JF Series Starting Motor Caterpillar

Disassembly Procedure

Remove the starting motor from the machine. The procedure for removal of the starting motor may vary slightly with a different series of starting motor.

Illustration 1	g00718892

1. Disconnect the field winding strap (2) from the solenoid assembly (1) .

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Illustration 2	g00718893

2. Disconnect the solenoid plunger and remove the solenoid plunger (3) from the shift lever. To remove the plunger, lift the plunger slightly.

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Illustration 3	g00718894

3. Scribe a line on the drive and the starting motor housings for proper alignment at assembly. Remove the end cover nuts (5) and the washers. Remove the shift lever nut (4), the washer, and the screw.

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Illustration 4	g00718897

4. Separate the two halves of the starting motor. It may be necessary to remove one stud (8) from the drive housing in order to remove the shift lever assembly (7) and drive housing assembly (6). Do not damage the seal.

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Illustration 5	g00719540

5. If necessary, remove the bushing (9) from the drive housing.

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Illustration 6	g00718898

6. Remove the seal (11) from the ring with a suitable sleeve. Remove the ring, the seal (11), and the pinion drive assembly (10) from the armature.

7. Remove the bearing assembly (12) .

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Illustration 7	g00718899

8. Remove the seal (13) and remove the bushing from the bearing assembly, if necessary.

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Illustration 8	g00718901

9. Remove the two screws and the center cover from the end cover assembly. Remove the seal.

10. Remove the C washer (15) from the end of the armature. Remove the shims (16) from the end of the armature.

11. Remove the end cover assembly (14) .

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Illustration 9	g00719542

12. Remove the bushing (17) from the end cover, if necessary.

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Illustration 10	g00718902

13. Remove the armature assembly (19) from the starting motor housing and the brush holder assembly (18) .

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Illustration 11	g00718908

14. Unsolder the field winding leads from the positive brush leads. Remove the brush holder assembly (18). Unsolder the negative brushes from the brush holder, if necessary.

15. Remove the screws (21) from the starting motor housing. Remove the field winding assembly (20) from the starting motor housing. Use an impact driver to remove the screws (21), if necessary.

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NOTICE
Do not use a liquid cleaning agent to clean the armature assembly, field winding (coil) assembly, or pinion drive assembly. Liquids can damage these parts. Use only compressed air to clean them.

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Personal injury can result from air pressure. Personal injury can result without following proper procedure. When using pressure air, wear a protective face shield and protective clothing. Maximum air pressure at the nozzle must be less than 205 kPa (30 psi) for cleaning purposes.

16. Clean the following items with compressed air:
    • armature assembly

    • field winding assembly

    • pinion drive assembly

    • housings

    • solenoid assembly

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To prevent personal injury or death from a possible explosion, make sure that all parts are thoroughly dry in order to eliminate formation of gas within the starter.

17. Wash parts such as screws, hardware, and the shaft of the armature with a commercially available cleaning agent. Dry all parts thoroughly.

18. Inspect all parts for wear and for damage.