988F and 988F Series II Wheel Loaders Power Train Caterpillar

Removal Procedure

Start By:

1. Remove the crankcase guards. Refer to 3408 Engine Supplement For 988F Wheel Loaders, SENR5725, "Crankcase Guards - Remove".

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Illustration 1	g00520743

1. Place Tooling (A) under the rear main frame. Raise the rear of the machine until the weight of the machine is supported by tooling (A) .

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Illustration 2	g00520744

2. Remove hose (2) for the oil drain.

3. Remove 12 bolts (3), the washers, and cover (1). Remove the gasket material from the contact surface on cover (1) .

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Illustration 3	g00520745

4. Remove gasket material (4) from the contact surface on the rear support.

5. Remove bolts (5), the washers, and plate (6) .

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Illustration 4	g00520747

6. Remove thrust bearing (7) .

7. Disconnect the tube assembly from the grease fitting on the rear support.

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Illustration 5	g00520748

8. Remove bolts (8), the washers and the nuts that hold the rear support to the rear main frame. Remove the nuts that hold the front support to the rear main frame. Do not remove the front mounting bolts from the front support.

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Illustration 6	g00520749

9. Attach a suitable floor jack to rear support (9). Raise the rear of the machine with tooling (A) until the dowels in the rear support are free of the rear main frame. Remove rear support (9) from the rear axle housing. The weight of the rear support is 172 kg (379 lb).

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Illustration 7	g00520750

10. Remove O-ring seal (10) and sleeve bearing (11) from the rear support.

11. If necessary, remove the two locating dowels from the rear support.

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Illustration 8	g00520751

12. Remove sixteen bolts (12) and the washers from cover (13) .

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Illustration 9	g00520753

13. Attach a suitable floor jack to cover 13. Use two 7/8" - 9 NC forcing bolts to loosen the cover from the rear axle housing. Tighten the forcing bolts evenly in order to loosen the cover. Remove the cover. The weight of the cover is 64 kg (141 lb). Remove the O-ring seal from the cover.

Installation Procedure

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Illustration 10	g00521093

1. Install the O-ring seal on cover (1) .

2. Attach cover (1) to a suitable floor jack.

3. Place cover (1) in position on the rear axle housing. Install the sixteen bolts and the washers that hold the cover. Tighten the bolts to a torque of 475 ± 50 N·m (350 ± 37 lb ft).

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Illustration 11	g00521097

4. Install sleeve bearing (3) in the rear support. Sleeve bearing (3) must make contact with the counterbore in the rear support.

5. Install the O-ring seal in the rear support.

6. Install the two locating dowels if the dowels had been removed. The dowels must protrude 55.6 ± 1.5 mm (2.19 ± 0.06 inch) above the outside surface of the rear support.

7. Attach rear support (4) to a suitable floor jack. Place the rear support in position on cover (1) .

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Illustration 12	g00526679

8. Use Tooling (A) to lower the machine onto the front support and the rear support. Install the eight bolts, the washers, and the nuts that attach the rear support to the rear main frame. Install the washers and the nuts that attach the front support to the rear main frame. Tighten the twelve nuts to a torque of 1125 ± 100 N·m (825 ± 75 lb ft).

9. Connect the tube assembly to the grease fitting that is located on top of the rear support.

10. Install the thrust bearing in the rear support.

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Illustration 13	g00521094

11. Place plate (5) in position on the end of cover (1). Install the twelve bolts and the washers that hold the plate in position. Tighten the bolts to a torque of 270 ± 25 N·m (200 ± 18 lb ft).

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Illustration 14	g00521098

12. Apply 7M-7260 Liquid Gasket to the mating surfaces of cover (6) and the rear support. Install the cover on the rear support. Install the twelve bolts and the washers that hold the cover in position. Tighten the bolts to a torque of 270 ± 25 N·m (200 ± 18 lb ft).

13. Install the oil drain hose.

End By: Install the crankcase guards. Refer to 988F 3408 Engine Supplement For Wheel LoadersSENR5725, "Crankcase Guards - Install".