Cat 416C 426C & 436C Backhoe Loader Electrical System Schematic Manual - PDF DOWNLOAD

Page 1

J-18

9

CONN 2

J-17

9

CONN 3

L-17

CONN 4 CONN 5 Code

CONN 7

Machine Location

Action - Lightbar

F-5

B

Solenoid - Engine Shutdown

Alarm - Backup

D-18

1

Solenoid - First and Second Gear

A

Alarm - Light Bar

D-16

A

Solenoid - Front Drive

L-17

9

Alternator

E-3

2

Solenoid - Fuel Shutdown

I-4

7

J-15

A

Assembly - Fan

E-17

3

Solenoid - Group A (Forward High and Low)

I-13

G

L-15

4

G

B-14

A

CONN 8

B-14,L-10

A

CONN 9

C-14

A

CONN 10

C-14

A

CONN 11

C-14

A

CONN 12

I-14

G

CONN 13

K-14

25

CONN 14

K-14

25

CONN 15

Data Link

Component

L-15

4

CONN 16

C-13

C

10

CONN 17

D-13,K-2

C

9

CONN 18

J-13

3

CONN 19

J-13

3

CONN 20

D-11

3

18 16 7

24

C

E

1

12 5 11

8

2

6

G

20

22

23

15

17

3

B

D

F

21

19

F-3

17

H-13

G

F-3,I-5

G

C-3

4

Solenoid - Group B (Third and Fourth Gear)

I-13

Breaker - Running Lamp

F-10

A

Solenoid - Left Steer

K-9

7

Coil - Forward Solenoid

G-3

G

Solenoid - Loader Lock LH

I-7

18

Coil - Reverse Solenoid

F-3

G

Solenoid - Loader Lock RH

I-7

19

E-3,J-4

5

Solenoid - Lock

L-9

7

L-12

4

Solenoid - Reverse

I-13

G

Control - Shuttle

E-8

D

Solenoid - Right Steer

K-9

7

Control - Shuttle (Powershift)

