797 Off-Highway Truck Power Train Caterpillar

Disassembly Procedure

Start By:

1. Remove the Transmission Hydraulic Control. Refer to Disassembly and Assembly, "Transmision Hydraulic Control - Remove" for the machine that is being serviced.

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.

Show/hide table

Illustration 1	g00669984

1. Remove two bolts (1). Remove two retainers (2). Remove four sleeves (3) from manifold (4).
   Show/hide table

   Illustration 2	g00670009

2. Remove O-ring seals (5) from the sleeve.
   Show/hide table

   Illustration 3	g00675878

3. Remove four bolts (7) and the washers. Remove two drains (6).
   Show/hide table

   Illustration 4	g00675895

4. Remove six adapters (8), two adapters (9), two adapters (10) and the O-ring seals.
   Show/hide table

   Illustration 5	g00675912

5. Disconnect electrical connectors (11). Remove eight bolts (13) and the washers. Remove clips (12). Remove wiring harness (14).
   Show/hide table

   Illustration 6	g00676018

6. Remove twenty bolts (15) and the washers. Remove two modulating valves (16). Remove six bolts (17) and the washers. Remove five modulating valves (18).
   Show/hide table

   Illustration 7	g00682087

7. Remove two plates (19). Remove four plates (20).
   Show/hide table

   Illustration 8	g00682957

8. Remove six bolts (21). Remove two control valves (22). Remove sixteen bolts (24). Remove four control valves (23).
   Show/hide table

   Illustration 9	g00683484

9. Remove nut (25). Remove washer (26). Remove coil assembly (27).
   Show/hide table

   Illustration 10	g00683531

10. Remove cartridge (28).
    Show/hide table

    Illustration 11	g00683523

11. Remove back up ring (33) and O-ring seal (32). Remove back up ring (31) and O-ring seal (30). Remove O-ring seal (29).
    Show/hide table

    Illustration 12	g00683545

12. Remove eight bolts (34) and the washers. Remove relief valve (35).
    Show/hide table

    Illustration 13	g00683556

13. Remove fitting (36) and the O-ring seal from the relief valve.
    Show/hide table

    Illustration 14	g00683611

14. Remove O-ring seal (37) from the fitting.
    Show/hide table

    Illustration 15	g00683620

15. Remove plug (38) and the O-ring seal from the relief valve.
    Show/hide table

    Illustration 16	g00683645

16. Remove O-ring seal (39) from the plug.
    Show/hide table

    Illustration 17	g00683791

17. Remove slug (40) from the relief valve.
    Show/hide table

    Illustration 18	g00683922

18. Remove two bolts (41) and the washers. Remove adjustment cover (42).
    Show/hide table

    Illustration 19	g00683924

19. Remove O-ring seal (43) from the adjustment cover.
    Show/hide table

    Illustration 20	g00683925

20. Remove four bolts (44) and the washers. Remove cover (45) from the relief valve.
    Show/hide table

    Illustration 21	g00683926

21. Record the length of bolt (46) for installation purposes. Remove bolt (46) from the cover.
    Show/hide table

    Illustration 22	g00683927

22. Remove O-ring seal (47) from the relief valve.
    Show/hide table

    Illustration 23	g00683928

23. Remove stop (49) and spring (48) from the relief valve.
    Show/hide table

    Illustration 24	g00683930

24. Remove spool (50) from the relief valve.
    Show/hide table

    Possible injury can result when removing the retaining ring and spring. Spring force will be released when the retaining ring is removed. Be prepared to hold the cylinder assembly as the retaining ring is removed.

    Show/hide table

    Illustration 25	g00683932

25. Use Tooling (A) in order to remove retaining ring (51) from the spool.
    Show/hide table

    Illustration 26	g00683934

26. Remove retainer (54), spring (53), and ball (52) from the spool.
    Show/hide table

    Illustration 27	g00683935

27. Remove orifice plug (55) from the spool.
    Show/hide table

    Illustration 28	g00683936

28. Remove twelve bolts (56). Remove plate (57).
    Show/hide table

    Illustration 29	g00683937

29. Remove thirteen bolts (59). Remove plate (58). Remove two plugs (60) and the O-ring seals.
    Show/hide table

    Illustration 30	g00683938

30. Remove O-ring seal (61) from the plug.