section 55 - electrical chapter 1 -- electrical

SECTION 55 -- ELECTRICAL -- CHAPTER 1

55-1

SECTION 55 - ELECTRICAL

Chapter 1 -- Electrical

CONTENTS

Section Description Page

Bolt Torque Specifications 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55 100 Description of Operation 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Component Location and Function 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55 100 Wiring Harnesses 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Grounds 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical System Components 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Battery 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Checking the Electrolyte Level 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Main Fuse 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replacement 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuse Block 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Key Switch 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Terminal Identification 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Stop Position (Not Shown) 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Heat/ Accessory/ Run Position 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Start Position 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Light Switch (Road Lights) 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Terminal Identification and Testing 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Work Light Switch 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Forward Position �On� 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55 404 Headlight 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replacement 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55 404 Taillight 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hazard Light Switch 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


55-2


Testing 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

�Off� Position 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

�On� Position 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55 408 Transmission Range Safety Switch (HST and Gear) 25. . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Extended Position 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Retracted Position (Not Shown) 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55 408 Rear (Main) PTO Safety Switch 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


Retracted Position 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55 408 Mid PTO Safety Switch (Optional for 35DA, 45DA, and 40DA Models Only) 28. . . . . . .

Removal 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



55 408 Seat Safety Switch 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



55 408 Parking Brake Safety Switch 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



Relays 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(DA) Series Relay Panel Identification 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(A) Series Relay Panel Identification 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing-Micro Relays 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

�HI�, �LOW�, Cruise Control, Fuel Shutoff, PTO Safety, and Glow Plug Lamp Relays 34. .

Replacement 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Headlight and Neutral Start Relays 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replacement 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Glow Plug Power Relay 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replacement 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


55-3


Diodes 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Testing 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diode Testing 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operator Safety Module 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Glow Plug Timer 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55 201 Engine Glow Plugs 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hazard Flasher/Turn Signal Control Module 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55 410 Fuel Level Sending Unit 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 55. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuel Shutoff Solenoid 56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55 414 Engine Oil Pressure Switch 58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Engine Coolant Temperature Sending Unit 59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hi/Low Transmission Range Switch 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional Testing 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hi/Low Transmission Range Solenoid 64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 66. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


55-4


Electric Cruise Control Switch (HST) 67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 68. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 68. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cruise Control Magnet (HST) 69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cruise Control Brake Release Switch 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Removal 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Extended Position (Not Shown) 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


Installation 72. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


55-5

BOLT TORQUE SPECIFICATIONS

Coarse Thread Fine Thread

Bolt Grade Pitch Foot- Newton Pitch Foot- Newton-BoltSize

GradeNo.

Pitch(mm)

FootPounds

NewtonMeters

Pitch(mm)

FootPounds

NewtonMeters

4T, 4 3.6-5.8 4.9-7.9

M6 7T, 7 1.0 5.9-9.4 7.9-12.7 ------ ------ ------

8T, 8, 11 7.2-10 9.8-13.6

4T 7.2-14 9.8-19 12-17 16.3-23

M8 7T 1.25 17-22 23-29.8 1.0 19-27 25.7-36.6

8T 20-26 27.1-35.2 22-31 29.8-42

4T 20-25 27.1-33.9 20-29 27.1-39.3

M10 7T 1.5 34-40 46.1-54.2 1.25 35-47 47.4-63.7

8T 38-46 51.5-62.3 40-52 54.2-70.5

4T 28-34 37.9-46.1 31-41 42-55.6

M12 7T 1.75 51-59 69.1-79.9 1.25 56-68 75.9-92.1

8t 57-66 77.2-89.4 62-75 84-101.6

4T 49-56 66.475.9 52-64 70.5-86.7

M14 7T 2.0 81-93 109.8-126 1.5 90-106 122-143.6

8T 96-109 130.1-147.7 107-124 145-168

4T 67-77 90.8-104.3 69-83 93.5-112.5

M16 7T 2.0 116-130 157.2-176.2 1.5 120-138 162.6-187

8T 129-145 174.8-196.5 140-158 189.7-214.1

4T 88-100 119.2-136 100-117 136-158.5

M18 7T 2.0 150-168 203.3-227.6 1.5 177-199 239.8-269.6

8T 175-194 237.1-262.9 202-231 273.7-313

4T 108-130 146.3-176.2 132-150 178.9-203.3

M20 7T 2.5 186-205 252-277.8 1.5 206-242 279.1-327.9

8T 213-249 288.6-337.4 246-289 333.3-391.6


55-6

DESCRIPTION OF OPERATION

Op. 55 100The TC Series Class 3 electrical system is a 12-voltnegative (--) ground system consisting of 3 mainwiring harnesses.

COMPONENT LOCATION AND FUNCTION

30002187

78

1

2 4 3 6D

6A

6C

6B

1

30002188

189212423

16

5

19 1722

25

2

30002189

14

A

15B

10 11

13 12 19 20 C

B

3


55-7

1. Battery - Located under the hood, in front of theradiator; electrical power source. Group 47

2. Main Fuse (40 Amp.) - Located on the left sideof the engine directly above the starter; protectsthe entire electrical system from damage due toexcessive current.

3. Fuse Block � Located underneath instrumentpanel; contains fuses that protect individualcircuits from damage due to excessive current.

4. Relay/Diode Panel � Located behind the leftside panel; houses relays utilized by individualcircuits and diodes which direct current within acircuit to allow the use of one wire within multiplecircuits to control a relay.

5. Key Switch � Located on the right side of theoperator�s console; used to switch battery poweron or off to the tractor�s electronic circuits, supplypower to the engine glow plugs, or to start thetractor.

6. Safety Start Switches (4) � Shuttle for 12x12transmission and range gear (A)HST transmis-sion, rear PTO (B), mid PTO (if equipped) (C),and the operator�s seat switch (D); will not allowthe tractor to start with the transmission or thePTO engaged, or without an operator in theoperator�s seat.

NOTE: The parking brake switch also lights theparking brake indicator light on the instrument panelwhen the parking brake is engaged.

NOTE: The tractor may be started without theoperator being seated when the parking brake leveris engaged.

7. Headlights � Located on the front grill of thetractor; Economy models have two headlights,Deluxe models have four headlights; headlightsilluminate the area in front of the tractor.

8. Taillights/Directional Signals/ Flasher Warn-ing (Hazard) Lights � Located at the rear of thetractor, on both sides of the ROPS; providewarning during transportation and emergency.

9. Instrument Panel � Located in the center of thedash panel; houses gauges and indicator lightsthat monitor tractor functions.

10. Light Switch � Located on the left side of thedash panel; switches the headlight, taillight andthe instrument panel lights on or off.

11. Hazard (Flashing Warning Lights) Switch �Located on the left side of the dash panel;switches the flashing warning (hazard) lights onand off.

12. Starter � Located on the left side of the engine;rotates the engine for starting.

13. Alternator (40 Amp.) � Located on the left sideof the engine; generates power to charge thebattery.

14. Engine Oil Pressure Switch � Located in frontof the cylinder head; provides warning of lowengine oil pressure.

15. Engine Coolant Temperature Sending Unit �Located in the thermostat housing on the frontleft side of the engine; warns the operator of highoperating temperatures.

16. Fuel Level Sending Unit � Located inside thefuel tank; sends a signal indicating fuel level tothe instrument panel.

17. Fuel Shutoff Solenoid � Located on the rightside of the engine; shuts off the fuel flow to theinjection pump to stop the engine.

18. Engine Glow Plugs � Located on the right sideof the cylinder head, adjacent to the fuelinjectors; aid in engine startup by warming the airin the combustion chamber.

19. Parking Brake Switch � Located under the right(A) (standard), left (B)(deluxe), platform; actu-ates with the parking brake mechanism;indicates when the parking brake is engaged byilluminating a light on the instrument panel.

20. Brake HST Cruise Release Switch � (DeluxeOnly) � Located under the left near the brakepedal pivot shaft; releases the HST speed controlwhen the brakes are applied.

21. HST Cruise Control Switch (Deluxe Only) �Located on the right fender; controls current tothe speed control magnet.

22. HST Control Magnet (Deluxe Only) � Locatedon the right transmission side of the steeringcolumn; locks the HST linkage in place to setconstant transmission speed.