K-13

D

Solenoid - Shutoff

K-9

7

Control - Powershift

25

Machine Location

Batteries

Coil - Thermostart

13

Component

Schematic Location

Flasher

F-10

B

Solenoid - Valve Group A

G-1

8

Fuses

F-11

D

Switch - Air Conditioning Blower

K-16

A

Fuses

F-14

C

Switch - Aux Coupler

C-6

B

Fuses

K-3

C

Switch - Aux Rear Flood

G-13

C

Gauge - AWS Position

L-5

B

Switch - AWD

E-6

B

Gauge - Converter Temperature

A-15

A

Switch - AWS Mode Select

L-5

B

Gauge - Coolant Temperature

B-17

A

Switch - AWS Pressure

K-8

20

Gauge - Fuel Level

B-16

A

Switch - Backhoe Shutoff

H-12

A

D-11

3

Ground - Engine

G-3

6

Switch - Beacon

E-12

C

CONN 22

B-10,K-2

C

Ground - Headliner

C-12

C

Switch - Brake A

D-8

E

3

Ground - Platform

B-14

7

Switch - Brake B

D-8

E

Ground - Steer Column

E-10

3

Switch - Brake Fluid Level

C-4

21

D-10

CONN 24

D-10

3

CONN 25

H-9

A

CONN 29

F-7

CONN 30

F-7

4

B B

CONN 31

F-7

B

CONN 32

I-7

1 9

CONN 33

J-7

3

CONN 34

K-7

7

CONN 35

K-7

3

CONN 36

K-7

3

CONN 37

D-5,H-6

6

CONN 38

D-5,I-6

6

CONN 39

C-5,I-6

6

CONN 40

B-5

3

CONN 41

B-5

6

CONN 42

K-5

3

CONN 43

K-5

3

C

10 E

B

21

D

Horn - Forward

B-3

8

Switch - Cold Start Temperature

Horn - Rear

H-7

1

Switch - Coolant Temperature

H-4

12

F-3,H-4

Junction - Power

D-9

3

12

Switch - Coupler

D-6

Meter - Service

D-14

B

A

Switch - Coupler Detent

A-15

A

Motor - Air Conditioning Blower Motor - Front Wiper

K-18

9

Switch - Engine Oil Pressure

F-3,H-5

22

G-5

C

Switch - Fog Lamp

K-17

A

Motor - Heater Blower

D-17

A

Switch - Front Flood

F-12

C

Motor - Rear Wiper

E-17

10

Switch - Front Flood

G-12

C

Motor - Starter

D-3

11

Switch - Front Flood OROPS

L-1

C

Power Port

D-14

A

Switch - Front Wiper

E-12

C

Radio

H-16

C

Switch - Hazard

F-9

D

Relay - Accessory 19 18

A

12 3

F

11

G 25

1

20

7

16

13

6

5

14

8

17 22

2

15

23

G-13

C

F-9

B

Switch - Heater

A-14

B

Relay - Cab

E-9

D

Switch - Horn

C-6

B

Relay - Left Steer

K-4

B

Switch - Loader Lock

J-7

1

Relay - Loader Lock

J-9

A

Switch - Loader Transmission Neutral

E-5

G

Relay - Park Brake

4

B

Switch - Head Flood Atch

Relay - Air Conditioning

Relay - Main

24

F-6

F-9

D

Switch - OROPS Aux Front Flood

L-1

C

K-15

A

Switch - OROPS Beacon

K-1

C B

CONN 44

B-3

6

CONN 45

F-1

8

Relay - Right Steer

K-4

B

Switch - Overdrive Disable

J-11

8

Relay - Seat

L-10

F

Switch - Park Brake

B-8

A

Relay - Shutoff

K-4

B

Switch - Rear Floods

F-12

C

Relay - Start

E-9

D

Switch - Rear Horn

H-9

A

CONN 46

G-1

¹ The connectors shown in this chart are 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.

Machine Harness Connector and Component Locations

Resistor - Air Conditioning

K-18

A

Switch - Rear Wiper

D-12

E

Resistor - Heater

E-16

A

Switch - Refrigerant

J-16

23

Resistor - Powershift

I-9

B

Switch - Return To Dig

L-16

13

Sender - Converter Temperature

G-3,I-5

6

Switch - Rear Steer

K-8

B

Sender - Coolant Temperature

E-3,I-4

12

Switch - Seat

K-9

F

Sender - Fuel Level

G-4,H-5

13

Switch - Start

D-14

A A

Sensor - Rear Steer Position

J-9

7

Switch - Start Aid

D-14

Sensor - RTD

L-17

14

Switch - Thermostat

J-18

9

Sensor - Speed

H-13

G

Switch - Transmission Neutral

D-4

24

Solenoid - Air Conditioning Clutch

J-16

15

Switch - Transmission Neutral

I-5

24

Solenoid - Aux Detent

A-6

16

Switch - Transmission Neutral

L-8

24

Solenoid - Backhoe Shutoff Valve

H-11

1

Switch - Transmission Neutral Lock

D-6

B

A-4

16

Switch - Turn Signal

E-5

B

Solenoid - Bucket Position

Diagnostic Code Conversion for Power Shift Control Code Flashed 11 12

CID - FMI No ACTIVE Faults

Title

Not applicable.

Form No.

Powershift Transmission Control

SENR1274

Starting Motor: 143-0539

SENR3828

Solenoid - Circle Steer

L-9

7

Switch - OROPS Rear Floods

K-1

C

Solenoid - Cold Start Advance

H-5

12

Tachometer

B-17

A

Machine locations are repeated for components located close together A = Operator Compartment - Right Console B = Operator Compartment - Front Console C = Operator Compartment - Overhead Console D = Operator Compartment - Steering Column Top Panel E = Operator Compartment F = Inside Seat Assembly G = Under Cab Floorplate

