320D2 GC Excavator Machine Systems Final Drive - Disassemble Caterpillar


Final Drive - Disassemble
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1.1. Disassembly Procedure

Disassembly Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
1P-2420  Transmission Repair Stand 
439-3938  Link Bracket 
154-6181  Forcing Bolt 
439-3940  Link Bracket 
5F-7366  Forcing Bolt 
1P-5546 Crossblock 
1U-9889 Crossblock 
1P-0520 Driver Group 
6V-7888 Puller Leg 
1H-3112 Puller Assembly 
1P-5551 Adjustable Screw Assembly 
Loctite 5127 

Start By:

  1. Remove the final drive.

    Note: Cleanliness is an important factor. Before the disassembly procedure, thoroughly clean the exterior of the component. This action will prevent dirt from entering the internal mechanism.

  1. Put an alignment mark across the sections of the final drive for assembly purposes. The parts must be reinstalled in the original locations.


    Illustration 1g00708089

  2. Fasten the final drive to Tooling (A), as shown. The combined weight of the final drive and final drive sprocket is approximately 312 kg (688 lb).

  3. Remove bolts (1) and the washers that hold the cover in position.


    Illustration 2g00708090

  4. Remove the setscrews from cover (2), and fasten Tooling (B) and a suitable lifting device to cover (2), as shown. The weight of cover (2) is approximately 32 kg (70 lb). Remove cover (2).


    Illustration 3g00708091

  5. Remove thrust plate (3) from cover (2).

  6. Remove plugs (4) from cover (2).


    Illustration 4g00708235

  7. Remove O-ring seals (5) from both plugs (4) that were in the cover.


    Illustration 5g00708092

  8. Remove spacer (6) from carrier assembly (7).

  9. Remove sun gear (8) from carrier assembly (7).

  10. Remove carrier assembly (7) by lifting the carrier assembly straight up. The weight of carrier assembly (7) is approximately 14 kg (30 lb).


    Illustration 6g01304883

  11. Disassemble carrier assembly (7), as follows.

    1. Drive spring pin (10) into planetary shaft (9) with a hammer and a punch.


      Illustration 7g00708144

    2. Remove planetary shaft (9) with spring pin (10) from the carrier assembly.

    3. Remove spring pin (10) from planetary shaft (9) with a hammer and a punch.


      Illustration 8g00708218

    4. Remove thrust washers (11) and planetary gear (13) from the carrier assembly.

    5. Remove bearing (12) from planetary gear (13).

  12. Repeat Steps 11.a through 11.e in order to remove the remaining planetary gears from the carrier assembly.


    Illustration 9g00708162

  13. Remove sun gear (14) from carrier assembly (15).


    Illustration 10g00708325

  14. Remove spacer (16).


    Illustration 11g00708184

    Note: It will be necessary to pry ring gears (17) away from main housing (18) in order to install the lifting slings.

  15. Fasten a suitable lifting device to ring gears (17), as shown. Remove the ring gears from main housing (18). The weight of ring gears (17) is approximately 45 kg (100 lb).


    Illustration 12g00708360

  16. Use a screwdriver or a chisel in order to separate two ring gears (17).

    Note: Two ring gears (17) are held together with Tooling (F). It may be necessary to heat ring gears (17) in order to soften the sealant. Do not heat over 135 °C (275 °F) for more than thirty minutes.



    Illustration 13g00708172

  17. Position a 12.7 mm (0.50 inch) shackle under carrier assembly (15).

  18. Fasten a suitable lifting device to the shackle.

  19. Slowly lift carrier assembly (15) from the final drive. The weight of carrier assembly (15) is approximately 39 kg (85 lb).

  20. Disassemble carrier assembly (15), as follows.


      Illustration 14g00708175

    1. Drive spring pin (20) into planetary shaft (19) with a hammer and a punch.


      Illustration 15g00708370


      Illustration 16g00708220

    2. Remove planetary shaft (19) with spring pin (20) from the carrier assembly.

    3. Remove spring pin (20) from planetary shaft (19) with a hammer and a punch.

    4. Remove thrust washers (21) and planetary gear (23) from the carrier assembly.

    5. Remove bearings (22) from planetary gear (23).

  21. Repeat Steps 20.a through 20.e in order to remove the remaining planetary gears from the carrier.


    Illustration 17g00708186

  22. Remove O-ring seal (24) from main housing (18).


    Illustration 18g00708187

  23. Remove bolts (25) from gear (26).


    Illustration 19g00708202

  24. Use Tooling (C) in order to remove gear (26) from main housing (18).

    Note: The motor housing will separate from main housing (18) once gear (26) is removed. Make sure that the motor housing is supported.



    Illustration 20g00708211

  25. Remove shims (27) from the main housing.


    Illustration 21g00708212

  26. Fasten Tooling (D) and a suitable lifting device to main housing (18), as shown.

  27. Use a hammer and a punch in order to separate main housing (18) and the final drive sprocket from motor housing (28). The combined weight of main housing (18) and the final drive sprocket is approximately 82 kg (180 lb).


    Illustration 22g00708214

  28. Remove Duo-Cone seal (29) from motor housing (28).

  29. Remove alignment pins (30).


    Illustration 23g00708215


    Illustration 24g00708216

  30. Remove Duo-Cone seal (31) from main housing (18).

  31. Use Tooling (E) in order to remove bearings (32) and (33) from the main housing.

  32. If necessary, remove the final drive sprocket from the main housing.

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