986H Wheel Loader Machine Systems Caterpillar

Assembly Procedure

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Illustration 1	g02674083

1. Use the proper equipment to handle bearing cone (32). Raise the temperature of bearing cone (32). Install bearing cone (32) onto the shaft assembly (27).
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   Illustration 2	g02673122

2. Use the proper equipment to handle the bearing cup. Lower the temperature of bearing cup (31) and install bearing cup (31) in pump body (5).
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   Illustration 3	g02673116

3. Install plugs (30) and the O-ring seals in pump body (5).
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   Illustration 4	g00670302

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   Illustration 5	g02673076

4. Use Tooling (A) to install lip seal (29). Install retaining ring (28).
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   Illustration 6	g02673056

5. Install shaft assembly (27).

6. Use the following steps to determine the proper preload on the bearings of the pump assembly.
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   Illustration 7	g02672881

   1. Use the proper equipment to handle the bearing cup. Lower the temperature of bearing cup (8) and install the bearing cup in head assembly (4).
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      Illustration 8	g02674239
      Typical Example

   2. Install adjustment shim (11) and bearing cone (10) onto shaft assembly (27).
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      Illustration 9	g06227552

   3. Install bolts (3) in head assembly (4) and pump body (5). Tighten bolts (3) to a torque of 160 ± 30 N·m (120 ± 20 lb ft).
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      Illustration 10	g06227770

   4. Use Tooling (C), Tooling (D), and Tooling (E) to check end play in shaft (27). End play must be between 0.00 - 0.05 mm (0.000 - 0.002 inch). If the dimension is not met, repeat Step 6 and adjust the shim until the correct dimension between the head and the pump housing is reached.

   5. Remove bolts (3) and head assembly (4) from pump body (5). Remove bearing cone (10) and adjustment shim (11) from shaft assembly (27).

   6. Proceed with the assembly of the piston pump.
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   Illustration 11	g02673044

7. Install bearings (26).
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   Illustration 12	g02673039

8. Install spring (25).
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   Illustration 13	g02673016

9. Install swashplate (24).
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   Illustration 14	g02672983

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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.

   Note: Ensure that there is a correct connection of the piston rod and the swashplate. The piston rod must lock into the swashplate.

10. Install piston rod (23).
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    Illustration 15	g02672980

11. Install control piston (22).
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    Illustration 16	g02672956

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    Illustration 17	g02672924

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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.

12. Install pins (18), guide (19), and spring (20) in barrel assembly (16).

13. Use Tooling (A) and a suitable press to compress spring (20) in barrel assembly (16) and install retaining ring (21).

14. Slowly release compression on spring (20). Make sure that retaining ring (21) is seated properly.
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    Illustration 18	g02672921

15. Install retaining ball (17) onto barrel assembly (16).
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    Illustration 19	g02672917

16. Install the retainer and piston assemblies (15) into barrel assembly (16).
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    Illustration 20	g02672912

17. Install rotary group (14) onto the shaft. Make sure that the splines are aligned properly.
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    Illustration 21	g02672909

18. Install O-ring seal (13) on plug (12).
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    Illustration 22	g02672906

19. Install plug (12).
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    Illustration 23	g02672902

20. Install the adjustment shim (11).
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    Illustration 24	g02672900

21. Install bearing cone (10) on the shaft.
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    Illustration 25	g02672896

22. Install O-ring seal (9).
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    Illustration 26	g02672800

23. Install O-ring seal (6) and port plate (7) on head assembly (4).
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    Illustration 27	g06227552

24. Install head assembly (4) and bolts (3) onto pump body (5). Tighten bolts (3) to a torque of 160 ± 30 N·m (120 ± 20 lb ft).
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    Illustration 28	g06227545

25. Install bolts (1), valve group (2), and the gasket onto the piston pump.

End By:

1. Install the Piston Pump (Hydraulic fan).