320D2 GC Excavator Machine Systems Final Drive - Assemble Caterpillar


Final Drive - Assemble
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1.1. Assembly Procedure

Assembly Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
1P-2420  Transmission Repair Stand 
439-3938  Link Bracket 
439-3940  Link Bracket 
126-3994  Duo-Cone Seal Installer 
Loctite C5-A Anti-Seize Lubricant   
Loctite High Flex From-In-Place Gasket   

    Note: Cleanliness is an important factor. Before assembly, all parts should be cleaned in cleaning fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts. Lint may be deposited on the parts which may cause later trouble. Inspect all parts. If any parts are worn or damaged, use new parts for replacement. All disassembly and all assembly procedures must be performed on a clean work surface and in a clean hydraulic area. Keep cleaned parts covered and protected at all times.

    Note: O-rings, gaskets, and seals should always be replaced. A used O-ring may not have the same sealing properties as a new O-ring. Use 1U-6396 O-Ring Assembly Compound during the assembly procedure.

    Note: Apply a light film of hydraulic oil to all components before assembly.

  1. Install the final drive sprocket if the sprocket was removed from the main housing.

  2. Refer to Disassembly and Assembly, "Final Drive Sprocket - Remove and Install".


    Illustration 1g00708215

  3. Apply Tooling (H) to the outer diameter of the bearings.

  4. Install bearings (32) and (33) in main housing (18) with a suitable press.

  5. Make sure that bearing (32) and bearing (33) contact the counter bore in the main housing.

  6. Use the following procedure to preload the bearings and determine the correct thickness of shims.


      Illustration 2g00713058

    1. Fasten Tooling (D) and a suitable lifting device to main housing (18). Install the main housing on the motor housing.

    2. Put the main housing and the motor housing in a suitable press.


      Illustration 3g00709278
      (a) Bearing surface
      (b) Housing surface

    3. Use a suitable press and a spacer in order to apply a load of 4000 kg (8819 lb) on the bearings. Rotate the housing in order to seat the bearings.

    4. Reduce the load on the bearings to 1000 ± 100 kg (2205 ± 221 lb).

    5. Use a depth micrometer in order to measure the step length between the bearing surface and the housing surface. Take measurements at several different locations around the housing. Compute the average of the measured dimensions and record the number. Call this Dimension (Y).


      Illustration 4g00709276

    6. Use a depth micrometer in order to measure the step length of gear (26). Take measurements at several different locations around the gear. Compute the average of the measured dimensions and record the number. Call this Dimension (X).

    7. The thickness of the shims is equal to (X − Y) ± 0.05 mm (0.002 inch).

      Note: Use no more than two shims. If two shims are required, install the thinner shim next to the gear.

    8. Remove the main housing from the motor housing.


    Illustration 5g01021370

  7. Use Tooling (G) in order to install Duo-Cone seal (31) in main housing (18). Refer to Disassembly and Assembly, "Duo-Cone Conventional Seals - Install".

    Note: The rubber seals and all surfaces that contact the seals must be clean and dry. After installation of the seals, put clean SAE 30 oil on the contact surfaces of the metal seals.



    Illustration 6g01021371

  8. Use Tooling (G) in order to install Duo-Cone seal (29) in motor housing (28).


    Illustration 7g00708214

  9. Apply Tooling (H) to the surfaces that contact pins (30).

  10. Install alignment pins (30).

    Note: Do not damage the Duo-Cone seals in the main housing or in the motor housing during the assembly of the two components. After installation of the main housing on the motor housing, there will be a small gap between the components. The gap is caused by the Duo-Cone seals. This gap will be eliminated during installation of gear (26).



    Illustration 8g00713058

  11. Fasten Tooling (D) and a suitable lifting device to main housing (18). Install the main housing on the motor housing.


    Illustration 9g00708211

  12. Install shims (27) that were determined in Step 6.g in the main housing.

    Note: If two shims are required, install the thinner shim next to the gear.



