375 & 375 L Excavators 1JM00001-UP (MACHINE) POWERED BY 3406 Engine(SEB...

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Product:  EXCAVATOR 
Model:  375-A L EXCAVATOR 1JM 
Configuration: 375 & 375 L Excavators 1JM00001-UP (MACHINE) POWERED BY 3406 Engine 

Disassembly and Assembly

SENR60270029

Final Drives
SMCS - 4050-010; 4050-017

Remove & Install Final Drives

Start By:

a. separate track assemblies

b. remove travel motors *

c. remove final drive sprockets *

*
The travel motor, and final drive sprocket do not have to be removed prior to removal or installation
of the final drive from the track roller frame. However, these components have to be removed to
disassemble the final drive.

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1. Install Tool (A) to the final drive as shown.

2. Fasten lifting straps and a hoist to Tool (A) and final drive (1) as shown.

NOTE: It may be necessary to adjust the lifting straps for correct balance of the final drive.

3. Remove 24 bolts (2) that hold the final drive to the track roller frame. Remove the final drive from
the track roller frame. The weight of the final drive is 953 kg (2100 lb).

NOTE: The following steps are for the installation of the final drive.

4. Make sure the mating surfaces of the final drive and track roller frame are clean and free of dirt and
debris.

5. Fasten lifting straps and a hoist to Tool (A) and the final drive as shown. Make sure the final drive
is level.

6. Put final drive (1) in position in the track roller frame.

7. Put 9S-3263 Thread Lock on the threads of 24 bolts (2) that hold the final drive to the track roller
frame. Install the 24 bolts, and tighten them evenly.

End By:

a. install final drive sprockets

b. install travel motors

c. connect track assemblies

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Disassemble & Assemble Final Drives

Start By:

a. remove final drives

1. Fasten the final drive to Tool (A). The weight of the final drive is 953 kg (2100 lb).

2. Fasten Tool (B) and a hoist to cover (2) as shown.

3. Remove 20 bolts (1) and the washers that hold cover (2) in position. Remove the cover. The weight
of the cover is 64 kg (140 lb).

NOTE: Shims (3) and spacer (4) may stay with cover (2) during its removal.

4. Remove shims (3) and spacer (4).

5. Fasten Tool (C) and a hoist to carrier assembly (5) as shown. Remove the carrier assembly. The
weight of carrier assembly (5) is 159 kg (350 lb).

6. Disassemble carrier assembly (5) as follows:

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a. Remove sun gear (6).

b. Remove spacer (7).

c. Drive spring pin (8) into planetary shaft (9) with a hammer and punch.

d. Remove planetary shaft (9), two thrust washers (10) and planetary gear (12) from the carrier.
Remove bearing (11) from planetary gear (12). Drive spring pin (8) out of planetary shaft (9) with a
hammer and punch.

e. Remove the other two planetary gears from the carrier as in Steps 6c and 6d.

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f. Remove retaining ring (13) and sun gear (14) from the carrier.

7. Remove spacer (15) from the carrier assembly.

8. Fasten Tool (B) and a hoist to ring gear (16) as shown. Remove ring gear (16). The weight of the
ring gear is 50 kg (110 lb).

9. Fasten Tool (B) and a hoist to carrier assembly (17) as shown. Remove the carrier assembly. The
weight of the carrier assembly is 154 kg (340 lb).

10. Disassemble carrier assembly (17) as follows:

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a. Drive spring pin (18) into planetary shaft (19) with a hammer and punch.

b. Remove planetary shaft (19), two thrust washers (20) and planetary gear (22) from the carrier.
Remove two bearings (21) from the planetary gear. Drive spring pin (18) out of planetary shaft (19)
with a hammer and punch.

c. Remove the other three planetary gears from the carrier as in Steps 10a and 10b.

11. Fasten Tool (B) and a hoist to ring gear (23) as shown. Remove the ring gear. The weight of the
ring gear is 125 kg (275 lb).

12. Remove O-ring seal (24) from the main housing.

13. Fasten Tool (B) and a hoist to carrier assembly (25) as shown. Remove the carrier assembly from
the gear. The weight of the carrier assembly is 34 kg (75 lb).

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14. Disassemble carrier assembly (25) as follows:

a. Drive spring pin (26) into planetary shaft (27) with a hammer and punch.

b. Remove planetary shaft (27), two thrust washers (28) and planetary gear (29) from the carrier.
Remove bearing (30) from the planetary gear.

c. Remove the other three planetary gears from the carrier as in Steps 14a and 14b.

15. Fasten Tooling (D) and a hoist to the main housing as shown. Remount the main housing to Tool
(A) as shown.

16. Remove 22 socket head bolts (31) that hold gear (32) to the main housing.

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17. Install two 10 × 1.5 mm forcing screws in gear (32). Tighten the forcing screws evenly to loosen
gear (32) from the dowel pins in the main housing.

