Pinion Depth Variance

Fig 1: Pinion Variance and Sequence Numbers

Courtesy of DAIMLERCHRYSLER CORP.

Ring gear and pinion are supplied as matched sets. Identifying numbers for the ring gear and pinion are painted onto the pinion gear shaft and the side of the ring gear. A plus (+) number, minus (-) number or zero (0) along with the gear set sequence number (01 to 99) is on each gear. The pinion depth variance (1) is the amount the depth varies from the standard depth setting of a pinion marked with a (0). The remaining numbers (2) are the sequence number of the gear set. The standard depth provides the best gear tooth contact pattern.

Fig 2: Pinion Depth Shim and Collapsible Washer

Courtesy of DAIMLERCHRYSLER CORP.

Compensation for pinion depth variance is achieved with select shims (3). The shims are sandwiched between the pinion head bearing cup (4) and axle housing.

If installing a new gear, note the depth variance number of the original and replacement pinion. Add or subtract this number from the original depth shim to compensate for the difference in the depth variances. The numbers represent deviation from the standard in microns. If the number is negative, add that value to the required thickness of the depth shims. If the number is positive, subtract that value from the thickness of the depth shim.