TK741, TK751 and TK752 Track Feller Bunchers Machine Systems Caterpillar

Disassembly Procedure

Start By:

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

1. Drain the oil from the final drive. Drain the oil into a suitable container for proper disposal.
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   Illustration 1	g00659659

2. Remove bolts (2) that mount travel motor (1).
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   Illustration 2	g00659674

3. Attach a suitable lifting device to travel motor (1). Remove travel motor (1). The weight of travel motor (1) is approximately 54 kg (120 lb).
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   Illustration 3	g00676009

4. Remove O-ring seal (3) from the travel motor.
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   Illustration 4	g01020262

5. Remove plug (4).
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   Illustration 5	g01020283

6. Fasten lifting straps and a suitable lifting device to the final drive sprocket. Remove the sprocket bolts (5) from final drive sprocket (6). Use a soft faced hammer to unseat the sprocket.

7. Remove final drive sprocket (6). The weight of final drive sprocket (6) is 91 kg (200 lb).
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   Illustration 6	g01020294

8. Remove bolts (7) and the washers that hold cover (8) in place.
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   Illustration 7	g01020301

9. Use forcing screws M12X50 mm (9) to elevate the cover. This will allow enough clearance for your fingers to lift the cover off the final drive.

10. Remove cover (8). The weight of cover 8 is approximately 39 kg (85 lb).

11. If necessary, remove the spacer (Not Shown) from cover (8).
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    Illustration 8	g00659771

12. Remove carrier assembly (10).

13. Disassemble carrier assembly (10), as follows:
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    Illustration 9	g00659793

    1. Use Tooling (B) to remove retaining ring (11).
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       Illustration 10	g00660636

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       Illustration 11	g01020401

    2. Use a soft faced hammer to remove planetary gear assembly (12). Tooling (E) may also be used to remove planetary gear assembly (12).

       Note: Rotate the planetary gear assembly so that the gear assembly comes off perpendicular to the carrier shaft.

    3. Disassemble planetary gear assembly (12), as follows.
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       Illustration 12	g00659802

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       Illustration 13	g00659805

    4. Use Tooling (C) to remove the second retaining ring (13).

       Note: When you remove the bearing assembly, the rollers will fall out of the bearing race. Put a rubber band around the bearing rollers as you remove the bearing assembly.

    5. Remove two rings (14), and bearing (15) from planetary gear assembly (12).

    6. Repeat Steps 13a through 13e for the other two planetary gears.
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       Illustration 14	g00659861

    7. Remove the center shaft (16) from carrier assembly (10).
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       Illustration 15	g00746486

    8. Use a hammer and a punch to remove washer (16a) from shaft (16).
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       Illustration 16	g00659844

    9. Use Tooling (D) to remove retaining ring (17).
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       Illustration 17	g00659863

    10. Remove sun gear (18) from carrier assembly (10).
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    Illustration 18	g00659867

14. Remove carrier assembly (19).

15. Disassemble carrier assembly (19), as follows:
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    Illustration 19	g00659873

    1. Use Tooling (D) to remove retaining ring (20).
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       Illustration 20	g00659879

    2. Use Tooling (E) to remove planetary gear assembly (21).
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       Illustration 21	g00659889

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       Illustration 22	g00903928

    3. Use Tooling (F) and a suitable press to drive the bearing assembly out of planetary gear (21).

       Note: This is only one method for removing the bearing. You may also cut the bearing. Cut a notch in the bearing cup. Refer to illustration 22. Remove one row of the bearing rollers through the notch. Make sure that you catch the rollers, while you drive the bearing assembly out of planetary gear (21).

    4. Repeat Steps 15a through 15c for the other two planetary gear assemblies.
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       Illustration 23	g00660095

    5. Use Tooling (D) to remove retaining ring (22).
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       Illustration 24	g00660100

    6. Remove sun gear (23) from carrier assembly (19).
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    Illustration 25	g00660105

16. Use Tooling (D) to remove retaining rings (26) from the planetary gear assemblies (24) and from carrier assembly (25).

    Note: There are two sets of bearing rollers for each planetary gear assembly. The bearing rollers for the lower bearing assembly will fall after the planetary gear assembly is removed.