23. Rear Work Light (50 Watt Halogen) (Optional)� Located on the right side of the ROPS; powerleads for the light are provided on the right fenderwiring harness.

24. HST Hi/Lo Range Selector Switch (DeluxeOnly) � Located on the right fender; momentarytoggle switch used to select either of the twodifferent HST gear ranges. Located on optionalfront two spool valve control handle.

25. Auxiliary Electrical Power Socket � Located atthe right rear of the operator�s platform; provideselectrical current for any auxiliary 12 voltelectrical item (15 amp maximum).


55-8

Op. 55 100

WIRING HARNESSES (Figure 3)A. HoodB. Front Main (includes engine and relay areas)C. Rear Chassis

Grounds

1. Negative battery post to the right side of the frame.2. Starter Mounting Bolt3. Left Side behind rear tire on HPL Housing

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6


55-9

ELECTRICAL SYSTEM COMPONENTS

WARNINGBefore working on any component of theelectrical system, the negative (--) battery cableshould be disconnected from the battery, aselectrical shock or damage to the systemcomponents may occur. Some testing requires12-volt power; use caution whenever power isused.

BATTERYThe tractor is equipped with a BCI group 47, 12-voltbattery with a minimum cold cranking ability of 600amps at 0°F (-18°C).

Make sure the battery connections are tight and freeof corrosion. A solution of baking soda and water maybe used to wash the outside surface and terminals ofthe battery when necessary. However, make sure thesolution does not get inside the battery. Aftercleaning, wash the battery with clean water, thenapply a small amount of petroleum jelly to theterminals to prevent corrosion.

In freezing temperatures, a good battery chargemust be maintained. If the battery becomesdischarged or run down, the electrolyte becomesweak and may freeze, causing damage to the case.If you must add water, use distilled water. Add thewater just before using the tractor so that the waterwill mix with the electrolyte during the chargingprocess, thus preventing the water from freezing.

To determine the battery charge, check the specificgravity of the electrolyte.

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55-10

Checking the Electrolyte LevelNOTE: Check the battery electrolyte level after every50 hours of operation.

WARNINGAlways check the electrolyte level with the tractorengine off, as an explosive gas is produced insidethe battery when the alternator is charging. Do notuse an exposed flame and do not smoke whenchecking the battery electrolyte level.

To check the battery electrolyte level:

1. Clean the top of the battery, then remove the ventplugs.

2. Add distilled water if the electrolyte level is low.The level is correct when the liquid is 1/4″ (6.35mm) above the plates.

NOTE: Keep distilled water in a non-metalliccontainer that is clean and well-covered.

3. Install the vent plug after making sure the ventholes are not blocked. At below freezingtemperatures, run the engine for a period of timeafter adding water, allowing the battery to charge,which prevents the water from freezing.

Removal

1. Release and lift the tractor engine cover.

2. Disconnect the negative (--) battery cable.

3. Disconnect the positive (+) battery cable.

4. Remove the hardware, 1, securing the battery.

5. Carefully remove the battery from the tractor.

IMPORTANT: Crossing the battery terminals maycause damage to the electrical system.

Installation

NOTE: When replacing the battery, use only a BCIgroup 47, 12volt battery. Make sure the battery fitsthe battery tray correctly and is properly secured withthe mounting hardware. Never use a battery thatdoes not fit properly in the battery tray. Do notovertighten the battery securing hardware. Do notovertighten the battery cables.

1. Place the battery in the battery tray with thebattery posts towards the front of the tractor.

2. Use the battery hold down hardware, 1, to securethe battery in the battery tray.

3. Connect the positive (+) cable to the positiveterminal.

4. Connect the negative (--) cable to the negativeterminal.

5. Lower and secure the tractor engine cover.

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1

8


55-11

MAIN FUSEThe main fuse is a 40-amp maxifuse, 1, located onthe left-hand side of the engine and positioned abovethe starter. This fuse protects the tractor�s entireelectrical system.

1

30997565

9

ReplacementTo replace the main fuse:

1. Unplug the connector to expose the fuse.

2. Remove the old fuse, 2, from the fuse holder andreplace.

IMPORTANT: Always replace this fuse with a similar40 amp fuse; DO NOT increase amperage rating.

2

19998319

10


55-12

FUSE BLOCK

NOTE: The fuse block is configured the same forboth models except for the 5th fuse position. Theeconomy model (shown) uses a 5-amp fuse, whichis used for alternator excitation. The deluxe modeluses a 7.5 amp fuse, which is used for alternatorexcitation, the cruise relay, and transmission shiftcontrol.

To gain access to the fuse panel, remove the twoinstrument panel mounting screws, 1, lift theinstrument panel from the body panel. The fuse blockis located on the left side of the instrument panelopening. Always replace blown fuses with the sizespecified for that circuit.

1

10034980

11

From left to right as viewed from above the tractor,the fuse block contains the following fuses:

Fuse Size Circuit Protected

1 7.5 amp Voltage regulator, Glow plugauto heat control

2 8 ampCircuit

Breaker

Operator safety system, fuelsolenoid

3 10 amp Turn signal, rear work light

4 15 amp Main lighting control

5 7.5 amp Instrument panel

6 10 amp Hazard flasher lights,auxiliary power socket

7 15 amp Front headlights, auxiliaryrear work light

50031486

12 3 4 5 6

7

12


55-13

KEY SWITCH

The key switch is located on the right side of theoperator�s console. The key switch has threekey-operated positions, which are: STOP, 1,HEAT/ACCESSORY/RUN, 2, and START, 3. Turningthe key clockwise from the stop position will align theelectrical contacts within the key switch. With thecontacts aligned, the circuit is closed and the batterycurrent will flow through the circuit.

In the STOP position, 1, there is no battery powersupplied to electrical circuits and the key may beremoved from the switch to prevent unauthorizeduse of the tractor. The STOP position, 1, also stopsthe tractor engine, when running. When the key is inthe HEAT/ACC/RUN position, 2, battery currentflows to the engine glow plugs to aid in starting theengine when the engine is cold. The HEAT/ACC/RUN position, 2, also allows current to flow from thebattery to the tractor accessories without the enginerunning. The switch will also be in this position whilethe tractor is running. When the key is in the STARTposition, 3, power is supplied to the starter motor tocrank and start the engine. The key switch is springloaded and will return from the START position,3, tothe HEAT/ACC/RUN position, 2.

The key switch is not serviceable and must bereplaced if troubleshooting determines the switch isdefective.

Removal

1. Raise the tractor engine cover.

2. Disconnect the negative (--) battery cable fromthe negative (--) battery terminal.

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3

13

3. Remove the two retaining bolts, 1, from the insideof the tractor firewall, to loosen the right sidecover, 2.

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55-14

4. Remove the two retaining bolts, 1, from the leftside cover of the tractor.

5. Carefully turn the right cover to reveal the keyswitch.

6. Disconnect the key switch from the wiringharness.

7. Remove the plastic retaining nut on the keyswitch to remove the switch from the right cover.

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15

Terminal IdentificationA StartB 12 V InputC ACC TerminalD 12 V Input

TestingUse an ohmmeter to test each position of the keyswitch for electrical continuity.

Stop Position (Not Shown)1. With the key switch in the stop position, continuity

should not exist between any of the terminals. Ifcontinuity exists between any of the terminalswhile the switch is in the �stop� position, the keyswitch is defective and needs replaced.

30002125

16

Heat/ Accessory/ Run PositionWhen the key switch in the �Heat/ ACC/ Run�position, continuity should exist between the �B� and�C� terminals.

1. Make sure the switch is in the �Heat/ACC/Run�position.

2. Using an ohmmeter, touch one of the test probesto terminal �B�. Touch the other test probe toterminal �C�.

3. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance indicating thatcontinuity exists between terminal �B� andterminal �C�. If continuity does not exist betweenterminal B� and terminal �C�, the key switch isdefective and needs replaced.

NOTE: Continuity should not exist betweenterminals A and D in the �Heat/ACC/Run� position.

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55-15

Start PositionMake sure the key switch is in the �Start� position.

1. Using an ohmmeter, touch one of the test probesto terminal �B�. Touch the other test probe toterminal �C�.

2. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance indicating thatcontinuity exists between terminal �B� andterminal �C�. If continuity does not exist betweenterminal �B� and terminal �C�, the key switch isdefective and needs replaced.

