PN-52886 (4/97)20
Identify the open side of the seal containing the
spring.
Lightly coat, with Permatex, the area of housing
where seals seat.
Install bottom seal with spring up toward center of
housing.
Place seal squarely on housing and select a piece of
pipe or tubing with an OD that will set on outside edge
of seal. A tubing with an OD that is too small will bow
seal cage.
Carefully press seal into housing, preventing distor-
tion to metal seal cage. Bottom seal should seat firmly
and squarely against machined shoulder in housing.
Make sure seal lip did not roll under. Distortion to seal
cage or damage to seal lip will cause seal to leak.
Damaged seals must be replaced.
Carefully press top seal in with spring up. Top seal
should be flush with, to 1/16” above, housing.
Rotate housing on spindle shaft, checking for free
movement.
Install grease fitting in spindle shaft.
RD7200 and RD8400 Spindle
Place bottom bearing cone into spindle with taper
positioned to mate with cup.
IMPORTANT
! Improper positioning of seals can
cause seal damage.
Proper seal installation is important. An improperly
installed seal will leak and could cause bearing
failure.
Identify the open side of the seal containing the
spring.
Lightly coat, with Permatex, the area of housing
where seals seat.
Install bottom seal with spring up toward center of
housing.
Place seal squarely on housing and select a piece of
pipe or tubing with an OD that will set on outside edge
of seal. A tubing with an OD that is too small will bow
seal cage.
Carefully press seal into housing, preventing distor-
tion to metal seal cage. Bottom seal should seat firmly
and squarely against machined shoulder in housing.
Make sure seal lip did not roll under. Distortion to seal
cage or damage to seal lip will cause seal to leak.
Damaged seals must be replaced.
Insert shaft and bearing through bottom of housing.
Fill housing cavity with a medium grade grease.
Install top bearing on shaft to mate with top cone.
Apply a thin coat of Permatex to shaft area where
sleeve will seat.
Install sleeve on shaft and press sleeve and bearing
into housing until all free play is removed and there is
a very light drag on bearings (similar to adjusting front
wheel bearings on an automobile). Check by spinning
spindle. It should turn freely.
Be careful not to overtighten bearings. Proper bearing
adjustment is essential to good bearing life.
Should you overtighten bearings, hold spindle hous-
ing and rap spindle shaft with a lead hammer.
Carefully press top seal in with spring up. Top seal
should be flush with, to 1/16” above, housing.
Rotate housing on spindle shaft, checking for free
movement.
Install grease fitting in spindle shaft.
Spindle Installation
Install spindle through bottom of mower and install
four mounting bolts.
IMPORTANT
! Pulley installation sequence is very
important for bearing life. Follow the se-
quence exactly.
Install pulley and split taper bushing with integral key
on spindle shaft. Make certain bushing is in contact
with sleeve on spindle shaft. Alternately tighten split
taper bushing cap screws to 12 lbs.-ft.
Install toothed lockwasher and nut on spindle shaft.
Tighten nut until snug. Bend up edge of lockwasher
against a flat on nut.
GEARBOX MAINTENANCE
(Figure 18)
Read this entire section before starting any repair.
Many steps are dependent on each other.
Fill gearbox with SAE 80W or 90W gear lube until it
runs out the side level plug (18).
Repair to this gearbox is limited to replacing bearings,
seals and gaskets. Replacing gears, shafts and a
housing is not cost effective. It is more economical to
purchase a complete gearbox if repair other than
replacing bearings, seals or gaskets is required.
Inspect gearbox for leakage and bad bearings.
Leakage is a very serious problem and must be
corrected immediately.
Bearing failure is indicated by excessive noise and
side to side or end play in gear shafts.
(Rev. 2/9/99)
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