Related Electrical Service Manuals

Description

-

416C

14

-

426C

15

-

428C

16

-

436C

17

-

438C

18

-

BHL

31

641 - 05

Forward High Solenoid Open Circuit

32

642 - 05

Reverse Solenoid Open Circuit

33

643 - 05

Forward Low Solenoid Open Circuit

34

644 - 05

Speed 1 Solenoid Open Circuit

35

645 - 05

Speed 2 Solenoid Open Circuit

36

646 - 05

Speed 3 Solenoid Open Circuit

38

683 - 05

Parking Brake Alarm Open Circuit

41

641 - 06

Forward High Solenoid Short to Ground

42

642 - 06

Reverse Solenoid Short to Ground

43

643 - 06

Forward Low Solenoid Short to Ground

44

644 - 06

Speed 1 Solenoid Short to Ground

45

645 - 06

Speed 2 Solenoid Short to Ground

46

646 - 06

Speed 3 Solenoid Short to Ground

48

683 - 06

Parking Brake Alarm Short to Ground

51

641 - 03

Forward High Solenoid Short to Battery

52

642 - 03

Reverse Solenoid Short to Battery

53

643 - 03

Forward Low Solenoid Short to Battery

Part No.

Component

54

644 - 03

Speed 1 Solenoid Short to Battery

3E-1908

55

645 - 03

Speed 2 Solenoid Short to Battery

3E-6184

Resistor - Powershift

56

646 - 03

Speed 3 Solenoid Short to Battery

3E-8620

Solenoid - Auxiliary Detent

3.5 ± .15 100 ± 5

683 - 03

Parking Brake Alarm Short to Battery

62

191 - 02

Transmission Speed Sensor

63

668 - 02

Invalid Shift Lever Input

Shutoff

64

168 - 00

Battery Voltage Above Normal

Valve Group A

65

168 - 01

Battery Voltage Below Normal

66

650 - 02

Invalid Harness Code Input

73

590 - 02

Trans Configuration Incorrect

3E-8622

4W-9972

Solenoid - Sideshift Lock

Sender - Converter Temperature

Sender - Coolant Temperature

Detected Faults For Shift Lever Control CID No. / FMI No.

113-5320

Description

FMI 01

System voltage above normal. System voltage below normal.

Loader Lock RH

110°C (230°F) - 72 to 82 8.5

Right Steer 121-4036

Solenoid - First and Second Gear

10.5

Front Drive

CID 668 - Transmission Shift Lever: FMI 12 Shift lever bad device or component. Note: The CID-FMI diagnostic codes for the Shift Lever Control are accessed by the ET or ECAP service tool only.

54°C (130°F) - 560 to 716

Left Steer

CID 168 - Electrical System: FMI 00

Solenoid - Loader Lock LH

Solenoid - Circle Steer

128-2875

Sender - Fuel Level Empty:

240 - 260

Full:

27.5 - 39.5

129-4531

Solenoid - Lock

134-2885

Resistor - Air Conditioner

10.5 Overall 1.0 ± 0.1 Tap 0.5 ± 0.05

Heater 138-1976 ¹ At room temperature.

Solenoid - Hydraulic Shutoff

6T-2665

Engine Coolant Temperature

9X-5446

Thermostat

114-5333

Refrigerant Pressure (AC)

54°C (130°F) - 560 to 716 110°C (230°F) - 72 to 82

8C-5541

Function

54°C (130°F) - 560 to 716 110°C (230°F) - 72 to 82

7N-8532

Off Machine Switch Specification Part No.

10.5

8.15 ± 0.6

416C, 426C, and 436C Backhoe Loader Electrical System 416C: 4ZN5635-16043 1AR649-UP 1KR416-UP 1WR2947-8115

128-5091

AWS Pressure

Actuate

Deactuate

Contact Position

107.2 ± 2.8ºC

93ºC MIN

Normally Open

(225 ± 5ºF)

(196ºF MIN)

.25Nm to .43Nm

--

(.19 lb ft to .32 lb ft)

--

275 to 1750 kpa¹

--

(40 to 255 psi)

--

Normally Open

Normally Open²

551 kPa

344 kPa ± 20 kPa

A-C Normally Closed

(36.3 psi)

(49.9 psi ± 2.9 psi)

A-B Normally Open

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 (25 psi). ² Contact position at the contacts of the harness connector.

