CAT Water Delivery System (WDS) and 785D WTR OEM Off-Highway Truck/Tractor Caterpillar

Disassembly Procedure

Start By:

1. Remove the piston motor.

Show/hide table



Illustration 1	g03415740

1. Remove four bolts (2). Remove pilot valve cover (3) from port plate housing (1) .

Show/hide table



Illustration 2	g03415741

2. Remove two O-rings (4) .

Show/hide table



Illustration 3	g03415742

3. Remove seven bolts (5). Remove port plate housing (1) .

Show/hide table



Illustration 4	g03415743

4. Remove pilot valve (8), and remove bushing (9) .

5. Remove lubrication tube (6A) and (6B) from port plate housing (1). Remove two pins (7). Remove bearing race (10) .

   Note: If installed, shims (not shown) are located between bearing race (10) and port plate housing (1) .

Show/hide table



Illustration 5	g03416221

6. Remove washer (11) from pilot valve (8). Remove spring (14), retaining ring (15), ring (16), spring (13), and retaining spring (12) from bushing (9) .

Show/hide table



Illustration 6	g03416227

7. Remove ring (17) and remove O-ring seal (18) from pipe (6A). Repeat this step for pipe (6B) .

   Note: The lubrication tube seal kit consists of ring (17) and O-ring (18) and a sealing washer (19). The ring and the O-ring are located on each lubrication tube (6A) and (6B). One washer is located in the bore of the port plate housing (1) for each lubrication tube.

Show/hide table



Illustration 7	g03415749

8. Remove piston (20) and piston (21). Remove port plate (22) .

9. Remove barrel assembly (23) from motor housing (24) .

   Note: Do not scratch the polished surface of the barrel or the swashplate.

Show/hide table



Illustration 8	g03416772

10. Remove piston seal (25) from piston (20). Repeat this step for the other piston (21) .

Show/hide table



Illustration 9	g03416806

11. Remove rod (26) from swashplate assembly (27) .

Show/hide table



Illustration 10	g03416856

12. Use a suitable press and tooling in order to remove bearing race (29) and bearing (30) from shaft (28) .

    Note: If necessary, apply heat to bearing race (29) to remove. If necessary, apply heat to bearing (30) to remove.

Show/hide table



Illustration 11	g03415755

Show/hide table



Illustration 12	g03415756

13. Remove swashplate assembly (31) from shaft (28) .

    Note: Mark the position of each piston to the barrel for assembly purposes.

    Note: Do not scratch the polished surface of the swashplate on swashplate assembly (31) .

Show/hide table



Illustration 13	g03416863

14. Remove four bolts (32) and two plates (33) from swashplate assembly (31) .

Show/hide table



Illustration 14	g03416864

Show/hide table



Illustration 15	g03416867

15. Use a suitable press and tooling in order to remove bearing (34) and washer (36) from shaft (28). Remove barrel (35) .

    Note: If necessary, apply heat to bearing (34) to remove.

Show/hide table



Illustration 16	g03416868

Show/hide table



Illustration 17	g03415767

Show/hide table

Personal injury can result from being struck by parts propelled by a released spring force. Make sure to wear all necessary protective equipment. Follow the recommended procedure and use all recommended tooling to release the spring force.

Note: Mark the orientation of the retaining ring (37) .

16. Use a suitable press to release the spring pressure. Use Tooling (A) to remove retaining ring (37) from barrel (35) .

17. Remove washer (40), spring (39), and washer (38) from barrel (35) .

Show/hide table



Illustration 18	g03415768

18. Use Tooling (A) to remove retaining ring (41) .

19. Use a suitable press and tooling in order to remove seal (42) from motor housing (24) .

Show/hide table



Illustration 19	g03415769

20. Use a suitable press and tooling in order to remove two cradle bearings (43) from motor housing (24). Remove two pins (44) .

21. Use a suitable press and tooling in order to remove bearing race (45) from motor housing (24) .

Show/hide table



Illustration 20	g03415771

22. Remove nine pistons (46) from washer assembly (47) .