

1

Component Description

2G0413

2

18 1

9 17

14

15 12

19

13

RelatedElectricalService Manuals

6

Title

FormNumber 

 Alternator(1005047): ConsistNo.1005046

SENR2082

ConsistNo.1005045

SENR4130

ElectronicMonitoringSystem

SENR2945

StartingAndChargingSystems

SENR2947

4RC5500-UP 6FC5500-UP 8FC5500-UP 1KD5500-UP 2KD5500-UP 3ED5500-UP 3ZF5500-UP 4YF5500-UP 5HF5500-UP 6CF5500-UP 6CF5500-UP 2TG5500-UP

3YG5500-UP 4GG5500-UP 4LG5500-UP 1FJ5500-UP 8ZHJ1-UP 9KJ1-UP 2DK5500-UP 5KK1-UP 6CK1-UP 7ZK1-UP 8KK1-UP

8SK1-UP 9LK1-UP 9RK1-UP 1YL1-UP 2BL1-UP 2TL1-UP

StartingMotor(4N3181):

Machine Harness Connector And Component Locations

ConsistNo.8C3651(42-MT)

SENR3581

ConsistNo.9X4447(F8)

SENR4975

ConsistNo.3T6305(KE)

SENR3536

©1993 Caterpillar   All Rights Reserved

Schematic Location D-8

Machine Location 1

 Alarm - Backup

E-9

 Alternator

B-1

Batteries

F-3

3

Breaker -A -Alternator 6 ( 0A)

E-7

B

Breaker - Blower M otor

Schematic Location A-6

Machine Location 11

C

Sender-Power TrainOilTemp(Gauge)

B-2

12

2

Solenoid-A/CClutch

B-2

13

Solenoid - Start Aid

F-2

14

Switch - Backup Alarm (CBS)

D-7

C

E-7

C¹

Converter - Voltage

E-3

C

Switch - Blower Motor (A/C)

B-3

A

Filter -A -Alternator

B-5

A

Switch - Blower Motor (Heater)

C-3

5

Fuse - Front Dash and Dome (10A)

E-7

B

Switch - Disconnect Sw

F-3

3

Fuse - Key (10A)

F-7

B

Switch - Engine Coolant Temp (EMS)

C-2

9

Fuses Gauges Ground - Module

F-5

Component Sender-Hydraulic OilTemp(Gauge)

E-6 B-5 D-4

B

B A A

Horns - Front

F-1

4

Lamp - Action (EMS)

D-6

A

Switch - Backup Alarm (DS)

Switch - Engine Coolant Temp (Start Aid)

D-2

9

Switch - Engine Oil Pressure (EMS)

C-2

15

Switch - Flood Lamp Sw

B-6

A

Switch - Forward Horn

B-6

16

Switch - Front and Dash Lamp

C-6

A

Connector 

Machine Location

HarnessAnd/Or  Components

Schematic Location

*

 A-6Y7376 OperatorMonitor(EMS)

E-4

B

 A-6Y7376 DiagnosticConnector 

F-7

20Contacts

9Contacts

8Contacts

7Contacts

 A

 A-6Y7376 C-7T8326

D-6

Wire Wire Number  Color 

G-9U9458 Attachment H-9U9463 Attachment

C-7

D¹

G-9U9458 Attachment H-9U9463 Attachment

C-B

D¹

G - 9U9458  AttachmentRadio

B-4

1

 A-6Y7376 B-1011339

E-3

1

 A-6Y7376 B-1011339

D-3

B-5

A

Switch - Fuel Press (EMS)

C-2

17

Monitor -O -Operator (EMS)

D-4

A

Switch -H -Hydraulic Oil Temp (EMS)

A-6

11

Motor - Blower (Heater)

B-3

5

Switch - Key Start

C-5

A

6

Switch - Neutral Start (DD)

Motor - Starting

B-9

18

Sw ti ch - Ne u ta r l St Sta tr (PS wi ht DS DS)

D- 7

C ¹

Motors -B -Blower (A/C)

