Pinion Depth Measurement

PINION GEAR DEPTH VARIANCE:

PINION DEPTH MEASUREMENT / Rear Axle - 8 1/4 Inch
Measurements are taken with pinion bearing cups and pinion bearings installed in the housing. Take measurements with Pinion Gauge Set and Dial Indicator C-3339 (Fig. 10).

1. Assemble Pinion Height Block 6739, Pinion Block 8540 and rear pinion bearing onto Screw 6741 (Fig. 10).






2. Insert assembled height gauge components, rear bearing and screw into housing through pinion bearing cups (Fig. 11).
3. Install front pinion bearing and Cone-Nut 6740 hand tight (Fig. 10).






4. Place Arbor Disc 8541 on Arbor D-115-3 in position in the housing side bearing cradles (Fig. 12). Install differential bearing caps on arbor discs and tighten cap bolts to 41 Nm (30 ft. lbs.).

NOTE: Arbor Discs 8541 has different step diameters to fit other axles. Choose proper step for axle being serviced.

5. Assemble Dial Indicator C-3339 into Scooter Block D-115-2 and secure set screw.
6. Place Scooter Block/Dial Indicator in position in axle housing so dial probe and scooter block are flush against the rearward surface of the pinion height block (Fig. 10). Hold scooter block in place and zero the dial indicator. Tighten dial indicator face lock screw.
7. Slowly slide the dial indicator probe over the edge of the pinion height block.






8. Slide the dial indicator probe across the gap between the pinion height block and the arbor bar with the scooter block against the pinion height block (Fig. 13). When dial probe contacts the arbor bar, the dial pointer will turn clockwise. Continue moving the dial probe to the crest of the arbor bar and record the highest reading. If the dial indicator can not achieve a zero reading, the rear bearing cup or the pinion depth gauge set is not installed correctly.
9. Select a shim equal to the dial indicator reading plus the drive pinion gear depth variance number marked on the shaft of the pinion. For example, if the depth variance is -2, add +0.002 inch to the dial indicator reading.