The document provides disassembly and assembly instructions for the travel motor of an M312 excavator. It lists 44 steps to disassemble the travel motor and its components. These include removing covers, gaskets, seals, valves, springs, pins, and other parts. It then lists the assembly steps in reverse order, noting to replace all seals and gaskets, apply oil, and ensure cleanliness during assembly.
2. Shutdown SIS
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Product: EXCAVATOR
Model: M312 EXCAVATOR 6TL
Configuration: M312 Excavator 6TL00410-UP (MACHINE) POWERED BY 3054 Engine
Disassembly and Assembly
M312 and M315 Excavators Power Train Supplement
Media Number -RENR4026-00 Publication Date -01/12/2000 Date Updated -09/10/2001
i01354524
Travel Motor - Disassemble
SMCS - 4351-015
S/N - 6TL1140-UP
S/N - 7ML1917-UP
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
(A) 1U-7563 Hex Wrench 1
(B) 1U-7600 Slide Hammer Puller Gp 1
(C) 6V-3821 Bolt 1
(D) 8H-0663 Bearing Puller 1
Start By:
A. Remove the travel motor. Refer to Disassembly and Assembly, "Travel Motor - Remove" in
this manual.
NOTICE
Care must be taken to ensure that fluids are contained during
performance of inspection, maintenance, testing, adjusting and repair
of the product. Be prepared to collect the fluid with suitable containers
before opening any compartment or disassembling any component
containing fluids.
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3. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop
Products Guide" for tools and supplies suitable to collect and contain
fluids on Caterpillar products.
Dispose of all fluids according to local regulations and mandates.
Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the
component should be thoroughly cleaned. This will help to prevent dirt from entering the internal
mechanism.
Illustration 1 g00715031
1. Remove two drain plugs (2) from housing (1). Drain the oil from the travel motor into a
suitable container for storage or disposal.
Illustration 2 g00715021
2. Mark brake valve (3) for reassembly purposes. Remove socket head bolts (4), bolts (5),
covers (6) and gaskets (7) .
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4. Illustration 3 g00715053
3. Remove two socket head bolts (8). Remove brake valve (3) .
Illustration 4 g00715270
4. Remove two large O-ring seals (9) and two small O-ring seals (10) .
Illustration 5 g00715056
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5. 5. Remove four bolts (11). Remove cover (12) .
Illustration 6 g00715065
6. Remove O-ring seal (13) .
Illustration 7 g00715098
7. Remove piston assembly (14) from the brake valve.
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6. Illustration 8 g00715103
8. Remove screw plug (15), pin (16) and retainer (17) from spool (18). Remove screw (23),
spring retainers (21), spring (22), pin (20) and retainer (19) from spool (18) .
Illustration 9 g00715208
9. Remove four socket head bolts (24). Remove cover (25) .
Illustration 10 g00715214
10. Remove O-ring seal (26) .
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7. Illustration 11 g00715318
11. Remove valve (27), O-ring seal (28), spring (29) and plunger (30). Remove lock (31),
spring (32) and plunger (33) .
12. Repeat Step 11 on the other side.
Illustration 12 g00715335
13. Remove plug (34) and the O-ring seal. Plug (35) and the O-ring seal. Plug (36) and the O-
ring seal.
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8. Illustration 13 g00715343
14. Use Tooling (A) in order to remove valve (37) .
Illustration 14 g00715351
15. Remove plug (38) and the O-ring seal.
Illustration 15 g00715362
16. Remove eight bolts (39). Remove O-ring seal (40) .
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9. Illustration 16 g00715373
17. Remove port plate (41) .
Illustration 17 g00715385
18. Remove the plastic caps. Remove valve assemblies (42). Mark the two covers for
reassembly purposes.
Illustration 18 g00715795
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10. 19. Remove three O-ring seals (43) from both valves.
Illustration 19 g00716288
20. Remove plugs (43) and the O-ring seals.
Illustration 20 g00716310
21. Remove bolts (44) and cover (45) .
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11. Illustration 21 g00716320
22. Remove large O-ring seal (46). Remove plug (47) and the O-ring seal.
Personal injury can result from parts and/or covers under spring
pressure.
Spring force will be released when covers are removed.
Be prepared to hold spring loaded covers as the bolts are loosened.
Illustration 22 g00716327
Note: Cover (49) is under spring pressure.
