Drive Pinion Gear Height and Pinion Bearing Preload

DRIVE PINION GEAR HEIGHT AND PINION BEARING PRELOAD





1. Make sure all parts are clean and that the bearings are well lubricated.
2. Assemble the pinion gear bearings into Tool.
Tool number (J34309)





^ Drive Pinion Front 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, J343095, to secure the bearing in its proper position.
^ Drive Pinion Rear Bearing-the rear pinion bearing pilot, J34309-15, 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 differential shim selector tool, J34309, gauge screw . assembly with the pinion rear bearing inner cone installed into the final drive housing.





4. Assemble the drive pinion front 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 degrees, and tighten the two sections together by hand.





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





6. Measure the drive pinion preload without front oil seal resistance at the end of the J34309-2 gauge anvil using Tool.
Drive pinion preload without front oil seal resistance: 1.0 - 1.3 Nm (10 - 13 kg-cm, 8.7 - 11.3 inch lbs.)
Tool number ST3127S000 (J25765-A)





7. Place the J34309-1 "R200A" pinion height adapter onto the gauge plate and tighten it by hand.

DRIVE PINION BEARING PRELOAD WASHER SELECTION





CAUTION: Make sure all machined surfaces are clean.





8. Place the solid pinion bearing spacer, small end first, over the J34309-2 gauge anvil and seat the small end squarely against the tip of the J34309-1 gauge screw in the tool recessed portion.








9. Select the correct thickness of drive pinion bearing preload adjusting washer using a standard gauge of 3.5 mm (0.138 inch) and J34309-101 feeler gauge. The exact measure is the thickness of the drive pinion adjusting washer required. Select the correct drive pinion bearing preload adjusting washer.
Drive pinion bearing preload adjusting washer: Refer to Specifications.
10. Set the selected, correct drive pinion bearing preload adjusting washer aside for use when assembling the drive pinion and bearings into the final drive.

DRIVE PINION HEIGHT ADJUSTING WASHER SELECTION





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





12. Install the side bearing caps and tighten the side bearing cap bolts.
Side bearing: 88 - 98 Nm (9 - 10 kg-m, 65 - 72 ft. lbs.) cap bolts





13. Select the correct drive pinion height adjusting washer thickness by using a standard gauge of 3.0 mm (0.118 inch) and J34309-101 feeler gauge. Measure the gap between the J34309-11 "R200A" pinion height adapter and the arbor.
14. Write down the exact total measurement.





15. Correct the drive pinion height adjusting washer size by referring to the "drive pinion head number".
^ There are two numbers painted on the drive pinion. The first one refers to the drive 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 "drive pinion head height number", and it refers to the ideal drive pinion height for quietest operation.
^ Use the following chart to determine the correct drive pinion height adjusting washer.





16. Select the correct drive pinion height adjusting washer.
Drive pinion height adjusting washer: Refer to Specifications.





17. Remove the J34309 pinion preload shim selector tool from the final drive housing and disassemble to retrieve the pinion bearings.