426C: 6XN1245-3615 1CR364-863 1MR456-955 1YR517-1516

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.

436C: 8TN391-924 1FR416-1415 1PR598-1598 2AR604-1603

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.

Printed in U.S.A.

© 1998 Caterpillar All Rights Reserved

200 201 202 217 218 265 270 276 277 278 279 280 281

32.1

Bucket Position

58

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

101 102 104 105 110 111 112 113 115 116 117 118 119 121 122 123 124 128 130 136 140 143 144 157 161 170 194 197 198

Resistance (Ohms)¹

Solenoid - A/C Compressor Clutch

Flow Symbol

Level Symbol

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

Harness And Wire Electrical Schematic Symbols

Wire Description

Resistor, Sender, and Solenoid Specifications

Temperature Symbol

Pressure Symbol

Wire Number

No INACTIVE Not applicable. Faults

13

T

14

A

CONN 21

CONN 23

Electrical Schematic Symbols And Definitions

303 304 306 307 308 309 310 321 322 334 367 405 406 419 429 441 443 447 450 483 500 501 502 503 504 505 506 507 508 509 511 512 513 515 516

Wire Color

Description

Power Distribution Circuits RD Bat (+) RD Running Lamp Pwr YL Acc Rly Output RD Key Sw Pwr RD Horn Pwr YL Acc Bat Pwr PU Main Power Rly Output OR Opr Mon Panel Pwr RD Acc Socket Pwr BR Std Rear Flood Pwr YL Aux Rear Flood Pwr GY Front Wiper Pwr PK Rear Wiper Pwr YL Back Alarm Pwr BU Heater Pwr WH XMSN Ctrl Pwr GN A/C Pwr PK Bucket Position Pwr GN Radio Pwr GN Suppl Steer Pwr BU Blower Pwr BR AWD Pwr GN Beacon Pwr YL Aux Front Flood Pwr RD Flasher Pwr RD Radio Memory Pwr GN Cab Bat Pwr GN Cab Relay Output PK A/C Relay Output Ground Circuits BK Main Chassis BK Operator Monitor return BK XMSN Ctrl Gnd BK Start relay return BK Drop valve relay return BK Loader Lock Gnd BK Loader Lock Gnd BK Pshift Ctrl Harn Code 0 BK Pshift Ctrl Harn Code 1 BK Pshift Ctrl Harn Code 2 BK Pshift Ctrl Harn Code 3 BK Pshift Ctrl Harn Code 4 BK Pshift Ctrl Harn Code 5 Basic Machine Circuits BR Key SW ACC Position WH Start Relay Output GN Starter Relay Coil OR Key Sw Start Position YL Key Sw Run Position GY Alternator Regulator Term. PU Start Aid Sol BR Backup Alarm GY Forward Horn BU Cold Start Adv Sol BU Rear Horn Monitoring Circuits GY Opr Mon Oil Press. (Low Setting) PU Opr Mon Coolant Temp YL Opr Mon Parking Brake YL AWS Position Gage OR Eng Coolant Temp Gage YL Converter Temp Gage PK Fuel Level Gage YL Tach Sender (+) BR Opr Mon Brake Fluid Level Accessory Circuits BR Wiper - Front (Park) GN Wiper - Front (Low) OR Wiper - Front (HI) BR Wiper - Rear (Park) YL Wiper - Rear (Low) BU Wiper - Rear (HI) PU Washer - Front WH Washer - Rear PU Radio Speaker - Left WH Radio Speaker - Left (Common) BR Radio Speaker - Right GN Radio Speaker - Right (Common) OR A/C Compressor/Refrigerant Pressure SW GY Blower Motor (HI) GN Blower Motor (Medium)

Wire Number 517 520 521 522 536 537 552 568 578 C558 C559 C593 C594 C595 602 603 604 605 606 607 608 610 611 614 617 618 619 620 627 630 634 710 752 754 755 762 766 779 C720 E764 F765 G726 G742 G743 G789 G795 G796 G797 G798 H767 H768 H769 H770 H771 H772 F871 F872 F873 F874 F877 922 923 944 945 975 991 C920 C993 L998 L999 M913 M968 N904 N905 N907 P909 R977 R978

