Pinion Depth Measurement

Fig 1: Pinion Gear Depth Gauge Tools

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Measurements are taken with pinion bearing cups and pinion bearings installed in the housing. Take measurements with Pinion Gauge Set 6730 (2,3,4,5,6,7,8) and Dial Indicator C-3339A (1).

Fig 2: Pinion Height Block

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1. Assemble Pinion Height Block 6739 (2), Pinion Block 9990 (1) and rear pinion bearing onto Screw 6741.
2. Insert assembled height gauge components, rear bearing and screw into the housing through pinion bearing cups.
3. Install front pinion bearing and Cone-nut 6740. Tighten nut until a Torque To Rotate the screw is 2.25 N.m (20 in. lbs.).
   Fig 3: Arbor Discs

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4. Place Arbor Disc 8541 (1) on Arbor D-115-3 (2) in position in the housing side bearing cradles.
   NOTE: Arbor Discs 8541 has different step diameters to fit other axles. Choose proper step for axle being serviced.
   Fig 4: Discs & Bearing Caps

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5. Install differential bearing caps (1) on arbor discs (2) and install bearing cap bolts. Tighten bearing cap bolts to 108 N.m (80 ft. lbs.).
   Fig 5: Depth Measurement

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6. Assemble Scooter Block D-115-2A (1) and Dial Indicator C-3339A (2) 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 (1) across the pinion height block over to the arbor. Move the scooter block till dial indicator (2) crests the arbor, then record the highest reading.
9. Select a shim equal to the dial indicator reading plus or minus the pinion depth variance number etched in the face of the pinion. Example:  If the depth variance is -2, add 0.002 in. to the dial indicator reading. If the depth variance is +2, subtract 0.002 in. from the dial indicator reading.

   The total is the shim thickness needed for the pinion depth variance.