Pinion Depth Measurement

Front Axle - 248FBI

PINION GEAR DEPTH VARIANCE:

PINION DEPTH MEASUREMENT AND ADJUSTMENT
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. 5).

1. Assemble Pinion Height Block 6739, Pinion Block 6736 and rear pinion bearing onto Screw 6741 (Fig. 5).





2. Insert assembled height gauge components, rear bearing and screw into the housing through pinion bearing cups (Fig. 6).
3. Install front pinion bearing and Cone-nut 6740 hand tight (Fig. 5).





4. Place Arbor Disc 6732 on Arbor D-115-3 in position in the housing side bearing cradles (Fig. 7).

NOTE: Arbor Discs 6732 has different step diameters to fit other axles. Choose proper step for axle being serviced.

5. Install differential bearing caps on arbor discs and snug the bearing cap bolts. Then cross tighten cap bolts to 108 Nm (80 ft. lbs.).
6. Assemble Dial Indicator C-3339 into Scooter Block D-115-2 and secure set screw.
7. Position Scooter Block/Dial Indicator flush on the pinion height block. Hold scooter block and zero the dial indicator.





8. Slowly slide the scooter block across the pinion height block over to the arbor (Fig. 8). Move the scooter block till dial indicator crests the arbor, then record the highest reading.
9. Select a shim/slinger equal to the dial indicator reading plus the pinion depth variance number etched in the face of the pinion (Fig. 3). For example, if the depth variance is -2, add +0.002 inch to the dial indicator reading.