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    Illustration 26	g01143474

17. Use Tooling (E) to remove planetary gear assemblies (24).

    Note: Two planetary gear assemblies (24) are removed to access the retaining ring that holds the carrier assembly (25) to the motor housing.

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    Illustration 27	g00660143

18. Use Tooling (G) to remove retaining ring (27).
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    Illustration 28	g00660173

19. Use Tooling (H) and a suitable lifting device to remove carrier assembly (25). The weight of carrier (25) is approximately 57 kg (125 lb).

20. Disassemble carrier assembly (25), as follows:
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    Illustration 29	g00765592

    1. Use Tooling (E) to remove bearing race (28) from the shafts of carrier assembly (25).

    2. Use Tooling (D) to remove retaining rings (26) from the remaining planetary gear assemblies.

    3. Use Tooling (E) to remove planetary gear assemblies from the carrier assembly.

    4. Use Tooling (E) to remove the other bearing races from the carrier assembly.

    5. Disassemble planetary gear assemblies (24), as follows.
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       Illustration 30	g00660181

    6. Remove bearing rollers (29), bearing races (28), two rings (30), and retaining ring (32) from planetary gear (31).

       Note: Place a rubber band around the bearing rollers as you remove the bearings.

21. Fasten a suitable lifting device to the final drive, and turn the final drive over 180 degrees.
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    Illustration 31	g00660205

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    Illustration 32	g00660210

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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.

22. Tighten Tooling (I) to relieve the spring pressure.

23. Use Tooling (J) to remove retaining ring (33).

24. Remove Tooling (I).
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    Illustration 33	g00660226

25. Remove plate (34).

26. Remove plug (35).
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    Illustration 34	g00660233

27. Remove springs (36).

    Note: There is an inner spring and an outer spring in each spring set.

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    Illustration 35	g00660240

28. Apply low air pressure through the port of plug (32). Hold a finger over the port directly across plug (32) while you inject the air. This will unseat the brake piston (37).

29. Remove brake piston (37).
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    Illustration 36	g00660245

30. Remove backup rings (38) and O-ring seal (39) from the piston.
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    Illustration 37	g00660451

31. Fasten a suitable lifting device to the final drive, and turn the final drive over 180 degrees in order for the discs and plates to fall out of the motor housing.

32. Remove the discs and plates (40) from the motor housing.

    Note: Note the orientation of the discs and the plates for installation purposes.

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    Illustration 38	g00660462

33. Use Tooling (K) to remove washer (41).
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    Illustration 39	g00744629

34. Use Tooling (J) to remove retaining ring (42).

    Note: Tap on plate (43) to relieve the pressure that is on retaining ring (42).

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    Illustration 40	g00660488

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    Illustration 41	g00660455

35. Fasten a suitable lifting device to the final drive, and turn the final drive over 180 degrees, as shown.

36. Use Tooling (I) to remove coupling shaft (45), bearing (44), and plate (43).
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    Illustration 42	g00660550

37. Disassemble coupling shaft (45), bearing (44), and plate (43), as follows.
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    Illustration 43	g00660508

    1. Use Tooling (F) and a suitable press to push the coupling shaft (45) through bearing (44) and plate (43).

       Note: Bearing (44) will stop once the bearing makes contact with the Plates (X).

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       Illustration 44	g00660671

       Note: Spread Plates (X) wide enough so that bearing (44) can be removed from plate (43).

    2. Use Tooling (F) and a suitable press to push bearing (44) out of plate (43).
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    Illustration 45	g06387895

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    Illustration 46	g06387826

    Note: Use caution not to damage the cage of the bearing cone underneath nut (46).

    Note: Use caution not to damage the threads on the spindle.

38. Drill four holes at Dimension (X). Holes at Dimension (X) should be 5 to 10 mm (0.20 to 0.39 inch) in diameter.

39. Use a suitable chisel to split nut (46) into two pieces at Dimension (X).

40. Remove nut (46) and all remaining contaminants.

41. Remove dowels (47).

127-8458 Final Drive Disassembly and Assembly Bench

Note: The following procedure is for using the final drive disassembly and assembly 127-8458 Bench .

