980G Wheel Loader Power Train Caterpillar

Assembly Procedure

Note: Cleanliness is an important factor. Before assembly, 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. Inspect all parts. If any parts are worn or damaged, use new parts for replacement.

1. Put clean oil on all internal parts of the hydraulic control valve.

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Illustration 1	g00500346

2. Install one retainer (53), spring (54), one retainer (53) and retaining ring (52) on spool (55) .

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Illustration 2	g00500345

3. Install spool (55) and stop (51) in lower valve body (46) .

4. Install O-ring seal (50), cover (49) and two bolts (48) on lower valve body (46). Tighten the bolts to a torque of 30 ± 7 N·m (22 ± 5 lb ft).

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Illustration 3	g00500343

5. Install the O-ring seals and two plugs (47) in plate (13) .

6. Install plate (13) on lower valve body (46) .

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Illustration 4	g00500342

7. Install one retainer (45), spring (44), one retainer (45) and retaining ring (43) on spool (42) .

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Illustration 5	g00500340

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Illustration 6	g00500339

8. Install spool (42) and stop (41) in upper valve body (12) .

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Illustration 7	g00500337

9. Carefully install ball (37), spring (38), retainer (39) and retaining ring (40) in spool (35) .

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Illustration 8	g00500336

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Illustration 9	g00500333

Note: When you install spool (35), avoid scratching the highly finished surfaces of spool (35) and the bore of upper valve body (12) .

10. Install slug (36) in spool (35). Install spool (35) in upper valve body (12) .

11. Install springs (34) and (33) in upper valve body (12) .

12. Install spacers (32) in upper valve body (12) .

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Illustration 10	g00500330

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Illustration 11	g00500329

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Illustration 12	g00500328

Note: Spool (27) and spool (22) are located in the same bore of upper valve body (12). Spool (27) must be installed from the end opposite spool (22) .

13. Use the following procedure to install spool (27) in upper valve body (12) :

    1. Turn upper valve body (12) to the opposite side and position upper valve body (12) on wood blocks, as shown. Make sure that pin (28) is clear of the bore.

    2. Install slug (30), spring (29) and spool (28) in upper valve body (12) .

    3. Use a screwdriver to slightly depress spool (27) .

    4. Use a hammer and a punch to install pin (28) in the hole. Remove the screwdriver.

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Illustration 13	g00500327

14. Install spring (23), spring (24), retainer (25) and retaining ring (26) on spool (22) .

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Illustration 14	g00500322

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Illustration 15	g00500299

15. Install spool (22) and spring (21) in upper valve body (12) .

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Illustration 16	g00500298

16. Install one retainer (20), spring (19), one retainer (20) and retaining ring (18) on spool (17) .

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Illustration 17	g00500296

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Illustration 18	g00500294

17. Install spool (17) and stop (16) in upper valve body (12) .

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Illustration 19	g00500292

18. Install O-ring seals, cover (15) and bolts (14) on upper valve body (12). Tighten the bolts to a torque of 30 ± 7 N·m (22 ± 5 lb ft).

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Illustration 20	g00500291

19. Install upper valve body (12) on plate (13) .

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Illustration 21	g00500285

20. Install manifold (10) on upper valve body (12) .

21. Install 21 bolts (11) in manifold (10). Tighten the bolts to a torque of 30 ± 4 N·m (22 ± 3 lb ft).

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Illustration 22	g00500283

22. Install manifold (3) and wiring harness (9) on manifold (10) .

23. Install bolts (8) in manifold (3). Tighten the bolts to a torque of 30 ± 4 N·m (22 ± 3 lb ft).

24. Install the bolts for the clamps that hold wiring harness (9) .

25. Install connector (7) on manifold (3) .

End By: Install the transmission hydraulic control valve. Refer to Disassembly and Assembly, "Transmission Hydraulic Control Valve - Install" for the machine that is being serviced.