Drive Pinion Height
- Drive gear and drive pinion are supplied in matched sets only. Matching numbers on both drive pinion and drive gear are etched for verification. If a new gear set is being used, verify the numbers of each drive pinion and drive gear before proceeding with assembly.
- The mounting distance from the centerline of the drive gear to the back face of the drive pinion for the M205 final drive assembly is 103.5 mm (4.0748 inches).
On the button end of each drive pinion, there is etched a plus (+) number, a minus (-) number, or a zero (0), which indicates the best running position for each particular gear set. This dimension is controlled by a selective drive pinion height adjusting washer between the drive pinion rear bearing inner race and drive pinion.
For example: If a drive pinion is etched m+8 (+3), it would require 0.08 mm (0.003 inch) less drive pinion height adjusting washer than a drive pinion etched "0". This means decreasing drive pinion height adjusting washer thickness; increases the mounting distance of the drive pinion to 103.6 mm (4.0778 inches). If a drive pinion is etched m-8 (-3), it would require adding 0.08mm (0.003 inch) more to the drive pinion height adjusting washer than would be required if the drive pinion were etched "0". By adding 0.08 mm (0.003 inch), the mounting distance of the drive pinion was decreased to 103.4 mm (4.0718 inches) which is just what a m-8 (-3) etching indicated.
- To change the drive pinion height, use different drive pinion height adjusting washers which come in different thickness.
- Use the following tables as a guide for selecting the correct drive pinion height adjusting washer thickness to add or subtract from the old drive pinion height adjusting washer.
| OLD DRIVE PINION MARKING | NEW DRIVE PINION MARKING mm (in) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| -10 (-4) | -8 (-3) | -5 (-2) | -3 (-1) | 0 (0) | +3 (+1) | +5 (+2) | +8 (+3) | +10 (+4) | |
| +10 (+4) | +0.20 (+0.008) | +0.18 (+0.007) | +0.15 (+0.006) | +0.13 (+0.005) | +0.10 (+0.004) | +0.08 (+0.003) | +0.05 (+0.002) | +0.02 (+0.001) | 0 (0) |
| +8 (+3) | +0.18 (+0.007) | +0.15 (+0.006) | +0.13 (+0.005) | +0.10 (+0.004) | +0.08 (+0.003) | +0.05 (+0.002) | +0.02 (+0.001) | 0 (0) | -0.02 (-0.001) |
| +5 (+2) | +0.15 (+0.006) | +0.13 (+0.005) | +0.10 (+0.004) | +0.08 (+0.003) | +0.05 (+0.002) | +0.02 (+0.001) | 0 (0) | -0.02 (-0.001) | -0.05 (-0.002) |
| +3 (+1) | +0.13 (+0.005) | +0.10 (+0.004) | +0.08 (+0.003) | +0.05 (+0.002) | +0.02 (+0.001) | 0 (0) | -0.02 (-0.001) | -0.05 (-0.002) | -0.08 (-0.003) |
| 0 (0) | +0.10 (+0.004) | +0.08 (+0.003) | +0.05 (+0.002) | +0.02 (+0.001) | 0 (0) | -0.02 (-0.001) | -0.05 (-0.002) | -0.08 (-0.003) | -0.10 (-0.004) |
| -3 (-1) | +0.08 (+0.003) | +0.05 (+0.002) | +0.02 (+0.001) | 0 (0) | -0.02 (-0.001) | -0.05 (-0.002) | -0.08 (-0.003) | -0.10 (-0.004) | -0.13 (-0.005) |
| -5 (-2) | +0.05 (+0.002) | +0.02 (+0.001) | 0 (0) | -0.02 (-0.001) | -0.05 (-0.002) | -0.08 (-0.003) | -0.10 (-0.004) | -0.13 (-0.005) | -0.15 (-0.006) |
| -8 (-3) | +0.02 (+0.001) | 0 (0) | -0.02 (-0.001) | -0.05 (-0.002) | -0.08 (-0.003) | -0.10 (-0.004) | -0.13 (-0.005) | -0.15 (-0.006) | -0.18 (-0.007) |
| -10 (-4) | 0 (0) | -0.02 (-0.001) | -0.05 (-0.002) | -0.08 (-0.003) | -0.10 (-0.004) | -0.13 (-0.005) | -0.15 (-0.006) | -0.18 (-0.007) | -0.20 (-0.008) |