725C2, 730C2 Ejector Articulated Trucks - Machine Systems Caterpillar

Assembly Procedure

Note: Apply a light film of 10W oil to all components before assembly.

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	g00789075

3. Position the gap in ring (60) over the weep hole. Use Tool (A) (not shown) to install ring (60) (not shown) into pump housing (33).

4. Install roller bearing cup (58) into pump housing (33).

5. Install shaft seal (59) into pump housing (33). Assemble shaft seal (59) so that the spring loaded sealing member is toward bearing cup (58), as shown.

6. Invert pump housing (33).
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   Illustration 2	g00603861

7. Install shaft seal (55) into pump housing (33). Assemble seal (55) so that the spring loaded sealing member is toward the pilot face, as shown.

8. Install O-ring seal (56) onto pump housing (33).

9. Invert pump housing (33) and support the pump housing on suitable cribbing.
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   Illustration 3	g00551343

10. Install roller bearing cone (54) onto pump shaft (53). Install roller bearing cone (54) and pump shaft (53) into pump housing (33).

11. Use the following steps to determine the preload on the bearing of the pump assembly.
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    Illustration 4	g00789125

    1. Install adjustment spacer (48) and roller bearing cone (42) on pump shaft (53).
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       Illustration 5	g00789089

    2. Install spacer (40) and bearing cup (39) into break off plug (34). Install pin (41) into brake off plug (34).

    3. Apply 9S-3263 Thread Lock Compound to the threads on piston guide (36) and plunger guide (38). Install the piston guide and the plunger guide into break off plug (34) and tighten to a torque of 130 N·m (96 lb ft).
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       Illustration 6	g00789138

    4. Position break off plug (34) onto pump housing (33). Install four socket head bolts (35) but do not tighten at this point.

    5. Use a feeler gauge to measure the distance between the break off plug and the pump housing. Take measurements at three equal locations on the surface between the break off plug and the pump housing.

    6. The average of the three dimensions should be zero to 0.050 mm (0.0020 inch).

    7. Adjustment spacer (48) must be replaced or ground to this dimension.

    8. When the correct dimension is achieved tighten four bolts (35) to 165 ± 30 N·m (122 ± 22 lb ft).

    9. Invert the pump.
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       Illustration 7	g00789180

    10. Use tooling (D), a suitable screwdriver, and a set of slip joint pliers to check the end play on shaft (53). If end play exists on the shaft assembly, repeat step 11 until the correct dimension is reached.

    11. Remove four socket head bolts (35) and break off plug (34) from the pump housing (33). Remove bearing (42) and adjustment spacer (48) from shaft (53).

    12. Proceed with the assembly of the piston pump.
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    Illustration 8	g00789206

12. Install two bearings (57) into pump housing (33).
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    Illustration 9	g00551364

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    Illustration 10	g00551373

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    Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

13. Install spring seat (65) and spring (64) into barrel (47), as shown.

14. Position barrel (47) in a suitable press, as shown. Use Tooling (C) and the press to compress spring (64). Use Tool (B) to install ring (63).
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    Illustration 11	g00551360

15. Install pin (62) into barrel (47).
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    Illustration 12	g00551357

16. Install O-ring plug (61) and the O-ring seal. Tighten O-ring plug (61) to a torque of 105 ± 10 N·m (77 ± 7 lb ft).
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    Illustration 13	g00551339

17. Install swashplate assembly (51) into pump housing (33).
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    Illustration 14	g00551336

18. Install nine piston assemblies (50), retraction plate (49), and bearing (52) onto swashplate assembly (51).
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    Illustration 15	g00551331

19. Install barrel (47) and spacer (48) into pump housing (33).
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    Illustration 16	g00551327

20. Install roller bearing cone (42) onto the pump shaft.

21. Install valve plate (45) onto the barrel.

22. Position spring (44) and control piston (43) onto the swashplate assembly.

23. Install O-ring seal (46) onto pump housing (33).
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    Illustration 17	g00789469

24. Install four O-ring seals (37) onto break off plug (34).
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    Illustration 18	g00551321

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    Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

25. Position break off plug (34) on pump housing (33), as shown. Install four socket head bolts (35). Tighten socket head bolts (35) to a torque of 165 ± 30 N·m (122 ± 22 lb ft).
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    Illustration 19	g00551260

26. Install valve stem (28), spring retainer (29), spring (30), spring (31) and seat (32) into pressure and flow compensator valve (2).

27. Install O-ring seal (19) onto plug (20).

28. Install adjustment screw (23), seal (21), adjustment nut (22), seal (24) and cap nut (25) into plug (20).
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    Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

29. Install plug (20) into pressure and flow compensator valve (2).

30. Install seal (27) and plug (26) into pressure and flow compensator valve (2).
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    Illustration 20	g00551252

31. Install valve stem (5), spring retainer (6), spring (7), spring (8), and seat (15) into pressure and flow compensator valve (2).
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    Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

32. Install O-ring seal (16) onto plug (17).

33. Install adjustment screw (18), seal (9), adjustment nut (10), seal (11) and cap nut (12) onto plug (17).

34. Install plug (17) into pressure and flow compensator valve (2).

35. Install seal (14) and plug (13) into pressure and flow compensator valve (2).
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    Illustration 21	g00551251

36. Install three O-ring seals (4) onto pressure and flow compensator valve (2).
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    Illustration 22	g00551023

37. Position pressure and flow compensator valve (2) on steering piston pump (1), as shown. Install four socket head bolts (3).

End By:

1. Install the piston pump (ejector and steering).