Reference: Refer to the Tool Operating Manual for further procedures concerning 127-8458 Bench.

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Illustration 47	g00671089

1. Fasten Tooling (L) and a suitable lifting device to Tooling (M).

2. Lower Tooling (M) into the final drive. Make sure that the notches in nut (46) are aligned with the keys on Tooling (M). The weight of Tooling (M) is approximately 45 kg (100 lb).
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   Illustration 48	g00671092

3. Fasten Tooling (N) and a suitable lifting device to the final drive. Keep the hoist attached.

4. Position a fork lift under adapter ring (48).

5. Raise the final drive and adapter ring (48) simultaneously.
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   Illustration 49	g00671095

6. Raise the final drive and adapter ring (48) into the air so that you can bolt the final drive and adapter ring (48) together with bolts (49).

   Note: Place blocks under the adapter ring (48) while you tighten bolts (49).

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   Illustration 50	g00671100

7. Remove the suitable lifting device from Tooling (N) and attach four chains and a suitable lifting device to the upper half of Tooling (P).

8. Remove the upper half of Tooling (P). The weight of the upper half is approximately 816 kg (1800 lb).
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   Illustration 51	g00671109

9. Install Tooling (N) and place adapter ring (48) and the final drive onto the lower half of Tooling (P). The weight of the final drive, adapter ring (48), and Tooling (M) is approximately 522 kg (1150 lb).

10. Fasten the final drive onto the lower half of Tooling (P). Use eight 1 - 8THDX3.5 inch bolts (50) and eight 1 - 8THD nuts with washers.

11. Remove Tooling (N) and the suitable lifting device.
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    Illustration 52	g00671117

12. Place Tooling (Q) into the final drive.

13. Fasten a suitable lifting device to the upper half of Tooling (P) and install the upper half of Tooling (P) to the lower half of Tooling (P). Pin the two halves together.
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    Illustration 53	g00672359

14. Attach Tooling (R) to the pressure reducing valve manifold, as shown.

15. Set the torque level for the bench to 2000 psi (14500 lb ft). Do not exceed this pressure.

    Reference: Refer to the Tool Operating Manual, NEHS0673 for setting the torque level.

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    Illustration 54	g00671120
    (51) 128-4075 Shaft As

16. Place hex shaft (51) through the bench and into Tooling (Q).

17. Remove locknut (46). The breakaway torque will vary. The nut will loosen usually at 1400 psi (10750 lb ft).

18. Fasten a hoist to the upper half of Tooling (P).

19. Remove the upper half of Tooling (P).

Disassembly Procedure for the Main Housing and the Motor Housing

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Illustration 55	g00674023

1. Fasten Tooling (N) and a hoist to main housing (52), as shown.

2. Separate the main housing (52) from the motor housing (53). The weight of main housing (52) is approximately 204 kg (450 lb).

   Note: Two outer bearing cups and one roller bearing will be removed with the main housing. The other roller bearing and the two Duo-cone seal kits will remain with the motor housing.

3. Disassemble motor housing (53), as follows.
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   Illustration 56	g00674036

   1. Use two screwdrivers and remove bearing cone (54) from the motor housing.

   2. Remove Duo-cone seal gp (55) from the motor housing.
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      Illustration 57	g00674039

   3. Remove the backup rings and O-ring seal (56) from the motor housing.

   4. Remove the other Duo-cone seal gp (57) from the motor housing.

4. Disassemble the main housing (52), as follows.
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   Illustration 58	g00675939

   1. Remove bearing cone (58) from the main housing (52).
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      Illustration 59	g00675961

   2. Turn main housing (52) over 180 degrees, as shown.

   3. Remove bolts (59).

   4. Install Tooling (A) and a suitable lifting device to housing (61).

   5. Separate housing (61) from ring gear (60).
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      Illustration 60	g00676750

   6. Remove bearing cup (62) with a brass punch and a hammer.

   7. Rotate housing (61) over 180 degrees.
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      Illustration 61	g00676000

   8. Remove bearing cup (63) from housing (61).

   9. Remove O-ring seal (64) from housing (61).