Pinion Gear Height & Pinion Bearing Preload

Fig. 18 Pinion Gear Height & Pinion Bearing Preload Adjustment:

For quiet and reliable final drive operation, the following adjustment must be made correctly.
1. Ensure all parts are clean and bearings are well lubricated.
2. Assemble pinion gear bearings into pinion preload shim selector tool No. J-34309 or equivalent.
a. Ensure front pinion bearing seat tool No. J-34209-3 or equivalent, is secured tightly against gauge anvil tool No. J-34309-2 or equivalent. Turn front pinion bearing pilot tool No. J-34309-5 or equivalent, to secure bearing in its proper position.
b. Rear pinion bearing pilot tool No. J-34309-8 or equivalent, is used to center rear pinion bearing only. Rear pinion bearing locking seat tool No. J-34309-4 or equivalent, is used to lock bearing to assembly.
c. Place a suitable .098 inch thick plain washer between tools J-34309-9 and J34309-16 or equivalent. Both surfaces of tools must be parallel with a clearance of .098 inch.
3. Place pinion preload shim selector tool J-34309-1 or equivalent, gauge screw assembly with pinion rear bearing inner race installed into final drive housing. Fig. 18.
4. Assemble front pinion bearing inner race and gauge anvil tool No. J34309-2 or equivalent, together with gauge screw tool No. J34309-1 or equivalent, in final drive housing. Ensure pinion height gauge plate tool No. J34309-16 or equivalent, will turn 360°, and tighten two sections together by hand.
5. Turn assembly several times to seat bearings.
6. Measure turning torque at end of anvil gauge tool No. J-34209-2, using a suitable torque wrench. Allowable torque is 8.7-11.3 inch lbs.
7. Place pinion height adaptor tool No. J34309-11 or equivalent, onto gauge plate and tighten by hand.

Fig. 19 Solid Pin Pinion Bearing Spacer Placement:

8. Place solid pin pinion bearing spacer, small end first, over gauge anvil tool No. J-34309-2 or equivalent, and set small end squarely against tip of gauge screw tool No. J-34309-1 or equivalent, in tool recessed portion. Fig. 19.
9. Select correct thickness of pinion bearing preload adjusting washer using a standard gauge of 0.138 inch and feeler gauge tool No. J-34309-101 or equivalent. Exact measurement from gauges is thickness of adjusting washer required.
10. Set correct adjusting washer aside for use when assembling pinion gear and bearings into final drive.
11. Position side bearing disc tools No. J-25269-4 or equivalent, and arbor firmly into side bearing bores. Install side bearing caps and torque to 65-72 ft. lbs.
12. Select correct standard pinion height adjusting washer thickness using a standard gauge of 0.12 inch and feeler gauge tool No. J-34309-101 or equivalent. Measure distance between pinion height adaptor tool No. J-34309-11 or equivalent, including standard gauge and arbor.

Fig. 20 Pinion Height Washer Specifications:

13. Write down exact measurement (value of feeler gauge). Correct pinion height washer size by referring to pinion head number as follows:
a. There are two numbers painted on pinion gear. First number refers to pinion and ring gear as a matched set and should be same as number on ring gear.
b. Second number is ``pinion head height number,'' and it refers to ideal pinion height from standard for quietest operation.
c. Refer to Fig. 20 to determine correct pinion height washer.
14. Remove pinion preload shim selector tool No. J-34309 from final drive housing and disassemble to retrieve pinion bearings.