18. Fasten Tool (B) and a hoist to gear (32) as shown. Remove the gear from the main housing. The
weight of the gear is 27 kg (60 lb).

19. If necessary, remove six dowel pins (35) from the main housing.

20. Remove shim (33) and bearing (34) from the main housing.

21. Using Tool (D) and a hoist, remove main housing (36) from the end housing. The weight of the
main housing is 245 kg (540 lb).

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22. Remove Duo-Cone seal (37) from the main housing.

23. Remove two races (38) from the main housing.

24. Remove the other part of Duo-Cone seal (37) from the end housing.

25. Remove bearing (39) from end housing (40).

NOTE: The following steps are for the assembly of the final drive.

26. Make sure all parts of the final drive are thoroughly clean and free of dirt and debris prior to
assembly. Check the condition of all O-ring seals used in the final drive. If any of the seals are worn
or damaged, use new parts for replacement. Reassemble the final drive on Tool (A).

27. Apply a thin coat of 5P-3931 High Temperature Anti-Seize Compound to the surface on end
housing (40) that makes contact with bearing (39). Install bearing (39) on the end housing as shown.
Make sure the bearing is in contact with the shoulder on the end housing.

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28. Apply a thin coat of 5P-3931 High Temperature Anti-Seize Compound to the surface on main
housing (36) that make contact with two races (38). Install two races (38) in the main housing as
shown. Make sure the races are in contact with the shoulders on the main housing.

29. Fasten Tool (D) and a hoist to the main housing as shown. Install the main housing on the end
housing.

30. Install bearing (34) in the main housing.

31. Adjust the bearing preload of the final drive. Determine the correct amount of shims (33) required
for the proper bearing preload as follows:

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Typical Example

a. Using a depth micrometer, measure the step height of gear (32) at several locations around the gear.
Find the average of the dimensions measured, and record it. Call it dimension (X).

b. Apply a load of 10000 kg (22000 lb) on bearing (34).

c. Turn main housing (36) several times to seat the bearings.

d. Reduce the load to 4500 ± 450 kg (9900 ± 990 lb).

Typical Example

e. With the load still on the bearings, measure the distance between the top face of the main housing
and the inner race of bearing (34). Do this in several locations around the main housing. Find the
average of the dimensions measured, and record it. Call it dimension (Y).

f. Determine the correct shim thickness to be used between the main housing and gear (32). The shim
thickness is equal to dimension (Y) - (X) ± 0.10 mm (.004 in).

32. Install shims (33) of the correct thickness, which was determined in Steps 31a through 31f, in the
main housing.

33. Apply a thin coat of 5P-3931 High Temperature Anti-Seize Compound to the six dowel pin
bores in the main housing. Reinstall six dowel pins (35) in the main housing.

34. Remove shims (33) from main housing (36).

35. Remove main housing (36) from end housing (40).

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NOTICE

See the topic "Assembly And Installation Of Conventional Duo-Cone

NOTE: The rubber seals and all surfaces that make contact with 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.

36. Using Tool (E), install Duo-Cone seal (37) in end housing (40) and in main housing (36).

37. Reinstall main housing (36) on end housing (40).

38. Reinstall shims (33) in the main housing.

39. Put gear (32) in its original position in the main housing.

40. Put 9S-3263 Thread Lock on the threads of 22 socket head bolts (31) that hold gear (32) in
position. Install the socket head bolts, and tighten them evenly to a torque of 1000 ± 125 N·m (740 ±
90 lb ft).

41. Assemble carrier assembly (25) as follows:

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a. Put clean SAE 30 oil on bearing (30). Install bearing (30) in planetary gear (29).

b. Put a thrust washer (28) on each side of planetary gear (29). Install the planetary gear and thrust
washers in the carrier.

c. Install planetary shaft (27) in the carrier and through the planetary gear. Make sure the spring pin
hole in the planetary shaft is in alignment with the spring pin hole in the carrier.

d. Install spring pin (26) in the carrier and into the planetary shaft. Install the spring pin until it is 2 to
3 mm (.078 to .118 in) below the outside surface of the carrier, and with the split in the spring pin
facing to either side of the carrier as shown in Illustration C28668P1. To prevent the spring pin from
falling out, make a stake mark on each side of the spring pin hole in the carrier. Each stake mark
should be approximately 1.5 mm (.06 in) from the outside diameter of the spring pin hole.

e. Install the other three planetary gears in the carrier as is Steps 41a through 41d.

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42. Fasten Tool (B) and a hoist to carrier assembly (25). Install the carrier assembly in the in the final
drive.