B-3, C-3

8

Switch -N -Neutral Start P ( S with CBS)

D-7

C

Mot or ss- Wi Wip er (F (Fr on t& Le Lef )t

C4 - ,E- 7

D

Sw ti ch - Po wer Tr Tr ai nF nFi tl er Pr Pr es s( s( DS EMS)

A- 6

11

Mot or ss- Wi Wip er (R (R ear & Ri gh )t

C8 - ,B- 6

D

Sw tic hh- Po we rT rTr ai nO nOi lTe m p (C (C B S E MS)

C- 2

19

B-4

D¹

Switch - Power Train Oil Temp (EMS)

C-2

12

Mot or - W ni d sh ei l dW as he r

Radios 1 ( 2V & 24V)

A-2 A- 8

7

Relay - Main (Replaces Terminal Block)

F-8

B

Switch -R Sw -Refrigerant Press

Relay - Start

F-6

B

Switch - Start Aid

Resistor - Blower Motor Speed (A/C)

B-3

8

Switch - Test (EMS)

Resistor -B -Blower Motor Speed (Heater) Resistor -L -Load

B-3

5

Switch -T -Thermostat (A/C)

F-6

B

Switches - Wiper

6

T er mi na lB ol ck

R es si ot r -S -S at rt er to to D ai gn os it c Co nn ec ot r

B2 -

Sen der - En gin eC eC ool ant Te m p (G (G a u ge)

C2 -

9

Sender - Fuel (Gauge)

D-9

10

F-2 C-6 D-6

13

6Contacts

2

 A-6Y7376 E- 9U9407

 A-5

*

 A-6Y7376 VoltageConverter 

E-3

5Contacts

HD LMP K E YS W

108

BU

 AUX CKT

109

OR

 ALT OUTPUT(+) TERM.

112

PU

M A I NP O W E R R EA LY O UTPUT

113

OR

OPR MON PANEL B+ SWITCHED

114

GN

WARNING HORN (FORWARD)

BACKUP ALARM TO LAMP  AUX CKT

GN

 A/C

BU

 AUX CKT GroundCircuits

200

BK

MAIN CHASSIS

201

BK

OPR MON PANEL CMS

B-5

D-5

 A

 A-6Y7376 G-9U9458 Attachment

4Contacts

 A

A A

B-3

A

B-7, B-8

D ¹

F -6

B

D-6

 A

 A-6Y7376 N-9W1816 Attachment  A-6Y7376 Y-6Y3416 Attachment

Machinelocations arerepeatedfor connectorslocated closetogether. *= Connec tor is locatedatthecomponent. n t.  A= Connectorindash area. B= Connector atrelaypanel. D¹= Connectorinheadliner ofoperatorscompartment.

C-3

C-3

Machinelocationsarerepeatedfor componentslocatedclose

E MS = E l ec t o r nci M o ni t or i ng S y st e m (o p er a ot r m on i ot r )

t o ge t he r .

DS = Dif ef e r n t ai lSte er Ma ch ni es

A = Comp one nts in da da sh ar ar ea .

CBS = Cl ut ch/ Br ak eS eSte er Ma ch ni es

B = Co m p one nts at at re rel ay pa pa n e .l

PS =P =Power Shift PT = Po w e rT rT a ri n

C =C =Components ni operator's el ft console. C ¹ = Co m p one nts wi wi ht ni di di ff st ste er co co n to r l ha ha n d el of op op e r ato 'r sl sle tf console. D= Componentsinoperatorcompartment.

CHASSIS DIAGNOSTIC STARTER DIAGNOSTIC

 A

AA

1 2

1

2

T

Pressure Symbol

Temperature Symbol

Level Symbol

Flow Symbol

STARTER NO.1 SOL STARTER NO.1 RESISTOR TO DIAGNOSTIC

WH

STARTER RELAY NO.1 OUTPUT

GN

START E R R EA L Y C O I LT O N E U T S T A R TS W

307

OR

MAIN POWER RELAY COIL

PU

S T A R TA I D S WT O S T A R T A I DS O L

311

WH

START AID SOL TO TEMP SW

321

BR

322

GY

W A R NNI G H O R N( F O R W R AD)

403

GN

 ALTERNATOR (R) TERM.

