307B Excavator Machine Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove the final drive and the travel motor. Refer to Disassembly and Assembly, "Final Drive and Travel Motor - Remove" in this manual.

1. Thoroughly clean the outside of the travel motor and the final drive prior to disassembly.
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   Illustration 1	g00610285

2. Remove bolts (1) that hold sprocket (2) to the final drive. Use two persons to remove the sprocket from the final drive. The weight of the sprocket is approximately 23 kg (50 lb).

3. Put an alignment mark across the section of the travel motor and the final drive for assembly purposes. The parts must be reinstalled in the original locations of the parts.
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   NOTICE
   Failure to follow the recommended procedure or the specified tooling that is required for the procedure could result in damage to components. To avoid component damage, follow the recommended procedure using the recommended tools.

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   Illustration 2	g00610299

4. Fasten the final drive and the travel motor to Tooling (A). Make sure that the outer cover is facing upward. The weight of the final drive and the travel motor is 90 kg (200 lb).

5. Use a screwdriver or use a 0.25 mm (.010 inch) feeler gauge to a 0.38 mm (.015 inch) feeler gauge in order to remove ring (3) from the groove between the cover and the final drive housing.
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   Illustration 3	g00610345

6. Remove the filler plug and the drain plug from the cover. Install Tooling (B) in the filler hole and the drain hole. Use Tooling (B) to remove cover (4) from the final drive. Remove Tooling (B) from the cover. Install the filler plug and the drain plug in the cover.
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   Illustration 4	g00610355

7. Remove O-ring seal (5) from cover (4).
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   Illustration 5	g00610366

8. Remove three retaining rings (6). Remove three gears (7). Remove the retaining ring and gear (8).
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   Illustration 6	g00610372

9. Remove spacer (9) from each shaft.

10. Use the following procedure to disassemble the counterbalance valve.
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    Illustration 7	g00610399

    1. Use Tooling (A) to rotate the final drive and the travel motor, as shown.

    2. Remove bolts (10). Remove counterbalance valve (11).
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       Illustration 8	g00610408

    3. Remove springs (12) from the cover.

    4. Put an identification mark on timing plate (13) and the cover for assembly purposes. Remove timing plate (13) from the cover.

    5. Remove bearing (14) from the cover.
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       Illustration 9	g00610414

    6. Remove two dowels (15), if necessary.

    7. Remove valve (16) from the cover.
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       Illustration 10	g00610440
       (R) Steel Rod (S) Seal Pick

    8. Use a steel rod (R) of small diameter to push down on seat (18). Sustain pressure on the seat and remove retaining ring (17). Remove seat (18), spring (19), and valve (20) from the cover. Remove O-ring seal (21) from the seat.
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       Illustration 11	g00610450

    9. Remove two plugs (22), two springs (23) and two spring retainers (26) from the cover. Remove spool (24) from the cover. Remove O-ring seal (25) from each plug (22).
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       Illustration 12	g00610474

    10. Remove two plugs (27), two springs (28) and two valve (29) from the cover. Remove O-ring seal (30) from each plug (27).
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    Illustration 13	g00610489

11. Remove O-ring seals (31) and (33) from the spindle. Remove two dowels (32) from the spindle.
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    Personal injury or death can result from not following the proper procedures. To avoid the possibility of injury or death, follow the established procedure.

    Note: Piston (34) must be removed from the spindle by using shop air. The piston can come out of the spindle with force during the removal procedure. To prevent possible personal injury, install Tooling (C), as shown. Tooling (C) will retain the piston in the spindle, when shop air pressure is applied to port (X).

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    Illustration 14	g00610500

12. Install Tooling (C) on the spindle, as shown. Use suitable sized bolts and large, flat washers in order to hold Tooling (C) in place. Apply shop air at a pressure of 525 kPa (75 psi) to port (X). The piston will move out of the bore in the spindle. Remove Tooling (C) and piston (34) from the spindle.
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    Illustration 15	g00610519

13. Remove two backup rings (35) and (37) from piston (34). Remove two O-ring seals (36) and (38) from piston (34).
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    Illustration 16	g00610530

14. Use a seal pick to remove the friction plates and separator plates (39) from the spindle.
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    NOTICE
    In order to ensure that each piston assembly is installed into its original bore, identify and mark each piston assembly, retaining plate and the barrel before removing the piston assembly. To avoid damage to the barrel assembly parts, do not allow the parts to separate from the assembly during removal or installation.