30002126

18

3. Following the procedure outlined in the previous2 steps, test terminals �A� and �D�. With the Keyin the �Start� position, continuity should existbetween the �A� and �D� terminals.

30002127

19

LIGHT SWITCH (Road Lights)The light switch is a rotary type switch,1, that islocated on the left side of the dash. The switch hasfour operating positions,

• Off

• Taillights and instrument panel illumination

• Road lights low beam

• Road lights high beam (DA models only)

The tractor light system will not operate unless thekey switch is in the �ACC/RUN� position. 10035023

1

20


55-16

Removal1. Raise the tractor engine cover.

2. Remove the two retaining bolts, 1, from the insidethe left side of the firewall of the tractor.

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21


4. Disconnect the wiring harness from the lightswitch.

NOTE: Early production tractors have individual wireleads, that are identified with switch terminalnumbers that connect to the terminals of the switch.Later production have a harness connector thatplugs onto the switch terminals.

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22

5. Remove the switch from the dash by removingscrew,1, and knob, 2, from the switch stem. Thenunthread the nut (not shown)that retains theswitch to the dash and remove the switch fromthe underside of the dash panel.

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55-17

Terminal Identification and Testing

TERMINAL # FUNCTION

30 Current (+) Supply

57/58 Taillights/Panel Illumination

56b Road lights low beam

56a Road lights high beam(DA models)

Use an ohmmeter to test each position of the lightswitch for electrical continuity.

POSITION TERMINALCONTINUITY

Off No continuity ofany terminals

1st Taillights/PanelIllumination

30 and 57/58

2nd Road lightslow beam

30, 57/58 , 56b

3rd Road lights highbeam (DA models)

30, 57/58, 56a

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55-18

WORK LIGHT SWITCH

The work light switch, 1, is a two-position,rocker-type switch located on the left-hand side ofthe tractor dash panel.

The two positions of the work light switch are:

• OFF POSITION (Light symbol protruding out ofswitch)

• ON POSITION (Light symbol pushed into switch)

An internal indicator bulb illuminates when the lightswitch is in the �on� position.

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6. Remove the light switch from the dash panel byreleasing the locking tabs on the switch andpushing the switch through the dash panel.

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55-19

Forward Position �On�1. Push the light switch in the forward position.

2. Using an ohmmeter, touch one of the test probesto terminal 2. Touch the other test probe toterminal 3.

3. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance indicating thatcontinuity exists between terminal 2 and terminal3. If continuity does not exist between terminal 2and terminal 3, the light switch is defective andneeds replaced.

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5. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance indicating thatcontinuity exists between terminal 5 and terminal6. If continuity does not exist between terminal 5and terminal 6, the light switch is defective andneeds replaced.

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55-20

Op. 55 404

HEADLIGHT

There are for halogen front head lights on the (DA)and (A) series tractors.

• Two work headlights, 1.

• Two road headlights, 2.

NOTE: On the �A� series the road headlights aresimple beam (50 watt) and on (DA) series the roadheadlights are dual element (50/654 watt).

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30

ReplacementIf head lamps, 1, fail to operate, the bulb must bereplaced. To change the bulb:

1. Open the tractor hood.

2. Bulb Removal:

Road lights, 1, (Blue Cap/dual element):Release retaining tabs and pull bulb assemblyfrom holder.

Work lights, 2, (Single element): Turn bulbassembly 1/4 turn and remove bulb from holder.

3. Bulb Replacement:

Road lights: Insert bulb assembly and securewith retaining clips.

Work lights: Insert bulb assembly into slots andturn 1/4 turn clockwise to secure.

4. Rotate the socket counterclockwise a quarterturn and remove the socket from the housing.

5. Remove the bulb assembly from the harness.

6. Place a new bulb in the socket, then reinstall thesocket in the housing.

IMPORTANT: Be careful not to touch the bulb withbare fingers. Oil from the fingers can shorten the life ofbulb. Use protective cloth or glove when installing bulb.

NOTE: Replacement bulbs are:Road lights: HB1/9004, dual element 50/65 Watt,HalogenWork lights: GE886, single element 50 Watt,Halogen.

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2

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55-21

Op. 55 404

TAILLIGHTThe taillights, 1, are located on the left and right rearROPS uprights. The taillights illuminate the rear ofthe tractor to provide warning to approachingvehicles.

NOTE: The same procedure is used for both sides.

To replace a taillight bulb:

1. Remove the two screws, 2, retaining the taillightlens and remove the lens.

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32

2. Remove the defective bulb, 3, by turning itcounterclockwise and pulling it out of the socket.

3. Install the new bulb by pushing it into the socketand rotating it clockwise until it locks into place.

NOTE: Replace the defective bulb with a new #1156bulb.

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33

NOTE: The same procedure is used on both sides.

To replace a flasher bulb:

1. Remove the two screws, 4, (Figure 32), retainingthe flasher/turn signal lens and remove the lens.

2. Remove the defective bulb, 5, by turning itcounterclockwise and pulling it out of the socket.

3. Install the new bulb by pushing it into the socketand rotating it clockwise until it locks into place.

NOTE: Replace the defective bulb with a new #1157bulb. 10034984

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55-22

HAZARD LIGHT SWITCH

The hazard light switch, 1, is a two-position,rocker-type switch located on the left-hand side ofthe tractor dash panel.

The two positions of the hazard light switch are:

• OFF POSITION (Safety symbol protruding out ofswitch)

• ON POSITION (Safety symbol pushed intoswitch)

An internal indicator bulb flashes when the hazardlight switch is in the �on� position.

The hazard lights will operate regardless of the keyswitch position.

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6. Remove the light switch from the dash panel byreleasing the locking tabs on the switch andpushing the switch through the dash panel.

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55-23

TestingUse an ohmmeter to test both of the positions of thehazard light switch for electrical continuity.

�Off� Position1. Using an ohmmeter, touch one of the test probes

to terminal 1. Touch the other test probe toterminal 2.

2. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance indicating thatcontinuity exists between terminal 1 and terminal2. If continuity does not exist between terminal 1and terminal 2, the switch is defective and needsreplaced.

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4. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance indicating thatcontinuity exists between terminal 6 and terminal7. If continuity does not exist between terminal 6and terminal 7, the internal indicator bulb isdefective and the switch needs replaced.

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�On� Position1. Using an ohmmeter, touch one of the test probes

to terminal 2. Touch the other test probe toterminal 3.


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55-24



20004014

41


6. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance indicating thatcontinuity exists between terminal 6 and terminal7. If continuity does not exist between terminal 6and terminal 7, the internal indicator bulb isdefective and needs replaced.

Installation1. Insert the hazard light switch into the dash panel

until the locking tabs click into place.

2. Connect the wiring harness to the hazard lightswitch.

3. Install the left side panel using the four retainingbolts.

4. Connect the negative (--) batter cable to thenegative (--) battery terminal.

5. Lower the tractor engine cover.

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55-25

Op. 55 408

TRANSMISSION RANGE SAFETY SWITCH(HST AND GEAR)

The transmission range safety switch, 1, is asingle-pole, push-button type switch located under-neath the left side operator�s platform. When thetransmission is in high or low range, the contacts inthe switch are open, not allowing the tractor to start.When the transmission is in the neutral rangeposition, the contacts in the switch are closedcompleting the circuit. This allows the tractor to start.

NOTE: The transmission range safety switch may betested for continuity without removing the switch fromthe tractor, but it is recommended that the switch beremoved for testing. Follow the same test procedureoutline when the switch is removed from the tractor.

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HST

43

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Gear

44

Removal



3. Disconnect the transmission range safety switchleads from the wiring harness.

4. Remove the transmission range safety switch, 1,with the rubber washer, 2, from the transmissioncase.

NOTE: The HST range shift rail, (Deluxe) and the 12 x12 shuttle shift rail, (Economy), operate the transmissionrange safety switch. Grooves in the shift rails accept thebalk pin, extending the plunger in the safety switch,when the range or shuttle control levers are in neutral.This completes the circuit, allowing the tractor to start.

5. Use a pencil magnet to remove the balk pin, 3, fromthe transmission range safety switch hole in thetransmission case. Inspect the balk pin, 3, fordamage.

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55-26

TestingUse an ohmmeter to test both of the positions of thetransmission range safety switch for electrical continuity.

Extended Position

1. With the transmission range safety switch in the�extended� position, touch one of the test probesto the one switch lead. Touch the other test probeto the other switch lead.

2. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance indicating thatcontinuity exists between the two leads. Ifcontinuity does not exist, the switch is defectiveand needs replaced.

Retracted Position (Not Shown)

3. Using an ohmmeter, continuity should not existbetween the two leads. If continuity existsbetween the two leads while the switch is in the�retracted� position, the switch is defective andneeds replaced.

Installation

1. Insert the balk pin, 3, into the transmission rangesafety switch hole in the transmission case.

2. Install the transmission range safety switch, 1,with the rubber washer, 2, into the transmissioncase.

3. Connect the wiring harness to the transmissionrange safety switch leads.

4. Connect the negative (--) batter cable to thenegative (--) battery terminal.

5. Lower the tractor engine cover.

30002201

EXTENDED

46


55-27

Op. 55 408

REAR (MAIN) PTO SAFETY SWITCHThe rear PTO safety switch, 1, is a single-pole,push-button type switch located underneath the leftside operator�s platform on the PTO linkage. Whenthe PTO is engaged, the contacts in the switch areopen, not allowing the tractor to start. When the PTOis disengaged, the contacts in the switch are closed,completing the circuit. This allows the tractor to start.

NOTE: Remove the left wheel assembly for easieraccess to the rear PTO safety switch. Be sure to provideadequate support to the rear axle during repairs.

NOTE: The PTO safety switch may be tested forcontinuity without removing the switch from thetractor, but it is recommended that the switch beremoved for testing. To test the switch in the tractor,follow the same procedure used when the switch isremoved from the tractor.



3. Disconnect the rear PTO safety switch leadsfrom the wiring harness.

4. Remove the retaining nut, which secures the rearPTO safety switch to the PTO linkage.

5. Remove the rear PTO switch by pressing in onthe locking tabs and sliding the switch upward outof the support bracket.

TestingUse an ohmmeter to test both of the positions of therear PTO safety switch for electrical continuity.

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Extended PositionWith the rear PTO safety switch in the �extended� (out)position, continuity should not exist between the twoswitch leads. If continuity exists between the switchleads while the switch is in the �extended� position, therear PTO safety switch is defective and needs replaced.

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55-28

Retracted PositionWith the rear PTO safety switch in the �retracted� (in)position, continuity should exist between the twoswitch leads. If continuity does not exist between theswitch leads while the switch is in the �retracted�position, the switch is defective and needs replaced.

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Op. 55 408

MID PTO SAFETY SWITCH (Optional for35DA, 45DA, and 40DA models only)

The mid PTO safety switch, 1, is a double-pole,single throw-style switch located on the control leverpivot bracket. The switch, consisting of a rubber-booted, push-button actuator and four rubber coatedterminals, monitors the position of the mid PTOlinkage and is activated by the mid PTO lever.

Removal



3. Disconnect the mid PTO safety switch from thewiring harness.

4. Remove the two switch mounting bolts, 2, andpull the switch away from the tractor differentialhousing.

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50

TestingUse an ohmmeter to test both of the positions of themid PTO safety switch for electrical continuity.

Extended PositionWith the mid PTO safety switch in the �extended�position, continuity should not exist between any ofthe four terminals. If continuity exists between any ofthe four terminals while the switch is in the �extended�position, the switch is defective and needs replaced.


55-29

Retracted PositionUsing an ohmmeter, touch one of the test probes toterminal, A. Touch the other test probe to terminal, B.

1. Push the switch to the retracted position.

2. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance indicating thatcontinuity exists between terminal, A, andterminal, B. If continuity does not exist betweenterminal A, and terminal, B, the switch isdefective and needs replaced.

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3. Using an ohmmeter in the same matter, touchone of the test probes to terminal, C. Touch theother test probe to terminal, D.

4. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance indicating thatcontinuity exists between terminal, C, andterminal, D. If continuity does not exist betweenterminal, C, and terminal, D, the switch isdefective and needs replaced.

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52

Op. 55 408

SEAT SAFETY SWITCH

The seat safety start switch, 1, is a single pole,push-button type switch located underneath theoperator seat. When the operator is not seated, theswitch contacts are open and will not allow the tractorto start. When the operator is seated, the switchcontacts are closed, allowing the tractor to start.

NOTE: The seat safety switch is non-adjustable.

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55-30

RemovalNOTE: The seat safety start switch may be tested byseparating the switch leads, 1, under the seat,hooking up ohmmeter test probes to the seat switchleads and pushing down on the middle of the seat tocheck for switch continuity. However, it is stronglyrecommended that the switch be removed forcontinuity testing.


2. Disconnect the negative (--) battery cable fromthe battery.

3. Raise the operator�s seat to reveal the seatsafety switch.

4. Disconnect the seat safety start switch leads, 1,from the wiring harness. Lower the operator�sseat.

5. Release the locking tabs to remove the switchfrom the seat and remove the switch leads, 1,from the switch, 2.

TestingUse an ohmmeter to test both of the positions of theseat safety start switch for electrical continuity.

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Extended PositionWith the seat safety start switch in the �extended� (out)position, continuity should not exist between the twoswitch leads. If continuity exists between the switchleads while the switch is in the �extended� position, theseat safety start switch is defective and needsreplaced.

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55

Retracted PositionWith the seat safety start switch in the �retracted� (in)position, continuity should exist between the twoswitch leads. If continuity does not exist between theswitch leads while the switch is in the �retracted�position, the switch is defective and needs replaced.

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55-31

Op. 55 408

PARKING BRAKE SAFETY SWITCH

The parking safety switch, 1, is a double-pole, singlethrow-style switch located on the brake control leverpivot bracket. The parking brake switch is locatedbeneath the left operator�s platform on TC35D, 40D,45D models only.

TestingUse an ohmmeter to test both of the positions of theparking brake safety switch for electrical continuity.

Extended Position (Not Shown)

1. With the parking brake safety switch in the�extended� (�off�) position, continuity should notexist between any of the four terminals. Ifcontinuity exists between any of the fourterminals while the switch is in the �extended�position, the switch is defective and needsreplaced.

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Retracted PositionUsing an ohmmeter, touch one of the test probes toterminal, A. Touch the other test probe to terminal, B.

1. Push the parking brake safety switch into the�retracted� position.

2. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance indicating thatcontinuity exists between terminal, A, andterminal, B. If continuity does not exist betweenterminal A, and terminal, B, the switch isdefective and needs replaced.

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58

3. Using an ohmmeter, touch one of the test probesto terminal, C. Touch the other test probe toterminal, D.

4. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance indicating thatcontinuity exists between terminal, C, andterminal, D. If continuity does not exist betweenterminal, C, and terminal, D, the switch isdefective and needs replaced.

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55-32

RELAYS

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6 8 14

13

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60

(DA) Series Relay Panel Identification

1. HST �LOW� Range Relay2. HST Cruise Control Relay3. Flasher Relay4. Auxiliary Work lights Relay5. HST �HIGH� Range Relay6. Fuel Shutoff Relay7. PTO Safety Relay

8. Glow Plug Lamp Relay9. Glow Plug Timer10. Front Work Lights Relay11. Neutral Start Relay12. Glow Plug Power Relay13. Safety Module14. Diode


55-33

10043899

1 2

3 4 5

6

8

13

7 9

10

61

(A) Series Relay Panel Identification

1. Flasher Relay2. Auxiliary Work lights Relay3. Fuel Shutoff Relay4. PTO Safety Relay5. Glow Plug lamp Relay

6. Glow Plug Timer7. Front Work Lights Relay8. Neutral Start Relay9. Glow Plug Power Relay10. Safety Module


55-34

Relays are used on the TC series tractors toautomatically complete (close) a circuit. The relaysare located under the left side of the dash cover,behind the tractor�s firewall. A relay contains twoparts of a circuit. One part, the control circuit, usescurrent to energize a coil. The other part, the functioncircuit, is a switch. When energized, the coil of a relaybecomes an electromagnet opening or closing asingle circuit or directing current from one circuit toanother, depending on the type of relay.

TC deluxe model tractors utilize ten relays andeconomy model tractors use six relays. There arefour different relays used on the TC series tractors.

The function circuits are normally open when nocurrent is being supplied to the coil. If a circuit with anSPST relay is energized with current on the TC seriestractor, the switch becomes closed and the circuit iscompleted. The relay is then considered to belatched.

