Toro Groundsmaster 300 Series Service Manual page 211

Ring and Pinion Set
Rings gears and pinions are supplied in matched sets
only. Matching numbers are etched on both the pinion
and ring gear (Fig. 37).
The mounting distance from the bottom of the differen-
tial bearing bores to the button end of the pinion is
1.210 in.
On the button end of each pinion there is a plus (+) or
minus (–) number, or a (0) number. This number indi-
cates the best running position for each particular gear
set. This dimension is controlled by the shimming be-
hind the inner bearing cup.
For example, if a pinion is etched +3, this pinion would
require 0.003 in. less than a pinion etched "0". This
Figure 37
means that by removing shims, the mounting distance
of the pinion is increased to 1.213 in., which is just what
+3 indicates. Or if a pinion is etched –3, we would want
to add 0.003 in. shims, the mounting distance of the the
pinion was decreased to 1.207 in., which is just what a
–3 etching indicates.
If a new gear set is being used, notice the (+) or (–)
etching on both the old and new pinion and adjust the
thickness of the new shim pack to compensate for the
difference of these two numbers.
For example: If the old pinion reads +2 and the new
pinion is –2, add .004 in. shims to the original shim pack.
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Groundsmaster 300 Series Page 7 - 15 Repairs