385B and 5090B Excavators Excavator Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove the swing drive. Refer to Disassembly and Assembly, "Swing Drive - Remove and Install".

Note: The disassembly procedure is identical for both swing drives.

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NOTICE
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

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Illustration 1	g00869217

1. Use a suitable device and a hoist to place the swing drive on Tooling (A). The weight of the swing drive is approximately 510 kg (1125 lb).

2. Open the drain valve, and drain the oil from the swing drive into a suitable container for storage or disposal. The capacity of the swing drive is 19 L (5 US gal). If necessary, remove the drain valve from the swing drive housing.
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   Illustration 2	g00869266

3. Remove bolts (1) from cover (2).
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   Illustration 3	g00869281

4. Remove sun gear (3) from carrier assembly (4).
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   Illustration 4	g00869294

5. Remove spacer (5) from carrier assembly (4).

6. Use two people to remove carrier assembly (4) from the swing drive. The weight of the carrier assembly is approximately 36 kg (80 lb).

7. Disassemble carrier assembly (4).
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   Illustration 5	g00869309

   1. Use a hammer and a punch to drive spring pin (6) into planetary shaft (7).
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      Illustration 6	g00869315

   2. Remove planetary shaft (7), thrust washer (8), thrust washer (11), and planetary gear (9) from the carrier.

   3. Remove bearing (10) from planetary gear (9).

   4. Use a hammer and a punch in order to remove spring pin (6) from the planetary shaft (7).

   5. Repeat Steps 7.a through 7.d in order to remove the other three planetary gears from the carrier assembly.
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   Illustration 7	g00869377

8. Use a screwdriver in order to remove upper retaining ring (12) from sun gear (13).

9. Remove sun gear (13) from carrier assembly (4).
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   Illustration 8	g00869383

10. Remove retaining ring (14) from the sun gear.
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    Illustration 9	g00869390

11. Use Tooling (B) and a hoist to remove ring gear (15) from swing drive housing (16). The weight of the ring gear is approximately 80 kg (175 lb).
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    Illustration 10	g00869406

12. Remove spacer (17) from carrier assembly (18).
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    Illustration 11	g00869460

13. Use two screwdrivers to remove retaining ring (19).
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    Illustration 12	g00869464

14. Use a hoist and a lifting sling to remove carrier assembly (20). The weight of the carrier assembly is approximately 68 kg (150 lb).

15. Disassemble carrier assembly (20).
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    Illustration 13	g00869477

    1. Use a hammer and a punch to drive spring pin (21) into planetary shaft (22).
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       Illustration 14	g00869483

    2. Remove planetary shaft (22), thrust washer (23), thrust washer (27), and planetary gear (25) from the carrier.

    3. Remove bearing (24) and (26) from planetary gear (25).

    4. Use a hammer and a punch to remove spring pin (21) from planetary shaft (22).

    5. Repeat Steps 15.a through 15.d in order to remove the other three planetary gears from the carrier assembly.
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    Illustration 15	g00869500

16. Use Tooling (C) to remove retaining ring (28).
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    Illustration 16	g00869545

17. Place swing drive housing (16) sideways. Remove two bolts (30) from bearing cage (29).
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    Illustration 17	g00869554

18. Put swing drive housing (16) in a press. The combined weight of the swing drive housing, the pinion shaft, and the bearing cage is approximately 300 kg (660 lb).
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    Illustration 18	g00869551

19. Place two Steel Supports (d) under the face of bearing cage (29).

20. Place a wood block directly under the pinion shaft (31). This will prevent the pinion shaft from falling, while the shaft is pressed out of the swing drive housing.

    Note: Use care when components are pushed from the swing drive housing. Avoid injury to personnel. Also, avoid damage to components.

21. Push pinion shaft (31) from the swing drive housing. The weight of the pinion shaft is approximately 77 kg (170 lb).

22. Remove the swing drive housing and the pinion shaft from the press. The weight of the swing drive housing is approximately 222 kg (490 lb). The weight of the pinion shaft is approximately 77 kg (170 lb).
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    Illustration 19	g00869569

23. Place swing drive housing (16) sideways. Remove the remaining six bolts (30) from the swing drive. Remove bearing cage (29) from the swing drive.
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    Illustration 20	g00869899

24. Remove two lip type seals (32) and O-ring seal (33) from bearing cage (29).
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    Illustration 21	g00869650

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    Illustration 22	g00869654

    Note: Use care when the components are pushed from the swing drive housing. Avoid injury to personnel. Also, avoid damage to components.

25. Place swing drive (16) in a press. Use Tooling (D) to push bearing (34), spacer (35), and bearing (36) from the swing drive. The weight of the swing drive is approximately 150 kg (330 lb). The weight of bearing (34) is approximately 11 kg (25 lb). The weight of spacer (35) is approximately 4 kg (8 lb). The weight of bearing (36) is approximately 35 kg (77 lb).