62

TESTING-MICRO RELAYS

�HI�, �LOW�, CRUISE CONTROL, FUELSHUTOFF, PTO SAFETY, AND GLOW PLUGLAMP RELAYS

Replacement

1. Remove the relay suspected of being faulty fromthe tractor to test.

2. Using an ohmmeter, touch one test probe toterminal 3 and the other test probe to terminal 4.

3. Observe the ohmmeter. There should be little orno resistance, indicating continuity. If there is nocontinuity, the relay is defective and needsreplaced.

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55-35

4. If the previous test showed continuity, touch oneohmmeter probe to terminal 1 and the remainingprobe to terminal 2.

5. Observe the ohmmeter. The ohmmeter shouldread approximately 79.5 ohms. If the reading isnot as specified, the relay is defective and needsreplaced.

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64

6. If the results from the previous test were good,use a jumper lead to connect the positive (+)terminal of a 12-volt power source to terminal 1of the relay. Use a jumper lead to connect thenegative (--) terminal of a 12-volt power source toterminal 2 of the relay. The relay should nowenergize.

7. Using an ohmmeter touch a test probe to terminal3 of the relay. Touch the other ohmmeter testprobe to terminal 5.


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65

HEADLIGHT AND NEUTRAL STARTRELAYS

Replacement

1. Remove the relay suspected of being faulty fromthe tractor to test.

2. Using an ohmmeter, touch one test probe toterminal 87A and the other test probe to terminal30.


66


55-36

4. Repeat the previous test for terminal 30 and 87.There should be no continuity between theseterminals. If tests indicate continuity, the relay isdefective and needs replaced.




67

8. While the 12-volt power source is still connected,touch an ohmmeter test probe to terminal 30 andterminal 87A. There should be high resistanceindicating no continuity between the terminals. Ifthere is continuity, the relay is defective andneeds replaced.

68


55-37

GLOW PLUG POWER RELAY

Replacement

1. Remove the glow plug power relay from thetractor.

2. Using an ohmmeter, touch one test probe toterminal 87 and the other test probe to terminal30.

3. Observe the ohmmeter. There should be highresistance between these terminals, indicatingno continuity. If tests indicate continuity, the relayis defective and needs replaced. 30004023

69




30004024

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55-38

DIODES

There are three separate diodes used on the �DA�and �A� series tractors.

1. Diode Block used for HST �High� range (DAmodels only)(Located in relay panel)

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71

2. HST cruise control diode(Located below relay panel, tied to wire harness)

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72

3. Rear PTO stationary operation diode (Allmodels)(Located underneath the left rear operatorsplatform, tied to wire harness)

Diodes are electrical devices which current isallowed to pass in one direction, directing currentwithin a circuit. Diodes allow the use of one wirewithin multiple circuits to control current flow toelectrical components, such as relays. The (DA)model tractors utilize four diodes to direct current.Two of these diodes are paired together in one case,referred to as a diode module. The �A� series tractorsonly have one diode in the tractor harness.

3

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55-39

Module Testing1. Remove the diode module suspected of being

faulty from the tractor.

NOTE: For this test, an electrical multimeter withdiode test capabilities may be used in place of anohmmeter. If a multimeter with diode testingcapabilities is unavailable, use an ohmmeter to testas described below.

2. Using an ohmmeter, touch the red, positive (+),test probe to diode terminal �1�. Touch the black,negative (−), ohmmeter test probe to diodeterminal �2�. Observe the ohmmeter.

3. The ohmmeter should show high resistance,indicating no continuity and that current is notflowing through the diode in that direction. If thereis continuity. Check to see that the test probesare on the correct terminals, and if they are, thediode module is defective and needs replaced.

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74

4. If the previous test indicated the diode wasfunctioning properly, touch the red, positive (+),ohmmeter test probe to terminal �2� of the diodeand the black, negative (--), test probe to terminal�1� of the diode.

5. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance, indicating continuityin that direction. If the ohmmeter does not showcontinuity, the diode module is defective andneeds replaced.

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55-40

6. Repeat the test outlined in steps 2 through 5, totest terminals 3 and 4 of the diode module.Replace the diode module if test determine thediode module to be defective. The diode shouldshow continuity only when red, positive (+),positive test probe is touching terminal 4 and theblack negative (--) test probe is touching terminal3.

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76

Diode TestingUse an ohmmeter to test the diodes.

Connect the ohmmeter leads to the diode terminalsand observe the meter reading, then reverse theohmmeter leads and observe the meter reading.

• Continuity should exist in one direction only.

If there is continuity in both directions, or if there is nocontinuity in either direction, replace the faulty diode.Power should flow in a positive to negative direction.

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55-41

OPERATOR SAFETY MODULE

The operator safety module, 1, is part of the tractorsafe operation circuit. When the operator safetymodule is energized it allows the ground circuit forthe control portion of the fuel shutoff solenoid relay tobe completed. If current no longer flows to theoperator safety module, the ground circuit for therelay becomes open. This causes the fuel shutoffsolenoid relay to become non-energized. When therelay becomes non-energized, the current to the fuelshutoff solenoid is discontinued, stopping the tractorengine. Current is supplied to the operator safetymodule when the operator is seated, or when thePTO is disengaged and the parking brake is applied.The operator safety module, 1, is located under theleft side of the dash cover, behind the tractor�sfirewall.

Removal1. Disconnect the negative (--) battery cable from

the negative (--) battery terminal.

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HST

78

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1

79


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4. Remove the left side cover to reveal therelay/diode panel.

5. Release the locking tabs on the operator safetymodule to disconnect the module from the wireharness.

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Testing1. Using an ohmmeter, touch the red, positive (+),

test probe to module terminal �B�. Touch theblack, negative (−), ohmmeter test probe to diodeterminal �C�. Observe the ohmmeter.

2. The ohmmeter should show high resistance,indicating no continuity and that current is notflowing through the operator safety module. Ifthere is continuity. Check to see that the testprobes are on the correct terminals, and if theyare, the operator safety module is defective andneeds replaced.

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82

3. If the previous test indicated the operator safetymodule was functioning properly, clamp the red,positive (+), ohmmeter test probe to terminal �B�of the safety module and the black, negative (−),test probe to terminal �C� of the Safety module.

CAUTIONOnly apply battery current to the operator safetycontrol module for 3--5 seconds or damage willoccur.

4. Connect a jumper wire from terminal �E� on theoperator safety module to the positive (+)terminal of a 12-volt power supply.

5. Connect a jumper wire to terminal �B�.

6. While observing the ohmmeter, touch the jumperwire to terminal �B� from the negative (--) terminalof the 12-volt power supply. There should be littleor no resistance, indicating continuity. If thereading shows high resistance, the operatorsafety module is defective and needs replaced.

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55-43

GLOW PLUG TIMER

The glow plug timer, 1, is an electronic timer that islocated under the left side of the dash cover, behindthe tractor�s firewall. The timer controls how long theglow plugs and the indicator light on the instrumentpanel remain supplied with current when the keyswitch is turned form the �OFF� position to the�ACC/RUN� position. The glow plug timer delays theglow plugs and indicator light on deluxe modeltractors for 4-5 seconds and for 10-11 seconds on theeconomy model tractors. The glow plug timercontrols the glow plug and indicator light circuit bysupplying or cutting the ground path to the glow plugpower relay�s coil circuit. 10043894

1

HST

84

10043899 Gear

1

85


55-44

Testing1. Disconnect the negative (--) battery cable from

the battery.

2. Remove the bolt retaining the light timer to thetractor and disconnect the timer from the mainwiring harness.

NOTE: The terminals are not number or letter codedon the light timer.

3. Connect a jumper wire from terminal �C� on thetimer, 1, to the positive (+) terminal of a 12-voltpower supply.

4. Connect a test light, 2, from terminal �A� of thetimer, 1, to the positive (+) terminal of a 12-voltpower supply.

5. Connect a jumper wire from terminal �D� of thetimer, 1, to the negative (--) terminal of the 12-voltpower supply. Observe the test light, 2.

6. The test light should illuminate for approximately4 � 5 seconds for the deluxe models and 10-11seconds for economy models, then turn off. If thetest light fails to illuminate or does not turn offafter the specified time, the timer is defective andneeds replaced.