Wire Color

Description

Accessory Circuits (cont'd) BU Blower Motor (Low) WH Opr A/C SW To Thermostat/Fuse YL A/C SW To Refrigerant SW WH A/C Clutch To Thermostat SW WH Hazard SW To Turn SW GN Turn Signal SW To Flasher WH Four Wheel Drive Sol GN Park Brake Alarm Sig BU Washer - Aux YL Front Wiper Switch Jumper YL Rear Wiper Switch Jumper OR Power Seat Relay Control YL Power Seat Motor GN Power Seat Heater Lighting Circuits RD Dome Lamp Pwr PK Rotary Beacon OR Stop Lamp YL Turn Lamp - Left GY Turn Lamp - Right PK Flood Lamp - Front GN Flood Lamp - Rear OR Head Lamp Basic PU Head Lamp Hi PU Park/Tail/Dash/Lamp BR Tail/Position Lamp - Left YL Tail/Position Lamp - Right GN Headlamp low WH Flood Lamp - Front (Attach) YL Fog Lamp GY Flood Lamp Rear (Attach) WH Head Lamp SW To Work/Head Lamp Jumper Control Circuits GN XMSN Speed Pickup Signal YL XMSN Shift Sol 1st and 2nd Gear BU XMSN Shift Sol 3rd Gear OR XMSN Shift Sol 4th Gear YL Bucket Positioner Sol GN XMSN Disconnect SW WH Coupler Engage Sol BU XMSN Neutral Lock Sig OR AWS Circle Steer/Lock Sol BR Park Brake SW To Relay GY AWS Shut Off Sol GN AWS Relay Coil to Diode OR AWS Relay Coil to Diode BR AWS Mode SW To Press SW OR AWS Mode SW To Rear Steer SW Pwr YL AWS Mode SW To Rear Steer SW Gnd BU AWS Left Steer Relay Gnd PU AWS Right Steer Relay Gnd BR AWS Circle Steer/Lock Sol Gnd BR AWS Left Steer Sol Gnd BR AWS Right Steer Sol Gnd BR AWS Shut Off Sol Gnd BR Side Shift Lock Sol YL Backhoe Shutoff Sol PU AWS Left Steer Sol BU AWS Right Steer Sol YL Relay Contact To Diode As PK AWS Left Steer Relay Ctrl WH AWS Right Steer Relay Ctrl BR FWD Solenoid Rtn GY REV Sol Rtn OR Data Link + (CAT) BR Data Link - (CAT) WH Powershift - Sol Return WH XMSN Neut SW GY Diagnostic Indicator - Powershift WH Shuttle Ctrl Pwr OR Aux Hyd Sol B GN Aux Hyd Sol C PU Diode to AWS Indicator Lamp BU Coupler Switch Interconnect PU Forward High Solenoid OR Forward Low Solenoid GN Reverse Low Solenoid PK Autoshift Disable BU Stabilizer leg sw YL Shuttle control jumper

Typical representation of a Sure-Seal connector. The plug and receptacle contain both pins and sockets.

Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.

L-C12 * 3E-5179

AG-C4 * 111-7898

1 2

1 2

Part Numbers For Connector Assembly

1

Receptacle

Plug

Component Part Number

2 Wire, Cable, or Harness Assembly Identification

Pin or Socket Number

* C-C4* AG-C3 130-6795 130-6795 325-A135 PK-14 Pin

L-C12* 3E-5179

AG-C4* 111-7898

9X-1123

1

Harness identification code This example indicates wire 32 in harness "L'.

2

200-L32 BK-14

Socket

Single Wire Connector * Harness identification letter(s) and a serializing code. The "C" stands for connector and the number indicates which connector in the harness.

Circuit Number Identification

Wire Color

Wire Gauge

Electrical Schematic Symbols And Definitions 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.

T

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.

20 Page

CONN 1

Schematic Location

SENR1276-02

Machine Location

CONN 6

SENR1276-02 January 1998

Component Location

Schematic Location

325-L25 PK-14

Connector Location¹ Connector Number


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