Toro Groundsmaster 4500-D Series Service Manual page 399

Installation (continued)
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
1
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1. Vise
2. Differential gear case
5. Secure the differential case in a soft jawed vise. Position a dial indicator on a
tooth of the differential pinion gear. Press the pinion and side gear against
the differential case and measure the pinion gear to side gear backlash
(Figure 269).
PINION GEAR TO SIDE GEAR BACKLASH: 0.10 to 0.40 mm (0.004 to
0.016 in)
6. Adjust backlash by increasing or reducing side gear shim thickness.
Note: Side gear shims are available in 1.10 mm (0.043 in), 1.20 mm (0.047
in) and 1.30 mm (0.051 in) thickness.
7. Apply gear marking compound, such as DyKem Steel Blue lightly over
several gear teeth.
8. While applying a light load to either side gear, rotate either pinion gear until
the side gears have made one complete revolution.
More than 35% total tooth contact
g276536
9. Ideal tooth contact should cover more than 35% of each tooth surface. The
contact area should be in the center of each tooth and extend 1/3 to 1/2 way
across each tooth from the toe (small) end
10. Adjust side gear shims if necessary to correct tooth contact. Recheck
differential pinion gear to side gear backlash if any changes are made.
11. After backlash and tooth contact have been adjusted, align the hole in the
differential pinion shaft with the hole in the differential case and install a
new spring pin.
12. Install differential gear assembly in right side axle support half.
3
2
Figure 269
3. Dial indicator
1/3 to 1/2 of entire width
from small end of tooth
Figure 270
Page 7–41 Axles, Planetaries and Brakes: Service and Repairs
(Figure 270).