Pinion Gear Height and Pinion Bearing Preload
PINION GEAR HEIGHT1. 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.
- 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.
- 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, J34309-5, to secure the bearing in its proper position.
3. Place the pinion preload shim selector tool gauge screw assembly, 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 to set bearing preload.
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 torque wrench J25765-A.
Turning torque specification: 0.4 - 0.9 Nm (4 - 9 kg-cm, 3.5 - 7.8 inch lbs.)
7. Place the J34309-12 "H23313" 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. Position the J25269-18 side bearing discs and the arbor into the side bearing bores.
9. Install the bearing caps and torque the bolts.
Specification: 93 - 103 Nm (9.5 - 10.5 kg-m, 69 - 76 ft. lbs.)
10. Select the correct standard pinion height adjusting washer thickness using a standard gauge of 2.5, 3.0, or 3.5 mm (0.098, 0.118, or 0.138 inch) and the J34309-101 feeler gauge. Measure the distance between the J34309-12 "H23313" pinion height adapter and the arbor.
11. Write down the exact total measurement.
12. Correct the pinion height washer size by referring to the "pinion head height 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 the quietest operation.
Use the chart to determine the correct pinion height washer. Refer to "Drive Pinion Height Adjustment", under Specifications; Mechanical.
13. Select the correct pinion height washer.
Drive pinion height adjustment:
Refer to "Drive Pinion Height Adjustment", under Specifications; Mechanical.
14. Remove the J34309 pinion preload shim selector tool from the final drive housing and disassemble to retrieve the pinion bearings.