Drive Pinion Installation

FIG. 44 Ring Gear and Tooth Contact:

Two separate adjustments affect drive pinion and ring gear tooth contact. They are pinion depth (location) and backlash. The pinion locating shim pack is installed between the drive pinion inner bearing cup and carrier housing (Fig. 44). This shim pack and inner oil slinger and oil baffle controls the position of the pinion. Adding shims moves the pinion toward the ring gear and removing shims moves the pinion away from the ring gear.

FIG. 45 Ring Gear and Drive Pinion-Standard and Metric:

Ring gears and pinions are supplied in matched sets with standard or metric markings (Fig. 45).

FIG. 46 Shim Adjustment for Pinion Replacement-Standard:

FIG. 47 Shim Adjustment for Pinion Replacement-Metric:

On the face of each drive pinion is marked a plus figure +, a minus figure - or a zero 0. These figures indicate the position for each gear set. The position is determined by the amount of shims between the inner pinion bearing cup and carrier bearing bore. Refer to the charts in Figs. 46 and 47.

For example, if a new pinion is marked "positive" +3 (+8-metric) and an old pinion is marked 0, shims measuring (0.003 inch) 0.O8mm must be removed between the drive pinion and inner bearing cup and retainer.

If the old ring and pinion shim pack is used, measure the slinger and baffle and each shim separately and add each shim measurement to total the original measurement. Replace the old shims with new shims that equal this measurement.

If a new ring and pinion is being installed, note the plus +, minus - or zero 0 marking on the button of the pinion. Refer to the chart in Fig. 46 or Fig. 47. Add or subtract shims, according to the chart to compensate for differences between the old and new pinion.

A new ring gear and drive pinion is always installed as a matched set and never separately. Be sure that the same matching number appears on both the drive pinion and ring gear.

Install the correct shim pack of the drive pinion and place the pinion in the carrier. Check pinion depth.