330D, 336D, 336D2, 340D and 340D2 Excavators and 336D MHPU Mobile Hydraulic Power Unit Machine Systems Final Drive - Assemble - Type-One Caterpillar

Assembly Procedure

Note: Cleanliness is an important factor. Before assembly, all parts should be thoroughly cleaned in cleaning fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts. Lint may be deposited on the parts which may cause later trouble. Inspect all parts. If any parts are worn or damaged, use new parts for replacement. All disassembly and all assembly procedures must be performed on a clean work surface and in a clean hydraulic area. Keep cleaned parts covered and protected at all times.

Note: O-ring seals, gaskets, and seals should always be replaced. A used O-ring seal may not have the same sealing properties as a new O-ring. Use Tooling (K) during the assembly procedure.

Note: Apply a light film of hydraulic oil to all components before assembly.

Note: Some of the images that are in this procedure do not show the sprocket assembly that is attached to the final drive housing. If necessary, the weights that are given include the weight of the sprocket assembly.

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Illustration 1	g01147975

1. Apply Tooling (P) to the outer diameter of the bearings.

2. Use a suitable press to Install bearings (40) and (41). Make sure that bearing (41) and bearing (40) contact the counterbore in housing (36).

3. Use Tooling (N) to install Duo-Cone seal (39B).
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   Illustration 2	g01147981

4. Use Tooling (N) to install Duo-Cone seal (39A) onto housing (38).
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   Illustration 3	g01147930

5. Use Tooling (E) and a suitable lifting device to install housing (36) onto housing (38). The weight of housing (36) is approximately 100 kg (220 lb).

6. Remove Tooling (E) from housing (36).
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   Illustration 4	g01147724

7. Install stopper plate (35). Do not tighten stopper plate assembly (35) at this time.

   Note: Stopper plate (35) will secure housing (36) to housing (38).

8. Install Tooling (E) and a suitable lifting device to housing (36). The combined weight of housing assembly (36) and (38) is approximately 120 kg (265 lb). Install housing assembly (36) and (38) in a suitable press.

9. Remove stopper plate (35).
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   Illustration 5	g01147727

10. Assemble Tooling (D), as shown.
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    Illustration 6	g01147731

11. Install Tooling (D) into housing (36), as shown.

12. Apply a force of 4000 kg (8818 lb) to the top of Tooling (D). Rotate housing (36) to seat the bearings.

13. Reduce the force on the top of Tooling (D) to 3000 kg (6615 lb).
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    Illustration 7	g01147737

14. Use Tooling (H) to take a measurement in three locations. Average the three measurements and record the average measurement as Dimension (W).

15. Remove Tooling (D).

16. Separate Tooling (D).
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    Illustration 8	g01147743

17. Use a micrometer to measure the thickness at three locations of the spacer from Tooling (D). Record the average measurement as Dimension (X).
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    Illustration 9	g01147742

18. Use a micrometer to measure the thickness at three locations of stopper plate (35). Record the average measurement as Dimension (Y).

19. Subtract Dimension (X) from Dimension (Y) and record this figure as Dimension (Z).
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    Illustration 10	g01147724

20. Install stopper plate (35) onto housing (38). Do not tighten stopper plate (35) at this time. Stopper plate (35) will secure the final drive assembly while the final drive assembly is repositioned onto Tooling (A).

21. Use Tooling (E) and a suitable lifting device to reposition the final drive assembly onto Tooling (A). The combined weight of housing assembly (36) and (38) is approximately 120 kg (265 lb).

22. Secure the final drive assembly to Tooling (A).
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    Illustration 11	g01148004

23. Secure the spanner socket from Tooling (D) to stopper plate (35).

24. to determine the final bearing preload, add Dimension (W) to Dimension (Z) and record this figure as Dimension (V).

25. Use Tooling (H) to measure the distance in three locations.

26. Tighten stopper plate (35) until the average of the measurements is equal to Dimension (V).

27. Remove Tooling (D).
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    Illustration 12	g01372092

28. Install Tooling (Q) and a suitable vacuum onto stopper plate (35).
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    Illustration 13	g01147789

29. Use a suitable drill and Tooling (Q) to drill a hole to the depth of 15 mm (0.6 inch) in the stopper plate and in housing (38).
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    Illustration 14	g01147796

30. Install dowel (37).
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    Illustration 15	g01147650

31. Apply Tooling (R) to bolts (35A). Install plate (35B) and bolts (35A).

32. Repeat Steps 28 through 31 for the opposite side of stopper plate (35).
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    Illustration 16	g00781807

33. Install O-ring seal (34) on housing (36).
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    Illustration 17	g00781730

34. Install gear (33) on housing (36).
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    Illustration 18	g00781719

35. Assemble carrier assembly (27), as follows.
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    Illustration 19	g00781607

    1. Use a deburring tool to remove the metal burr from the openings in the carrier.

    2. Install two bearings (31) in planetary gear (32).

    3. Install thrust washers (30) and planetary gear (32) in the carrier assembly.

    4. Install planetary shaft (28) in the carrier assembly.

    5. Align the split in spring pin (29) to the top or to the bottom. Make a stake mark on each side of the spring pin hole in the carrier. Each stake mark should be approximately 1.50 mm (0.059 inch) from the outside diameter of the spring pin hole.
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       Illustration 20	g00903073

