990K Wheel Loader Machine Systems Caterpillar

Illustration 1	g00103436

(1) Housing Bolts

Torque for the eight bolts that fasten the housings together ... 460 ± 70 N·m (340 ± 50 lb ft)

Torque-turn after reaching the specified torque ... 180 ± 10°

Illustration 2	g00103711

1. Put 5P-1730 Holding Fixture (2) in a vise and tighten the vise.
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   Illustration 3	g00103714

2. Install retainer (3) on the 5P-1730 Holding Fixture so that the notch in the retainer is aligned with the dowel on the holding fixture.
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   Illustration 4	g00103716

3. Install nut (4) (part of 5P-1730 Holding Fixture) on the threaded end of holding fixture (2). Tighten the nut against retainer (3) by hand.
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   Illustration 5	g00103717

4. Install bearing cup (8) and bearing cup (10) in pinion (5).

5. Install bearing cone (11) and spacer (9) on retainer (3).

6. Install pinion (5) on the retainer.

7. Install bearing cone (7) on the retainer.

8. Put the lock (13) in position on the retainer.
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   Illustration 6	g00103718

9. Install nut (6). While the pinion is turned slowly, use 5P-0964 Spanner Wrench (12) and a torque wrench to tighten the nut to a torque of 70 ± 15 N·m (52 ± 11 lb ft).

10. Bend the lock (13) so that the nut is held.

11. Remove nut (4).

12. Remove the pinion from the holding fixture.

13. Perform Step 1 through Step 12 for all four pinions before you install the pinions in the housing.

Note: After the pinions are installed in the differential case, place the differential case in a vise. Rotate one side gear clockwise for two revolutions. Then, rotate the gear counterclockwise for two revolutions. The torque that is needed to turn the assembled gears must not be more than 50 N·m (37 lb ft).