307E2 Mini Hydraulic Excavator Machine Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove final drive and travel motor assembly.

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Illustration 1	g03618337

1. Remove relief valves (2) from motor cover (1).
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   Illustration 2	g03618343

2. Remove backup rings (5), O-ring seal (4), and O-ring seal (3) from relief valves (2).
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   Illustration 3	g03618378

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   Illustration 4	g03618382

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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.

3. Remove plugs (6), O-ring seals (7), springs (8), washers (9), and spool (10) from motor cover (1).
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   Illustration 5	g03618395

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   Illustration 6	g03618437

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   Illustration 7	g03618783

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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.

   Note: Note the order and orientation of the spools and spring for installation purposes.

4. Remove plugs (11), plugs (12), and the O-ring seals from motor cover (1).

5. Remove O-ring seals (13) from plugs (11).

6. Remove spool (14) from motor cover (1).

7. Remove spool (15), spool (16), spring (17), and spool (18) from motor cover (1).
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   Illustration 8	g03618844

8. Remove plugs (19) and the O-ring seals from motor cover (1).
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   Illustration 9	g03618858

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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.

9. Remove bolts (20) and motor cover (1) from motor housing (21).
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   Illustration 10	g03618900

10. Remove springs (22), port plate (23), and bearing (24) from motor cover (1).
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    Illustration 11	g03620038

11. Remove O-ring seals (26) and O-ring seal (27) from motor housing (25).
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    Illustration 12	g03621936

12. Install suitable straps in order to prevent piston (28) from flying out of the motor housing.

13. Use a suitable air supply at Port (X) to force piston (28) out of motor housing (25). Remove suitable straps and remove piston (28).
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    Illustration 13	g03622017

14. Remove backup rings (29) and O-ring seals (30) from piston (28).
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    Illustration 14	g03623575

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    Illustration 15	g03623597

15. Remove plates (31), friction discs (32), and spacer (33) from motor housing (25).
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    Illustration 16	g03623679

16. Place motor housing (25) and the final drive housing on side to remove rotating group (34).
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    Illustration 17	g03623683

17. Remove pistons (35), plate (36), and spherical bearing (37) from barrel assembly (38).
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    Illustration 18	g03623719

18. Remove pins (39) from barrel assembly (38).
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    Illustration 19	g03623756

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    Illustration 20	g03623778

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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.

19. Use Tooling (A) and a suitable press to remove retaining ring (40), washer (43), spring (42), and washer (41) from barrel assembly (38).
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    Illustration 21	g03623797

20. Remove swashplate (44) from motor housing (25).
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    Illustration 22	g03623883

21. Remove balls (45) from motor housing (25).

22. Apply low-pressure air to Port (Y) to remove control piston (46) from motor housing (25).
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    Illustration 23	g03623902

23. Place motor housing (25) and final drive housing (48) on to suitable cribbing to avoid damage to the shaft.

24. Remove plugs (47) and the O-ring seals from final drive housing (48).
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    Illustration 24	g03624016

25. Find the split in ring (50) and rotate ring (50) until the break reaches a plug location in cover (49). Proceed to feed ring (50) around until removal is possible.

26. Remove cover (49).
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    Illustration 25	g03624178

27. Remove shaft wear ring (51) from cover (49).
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    Illustration 26	g03624179

28. Remove O-ring seal (52) and gear (53) from final drive housing (48).
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    Illustration 27	g03624184

29. Remove retaining rings (54) and washers (55).
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    Illustration 28	g03624189

30. Remove pins (56) and gears (57).
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    Illustration 29	g03631784

31. Remove bearing guides (59), washers (60), and carrier (61) from the final drive housing.

32. Remove retaining ring (58) and shaft (62) from carrier (61).
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    Illustration 30	g03631738

33. Remove thrust washer (64), retaining rings (63), and plate (65).
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    Illustration 31	g03631863

34. Remove washers (66) and gears (67).
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    Illustration 32	g03631876

35. Remove pins (68).
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    Illustration 33	g03631281

36. Remove bearing guides (69), washers (70), and plate (71).
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    Illustration 34	g03631297

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    Illustration 35	g03624441

37. Use Tooling (B) and a suitable press to compress final drive housing (48).

38. Use Tooling (C) to remove retaining ring (72).
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    Illustration 36	g03624459

39. Use Tooling (D) and a suitable lifting device to remove motor housing (25) from final drive housing (48).
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    Illustration 37	g03624462

40. Use Tooling (A) and a suitable press to remove the shaft assembly from motor housing (25).
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    Illustration 38	g03631298

41. Use Tooling (E) and a suitable press to remove bearing (74) from shaft assembly (73).
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    Illustration 39	g03625756

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    Illustration 40	g03631299

42. Use Tooling (A) and a suitable press to remove lip seal (75) from motor housing (25).
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    Illustration 41	g03631300

43. Remove Duo-Cone seal (76A) from motor housing (25).
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    Illustration 42	g03631301

44. Remove Duo-Cone seal (76B) from final drive housing (48).

45. Remove roller bearings (77).

    Note: Damage to bearings (77) will occur upon removal.