7. Connect the negative (−) battery cable to thebattery.

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12

-- +

12 VOLTSA B C

D E

86

Op. 55 201

ENGINE GLOW PLUGSThe engine glow plugs, 1, are located on the rightside of the engine cylinder head, below the fuelinjectors. The glow plugs are used to preheat the airin the pre-combustion chamber. This aids in thestarting of the engine when cold.

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55-45

The glow plugs utilize a heating element that iscontained in a stainless steel sheath, 1. The coiledheating wire, 2, is sintered into magnesium oxidepowder, 3. The magnesium oxide powder is used toevenly transfer heat to the stainless steel sheath,which heats the air in the combustion chamber. Themagnesium oxide powder is also used to insulate theheating wire from the outer sheath and glow plugbody.

The glow plug heats when electrical current ispassed from the glow plug electrode, 4, to one endof the heating wire, 2. Electrical resistance warms theheating wire when electrical current is flowingthrough the wire. The opposite end of the wire isconnected to the sheath. The sheath and glow plugbody, 5, are grounded by the engine block.

NOTE: All deluxe TC tractors utilize a fast heatingtype glow plug (marked Y-701RS). All economymodel tractors utilize a slower heating glow plug(marked Y-107 V glow plug).

4

3

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88

Removal1. Disconnect the negative (−) battery cable from

the battery.

2. Remove the electrode nuts, 1, the electricalconnector, 2, and washers securing theelectrode bus bar, 3, to the glow plugs.

3. Remove the glow plug(s) from the enginecylinder head.

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3

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55-46

Testing1. Remove carbon from the sheath end of the glow

plug

NOTE: Do not test resistance using the glow plugsheath.

2. Using an ohmmeter, touch one test probe to theglow plug electrode, 1. Touch the other test probeto the glow plug body, 2.

3. Observe the ohmmeter reading, a resistancereading of 0.8 ohms maximum is normal for theTC deluxe model tractor glow plugs. A resistancereading of 1.0 ohms maximum is normal for TCeconomy model tractor glow plugs. If theresistance is too high, the glow plug is defectiveand needs replaced.

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Installation1. Thread the glow plugs into the engine cylinder

head. Torque each glow plug to 10 � 15 N⋅m (11.0� 14.5 ft. lb.).

2. Install the electrode bus, 1, and the washers ontothe glow plugs. Secure with the three (3) nuts, 2.

3. Connect the electrical connector, 3, to the wireharness.

4. Connect the negative (--) battery cable to thebattery.

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55-47

HAZARD FLASHER/TURN SIGNALCONTROL MODULEThe hazard flasher/turn signal control module, 1, islocated underneath the steering column mountingbracket. The control module controls current flowingto the hazard flasher/turn signal lights on the rearfenders. Refer to the chart below for the functions ofthe control module.

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HAZARD/TURN SIGNALSWITCH POSITION

RESULT

Hazard switch �On� Both flashers blink in unison.

Left turn signal �On� Left flasher and taillight blink and right flasher and taillightremain solid.

Right turn signal �On� Right flasher and taillight blink and left flasher and taillightremain solid.


55-48


the negative (--) battery terminal.

2. Raise the tractor hood.



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5. Unplug the connector from the control module, 1.

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7. Remove the left side cover to reveal therelay/diode panel.

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55-49

TestingUse a 12 volt power source, a suitable switch, jumperwires and test lights to perform the 3 tests on thehazard flasher /turn signal control module.

NOTE: Disregard terminal markings on the module.Refer to terminal markings in the illustration.

Test 1 � Test 1 is used to verify that the controlmodule is supplying power to both of the hazardlights. This test simulates the hazard switch beingturned to the �On� position.

1. Connect a jumper wire to terminal 3 of the controlmodule and to the positive (+) terminal of a testlight. This test light will simulate the left flasher.Connect the negative (--) terminal of test light tothe negative (--) terminal of the power source.

2. Connect a jumper wire to terminal 4 of the controlmodule and to the positive (+) terminal of a testlight. This test light will simulate the right flasher.Connect the negative (--) terminal of the test lightto the negative (--) terminal of the power source.

3. Connect a jumper wire to the positive (+) terminalof the power source and the switch.

4. Connect a jumper wire to the switch and terminal2 on the control module.

5. Connect a jumper wire to the positive (+) terminalof the power source and to terminal 1 of thecontrol module.

6. Connect a jumper wire to the negative (--)terminal of the power source and to terminal 6 ofthe control module.

7. Move the switch to the �On� position, observe thetwo test lights. Both should flash on and offsimultaneously.

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Test 2 � Test 2 is used to verify that the controlmodule is functioning properly when the left turnsignal is activated. This test simulates the turn signalswitch being turned to the �Left� position.

1. Connect a jumper wire to terminal 10 of thecontrol module and to the positive (+) terminal ofa test light. This test light will simulate the lefttaillight (red). Connect a jumper wire to the (--)negative terminal of the test light and to thenegative (--) terminal of the power source.

2. Connect a jumper wire to terminal 11 of thecontrol module and to the positive (+) terminal ofa test light. This test light will simulate the righttaillight (red). Connect a jumper wire to the (--)negative terminal of the test light and to thenegative (--) terminal of the power source.

3. Connect a jumper wire to terminal 4 of the controlmodule and to the positive (+) terminal of a testlight. This test light will simulate the right flasher(amber). Connect a jumper wire to the (--)negative terminal of the test light and to thenegative (--) terminal of the power source.

4. Connect a jumper wire to terminal 3 of the controlmodule and to the positive (+) terminal of a testlight. This test light will simulate the left flasher(amber). Connect a jumper wire to the (--)negative terminal of the test light and to thenegative (--) terminal of the power source.





9. Switch the switch to the �On� position, observethe two test lights. The left flasher and the lefttaillight should both flash on and off while theright flasher and right taillight remain lit (solid).

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Test 3 � Test 2 is used to verify that the controlmodule is functioning properly when the right turnsignal is activated. This test simulates the turn signalswitch being turned to the �Right� position.

1. Connect a jumper wire to terminal 10 of thecontrol module and to the positive (+) terminal ofa test light. This test light will simulate the lefttaillight (red). Connect a jumper wire to the (--)negative terminal of the test light and to thenegative (--) terminal of the power source.

2. Connect a jumper wire to terminal 11 of thecontrol module and to the positive (+) terminal ofa test light. This test light will simulate the righttaillight (red). Connect a jumper wire to the (--)negative terminal of the test light and to thenegative (--) terminal of the power source.

3. Connect a jumper wire to terminal 4 of the controlmodule and to the positive (+) terminal of a testlight. This test light will simulate the right flasher(amber). Connect a jumper wire to the (--)negative terminal of the test light and to thenegative (--) terminal of the power source.

4. Connect a jumper wire to terminal 3 of the controlmodule and to the positive (+) terminal of a testlight. This test light will simulate the left flasher(amber). Connect a jumper wire to the (--)negative terminal of the test light and to thenegative (--) terminal of the power source.





9. Switch the switch to the �On� position, observethe two test lights. The right flasher and the righttaillight should both flash on and off while the leftflasher and left taillight remain lit (solid).

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Installation1. Plug the tractor wire harness connector into the

control module, 1.

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2. Install the left side rear panel onto the tractor.

3. Connect the negative (--) battery cable to thenegative (--) battery terminal.

4. Lower and secure the tractor hood.


55-53

Op. 55 410

FUEL LEVEL SENDING UNITThe fuel level sending unit, 1, is mounted on top of thefuel tank and extends into the tank. The sending unitutilizes a float the raise and lowers with the fuel levelinside the tank. The float regulates a variableresistance to ground, which translates into move-ment of the fuel gauge on the instrument panel. Asthe float lowers (fuel being consumed) inside thetank, the ground resistance increases, indicatingless fuel on the fuel gauge.

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2. Disconnect the negative (−) battery cable fromthe battery.

3. Disconnect the fuel level sending unit from thewiring harness.

4. Remove the two screws, 1, to remove the fuellevel sending unit cover, 2.

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5. Remove the five (5) retaining screws, 1, thatsecure the sending unit, 2, to the fuel tank.

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6. Carefully remove the sending unit, 1, from thefuel tank.

7. Remove and discard the sealing gasket, 2, fromthe sending unit, 1.

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Testing1. Using an ohmmeter, touch one test probe to

terminal �A� of the sending unit, touch the othertest probe to terminal �B� of the sending unit.Observe the reading on the ohmmeter.

