Toro ProCore SR Series Service Manual page 122

IMPORTANT: Before installing output shaft into
gearbox housing, input shaft bearing pre- -load
must be checked and, if necessary, adjusted.
3. Check and adjust input shaft bearing pre--load:
A. Use a piece of string and a spring scale to deter-
mine the resistance to rotate the input shaft. Wrap
the string around the input shaft and attach the
spring scale to the string end.
B. Once the input shaft is rotating, the resistance to
continue to rotate the shaft should be from 2 to 3 in--
lbs (0.23 to 0.34 N--m). Repeat this process a few
times until a consistent resistance is determined.
C. If rotating resistance is below 2 in--lb (0.23 N--m),
add additional shim(s) behind the spacer on the input
shaft. If resistance is above 3 in--lb (0.34 N--m), re-
move shim(s) from behind the spacer.
D. Retest rotating resistance after adding or remov-
ing shims.
E. Continue shim placement until input shaft rotat-
ing resistance is consistently from 2 to 3 in--lbs (0.23
to 0.34 N--m).
4. Install output shaft assembly into gearbox housing:
A. Press non--gear side bearing cone (item 2) onto
output shaft. Make sure that bearing cone is pressed
fully to shaft shoulder.
B. Position bevel gear (item 21) and gear side bear-
ing cone (item 15) inside gearbox housing. Make
sure that bevel gear teeth mesh properly with gear
on input shaft. Slide output shaft through non--gear
side bearing opening of housing, bevel gear, gear
side bearing cone and then gear side bearing open-
ing of housing.
C. Insert gear side bearing cup (item 15) into bear-
ing bore of gearbox housing.
D. Install the removed shim(s) (item 19) and retain-
ing ring (item 20) into gear side bearing bore. Make
sure that retaining ring is fully seated in housing
groove.
E. Insert non--gear side bearing cup (item 2) into
bearing bore of gearbox housing. Make sure that
bearing is pressed fully to bearing cone on shaft.
F. Install the removed shim(s) (item 19) and retain-
ing ring (item 20) into non--gear side bearing bore.
Make sure that retaining ring is fully seated in hous-
ing groove.
Gearbox Service
5. Check that there is no end play in the output shaft
and that output shaft bearings are not pre--loaded. If out-
put shaft end play is determined, add additional shim(s)
(item 19) as needed. If bearing pre--load (drag) is deter-
mined, remove shim(s).
6. 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 (item 21).
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 19) from non--gear side of gear-
box to the gear side of gearbox. This shim movement
will move bevel gear closer to the input shaft gear to
reduce backlash.
D. If backlash is insufficient (less than 0.010"), move
shim(s) (item 19) from gear side of gearbox to the
non--gear side. This shim movement will move bevel
gear away from the input shaft gear to increase back-
lash.
E. Recheck backlash after any shim change. Re-
peat process until backlash is correct.
7. Apply a light coating of PermatexR No. 2 to mating
surface of cover plate (item 14). Position cover plate to
gearbox housing opening. and secure with eight (8) cap
screws and washers (item 12).
8. Carefully slide axle tube assemblies onto output
shaft ends taking care to not damage seals. Align mark-
er line on housing and axle tube (Fig. 5). Secure axle
tubes to housing with socket head screws (item 16).
9. Apply a light coating of grease on lips and OD of input
seal (item 27). Install seal into gearbox bore taking care
to not damage seal during installation. Seal should be
installed until it is flush to slightly recessed into gearbox
bore.
Page 7 - - 12 ProCore SR Series