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    Illustration 17	g00610539

15. Use Tooling (A) to rotate the final drive and the spindle. Carefully remove barrel assembly (40) from the shaft.

16. Use the following procedure to disassemble barrel assembly (40).
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    Illustration 18	g00610541

    1. Put identification marks on nine piston assemblies (41) in order to indicate the locations of the pistons in the retainer plate (42) and the barrel (40). Remove nine piston assemblies (41) and retainer plate (42) from barrel (40) as a unit. Separate the piston assemblies from the retainer plate.
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       Illustration 19	g00610552

    2. Remove guide (43) and spacer (44) from barrel (40). Remove the three pins from the barrel.
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       Illustration 20	g00610571

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       Illustration 21	g00610572

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       Sudden release of spring force can cause injury. To prevent the possibility of injury, follow the procedure to relieve the spring pressure.

       Note: There is spring force against washer (46). When retaining ring (45) is removed, the spring force will release. To prevent possible personal injury, removal of the internal components in barrel (40) must be performed in a press. The press will retain spring (47) and washer (48).

    3. Put barrel (40) in a press. Install a plate on washer (46). Use a plate that will provide clearance for the removal of retaining ring (45). Put slight compression on washer (46) with the press. Remove retaining ring (45). Slowly release the spring compression.

       Note: Washer (46) and washer (48) are identical and the washers are interchangeable.

    4. Remove washer (46), spring (47) and washer (48) from barrel (40).
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    Illustration 22	g00610629

17. Use Tooling (A) to rotate the final drive and the spindle, as shown. Remove swashplate (49) and shaft (50) as a unit. Use a soft faced hammer to tap the end of the shaft. Remove swashplate (49) from shaft (50).
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    Illustration 23	g00610653

18. Remove plate (51) from swashplate (49).
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    Illustration 24	g00610658

19. Use a press to remove bearing (52) from shaft (50).
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    Illustration 25	g00610663

20. Remove oil seal (54) from the spindle.

21. Remove pin (53) from the spindle.
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    Illustration 26	g00610683

    Note: Tooling (D) is used to hold the spindle and the final drive together as a unit.

22. Use suitable sized bolts, washers and nuts to install Tooling (D) over the spindle, as shown.
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    Illustration 27	g00610690

23. Use Tooling (A) to rotate the spindle and final drive, as shown.

24. Put identification marks on retaining rings (55), on plate (57) and on the three shafts. Identification marks are used to indicate the location of the parts. The plate and the retaining rings must be assembled in the original location in the housing and on the three shafts.
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    NOTICE
    The thread lock compound that is used on the reamer bolts may cause the reamer bolts to seize during removal. The reamer bolts should be slowly removed by hand. Do not use an impact wrench in order to remove the reamer bolts. If the reamer bolts will no longer turn during removal, do not force or complete the removal. Instead, tighten the bolts, then try to loosen them again.

25. Carefully remove three bolts (56).

26. Remove plate (57) from the spindle.
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    Illustration 28	g00610749

27. Remove three retaining rings (59) and three bearing races (58) from the plate.
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    Illustration 29	g00610754

28. Use a hammer and a punch to remove inner race (60) from the plate.
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    Illustration 30	g00610763

29. Remove balls (61) from the outer race.

30. Remove gear assembly (62) from the spindle. The gear assembly is removed by lifting straight up on two of the shafts.
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    Illustration 31	g00610782

31. Put identification marks on gear (65) and (66). Put identification marks on three shafts (64). Identification marks are used to identify the position in gear assembly (62).

32. Remove bearing (63) from the end of each shaft (64). Separate gear (65) from gear (66).

33. Remove the roller bearing from each shaft (64). Remove three shafts (64) from gear (66). Remove the remaining roller bearing and the bearing from each shaft (63).
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    Illustration 32	g00610809

34. Remove pins (67) from the final drive housing.
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    Illustration 33	g00610820

35. Rotate the housing, as shown. Remove Tooling (D). Fasten Tooling (E) to spindle (68).

36. Remove spindle (68) from housing (70). The weight of the spindle is approximately 25 kg (55 lb).

    Note: Balls (69) may fall out of the final drive housing when spindle (68) is removed.

37. Remove balls (69) from the outer race in housing (70).
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    Illustration 34	g00610828

38. Remove three outer races (71) from the spindle. Remove Duo-cone seal kit (73) from the spindle. Use a hammer and a punch to remove inner race (72) from the spindle.
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    Illustration 35	g00610838

39. Remove retainer (74) from the housing. Remove the O-ring seal that is located under retainer (74).

40. Use a hammer and a punch to remove outer races (75) and (76) from the housing.