784C and 785C Off-Highway Trucks Machine Systems Caterpillar

Disassembly Procedure

Start By:

1. Remove the gear pump (torque converter and parking brake release). Refer to Disassembly and Assembly, "Gear Pump (Torque Converter and Parking Brake Release) - Remove".

Note: Cleanliness is an important factor. Before the disassembly procedure, thoroughly clean the exterior of the component. This helps to prevent dirt from entering the internal mechanism.

Show/hide table

Illustration 1	g00564549

1. Position gear pump (1) onto a suitable work bench.

2. Mark the four sections of gear pump (1) for assembly purposes.

3. Remove bolts (2) in order to remove plate (3) and the O-ring seal from oil pump cover (4).
   Show/hide table

   Illustration 2	g00564550

4. Remove bolts (6) and the hard washers. Remove bolts (8) and the hard washers in order to remove pump cover (7) and the O-ring seal from oil pump body (5).
   Show/hide table

   Illustration 3	g00564551

5. Use Tooling (A) and a suitable press to remove bearings (9) from pump cover (7).
   Show/hide table

   Illustration 4	g00564552

6. Remove gear (13) from pump gear assembly (11).

7. Remove gear (13) from gear assembly (10). Remove woodruff key (12) (not shown) from gear assembly (10).
   Show/hide table

   Illustration 5	g00564574

8. Remove pump body (5) and the O-ring seal from pump body (15).

9. Remove dowels (14) from pump body (5).
   Show/hide table

   Illustration 6	g00564575

10. Remove pump cover (4) and the O-ring seal from pump body (16).
    Show/hide table

    Illustration 7	g02694177

11. Use Tooling (A) and a suitable press to remove bearings (17) from pump cover (4).
    Show/hide table

    Illustration 8	g02694257

12. Remove pump body (16) and the O-ring seal from pump body (15).

13. Remove dowels (14) from pump body (16).

14. Remove gear (18) from gear assembly (11).

15. Remove gear (18) from gear assembly (10). Remove woodruff key (12) (not shown) from gear assembly (10).
    Show/hide table

    Illustration 9	g00564577

16. Remove gear assembly (10) and gear assembly (11) from pump body (15).
    Show/hide table

    Illustration 10	g02694298

17. Use Tooling (A) and a suitable press to remove bearings (19) from pump body (15).

18. Remove bolt dampers (20) from pump body (15).