312B Excavator Machine Systems Caterpillar

Assembly Procedure

Note: Make sure that all of the parts of the final drive and the travel motor are thoroughly clean and free of dirt and debris prior to assembly. Replace all O-ring seals that are used in the final drive with new O-ring seals. Reassemble the final drive and the travel motor on Tooling (A) .

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Illustration 1	g00581889

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Illustration 2	g00528800

1. Use Tooling (E) to install one half of Duo-cone seal kit (37) into spindle (30). Refer to Disassembly and Assembly, "Duo-Cone Conventional Seals - Install" in this manual.

2. Put a mark (40) on spindle (30). The mark indicates the position of the original balls (33). The mark is used in Step 18.

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Illustration 3	g00581916

3. Use Tooling (G) to check assembled height (X) in at least four places at 90 degree intervals. The difference in height around the ring must not be more than 1.0 mm (.04 inch).

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Illustration 4	g00528793

4. Install bearing kit (38) into ring gear (36) .

   Note: Check the condition of the bearing kit. If the bearing kit is worn or damaged, use a new bearing kit.

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Illustration 5	g00528781

5. Use Tooling (E) to install the second one half of Duo-cone seal kit (37) into ring gear (36). Refer to Disassembly and Assembly, "Duo-Cone Conventional Seals - Install" in this manual.

6. Repeat step 3.

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Illustration 6	g00528772

7. Install spindle (30) onto Tooling (A) .

   Note: Turn over ring gear (36) very carefully. Make sure that Duo-cone seal kit (37) is not dislodged.

8. Install ring gear (36) onto spindle (30) .

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Illustration 7	g00530753

9. Install bearing kit (35) onto spindle (30) .

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Illustration 8	g00527917

10. Install the reaction shaft from Tooling (F) on spindle (30), as shown.

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Illustration 9	g00527930

Note: Lubricate the threads with oil before installation. Use caution. The threads are easy to cross thread.

11. Install spindle nut (34) onto spindle (30) .

12. Install the socket from Tooling (F) on spindle nut (34) .

Note: Rotate the spindle in one direction during the tightening procedure in order to seat the bearings properly.

13. Use Tooling (F) to tighten spindle nut (34) to a torque of 1500 N·m (1100 lb ft).

14. Mark spindle nut (34) in relation to spindle (30) .

    Note: Do not confuse this mark with mark (40) for the location of balls (33) .

15. Tighten spindle nut (34) to a torque of 2500 N·m (1840 lb ft).

16. Loosen spindle nut (34) so that the mark on the spindle nut is 5 to 10 degrees from the mark on the spindle.

17. Tighten spindle nut (34) to a torque of 1500 N·m (1100 lb ft).

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Illustration 10	g00530793

18. Measure the distance from the new bolt (31) to mark (40). The distance must be at least 10 mm (.4 inch). If the distance is less than 10 mm (.4 inch), use a new spindle nut (34) .

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Illustration 11	g00581917

19. Use Tooling (H) to peen the threads of spindle (30) .

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Illustration 12	g00528079

20. Install bolt (31), tab (32) and ball (33) into spindle nut (34). Tighten bolt (31) to a torque of 8.5 N·m (6 lb ft).

    Note: Use the access hole in ring gear (35) to install bolt (31). Ring gear (35) can be rotated in order to align the access hole with bolt (31) .

    Note: Bend the long tab on tab (32) over the "ear" of ring gear (35). Bend the short tab of tab (32) over bolt (31) .

21. Repeat step 19 and step 20 in order to install the remaining bolt assembly.

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Illustration 13	g00527656

22. If necessary, heat gears (29) to 135 °C (275 °F). Install gears (29) on spindle (30). Use snap ring pliers to install snap ring (28) that secures planetary gear (29) to spindle (30) .

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Illustration 14	g00527629

23. Install sun gear (27) into planetary carrier (25) .

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Illustration 15	g00527625

24. Use snap ring pliers to install snap ring (26) on sun gear (27) .

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Illustration 16	g00527613

25. If necessary, heat planetary gears (24) to 135 °C (275 °F). Install the disks and planetary gears (24) onto the planetary carrier.

26. Use snap ring pliers to install snap rings (23) onto planetary gears (24) .

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Illustration 17	g00527606

27. Install the second stage of the planetary gear assembly (22) into final drive.

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Illustration 18	g00527597

28. Install sun gear (21) into planetary carrier (19) .

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Illustration 19	g00527501

29. If necessary, heat planetary gears (18) to 135 °C (275 °F). Install three planetary gears (18) on the planetary carrier. Use snap ring pliers to install three snap rings (17) that secure three planetary gears (18) to the planetary carrier.

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Illustration 20	g00527500

30. Install the first stage of planetary gear assembly (16) into the final drive.

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Illustration 21	g00527496

31. Install sun gear shaft (15) into the final drive.

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Illustration 22	g00527492

32. Install a new O-ring seal into cover (14). Install twelve bolts (13) that secure cover (14) to the final drive. Tighten twelve bolts (13) to a torque of 25 ± 6 N·m (18 ± 4 lb ft).

33. Use lifting straps and Tooling (D) in order to lift the final drive off Tooling (A) .

34. Carefully rotate the final drive so that the brake is up.

35. Fasten the final drive to Tooling (A) .

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Illustration 23	g00527410

36. Install seals (12) into piston (5) .

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Illustration 24	g00527398

37. Install seal (10) into spindle (11) .

38. Use Tooling (C) to install snap ring (9) .

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Illustration 25	g00527404

39. Install supporting ring (8) .

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Illustration 26	g00527355

40. Install brake disks and plates (7) .

    Note: There are six disks and five plates. Start the installation with a disk. Alternate between disks and plates. End the installation with a disk.

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Illustration 27	g00527353

41. Install shaft link (6) .

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Illustration 28	g00527337

Note: Lubricate the seals before installing the piston. Install the piston carefully in order to prevent damage to the seals.

42. Install piston (5) .

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Illustration 29	g00527299

43. Install spacer ring (3) and twenty springs (4) .

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Illustration 30	g00527283

44. Use Tooling (B) to compress the brake assembly. Use Tooling (C) to install the retaining ring.

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Illustration 31	g00530949
Tooling (J) (1) Hydraulic test adapter (2) O-ring seal (3) Nipple assembly (4) Coupler assembly (5) Hose assembly (6) Pressure gauge (7) Hand pump (8) Fitting (9) Valve (10) Tee (11) Nipple assembly

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Illustration 32	g00530964

45. Install Tooling (J) into the oil supply port (42) .

46. Apply 3495 kPa (510 psi) for a minimum of 3 minutes. If the pressure falls, the piston seals must be checked.

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Illustration 33	g00526930

47. Install the travel motor on the final drive. Install two bolts (2) .

48. Fill the final drive with hydraulic oil. The capacity of the final drive is 2.5 L ( .66 US gal). Refer to Operation and Maintenance Manual, "Lubricant Viscosities and Refill Capacities" for the correct filling procedure and the correct level for the final drive.

End By: Install the final drive. Refer to Disassembly and Assembly, "Final Drive - Install" in this manual.