Toro Groundsmaster 4500-D Series Service Manual page 402

Pinion Gear to Ring Gear Engagement (continued)
Axles, Planetaries and Brakes: Service and Repairs
g276539
1. Input shaft/pinion gear
2. Bearing case shims
3. While applying a light load to the ring gear, rotate the pinion gear in the
direction of forward travel until the ring gear has made one complete
revolution.
Ideal tooth contact observed on the ring gear 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 end
Adjustments to the gear contact position are made by moving the input
shaft/pinion gear (bearing case shims) or by moving the differential gear case
(differential bearing shims)
Note: Bearing case shims are available in 0.10 mm (0.004 in) and 0.20
mm (0.008 inch) thickness.
Note: Differential bearing shims are available in 0.10 mm (0.004 in), 0.20
mm (0.008 in) and 0.40 mm (0.016 in) thickness.
Study the different contact patterns
gear engagement as necessary.
Note: When making changes, note that two variables are involved (see
Pattern Movement Summary (page
Example: If the pinion gear to ring gear backlash is set correctly to
specifications and the bearing case shim is changed to adjust tooth contact,
it may be necessary to readjust backlash to the correct specification before
checking the contact pattern.
Figure 273
3. Differential gear case
4. Differential bearing shims
(Figure 273).
(Figure 274
7–45)).
Page 7–44
(Figure 272).
and Figure 275) and correct
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
Gear