PINION BEARING ADJUSTMENT

In installing a new pinion, the pinion bearing construction is such that no end play is desired. Two Timken bearings are assembled to the pinion shaft ahead of the pinion itself. The rear Timken bearing takes the thrust in the forward direction and the forward pinion bearing takes the thrust in the reverse direction. A straight roller bearing is assembled to the inner end of the pinion. This eliminates any possibility of lift or misalignment, regard- less of end play, and prevents the pinion from losing the correct contact with the ring gear.

The correct adjustment of the pinion bearing is .002 loose, or a free rolling fit. This adjustment is made by upsetting the lock- washer, backing off jam nut and tightening the adjusting nut until the desired fit is obtained.

It is a good plan to use an indicator in check- ing bearing end play (see Fig. 828). This lessens the possibility of getting too loose or too tight a fit. After the correct adjustment is made, lock the adjusting nut with lock washer and jam nut.

Always check the end play after assembly. This is important, as in tightening the jam nut- the adjustment is often changed. As previously stated, the end play should be a free rolling fit or .002 loose.

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