    6. Drive spring pin (29) into planetary shaft (28) with a hammer and a punch.

36. Repeat Steps 35.a through 35.e to install the other two planetary gears in the carrier.
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    Illustration 21	g00781559

37. Use two people to install carrier assembly (27) in gear (33). The weight of carrier assembly (27) is approximately 38 kg (85 lb).
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    Illustration 22	g00781529

38. Install spacer (26). Install gear (25).
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    Illustration 23	g01148010

39. Assemble carrier assembly (19), as follows.
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    Illustration 24	g00781516

    1. Use a deburring tool to remove the metal burr from the openings in the carrier.

    2. Install bearing (23) in planetary gear (24).

    3. Install thrust washers (22) and planetary gear (24) in the carrier assembly.

    4. Install planetary shaft (21) in the carrier assembly.
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       Illustration 25	g00903073

    5. Drive spring pin (20) into planetary shaft (21) with a hammer and a punch.
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       Illustration 26	g00879368

    6. Align the split in the spring pin to the top or to the bottom. Make a stake mark on each side of the spring pin hole in the carrier. Each stake mark should be approximately 1.50 mm (0.059 inch) from the outside diameter of the spring pin hole.

    7. Repeat Steps 39.a through 39.f to install the other two planetary gears in the carrier.
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    Illustration 27	g01148011

40. Install carrier assembly (19) into gear (33).

41. Install retaining ring (18).
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    Illustration 28	g00781412

42. Install spacer (17). Install gear (16).
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    Illustration 29	g01389598

    Note: Make sure that the oil passages in the shafts are oriented toward the center of carrier assembly (15).

43. Raise the temperature of carrier assembly (15). Lower the temperature of the shafts. Install the shafts into carrier assembly (15) until the groove of the shafts is at Dimension (A). Dimension (A) equals 25.00 ± 0.10 mm (0.984 ± 0.004 inch).

44. Make eight stake marks at distance of Dimension (C) from each shaft. Dimension (C) equals 2.0 ± 1.0 mm (0.08 ± 0.04 inch). The width of each stake mark should be equal to Dimension (B). Dimension (B) equals 4.0 ± 1.0 mm (0.16 ± 0.04 inch).
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    Illustration 30	g00781407

45. Assemble carrier assembly (15), as follows.

    1. Install carrier assembly in position on gear (16).
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       Illustration 31	g00781401

    2. Install retaining ring (14) onto gear (16).
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       Illustration 32	g00780432

    3. Install washer (11). Install bearing assembly (13). Install gear (12). Install washer (11). Install retaining ring (10) with Tooling (C).

    4. Repeat Steps 45.a through 45.c for the other two planetary gears.
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    Illustration 33	g00780428

46. Install spacer (9). Install gear (8).
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    Illustration 34	g00879365

47. Install O-ring seal (7) on plugs (4).
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    Illustration 35	g00879362

48. Install plugs (4) and spacer (6) in cover (2).

49. Position gear (5). Install bolts (3).
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    Illustration 36	g00708090

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    Illustration 37	g00708089

50. Place a piece of solder in the center of gear (8).

    Note: You may need to apply some grease to the solder to keep the solder in position on gear (8).

51. Use Tooling (B) and a suitable lifting device to Install cover (2). The weight of cover (2) is approximately 32 kg (70 lb).

52. Install four bolts (1) at 90 degrees from each other. Tighten bolts (1) in a crisscross pattern to a torque of 420 ± 60 N·m (310 ± 44 lb ft). Turn bolts (1) anadditional60 ± 5 degrees.

53. Remove bolts (1).

54. Use Tooling (B) and a suitable lifting device to remove cover (2). The weight of cover (2) is approximately 32 kg (70 lb).

55. Use a micrometer to measure the thickness of the solder. Record this measurement to determine the thickness of the shims for plate (6). Adjust the shims to obtain a clearance of 1.000 + 1.000 mm (0.0394 + 0.0394 inch) between plate (6) and gear (8).

56. Apply Tooling (M) to the mating surfaces of cover (2) and the housing.

57. Use Tooling (B) and a suitable lifting device to Install cover (2). The weight of cover (2) is approximately 32 kg (70 lb).

58. Apply Tooling (R) to bolts (1). Install bolts (1) and the washers. Tighten bolts (1) in a crisscross pattern to a torque of 900 ± 100 N·m (664 ± 74 lb ft).
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    Illustration 38	g00783362

59. Remove plug (4) (not shown). Attach Tooling (J) to cover (2). Reduce the air pressure at the source to 103 kPa (15 psi). Apply air pressure to Tooling (J). This air will test the Duo-Cone seals.

60. Use the ball valve on Tooling (J) to eliminate the air pressure to the final drive. A pressure of 98 kPa (14.2 psi) must be maintained for 30 seconds.

61. Remove Tooling (J). Install plug (6). Torque plug (6) to 80 ± 10 N·m (59 ± 7 lb ft).

62. Remove the final drive from Tooling (A). The weight of the final drive assembly is approximately 310 kg (683 lb).

End By:

1. If necessary, install the final drive sprocket. Refer to Disassembly and Assembly, "Final Drive Sprocket - Remove and Install".

2. Install the final drive. Refer to Disassembly and Assembly, "Final Drive - Install".