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

Assembly Procedure

Note: Cleanliness is an important factor. Before the assembly procedure, all parts should be thoroughly cleaned in cleaning fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts. Lint may be deposited on the parts which may cause later trouble.

1. Check all of the O-ring seals and the components for wear or damage. Replace the components, if necessary.

2. Lubricate all of the O-ring seals lightly with the lubricant that is being sealed.
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   Illustration 1	g00523671

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   Illustration 2	g00523672

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   Illustration 3	g00523670

3. Install quick-connect coupling (51) to cover (43).

4. Use six bolts (49) in order to install tube (50).

5. Install four bolts (42) from cover (43) in order to install the following items: retainer (47), plate (46), sight glass (45) and seal (44).

6. Repeat Step 5 in order to install the remaining retainer (48).

7. Clean the mating surfaces of tank (40) and cover (43).

8. Use 44 bolts (41) and the washers in order to connect tank (40) and the gasket to cover (43).
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   Illustration 4	g00523647

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   Illustration 5	g00523644

9. Install bolt (28) onto cover (27). Tighten bolt (28) to a torque of 60 ± 5 N·m (44.3 ± 3.7 lb ft).

10. Install the following items onto bolt (28) and cover (27): spring (34), spring (35), seat (36), valve (37), spring (38) and retainer (39).
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    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.

11. Position bolt (28) and cover (27) into a suitable bench vise. Use the bench vise to compress the springs so that pin (33) can be installed.

12. Install pin (33) onto bolt (28).

13. Install O-ring seal (32) onto cover (27).
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    Illustration 6	g00523643

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    Illustration 7	g00526772

14. Install screen (31) and element (30) into steering tank (1).

15. Install cover (27) and bolt (28) onto steering tank (1).

16. Install plug (29) and the O-ring seal onto cover (27).
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    Illustration 8	g00523679

17. Install cap (22) and ball (24) into cap (21).

18. Install plate (25), gasket (26) and retaining ring (23) onto cap (21).
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    Illustration 9	g00523641

19. Install cap (21) onto steering tank (1).
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    Illustration 10	g00523678

20. Install O-ring seal (20) onto poppet (15).

21. Install poppet (15), spring (16) and spacer (17). Use Tooling (A) (not shown) in order to install retaining ring (18) into valve (10).

22. Install O-ring seal (19) onto valve (10). Install wear sleeve (14) onto valve (10).
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    Illustration 11	g00523677

23. Install O-ring seal (13) onto valve (6).

24. Install spring (11) and valve (10) into valve (6).

25. Install O-ring seal (12) onto adapter (9). Install adapter (9) onto valve (6).
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    Illustration 12	g00523676

26. Install valve (6) onto steering tank (1).
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    Illustration 13	g00523675

27. Install element (8) onto valve (6).
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    Illustration 14	g00523674

28. Install cover (7) onto valve (6). Use Tool (A) (not shown) in order to install retaining ring (5) onto valve (6).
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    Illustration 15	g00526905

29. Install plug (4) into adapter (3).
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    Illustration 16	g00523673

30. Use two bolts (2) in order to install adapter (3) and the gasket onto steering tank (1).

End By:

1. Install the steering tank and filter. Refer to Disassembly and Assembly, "Steering Tank and Filter - Install".