325B Excavator Machine Systems Caterpillar

Assembly Procedure

Note: The following procedure is for the assembly of a swing motor that has a swing parking brake attachment.

1. Make sure that all of the parts of the swing motor are clean and free of dirt and debris prior to assembly. Check the condition of all the parts in the swing motor.

   Note: Refer to Guideline For Reusable Parts, SEBF8032, "Piston Pumps and Motors" as a guideline for reconditioning and determining the reusability of some parts.

2. Check the condition of all the O-ring seals and the backup rings that are used in the swing motor and the relief valves. If any of the O-ring seals are damaged, use new parts for replacement.

3. Use the following procedure to assemble the relief valves.
   Show/hide table

   Illustration 1	g00515704

   1. Install valve (57) in the body, as shown.
      Show/hide table

      Illustration 2	g00515702

   2. Install retainer (56) on the body, as shown.
      Show/hide table

      Illustration 3	g00515700

   3. Install spring (54) in body (55).
      Show/hide table

      Illustration 4	g00515699

   4. Install backup ring (52) and O-ring seal (53) on body (47). Make sure that the O-ring seal and the backup ring are in the correct positions, as shown.

   5. Install insert (51) and insert (50) in body (47), as shown.
      Show/hide table

      Illustration 5	g00515696

   6. Install ball (49) in the larger hole of the two holes in body (47).
      Show/hide table

      Illustration 6	g00515686

   7. Install retainer (48) on the body assembly, as shown.
      Show/hide table

      Illustration 7	g00515683

   8. Install body (47).
      Show/hide table

      Illustration 8	g00515681

   9. Install locknut (46) in body (47). Locknut (46) must be tightened to a torque of 160 ± 30 N·m (120 ± 22 lb ft) after adjustment of the valve is made.
      Show/hide table

      Illustration 9	g00515680

   10. Install seat (45), as shown.
       Show/hide table

       Illustration 10	g00515676

   11. Install spring (44).
       Show/hide table

       Illustration 11	g00517668

   12. Install O-ring seal (42) and backup ring (43) on plug (41), as shown.
       Show/hide table

       Illustration 12	g00517666

   13. Install plug (41) in relief valve (1). Plug (41) must be tightened to a torque of 120 ± 10 N·m (90 ± 7 lb ft).

   Note: Refer to Testing and Adjusting, SENR8961 for the correct procedure to adjust the pressure settings of each relief valve (1).

   Show/hide table

   Illustration 13	g00515633

4. Install one of the retaining rings (40) on the drive shaft.

5. Press the drive shaft into bearing (38) until the drive shaft contacts the retaining ring. Install the other retaining ring (40) on the other side of the bearing.

6. Install bearing race (39) and retaining ring (37) on the end of the drive shaft.
   Show/hide table

   Illustration 14	g00515627

   Show/hide table

   Illustration 15	g00515601

7. Install oil seal (36) in front cover (33) with Tool (A). Install the seal so the lip will be facing away from the outside of the front cover, and until the seal contacts the counterbore in the front cover.
   Show/hide table

   Illustration 16	g00518071

8. Install shaft assembly (32) in the body. Make sure that bearing (38) is seated in the counterbore in the body.

9. Lubricate the lip of oil seal (36) with clean hydraulic oil. Install front cover (33) over shaft assembly (32) and into the body with a soft faced hammer.
   Show/hide table

   Illustration 17	g00515596

10. Install retaining ring (31) that holds the shaft assembly in place. Install ring (35) on shaft assembly (32).
    Show/hide table

    Illustration 18	g00515595

11. Apply a thin coat of 5P-0960 Molybdenum Grease on the back side of plate (34). Install plate (34) in the body.

12. Install O-ring seals (29) and (30) in the body, as shown.

13. Use the following procedure to assemble the barrel assembly.
    Show/hide table

    Illustration 19	g00517704

    1. Install spacer (28), spring (27) and spacer (26) in barrel (22). Place the barrel in a press. Install a suitable size drive plate on spacer (26), and compress spring (27) until retaining ring (25) can be installed. Install retaining ring (25).
       Show/hide table

       Illustration 20	g00515587

    2. Install 12 pins (24) in barrel (22).
       Show/hide table

       Illustration 21	g00515539

    3. Install the spacer in bushing (23). Install bushing (23) on pins (24).
       Show/hide table

       Illustration 22	g00515535

    4. Apply clean hydraulic oil on nine piston assemblies (20). Install the piston assemblies in the piston assembly's original bores in plate (21). Install the plate with the piston assemblies in the original bores in barrel (22).
    Show/hide table

    Illustration 23	g00515533

    Note: Do not allow the barrel assembly to fall apart when the barrel assembly is installed in the body of the swing motor.

14. Place the swing motor on the swing motor's side. Install barrel assembly (18) in body (19).
    Show/hide table

    Illustration 24	g00515522

    Note: Make sure that the four tooth cut locations of each friction plate are in alignment. Also, the four tooth cut locations of each separator plate must be in alignment in the body of the swing motor.

15. Apply clean hydraulic oil on four separator plates and three friction plates (17). Install plates (17) in alternating order in body (19). Begin with a separator plate, and end with a separator plate.
    Show/hide table

    Illustration 25	g00515494

16. Install piston (16) in the body of the swing motor in the piston's original position. Threaded holes (X) can be used as a guide during installation. If the piston is difficult to install because of O-ring seal resistance, a soft faced hammer can be used as an aid in installation.
    Show/hide table

    Illustration 26	g00516977

17. Install 18 springs (14) in the piston.
    Show/hide table

    Illustration 27	g00517524

18. Install two pins (13) and bearing (12) in head (10).

19. Install O-ring seal (11) on head (10).
    Show/hide table

    Illustration 28	g00516981

20. Apply a thin coat of 5P-0960 Molybdenum Grease on the face of plate (15) that contacts the head. The grease will hold the plate to the head. Install the plate on the head in the plate's original position, as shown.
    Show/hide table

    Illustration 29	g00515433

21. Place head (10) in the head's original position on the body. Install four socket head bolts (9) that secure the head. Tighten the socket head bolts to a torque of 430 ± 43 N·m (315 ± 32 lb ft).
    Show/hide table

    Illustration 30	g00515430

    Show/hide table

    Illustration 31	g00515406

    Note: Be sure to install each makeup valve (4) in the makeup valve's original position in the head.

22. Install two makeup valves (4) in the head. Install O-ring seals (8) on plugs (5), springs (6) and plugs (7). Tighten plugs (7) to a torque of 220 ± 25 N·m (160 ± 18 lb ft).
    Show/hide table

    Illustration 32	g00515401

    Show/hide table

    Illustration 33	g00515399

    Note: Be sure to install each relief valve assembly (1) in the relief valve's original position in the head.

23. Install backup ring (2) and O-ring seal (3) on each relief valve assembly (1), as shown. Refer to Illustration 32.

24. Install relief valve assemblies (1) in the head. Tighten the relief valve assemblies to a torque of 180 ± 12 N·m (135 ± 9 lb ft).
    Show/hide table

    NOTICE
    To avoid system damage, make sure that the hydraulic motor is properly filled with hydraulic oil before start-up.

25. Fill the swing drive with oil to the correct level. Refer to Operation and Maintenance Manual, "Lubricant Viscosities" for the proper oil viscosity and Operation and Maintenance Manual, "Refill Capacities" for the correct amount. Refer to Operation and Maintenance Manual, "Swing Drive Oil Level - Check" for the proper filling procedure.

End By:

1. Install the swing motor. Refer to Disassembly and Assembly, "Swing Motor- Install" in this manual.