Toro Groundsmaster 3280-D Service Manual page 383

Groundsmaster ® 3280-D/3320
05138SL Rev B
Every gear has a characteristic pattern. The illustrations show typical
patterns only and explain how patterns shift as the gear location is changed.
When making pinion position changes, shims should be changed in the
range of 0.05 to 0.10 mm (0.002 to 0.004 inch) until a correct pattern has
been obtained.
When a change in backlash is required, backlash shims should be changed
in the range of 1-1/2 times the amount of backlash necessary to bring the
gears into specification. For example, if the backlash necessary to be
changed by 0.10 mm (0.004 inch), the shim pack should be changed by 0.15
mm (0.006 inch) as a starting point.
High backlash is corrected by moving the ring gear closer to the pinion. Low
backlash is corrected by moving the ring gear away from the pinion. These
corrections are made by switching shims from one side of the differential
case to the other.
g226455
1. Heel
2. Drive side
Example 1: Backlash correct. Thicker pinion position shims necessary
(Figure 250).
g226456
1. Heel
2. Drive side
Example 2: Backlash correct. Thinner pinion position shims necessary
(Figure 251).
Figure 250
3. Toe
4. Coast side
Figure 251
3. Toe
4. Coast side
Page 8–41 Drive Axles: Service and Repairs