725C Articulated Truck Power Train Caterpillar

Disassembly Procedure

Start By:

1. Remove the center differential assembly.

1. Apply location marks on all housings and case assemblies for assembly purposes.
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   Illustration 1	g01196303

2. Install Tooling (C) to yoke (1). Use a suitable lifting device in order to install the differential and bevel gear assembly (2) to Tooling (A). The weight of the differential and bevel gear assembly (2) is approximately 385 kg (850 lb).

3. Remove Tooling (C) and the suitable lifting device from yoke (1).

4. Rotate the differential and bevel gear assembly by 90 degrees.
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   Illustration 2	g00844674

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   Personal injury can result from being struck by parts propelled by a released spring force. Make sure to wear all necessary protective equipment. Follow the recommended procedure and use all recommended tooling to release the spring force.

5. Remove bolts (3) and the washers that hold housing (4) for the differential lock in place.

6. Remove housing (4) for the differential lock from the differential and bevel gear assembly.
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   Illustration 3	g00511032

7. Remove bearing (5).
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   Illustration 4	g00511036

8. Remove clutch plate (6).
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   Illustration 5	g00511092

9. Remove discs and plates (7). Keep discs and plates (7) in order.
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   Illustration 6	g00511109

10. Remove gear (8).
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    Illustration 7	g00511131

11. Remove hub (9).

    Note: Three coil springs are loosely attached to hub (9). The coil springs do not need to be removed. The coil springs should be inspected for damage. Replace all three of the coil springs if any of the springs are damaged.

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    Illustration 8	g00511378

12. Remove bearing (10).
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    Illustration 9	g00511386

13. Remove four Torx screws (12). Remove plate (11) from the differential assembly.
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    Illustration 10	g00511394

14. Rotate the differential and bevel gear assembly by 90 degrees. Remove bolts (13) and the washers that hold bearing caps (14) in place. Remove the bearing caps from the differential and bevel gear assembly.
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    Illustration 11	g00511445

15. Attach a suitable lifting device to differential assembly (15). The weight of differential assembly (15) is approximately 89 kg (196 lb). Remove the differential assembly (15).

    Note: Do not allow bearing cups (16) and the adjustment rings of the bearings to fall from the differential assembly.

16. Remove outer bearing cups (16) and the adjustment rings.
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    Illustration 12	g01430960

17. Position differential assembly (15) on a clean work surface. Use Tooling (B) in order to remove bearing cone (17). Rotate the differential assembly by 180 degrees. Use the Tooling (B) in order to remove the bearing cone on the opposite side.
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    Illustration 13	g00514465

18. Remove bolts (18) and the washers that secure bevel gear (19) to differential assembly (15).
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    Illustration 14	g00514466

19. Use Tooling (D) and a suitable press in order to remove bevel gear (19) from the differential assembly. Cushion the differential assembly in order to prevent damage to the differential assembly when the differential assembly drops.
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    Illustration 15	g00514935

20. Remove bolts (21) and the washers that secure case assembly (20) to hub (22). Rotate the differential assembly by 180 degrees. Remove hub (22) from case assembly (20).

    Note: Place location marks on the differential assembly before disassembly.

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    Illustration 16	g00514937

21. Remove thrust washer (23) from bevel gear (24). Remove bevel gear (24) from case assembly (20).
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    Illustration 17	g01431266

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    Illustration 18	g01431267

22. Remove spider (25), thrust washers (26), and gears (27) as a unit from case assembly (20).

23. Remove thrust washers (26) and gears (27) from spider (25).
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    Illustration 19	g01431268

24. Remove bearings (28) from gears (27).
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    Illustration 20	g01430646

25. Remove bevel gear (29) from case assembly (20).
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    Illustration 21	g01430648

26. Remove thrust washer (30) from bevel gear (29).
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    Illustration 22	g01431271

27. Rotate the differential and bevel gear assembly (2) by 180 degrees. Remove bolt (31) and washer (32). Remove yoke (1) and the brake disc from the differential. The weight of yoke (1) and the brake disc is approximately 24 kg (53 lb). Remove yoke (1) and the brake disc.
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    Illustration 23	g00845751

28. Rotate the differential and bevel gear assembly (2) by 180 degrees. Install bearing caps (14). Install bolts (13) and the washers in order to hold Tooling (E) in place. Tooling (E) prevents the pinion shaft from falling during removal of the pinion shaft.
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    Illustration 24	g01431272

29. Tooling (E) has adjusting screw (34). Turn screw (34) until the screw contacts pinion shaft (33).
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    Illustration 25	g01431288

30. Rotate the differential and bevel gear assembly (2) by 180 degrees. Remove bolts (36) and the washers from seal retainer (35). Remove the seal retainer. Inspect the O-ring seal for the seal retainer. Replace the O-ring seal if the O-ring seal is damaged.
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    Illustration 26	g01431291

31. Use Tooling (H) and a hammer in order to remove seal (37) from seal retainer (35).
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    Illustration 27	g01429377

32. Remove bolts (38) and the washers. Remove cage (39).
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    Illustration 28	g01429378

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    Illustration 29	g01429740

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    Illustration 30	g01429849

33. Use Tooling (S) in order to remove retaining ring (41). Remove retaining ring (41). Use Tooling (F) in order to remove locknut (40) from pinion shaft (33). Remove locking washer (42) and notched washer (43) from pinion shaft (33).

34. Remove bolts (44) and the washers from bearing cage (45). Bearing cage (45) has four threaded holes for inserting forcing screws. Use Tooling (T) in order to remove the bearing cage (45) and the seal from the differential carrier. Remove bearing cage (45) and the seal.
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    Illustration 31	g03801650

35. Remove retaining ring (47), gear (48), and spacer (49) from pinion shaft (33).
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    Illustration 32	g01429859

36. Remove gear (52) from the differential and bevel gear assembly (2).
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    Illustration 33	g01429861
    Typical Example

37. Use Tooling (B) in order to remove bearing cone (53) from gear (52). Repeat the procedure in order to remove bearing cone (50) on the opposite end of gear (52).
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    Illustration 34	g01429863

38. Remove bearing cone (55). Remove the bearing cups (51) and (54) from bearing cage (45). The bearing cups are a press fit.
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    Illustration 35	g00845807

39. Rotate the differential and bevel gear assembly until you can remove bolts (13) and the washers in order to remove bearing caps (14). Remove Tooling (E). Remove pinion shaft (33).
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    Illustration 36	g01429864

40. Remove outer bearing cup (57) for the inner pinion bearing with a suitable driver. Remove shims (56) that are located under outer bearing cup (57).
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    Illustration 37	g01429865
    Typical Example

41. Install Tooling (G). Position pinion shaft (33) in a suitable press in order to remove bearing cone (58).

    Note: Do not allow pinion shaft (33) to fall.

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    Illustration 38	g01429867

42. Remove bolts (59), the washers, and spacers which hold piston (60) in housing (4). Remove piston (60).
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    Illustration 39	g01429868

43. Remove O-ring seals (61) and (62) from piston (60). The O-ring seals should be replaced with new O-ring seals.