43. Install O-ring seal (24) on the main housing as shown.

44. Put 1U-8846 Gasket Maker on the mating surfaces of ring gear (23) and the main housing.
Fasten Tool (B) and a hoist to ring gear (23). Put the ring gear in its original position on the main
housing.

45. Assemble carrier assembly (17) as follows:

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a. Put clean SAE 30 oil on bearings (21). Install bearings (21) in planetary gear (22).

b. Put a thrust washer (20) on each side of planetary gear (22). Install the planetary gear and thrust
washers in the carrier.

c. Install planetary shaft (19) in the carrier and through the planetary gear. Make sure the spring pin
hole in the planetary shaft is in alignment with the spring pin hole in the carrier.

d. Install spring pin (18) in the carrier and into the planetary shaft. Install the spring pin until it is 2 to
3 mm (.078 to .118 in) below the outside surface of the carrier, and with the split in the spring pin
facing to either side of the carrier as shown in Illustration C28668P1. To prevent the spring pin from
falling out, make a stake mark on each side of the spring pin hole in the carrier. Each stake mark
should be approximately 1.5 mm (.06 in) from the outside diameter of the spring pin hole.

e. Install the other three planetary gears in the carrier as is Steps 45a through 45d.

46. Fasten Tool (B) and a hoist to carrier assembly (17) as shown. Install the carrier assembly in ring
gear (23).

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47. Put 1U-8846 Gasket Maker on the mating surfaces of ring gear (16). Fasten Tool (B) and a hoist
to ring gear (16). Put the ring gear in its original position on ring gear (23).

48. Install spacer (15) in carrier assembly (17).

49. Assemble carrier assembly (5) as follows:

a. Install sun gear (14) and retaining ring (13) in the carrier.

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b. Put clean SAE 30 oil on bearing (11). Install bearing (11) in planetary gear (12).

c. Put a thrust washer (10) on each side of planetary gear (12). Install the planetary gear and thrust
washers in the carrier.

d. Install planetary shaft (9) in the carrier and through the planetary gear. Make sure the spring pin
hole in the planetary shaft is in alignment with the spring pin hole in the carrier.

e. Install spring pin (8) in the carrier and into the planetary shaft. Install the spring pin until it is 2 to 3
mm (.078 to .118 in) below the outside surface of the carrier, and with the split in the spring pin
facing to either side of the carrier as shown in Illustration C28668P1. To prevent the spring pin from
falling out, make a stake mark on each side of the spring pin hole in the carrier. Each stake mark
should be approximately 1.5 mm (.06 in) from the outside diameter of the spring pin hole.

f. Install the other two planetary gears in the carrier as is Steps 49b through 49e.

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g. Install spacer (7) in the carrier.

h. Install sun gear (6) in the carrier.

50. Fasten Tool (C) to carrier assembly (5) as shown. Put the carrier assembly in position in the final
drive.

51. Use the procedure which follows to determine the end play of sun gear (6):

NOTE: The end play of sun gear (6) is controlled by the addition of shims (3) used between cover (2)
and spacer (4).

Typical Example

a. Install spacer (4) in cover (2) without shims.

b. Use a straight edge and a depth micrometer to measure the distance from the machined surface of
cover (2) to the top of spacer (4). Record this dimension. Subtract the thickness of the straight edge
from the distance measured, and call the difference dimension (Q).

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Typical Example

c. Use a straight edge and a depth micrometer to measure the distance from the upper surface of sun
gear (6) to the machined surface of ring gear (16). It will be necessary to use a spacer block on top of
the sun gear so the straight edge will clear the carrier assembly. Record this dimension. Subtract the
thickness of the straight edge and the spacer block from the distance measured, and call the difference
dimension (P).

d. Subtract dimension (P) from dimension (Q). Record this dimension. The clearance required
between the top surface of sun gear (6) to the top of spacer (4) must be 1.00 to 2.60 mm (.039 to .102
in). Add shims (3) between spacer (4) and cover (2) to obtain the correct clearance.

52. Remove spacer (4) from cover (2).

53. Put 1U-8846 Gasket Maker on the mating surfaces of ring gear (16) and cover (2).

54. Install shims (3) determined in Steps 51a through 51d and spacer (4) in cover (2). Use 5P-0960
Multipurpose Grease to hold the shims and spacer in the cover.

55. Fasten Tool (B) and a hoist to cover (2) as shown. Put the cover in its original position on the final
drive.

56. Put 9S-3263 Thread Lock on the threads of 20 bolts (1). Install 20 bolts (1) that hold cover (2) in
position. Tighten the bolts to a torque of 1800 ± 200 N·m (1320 ± 150 lb ft).

End By:

a. install final drives

Copyright 1993 - 2023 Caterpillar Inc. Tue Jul 18 21:46:11 CDT 2023 
All Rights Reserved.

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