Interference Fit - Hisun HS700UTV-4 Maintenance Handbook

2. When installing a bearing as described in
Step 1, some type of driver is required.
Never strike the bearing directly with a
hammer or it will damage the bearing.
When installing a bearing, use a piece of
pipe or a driver with a diameter that
matches the bearing inner race. Figure 47
Shows the correct way to use a driver and
hammer to install a bearing.
3. 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 48. If the outer race is not supported
as shown, the balls will push against the
outer bearing race and damage it.

Interference fit

1. 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. In this case. Driving
the bearing on the shaft using normal
methods may cause bearing damage.
Instead, heat the bearing before installation.
Note the following:
a. Secure the shaft so it is ready for bearing
installation.
b. Clean all residues from the bearing surface of the shaft. Remove burrs with a file or
sandpaper.
c. Fill a suitable pot or beaker with clean mineral oil. Place a thermometer rated above
120℃(248°F) in the oil. Support the thermometer so it does not rest on the bottom or side
of the pot.
d. Remove the bearing from its wrapper and secure it with a piece of heavy wire bent to hold it
in the pot. Hang the bearing in the pot so it does not touch the bottom or sides of the pot.
e. Turn the heat on and monitor the thermometer. When the oil temperature rises to
approximately 120℃(248°F), remove the bearing from the pot and quickly install it. If
necessary, place a socket on the inner bearing race and tap the bearing into place. As the
GENERAL INFORMATION
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