    Illustration 10g00708187

  13. Install gear (26).

  14. Install bolts (25) in gear (26). Install the bolts in an even pattern until the gear is seated against the bearing. Tighten bolts (25) in a crisscross pattern.


    Illustration 11g00708186

  15. Install O-ring seal (24) to main housing (18).


    Illustration 12g00708175

  16. Assemble carrier assembly (15), as follows.


      Illustration 13g00708220

    1. Install bearings (22) in planetary gear (23).

    2. Install thrust washers (21) and planetary gear (23) in the carrier assembly.

    3. Use a deburring tool in order to remove the metal burr from the openings in the carrier. Install planetary shaft (19) in the carrier assembly.

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


      Illustration 14g00513451

    5. Orient the split in spring pin (20) vertically to the carrier. Align the split in the spring pin to the top or to the bottom. Make a stake mark on each side of the spring pin hole in the carrier. Each stake mark should be approximately 1.50 mm (0.059 inch) from the outside diameter of the spring pin hole.

  17. Repeat Steps 16.a through 16.e in order to install the remaining planetary gears in the carrier assembly.


    Illustration 15g00708172

  18. Install a lifting sling through the middle of carrier assembly (15). Fasten a 12.7 mm (0.50 inch) shackle to the suitable lifting device.

  19. Install carrier assembly (15) on the final drive. The weight of carrier assembly (15) is approximately 39 kg (85 lb).

  20. Remove the shackle and the suitable lifting device.


    Illustration 16g00713148

  21. Apply Tooling (F) to the mating surface of ring gear (17b).

  22. Install ring gear (17a) on ring gear (17b).


    Illustration 17g00708184

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


    Illustration 18g00708325

  24. Install spacer (16) in the carrier assembly.


    Illustration 19g00708162

  25. Install sun gear (14) in carrier assembly (15).


    Illustration 20g01304883


    Illustration 21g00708218

  26. Assemble carrier assembly (7), as follows.

    1. Install bearing (12) in planetary gear (13).

    2. Install thrust washers (11) and planetary gear (13) in the carrier assembly.

    3. Install planetary shaft (9) in the carrier assembly.

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


      Illustration 22g00513451

    5. Orient the split in spring pin (10) vertically to the carrier. Align the split in the spring pin to the top or to the bottom. Make a stake mark on each side of the spring pin hole in the carrier. Each stake mark should be approximately 1.50 mm (0.059 inch) from the outside diameter of the spring pin hole.

  27. Repeat Steps 26.a through 26.e in order to install the remaining planetary gears in the carrier assembly.


    Illustration 23g00708092

  28. Install carrier assembly (7) in the ring gear. The weight of carrier assembly (7) is approximately 14 kg (30 lb).

  29. Install sun gear (8) in carrier assembly (7).

  30. Install spacer (6) in carrier assembly (7).


    Illustration 24g00708235

  31. Install new O-ring seals (5) on plugs (4) that were in the cover.


    Illustration 25g00708091

  32. Install plugs (4) in cover (2). Tighten plugs (4) to a torque of 80 ± 10 N·m (59 ± 7 lb ft).

  33. Install thrust plate (3) in cover (2).

  34. Apply Tooling (F) to the mating surface of the ring gear.


    Illustration 26g00708090

  35. Fasten Tooling (B) and a suitable lifting device to cover (2), as shown. The weight of cover (2) is approximately 32 kg (70 lb). Install cover (2).

  36. Remove Tooling (B) and install the setscrews in cover (2).


    Illustration 27g00708089

  37. Install bolts (1) and the washers that hold the cover in position. Tighten bolts (1) in a crisscross pattern.

  38. Remove the final drive from Tooling (A). The combined weight of the final drive and final drive sprocket is approximately 310 kg (683 lb).

End By:

  1. Install the final drive.

Information System:

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