315B Excavator Machine Systems Caterpillar

Assembly Procedure

Note: Inspect all parts. If any parts are worn or damaged use new parts for replacement. The installation of used parts during reconditioning is acceptable. Reuse and salvage information is available on piston pumps. Refer to Guideline For Reusable Parts and Salvage Operations, SEBF8032, "Piston Pumps and Motors". During reconditioning, correct any conditions that might have caused the original failure.

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.

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

Show/hide table



Illustration 1	g00731220

Show/hide table



Illustration 2	g00374861

2. Install seal (68) in the housing. Install Bearing (67) on shaft (66). Install shaft (66) in the main housing.

Note: Refer to Disassembly and Assembly, "Duo-Cone Conventional Seals - Install" in this manual.

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

Show/hide table



Illustration 3	g00374860

Show/hide table



Illustration 4	g00375013

3. Use Tooling (D) to install Dou-Cone seal (65) on main housing (64) .

Show/hide table



Illustration 5	g00374859
Typical example

4. Install bearing (62) on the ring gear.

Show/hide table



Illustration 6	g00375015

5. Use Tooling (D) to install Dou-Cone seal (63) on the ring gear.

Show/hide table



Illustration 7	g00374853

6. Install bearing (61) in the ring gear.

Show/hide table



Illustration 8	g00374856

Note: Do not damage Duo-Cone seals (63) during the assembly of the components. Do not scratch Duo-Cone seals (63) during the assembly of the components. After the installation of the ring gear on the main housing, there will be a small gap between the components. The gap is caused by the Duo-Cone seals. The gap will be eliminated during the installation of nut (60) .

7. Attach Tooling (C) to ring gear (44). Install ring gear (44) on the main housing.

8. Use the following procedure to make a preload adjustment of bearing (61) :
   Show/hide table
   
   

   Illustration 9	g00374411

   1. Use Tooling (E) to tighten a new nut (60) to 1245 ± 137 N·m (918 ± 101 lb ft). Rotate the hub while nut (60) is being tightened.
   Show/hide table
   
   

   Illustration 10	g00730220

   Note: The required rolling torque for the roller bearing is 21 ± 3 N·m (15.5 ± 2 lb ft).

   2. Measure the rotating torque of ring gear (44) .

   Note: The torque wrench must be perpendicular to the ring gear.

   Note: The required rolling torque for the roller bearing must be measured from the center of the hub. The torque wrench is not attached to the center of the hub. The torque wrench is attached to the ring gear at the radius of the bolt hole.

   3. The required torque value must be recalculated in order to compensate for any change in the length of the torque wrench. The length of the torque wrench and the remaining length to the center of the hub will determine the value of rolling torque. Calculate the torque by using the following formula: (21 ± 3 N·m) X (L / (L+R)). L = the length of the arm of the torque wrench. R = the distance between the center of the hub and the wheel stud.

   4. Use the torque wrench in order to slowly rotate the hub. Record the amount of torque that is required to rotate the hub. If the proper torque is not achieved, nut (60) must be readjusted until the proper torque of ring gear (44) is achieved.

Show/hide table



Illustration 11	g00374410

9. Install four set screws (59) .

Show/hide table



Illustration 12	g00374405

Show/hide table



Illustration 13	g00374402

10. Install spacer (58), bearing (57), and gear (56) .

11. Repeat Step 10 for the other three gear assemblies.

Show/hide table



Illustration 14	g00374401

12. Install four plates (55) .

13. Apply 9S-3263 Thread Lock Compound to four bolts (54). Tighten the four bolts to a torque of 59 ± 5 N·m (44 ± 4 lb ft).

Show/hide table



Illustration 15	g00376820

14. Install retaining ring (53) on sun gear (52) .

Show/hide table



Illustration 16	g00374398

15. Install sun gear (52) .

Show/hide table



Illustration 17	g00730222

16. Install washer (51), race (50), bearing (49) and gear (48) on carrier assembly (47) .

17. Install the other two planetary gears on carrier assembly (47) .

Show/hide table



Illustration 18	g00374358

18. Install carrier assembly (47) .

Show/hide table



Illustration 19	g00374336

19. Install sun gear (46) .

Show/hide table



Illustration 20	g00730037

20. Measure the distance from the surface of the housing to the surface of planetary gear (48) in carrier assembly (47). Record this dimension as dimension (X) .