YL

O P RM O N H Y D OI L T E MP

Wire, Cable,or Harness  Assembly Identification

BCKP ALARM LAMP

405

GY

406

PU

OPR MON COOLANT TEMP

OPR MON OIL PRESS. (LO SETTING)

410

WH

O P RM O N C A T I O NA L A R M

411

PK

OPR MON ACTION LAMP

413

BR

OPR MON FUEL PRESS.

415

GN

O P RM O NT E S T SW

424

GY

OPR MON POWER TRAIN TEMP

426

BR

441

OR

442

GY

OPR MON POWER TRAIN OIL FILTER

POWER TRAIN TEMP GAGE F U E LL E V E L GAGE AccessoryCircuits

500

BR

WIPER - FRONT (PARK)

501

GN

WIPER-FRONT(LO)

504 505

OR

WIPER-FRONT (HI)

BR

WIPER - REAR (PARK)

YL

WIPER - REAR (LO)

BU

WIPER - REAR (HI)

508

PU

RADIO SPEAKER - LEFT

509

WH

RADIO SPEAKER - LEFT (COMMON)

510

YL

WASHER - PRIMER

511

BR

RADIO SPEAKER - RIGHT

512

GN

RADIO SPEAKER - RIGHT (COMMON)

513

OR

 A/C COMPRESSOR/REFRIGERANT PRESS. SW

515

GY

BLOWER MOTOR (HI)

516

GN

BLOWER MOTOR (MEDIUM)

AA 1

9X-1123 325-PK-14

Wire Color 

Socket

2

Normally closed switch thatwill open with an increase ofa specific condition.

200-BK-14

CircuitNumber  Identification

Normallyclosed switch thatis open due to an applied condition, and will close again with a specificdecrease in thatcondition.

Wire Gauge

ElectricalSchematicSymbolsAnd Definitions FUSE -A component inan electrical circuitthat willopen thecircuitif too much current flows through it.

HYD SYSTEM TEMP GAGE

YL PK

503

 A

 A 325-PK-14

Pin

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

E N GC O L A N T T E MP G A G E

443 447

Component Part Number 

Single Wire Connector  C

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

MonitoringCircuits

404

Typicalrepresentation ofa Sure-Sealconnector.The plugandreceptacle contain both pins and sockets.

Pin or Socket Number 

KEY SW TO NEUT START SW

YL

310

1 2

Typicalrepresentation ofa Deutsch connector.The plug contains allsockets and the receptacle contains allpins.

Receptacle

Plug

BasicMachineCircuits BU OR

304

502

 A/C=Air Conditioning

BK BK

302

308

 A-6Y7376 C-7T8326

Electrical Schematic Symbols And Definitions

A U XC K T

YL WH

124 129

301

 A-6Y7376 M-6I8611

BR

121 123

203

 A

BAT

BU BR

207

 A

RD

102 105

116

D¹

Description PowerCircuits

101

306

Meter - Service

Harness And Wire Electrical Schematic Symbols

WireDescription

HarnessConnectorLocationChart

ComponentLocation Component  Alarm-Action(EMS)

Printed in U.S.A.

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

REED SWITCH -A switch whose contactsare controlled by amagnet. Amagnet closes the contacts ofa normally open reed switch;it opens the contacts of a normally closed reed switch.

No circle indicatesthatthe wire cannotbe disconnected fromthe component. T

Thisindicates thatthe componenthas a wire connected to itthat is connected to ground.

SENDER -A componentthat is used with a temperature or pressuregauge. The sender  measures the temperature or pressure. Its resistance changes to give an indication to the gauge of the temperature or pressure.

RELAY(MagneticSwitch) - Arelayis an electrical componentthat is activated by electricity. It has a coil thatmakes an electromagnetwhen current flows through it. The electromagnet can open orclose the switch partof the relay.