730C2 and 725C2 Articulated Truck Power Train Caterpillar

Assemble Procedure

Note: The same assembly procedure is used for the front differential pinion and for the rear differential pinion.

1. Inspect all parts and clean all parts. If any parts are worn or damaged, use new Caterpillar parts for replacement.

2. Pay attention to all location marks on all housings and case assemblies for assembly purposes.
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   Illustration 1	g06126895

3. Use suitable press to install bearing cone (17) onto pinion shaft (11). Install bearing cone (17).
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   Illustration 2	g06126917

4. Use suitable press and Tooling (A) to install bearing cup (16). Install bearing cup into the pinion housing.
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   Illustration 3	g06126902

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   Illustration 4	g06126784

5. Use suitable press and Tooling (A) to install bearing cup (15). Install bearing cup (15) into the pinion housing.
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   Illustration 5	g06126753

6. Lubricate O-ring seal (14) with the lubricant that is being used. Install O-ring seal (14).
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   Illustration 6	g06126908

7. Place pinion shaft assembly (11) on suitable cribbing.

8. Install pinion housing (12) onto pinion shaft assembly (11). Ensure that pinion shaft assembly (11) bearing is seated in the bearing cup on the pinion housing.

9. Raise the temperature of bearing cone (13). Install bearing cone (13) onto pinion shaft assembly (11).

10. Perform the following procedure for setting the bearing preload.

    1. Secure the pinion housing in a suitable holding fixture.
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       Illustration 7	g06126676

    2. Lubricate and install notched washer (10) and lock nut (9).
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       Illustration 8	g06126670

    3. Use Tooling (C) to tighten the locknut to achieve a rolling torque of 0.7 to 1.2 N·m (0.52 to 0.88 lb ft).

    4. Rotate the pinion several times to ensure that the bearings are fully seated.
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       Illustration 9	g06126665

    5. Install locking washer (8) so that the tabs line up with the notches on the notched washer. Locking washer (8) has eight different positions to align the tabs with the notches in the notched washer. If locking washer (8) does not fully align with the notched washer, position locking washer (8) so that locking washer is very close to fitting into the notches of the notched washer. Tighten the locknut until locking washer (8) fits into the notches of the notched washer.

    6. Measure again the rolling torque to confirm that the rolling torque is still 0.7 to 1.2 N·m (0.52 to 0.88 lb ft).

    7. If the rolling torque is 0.7 to 1.2 N·m (0.52 to 0.88 lb ft), use Tooling (B) to install retaining ring (7) into the groove of the locknut that is closer to the locking washer. Ensure that retaining ring (7) is fully seated in the groove.
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    Illustration 10	g06126658

11. Lightly coat bore surface in the retainer with axle lubricant. Use Tooling (A) to install seal (6).
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    Illustration 11	g06126655

12. Apply Tooling (E) to seal retainer (4). Install seal retainer (4) and bolts (5).
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    Illustration 12	g06126653

13. Install O-ring seal (3) inside the yoke assembly.
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    Illustration 13	g06126649

14. Install yoke assembly (2) and bolt (1).

End By:

1. Install the differential pinion.