2. With the sending unit float in the down position(tank empty), the ohmmeter should indicatebetween 248-252 ohms. If the ohmmeter readingis not within these specifications, the sending unitis defective and needs replaced.

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3. With the sender in the up position (tank full), theohmmeter should indicate between 28-32 ohms.If the ohmmeter reading is not within thesespecifications, the sending unit is defective andneeds replaced.

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55-55

Installation1. Install a new sealing gasket, 2, between the

sending unit, 1, and the fuel tank.

2. Carefully place the sending unit, 1, into the fueltank.

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106

3. Secure the sending unit, 2, to the fuel tank usingthe five (5) retaining screws, 1.

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4. Install the fuel level sending unit cover, 2, usingthe two screws, 1.

5. Connect the fuel level sending unit to the wiringharness.


7. Lower and secure the tractor engine cover.

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55-56

FUEL SHUTOFF SOLENOID

The fuel shutoff solenoid, 1, is located on the rightside of the engine, threaded into the rear of the fuelinjection pump, 2. The fuel shutoff solenoid containsa spring-loaded plunger that pushes the injectionpump control rack to the closed (shut-off) positionwhen the solenoid is not energized. When the keyswitch is turned to the �ACC/RUN� or �START�position, the safety stop relay closes completing thecircuit that energizes the solenoid. This retracts theplunger from the injection pump, and the injectionpump control rack moves into the position that allowsthe engine to start.

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109


the battery.

2. Disconnect the wiring harness lead from the fuelshutoff solenoid, 1.

3. Using a pair of pliers, carefully remove the fuelshutoff solenoid, 1, from the fuel injection pump,2.

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2

110

4. Remove and discard the sealing washer, 1,which seals the solenoid, 2, to the fuel injectionpump.

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55-57

Testing1. Using a suitable measuring device, measure the

actuating pin, 1, protrusion distance, �A�, on thesolenoid. The distance should measure between25.5 - 26.4 mm (1.004 - 1.040 in.). If the distanceis not within these specifications, the solenoid isdefective and needs replaced.

1

112

NOTE: When connecting the 12-volt power supply tothe solenoid body, be sure paint is the removed fromthe body. Otherwise, the power will not be transferredto the solenoid.

2. Use jumper wires to connect the positive (+)terminal of a 12-volt power supply to the solenoidlead, 1. Connect the negative terminal of the12-volt power supply to the solenoid body, 2. Theplunger should retract into the solenoid body.

3. Using a suitable measuring device, measure theactuating pin, 1, protrusion distance, �B� on thesolenoid. The distance should measure between11.5 -14.5 mm (0.453 - 0.571 in.). If the distanceis not within these specifications or the plungerdoes not retract, the solenoid is defective andneeds replaced.

3

2

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113

Installation1. Install a new sealing washer, 1, on the solenoid,

2.

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55-58

2. Thread the fuel shutoff solenoid, 1, into the fuelinjection pump, 2. Use pliers to tighten thesolenoid into the injection pump.

3. Connect the wiring harness lead, 3, into the fuelshutoff solenoid, 1.

4. Connect the negative (--) battery cable to thebattery. 1

2

115

Op. 55 414

ENGINE OIL PRESSURE SWITCHThe oil pressure sender, 1, is located on the top frontside of the engine. The switch opens under normal oilpressure (above 6 PSI) and closes when oil pressureis low (below 6 PSI) to complete the ground circuit ofthe oil pressure warning light.

When the ground circuit is completed, the oil pressurewarning light illuminates on the instrument panelwhen the key switch is turned to the �ON� position andgoes out when the engine is started. If the light doesnot go out after the engine has started, first check theengine oil level. If oil level is correct, check for amalfunctioning sender or engine oil pump.

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116

Testing

1. Using an ohmmeter, touch one test lead to thepressure switch terminal, 1, and the other testlead to the switch body, 2.

2. Observe the ohmmeter. There should be little orno resistance, indicating continuity in the switch.If there is no continuity, the switch is defectiveand needs replaced.

NOTE: The following test is not a calibrated test. Thepurpose of the test is to see if the switch opens atpressure.

1. While the test leads are connected to the switch,pressurize the switch oil pressure port, 3, withlow pressure (10-30 psi) compressed air.

2. Observe the ohmmeter. While air pressure isbeing supplied to the oil pressure port, theohmmeter should indicate high resistance, or nocontinuity. If there is continuity, the switch isdefective and needs replaced.

CAUTIONDo not use high pressure compressed air for thefollowing test, otherwise damage may occur tothe oil pressure switch.

1

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55-59

ENGINE COOLANT TEMPERATURESENDING UNITThe coolant temperature sender, 1, is located at theleft front side of the engine inside the thermostathousing. This sender regulates a variable resistanceto ground, which translates into the movement of thetemperature gauge.

1

118

Testing

WARNINGDo not perform sending unit test with tractorengine running. Contact with moving parts willcause bodily injury.

NOTE: Engine paint must be removed from sendingunit body or the ohmmeter will indicate a falsereading when the ohmmeter test lead is touched tosending unit body.

1. Disconnect the main wiring harness terminal, 2,from the coolant temperature sending unit. 2

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2. Using an ohmmeter, touch one test lead to thesending unit terminal, 1. Touch the other test leadto the sending unit body, 2.

∞ 0

1

2

120

3. Observe the ohmmeter for resistance readingsat different engine operating temperatures. Ifresistance is too high, the sending unit usdefective and needs replaced.

Coolant Temperature Sending Unit Temperature

35° C (95° F) 670.0 ± 80 ohms

80° C (176° F) 118.0 ± 6 ohms

105° C (221° F) 54.5 ± 2.7 ohms

115° C (239° F) 42.0 ± 2.5 ohms


55-61

HI/LOW TRANSMISSION RANGE SWITCH(HST)

The transmission range control switch, 1, is atwo-way momentary switch located on the rightcontrol pod on the tractor. This switch changes thehydraulic range of the transmission hydraulic pump.The switch contains two bulbs that illuminate,indicating what hydraulic range the transmissionhydraulic pump is in, �HI� (rabbit) or �LOW� (turtle).When the switch is pushed to the �HI� range, currentis supplied to the transmission range solenoid, whichchanges the position of the swash plate in thehydraulic pump, increasing hydraulic oil flow. Thesolenoid is not energized in the �LOW� position andthe transmission pump operates at normal hydraulicoil flow. The �LOW� transmission setting is the defaultsetting, meaning the tractor will reset to the �LOW�position when the tractor engine is shut off andrestarted.

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The tractors may also be equipped with an optionaljoystick switch, 1, that is mounted on the optionaltwo-spool remote valve.

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Testing1. Carefully pry the range switch, 1, from the right

control pod.

2. Disconnect the tractor wiring harness from theswitch.

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55-62

3. Using an ohmmeter, touch one test probe toterminal 9. Touch the other test probe to terminal10.

4. Observe the ohmmeter. There should beapproximately 19.0 ohms of resistance betweenthe terminals. If resistance is high or off scale, the�LOW� indicator light is faulty and the switchneeds replaced.

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5. Repeat the test for terminals 7 and 8 for the �HI�range indicator light. Replace the switch if testresults are not within the limit specified.

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6. Hold the switch to the �LOW� (turtle) position.Touch one ohmmeter test probe to terminal 2.Touch the remaining ohmmeter test probe toterminal 1.

7. Observe the ohmmeter. There should be little orno resistance, indicating continuity. If the readingshows high resistance, the switch is defectiveand needs replaced.

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55-63

8. Hold the switch in the �HI� (rabbit) position. Touchone ohmmeter test probe to terminal 2. Touch theother ohmmeter test probe to terminal 3.

9. Observe the ohmmeter. There should be little orno resistance, indicating continuity. If the readingshows high resistance, the switch is defectiveand needs replaced.

10. If the switch is good, connect the wiring harnessto the switch and push the switch back into thetractor control pod.

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Optional Testing1. Disconnect the range switch connector, 1, from

the wiring harness. Remove the two (2) screws, 2,retaining the switch to the front remote valvejoystick.

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128

2. Using an ohmmeter, connect one test probe toterminal �C�. Connect the other test probe toterminal �A�.

3. Press the �HI� (rabbit) button and observe theohmmeter. The ohmmeter should show little or noresistance, indicating continuity. If the ohmmetershows high resistance, the switch is defective andneeds replaced.