21. If dimension (X) is between 6.22 mm (0.245 inch) and 6.91 mm (0.272 inch), then use 136-2843 Plate (45) .

22. If dimension (X) is between 5.49 mm (0.216 inch) and 6.20 mm (0.244 inch), then use 136-2842 Plate (45) .

23. If dimension (X) is between 4.79 mm (0.189 inch) and 5.47 mm (0.215 inch), then use 136-2841 Plate (45) .

Show/hide table



Illustration 21	g00374332

24. Install the appropriate plate (45) .

Show/hide table



Illustration 22	g00376813

25. Apply a bead of 1U-8846 Sealant around the machined surface of ring gear (44). Install cover (43) .

26. Install the washers and bolts (42) that hold the cover to ring gear (44). Tighten the bolts to a torque of 29 ± 2 N·m (21 ± 1 lb ft).

Show/hide table



Illustration 23	g00374252

27. Install two balls (40) and two pistons (41) according to the marked locations in the travel motor body.

Show/hide table



Illustration 24	g00374213

28. Install swashplate (39) in the travel motor body. Make sure that the machined notches in the swashplate engage the balls and the pistons.

Show/hide table



Illustration 25	g00374192

29. Install washer (38), spring (37) and washer (36) in barrel (31) .

Show/hide table



Illustration 26	g00730230

30. Use a press, and compress spring (37). Install retaining ring (35) .

Show/hide table



Illustration 27	g00374113

31. Install three pins (33) in the barrel.

32. Install bushing (32) on the barrel.

Show/hide table



Illustration 28	g00374112

33. Install piston shoe assemblies (30) in the original bores in shoe retainer (29) .

34. Put clean hydraulic oil in the bores of the barrel and on piston shoe assemblies (30). Install the piston shoe assemblies with the shoe retainer in the original bores in barrel (31) .

Show/hide table



Illustration 29	g00374063

35. Put clean hydraulic oil on the sliding surfaces of the swashplate, on the piston shoe assemblies and on the splined shaft of the motor. Put the travel motor body on one side and install barrel assembly (28) on the shaft as a unit.

Show/hide table



Illustration 30	g00730239

36. Put clean hydraulic oil on friction plate (25). Install friction plate (25), four O-rings (26) and seal (27) .

Show/hide table



Illustration 31	g00730242

37. Make sure that brake piston (20) is thoroughly clean and free of dirt and debris. Check the condition of backup rings (22) and (24) and O-ring seals (23) and (21). If the rings or the seals are worn or damaged, use new parts for replacement. Install backup ring (24), backup ring (22), O-ring seal (23), and O-ring seal (21) on brake piston (20), as shown. Put a coat of 1U-6396 O-Ring Assembly Compound on the backup rings and the O-ring seals.

Show/hide table



Illustration 32	g00731225

38. Put a thin coat of clean hydraulic oil on the surface of the travel motor body which makes contact with brake piston (20). Install the brake piston.

39. Install eight springs (34) .

40. Install port plate (20a) .

Show/hide table



Illustration 33	g00375025

41. If necessary, replace bearing (68) in head assembly (19) .

Show/hide table



Illustration 34	g00374059

42. Install retainer (16) and spring (17) on the travel brake valve. Install O-ring seal (18) on the cap.

Show/hide table



Illustration 35	g00374058

43. Install cap (15). Tighten four screws (14) to a torque of 59 ± 5 N·m (44 ± 4 lb ft).

Show/hide table



Illustration 36	g00374057

44. Install spool (13), retainer (12), spring (11) and O-ring (10) .

45. Install cap (9). Tighten four screws (8) to a torque of 59 ± 5 N·m (44 ± 4 lb ft).

Show/hide table



Illustration 37	g00374056

46. Install spring (5) and spool assembly (6) in the travel brake valve. Install two O-rings (4) and (7) on the two plugs (3) .

Show/hide table



Illustration 38	g00731872

47. Tighten two plugs (3) to a torque of 118 ± 6 N·m (87 ± 4 lb ft).

Show/hide table



Illustration 39	g00374052

48. Install travel brake valve (2) .

49. Install nine bolts (1) and tighten to a torque of 205 ± 10 N·m (152 ± 7 lb ft).

End By: Install the travel motor and the final drive. Refer to Disassembly and Assembly, "Travel Motor and Final Drive - Install" in this manual.