Toro ProCore SR Series Service Manual page 118

5. Check gearbox backlash:
IMPORTANT: Correct engagement between bevel
gear and input shaft gear is critical to gearbox per-
formance and durability.
A. Position a dial indicator at the center of a tooth on
the bevel gear.
B. While preventing the input shaft from turning, ro-
tate the bevel gear and monitor the dial indicator
reading to check gearbox backlash. Allowable back-
lash is from 0.010" to 0.012" (0.25 to 0.30 mm).
IMPORTANT: If backlash adjustment is neces-
sary, do not simply remove shims from one side
of output shaft assembly as this would affect
output shaft endplay. Shims must be moved
from one side of the output shaft to the other side
during backlash adjustment.
C. If backlash is excessive (greater than 0.012"),
move shim(s) (item 3) from ball bearing side of gear-
box to the tapered bearing side of gearbox. This shim
movement will move bevel gear closer to the input
shaft gear to reduce backlash.
Gearbox Service
D. If backlash is insufficient (less than 0.010"), move
shim(s) (item 3) from tapered bearing side of gear-
box to the ball bearing side of gearbox. This shim
movement will move bevel gear away from the input
shaft gear to increase backlash.
E. Recheck backlash after any shim change. Re-
peat process until backlash is correct.
6. Apply light coating of PermatexR No. 2 to sealing
surface of cover plate (item 12). Use a soft face hammer
to drive cover plate into housing.
7. Apply a light coating of grease on lips and OD of
three (3) gearbox seals (item 1). Install seals into gear-
box bores taking care to not damage seals during instal-
lation. Seals should be installed until they are flush to
slightly recessed into gearbox bores.
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