23. Carefully remove bolts (48) and cover (49). Remove plastic cap (50) .
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12. Illustration 23 g00716401
24. Remove spring (51) and bushing (52) .
Illustration 24 g00716407
25. Remove four small O-ring seals (53) and one large O-ring seal (54) .
Illustration 25 g00716413
26. Remove retaining ring (55) and valve assembly (56) .
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13. Illustration 26 g00716533
27. Remove clip (57). Remove stem (58) from spool (59) .
Illustration 27 g00716419
28. Remove plug (60) and the O-ring seal.
Illustration 28 g00716428
Note: Record distance (X) from the locknut to the end of the screw for installation purposes.
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14. Illustration 29 g00716436
29. Remove screw (61) and dowel (62) .
Illustration 30 g00716440
30. Remove spring (63) and cap (64) .
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15. Illustration 31 g00716557
31. Remove screw (65) in order to remove the piston.
Illustration 32 g00716567
32. Install Tooling (C). Remove seal (66) .
Illustration 33 g00716576
33. Remove plastic caps (67) .
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16. Illustration 34 g00716586
Note: Record the distance from the locknut to the end of the set screw for installation
purposes.
34. Remove locknuts (68) and screws (69) .
Illustration 35 g00716593
35. Use the appropriate retaining ring pliers to remove retaining ring (70) .
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17. Illustration 36 g00716597
36. Remove shim (71) .
Illustration 37 g00716600
37. Use Tooling (B) in order to remove seal (72) .
Illustration 38 g00716601
38. Use a suitable press in order to remove rotator assembly (73) .
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18. Illustration 39 g00716605
39. Remove Tooling (C) from barrel (74) .
Illustration 40 g00716607
40. Remove screws (75) from retainer (76). Remove pistons (77) and center pin (78) .
Illustration 41 g00716610
41. Remove spring (79) and shim (80) .
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19. Illustration 42 g00716621
42. Remove rings (81) .
Illustration 43 g00716696
43. Remove retaining ring (82) and shim (83) .
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20. Illustration 44 g00716623
44. Place the rotor assembly in a suitable press. Use Tooling (D) in order to press shaft (84)
from bearing (85), shim (86) and bearing (87) .
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Tue Jun 2 11:25:36 UTC+0800 2020
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21. Shutdown SIS
Previous Screen
Product: EXCAVATOR
Model: M312 EXCAVATOR 6TL
Configuration: M312 Excavator 6TL00410-UP (MACHINE) POWERED BY 3054 Engine
Disassembly and Assembly
M312 and M315 Excavators Power Train Supplement
Media Number -RENR4026-00 Publication Date -01/12/2000 Date Updated -09/10/2001
i01358326
Travel Motor - Assemble
SMCS - 4351-016
S/N - 6TL1140-UP
S/N - 7ML1917-UP
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
(A) 1U-7563 Hex Wrench 1
(C) 6V-3821 Bolt 1
(E) 149-4935 Measuring Tool 1
(F) 1P-0510 Driver Group 1
Note: Replace all O-ring seals and gaskets. Apply a light film of hydraulic oil to all components
before assembly.
Note: Cleanliness is an important factor. Before assembly, all parts should be thoroughly 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.
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22. Illustration 1 g00717509
1. Install screw (65) in order to secure the piston.
Illustration 2 g00717517
2. Install spring (63) and cap (64) .
Illustration 3 g00716428
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23. Note: Use recorded distance (X) from the locknut to the end of the screw for installation
purposes.
Illustration 4 g00716436
3. Install screw (61) and dowel (62) .
Illustration 5 g00716419
4. Install plug (60) and the new O-ring seal.
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25. Illustration 6 g00716533
5. Install stem (58) into spool (59). Install clip (57).
Illustration 7 g00716413
6. Install valve assembly (56) and retaining ring (55) .
Illustration 8 g00716407
7. Install four new small O-ring seals (53) and one new large O-ring seal (54) .
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26. Illustration 9 g00716401
8. Install spring (51) and bushing (52) .
Illustration 10 g00716327
9. Install cover (49) and bolts (48). Tighten the bolts to a torque of 35 N·m (26 lb ft). Install
plastic cap (50) .
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27. Illustration 11 g00716320
10. Install new large O-ring seal (46). Install plug (47) and the new O-ring seal.
Illustration 12 g00716310
11. Install cover (45) and bolts (44). Tighten the bolts to a torque of 120 N·m (88 lb ft).
Illustration 13 g00716288
12. Install plugs (43) and the new O-ring seals.
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