Model H190A

NOTE:
For quiet and reliable final drive operation, the following five adjustments must be made correctly:
1. Side bearing preload.
2. Pinion gear height.
3. Pinion bearing preload.
4. Ring gear-to-pinion backlash.
5. Ring and pinion gear tooth contact pattern.

1. Make sure all parts are clean and that the bearings are well lubricated.
2. Assemble the pinion gear bearings into the pinion pre-load shim selector Tool, J34309.
- Front Pinion Bearing: Make sure the J34309-3 front pinion bearing is secured tightly against the J34309 gauge anvil. Then turn the front pinion bearing pilot J34309-5 to secure the bearing in its proper position.





- Rear Pinion Bearing: The rear pinion bearing pilot, J3430915, is used to center the rear pinion bearing only. The rear pinion bearing locking seat, J34309-4 is used to lock the bearing to the assembly.





3. Place the pinion pre-load shim selector Tool J34309-1 gauge screw assembly with the pinion rear bearing inner cone installed into the final drive housing.





4. Assemble the front pinion bearing inner cone and the J34309-2 gauge anvil together with the J34309-1 gauge screw in the final drive housing. Make sure that the pinion height gauge plate, J34309-16, will turn a full 360, and tighten the two sections together by hand.





5. Turn the assembly several times to seat the bearings.





6. Measure the turning torque at the end of the J34309-2 gauge anvil using Tool number ST3127S000 (J25765-A).
Turning torque specification: 1.0 - 1.3 Nm (8.7 - 11.3 inch lbs.)





7. Place the J34309-14 pinion height adapter onto the gauge plate and tighten it by hand.

CAUTION: Make sure all machined surfaces are clean.





Pinion Height Adjusting Washer Selection
8. Now, position the side bearing discs, J25269-18, and arbor firmly into the side bearing bores.
9. Install the side bearing caps and torque the cap bolts.
Specification: 49 - 59 Nm (36 - 43 ft. lbs.)
10. Select the correct standard pinion height adjusting washer thickness by using J34309-101 feeler gauge. Measure the gap between the J34309-14 pinion height adapter and the arbor.
11. Write down your exact total measurement.
12. Correct the pinion height washer size by referring to the "pinion head number".





- There are two numbers painted on the pinion gear. The first one refers to the pinion and ring gear as a matched set and should be the same as the number on the ring gear. The second number is the "pinion head height number," and it refers to the ideal pinion height from standard for quietest operation.





- Select the correct pinion height washer. Refer to the illustration for the drive pinion height adjusting washers.