JF Series Starting Motor Caterpillar

Assembly Procedure

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Illustration 1	g00718908

1. Position the field winding assembly (20) within the starter motor housing. Put Thread Lock Compound in the threads of the screws (21). Install the screws and tighten the screws to a torque of 36 to 53 N·m (27 to 39 lb ft).

2. Solder the two negative brush leads to the brush holder assembly (18) if the brush leads were removed. Put the brush holder assembly (18) in position on the starting motor housing. Install the two positive brushes to the field winding leads. Solder the two positive brushes to the field winding leads.

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Illustration 2	g00718909

3. Put the armature assembly (19) in position in the starting motor housing. Use the cotter pins (22) to hold the brushes against the brush springs until the commutator is under the brushes.

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Illustration 3	g00719542

4. Install the bushing (17) into the end cover with the driver group.

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Illustration 4	g00718901

5. Put the end cover assembly (14) in position on the starting motor housing.

6. Install the shims (16). Install the C washer (15) .

7. Put Molybdenum Grease on the ends of the armature. Put Molybdenum Grease in the center cover. Install the seal and install the center cover. Put Thread Lock Compound on the threads of the two screws. Install the screws. Tighten the screws to a torque of 9 to 11 N·m (80 to 97 lb in).

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Illustration 5	g00718899

8. Install the bushing into the bearing assembly with the driver group, if necessary. Install the seal (13) into the bearing assembly with the driver group.

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Illustration 6	g00718911

9. Install the bearing assembly (12) over the armature.

10. Put the pinion drive assembly (10) in position on the armature.

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Illustration 7	g00719548

11. Put the seal (11) on the armature shaft. Put the ring in the armature ring slot. Do not scratch the armature shaft. Use multiple position pliers to press the ends of the ring together in the slot. Push a suitable assembly sleeve (23) onto the armature shaft against the ring.

12. Turn the pinion drive assembly (10) and the seal (11) against the ring. Use multiple position pliers (24) to secure the assembly in position. Engage the ring under the seal (11) by hammering against the sleeve (23), as shown. Use a plastic hammer or a rubber hammer.

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Illustration 8	g00719540

13. Install the bushing (9) into the drive housing with the driver group, if necessary.

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Illustration 9	g00718897

14. Position one of the studs (8) into the starting motor housing. Put the shift lever assembly (7) in position on the pinion drive housing.

15. Put the seal and the other stud into the drive housing assembly (6). Put the drive housing assembly over the pinion drive assembly by aligning the marks. At the same time, feed the shift lever assembly (7) into the drive housing.

16. Install stud (8) into the drive housing. Push everything together with studs through the holes in the end cover assembly.

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Illustration 10	g00718894

17. Put Thread Lock Compound on the threads of the studs. Install the washers and the nuts (5). Tighten the nuts to a torque of 9.1 to 12.2 N·m (80.5 to 108 lb in).

18. Put Thread Lock Compound on the shift lever screw. Install the screw through the drive housing and through the shift lever. Install the washer and install the nut (4). Tighten the nut to a torque of 3.2 to 4.0 N·m (28 to 35 lb in).

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Illustration 11	g00718912

19. Compress the spring (25) against the shift lever until the shift lever goes into the slot of the solenoid plunger (3) .

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Illustration 12	g00718914

20. Put solenoid assembly (1) in position over the solenoid plunger. Put Thread Lock Compound on the threads of the three solenoid screws. Install the solenoid screws through the drive housing assembly and into the solenoid assembly (1). Tighten the screws to a torque of 4.6 to 6.0 N·m (41 to 53 lb in) .

21. Connect the field winding strap (2) to the solenoid assembly. Tighten the motor terminal nut to a torque of 28 ± 4 N·m (21 ± 3 lb ft) .

22. Check the armature end play.