Pinion Gear Height and Pinion Bearing Load

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 seat is secured tightly against the J34309-2 gauge anvil. Then turn the front pinion bearing pilot, J34309-7, to secure the bearing in its proper position.








- Rear Pinion Bearing - the rear pinion bearing pilot, J34309-8, 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 preload shim selector tool gauge screw, J34309-1, with the pinion rear bearing inner cone installed, into the final drive housing.





4. Install the J34309-2 gauge anvil with the front pinion bearing into the final drive housing and assemble it to the J34309-1 gauge screw. Make sure that the J34309-16 gauge plate will turn a full 360 degrees, and tighten the two sections by hand.





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





6. Measure the turning torque at the end of the J34309-2 shaft using Tool number: ST3127S000 (J25765-A)
Turning torque specification: 0.6 - 1.0 Nm (5.2 - 8.7 inch lbs.)
7. Place the J34309-10 "R180A" pinion height adapter onto the gauge plate and tighten it by hand.

CAUTION: Make sure all machined surfaces are clean.





Pinion Bearing Preload Washer Selection
8. Place the solid pinion bearing adjusting spacer squarely into the recessed portion of the J34309-2 gauge anvil.








9. Select the correct thickness of pinion bearing preload adjusting washer using a standard gauge of 6 mm (0.24 inch) and J34309-101 feeler gauge. The exact total measure you get with the gauges is the thickness of the adjusting washer required. Select the correct washer. Refer to the illustration.
10. Set the selected pinion bearing preload adjusting washer aside for use when assembling the pinion and bearings into the final drive housing.





Pinion Height Adjusting Washer Selection
11. Place the J34309-10 pinion height adapter onto the gauge plate and tighten by hand.

CAUTION: Make sure all machined surfaces are clean.





12. Position firmly the side bearing discs, J25269-4, and arbor into the side bearing bores.





13. Select the correct standard pinion height adjusting washer thickness using a standard gauge of 3 mm (0.12 inch) and J34309-101 feeler gauge. Measure the distance between the J34309-10 "R180A" pinion height adapter and the arbor.





14. Write down your exact total measurement.
15. 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. Use the chart to determine the correct pinion height washer.





16. Select the correct pinion height washer. Refer to the illustration for the drive pinion height adjusting washers.
17. Remove the J34309 pinion preload shim selector tool from the final drive housing and disassemble to retrieve the pinion bearings.