Interference Fit - Cub Cadet Challenger Series Service Manual

Interference Fit

Follow this procedure when installing a
bearing over a shaft. When a tight fit is
required, the bearing inside diameter is
smaller than the shaft. Driving the
bearing on the shaft using normal
methods may cause bearing damage.
Instead, heat the bearing before
installation. Be careful not to overheat
the bearing.
Follow this step when installing a
bearing in a housing. Bearings are
generally installed in a housing with a
slight interference fit. Driving the
bearing into the housing using normal
methods may damage the housing or
cause bearing damage. Instead, heat
the housing before the bearing is
installed.
Caution
Before heating the housing in this
procedure, wash the housing
thoroughly with detergent and water.
Rinse and rewash the cases as
required to remove all traces of oil
and other chemical deposits.
Heat the housing to approximately 100
℃ (212°F) in an oven or on a hot
plate
.
Caution
Do not heat the housing with a
propane or acetylene torch. Never
bring a flame into contact with the
bearing or housing. The direct heat
will destroy the case will cause
hardening of the bearing and will
likely warp the housing.
General Information
1‐31
Remove the housing from the oven or
hot plate, and hold onto the housing with
welding gloves. It is hot! Hold the
housing with the bearing side down and
tap the bearing out. Repeat for all
bearings in the housing.
Before heating the bearing housing,
place the new bearing in a freezer if
possible. Chilling a bearing slightly
reduces its outside diameter while the
heated bearing housing assembly is
slightly larger due to heat expansion.
This makes bearing installation easier.
Note
Always install bearings with the
manufacturer's mark or number
facing outward.
While the housing is still hot, install the
new bearing(s) into the housing. Install
the bearings by hand, if possible. If
necessary, lightly tap the bearing(s) into
the housing with a driver placed on the
outer bearing race (Figure 43). Do not
install new bearings by driving on the
inner-bearing race. Install the bearing(s)
until it seats completely.