General Information
1-33
4. Step 1 describes how to install a
bearing in a case half or over a shaft
However, when installing a bearing
over a shaft and into the housing at
the same time; a tight fit is required
for both outer and inner bearing
races. In this situation, install a
spacer underneath the driver tool so
that pressure is applied evenly
across both races. See (Figure 46).
If the outer race is not supported as
shown, the balls will push against the
outer bearing race and damage it.
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
general 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.
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
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