4. Press the �LOW� (turtle) button and observe theohmmeter. The ohmmeter should show highresistance, indicating no continuity. If there iscontinuity, the switch is defective and needsreplaced.

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A B

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5. Using an ohmmeter, connect one test probe toterminal �C�. Connect the other test probe toterminal �B�.

6. Press the �LOW� (turtle) button and observe theohmmeter. The ohmmeter should show little or noresistance, indicating continuity. If the ohmmetershows high resistance, the switch is defective andneeds replaced.

7. Press the �HI� (rabbit) button and observe theohmmeter. The ohmmeter should show highresistance, indicating no continuity. If there iscontinuity, the switch is defective and needsreplaced.

C

A

B

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130

8. To replace the switch, remove the joystick coverretaining screw, 1, then pull the switch out.

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131

HI/LOW TRANSMISSION RANGE SOLENOID(HST)

Deluxe model TC series tractors are all equippedwith a dual, �HI/LOW� range hydrostatic transmission(HST). The transmission utilizes an electronictransmission range solenoid, 1, to change the swashplate angle within the transmission hydraulic oilpump to �HI� range. This increases hydraulic oil flowthrough the transmission. When the transmission isin �LOW� range the solenoid is not energized and thesolenoid retracts, allowing the swash plate to returnto normal operating angle, reducing hydraulic oil flowin the transmission. The transmission range solenoidis located in a housing on the left side of thetransmission housing. 130002884

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the battery.

NOTE: When removing the solenoid valve body fromthe transmission, be sure not to lose the three (3) orings, 1, that are located in the solenoid valve bodyand the transmission case adapter block

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2. Disconnect the solenoid leads, 3, from the tractorwiring harness.

3. Remove the four (4) 5mm hex head mountingbolts, 1, securing the solenoid valve body, 2, tothe transmission housing. Remove the solenoidvalve body from the transmission adapter block.

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134

Testing1. Remove the solenoid assembly, 1, from the

solenoid valve body, 2. Be sure not to lose anyparts.

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2. Connect an ohmmeter test lead to each of thesolenoid terminals.

3. Observe the ohmmeter. The ohmmeter shouldindicate a resistance of approximately 7.5 - 10.5ohms.

4. If the reading is not within this specification, thesolenoid is defective and needs replaced.

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5. Connect a positive (+) lead from a 12-volt powersource to one of the solenoid terminals, 1.

6. Connect the negative (--) lead from the 12-voltpower source to the remaining solenoid terminal.

7. Observe the solenoid. The solenoid plunger, 2,should extend when voltage is applied. If theplunger does not extend, the solenoid isdefective and need replaced.

8. Disconnect the 12-volt power source from thesolenoid. The plunger should retract immediate-ly. If the plunger does not retract, the solenoid isdefective and needs replaced.

9. If the solenoid is good, install the solenoidassembly back into the solenoid valve body.

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Installation1. Install the solenoid valve assembly, 1, to the

transmission adapter plate and secure with thefour (4) 5mm hex head bolts, 2.

2. Connect the solenoid leads, 3, to the tractorwiring harness.


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ELECTRIC CRUISE CONTROL SWITCH(HST)The electric cruise control switch, 1, is located on theright control pod . The cruise control switch controlscurrent to cruise control magnet. Cruise control isused to maintain the tractor at a constant speedforward or backward. When the cruise control switchis pushed from the �OFF� position to the �SET�position, the control circuit of the cruise control relayis energized. This closes (completes) the functioncircuit of the relay, which supplies power to the cruisecontrol magnet. When the cruise control switch isreleased from the �ON� position, the switch rockersto the �ON� position, which keeps the cruise controlactivated until the switch is pushed to the �OFF�position or the brake pedal or hand brake is engaged.Current to the cruise control relay is interrupted wheneither brake is engaged, which deactivates the cruisecontrol magnet. The cruise control switch isequipped with an indicator light that will illuminatewhen the switch is moved to the �SET� and �ON�position, indicating the cruise control has beenactivated.

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the battery.

2. Carefully pry the switch from the control pod.

3. Disconnect the electric cruise control switch fromthe wiring harness.


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TestingRemove the switch from the wiring harness.

NOTE: The switch terminals are identified on theback of the switch. Numbers 1 and 4 are blank.

Using an ohmmeter, depress the switch to the �SET�position and connect the ohmmeter leads acrossterminals 5 and 6, then across terminals 2 and 3. Ifcontinuity exists across these terminals, the switch isoperating properly.

Next place the switch in the �ON� (middle) positionand connect the ohmmeter leads across terminals 2and 3. If there is continuity, the switch is good.

To test the internal light bulb, connect the ohmmeterleads across terminals 7 and 8 (the switch may be

placed in any of its three positions). The readingshould be between 55 ohms and 60 ohms.

NOTE: The light is not serviced separately. If it doesnot illuminate, replace the switch.

Replace the switch if the correct readings are notobtained during testing.

Installation1. Connect the electric cruise control switch to the

wiring harness.

2. Push the cruise control switch, 1, into the rightcontrol pod.


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CRUISE CONTROL MAGNET (HST)

The cruise control magnet, 1, is located under theright tractor fender and is attached to the hydrostatictransmission (HST) linkage. The cruise controlmagnet is a simple electromagnet. When the cruisecontrol switch is activated, current is supplied to thecruise control magnet and the magnet locks the HSTcontrol linkage in place. This maintains a constanttransmission speed, which translates to a constanttractor ground speed, forward or reverse.


the battery.

2. Disconnect the main wiring harness connector,2, from the cruise control magnet, 1.

3. Remove the two bolts, 3, which secure the cruisecontrol magnet mounting bracket, 4, to thetransmission. Remove the magnet from thetractor.

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TestingUse an ohmmeter to test the cruise control magnet.

1. Disconnect the magnet from the tractor wiringharness and connect the ohmmeter leads to thetwo leads coming from the magnet.

• A meter reading of 11-12 ohms is normal.

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2. Disconnect the ohmmeter from the magnet andapply 12 volts across the magnet leads.

• The surface will become magnetized andattract any ferrous object if the cruise controlmagnet is working properly.

If test results are not as outlined above, replace thecruise control magnet.

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Installation1. Install the cruise control magnet, 1, and mounting

bracket, 4, to the tractor transmission and securethe mounting bracket, 4, to the transmissionusing the two bolts, 3.

2. Connect the main wiring harness connector, 2, tothe cruise control magnet.

3. Connect the negative (−) battery cable to thebattery.

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CRUISE CONTROL BRAKE RELEASESWITCH (HST)

The HST cruise control brake release switch, 1, is apush-button switch located beneath the leftoperator�s platform. The actuator button and theterminals of this switch are sealed to protect theswitch from moisture. The switch is normallyretracted (in), which completes the ground circuit andallows current to flow through the switch. When thebrake pedal is applied, the actuator button isreleased and the switch is opened; which interruptsthe ground path through the switch. The cruisecontrol brake release switch is standard on thedeluxe models.

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Removal


2. Disconnect the wiring harness, 2, from the cruisecontrol brake release switch, 1.

3. Remove the two screws, 3, to remove the cruisecontrol brake release switch, 1, from the tractor.

TestingUse an ohmmeter to test terminals of the cruisecontrol brake release switch for electrical continuity.

NOTE: The cruise control brake release switchwiring harness only makes contact with terminals, A,and, D. Terminals, B, and, C, are not used.

Extended Position (Not Shown)

1. With the cruise control brake release switch inthe �extended� position, continuity should notexist between terminals, A, and, D. If continuityexists between terminals, A, and, D, while theswitch is in the �extended� position, the switch isdefective and needs replaced.

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Retracted Position1. Using an ohmmeter, touch one of the test probes

to terminal, A. Touch the other test probe toterminal, D.

2. Observe the ohmmeter. The ohmmeter shouldshow little or no resistance indicating thatcontinuity exists between terminal, A, andterminal, D. If continuity does not exist betweenterminal A, and terminal, D, the switch isdefective and needs replaced.

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Installation1. Install the cruise control brake release switch, 1,

using the two screws, 3.

2. Connect the wiring harness, 2, to the cruisecontrol brake release switch, 1.

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section 55 - electrical chapter 1 -- electrical

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