GENERAL INFORMATION CU800 Service Manual
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3. 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.
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 48). If the outer race is
not supported as shown, the balls will push
against the outer bearing race and damage it.
1.11.9 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
bearing chills, it will tighten on the shaft, so install it quickly. Make sure the bearing is
installed completely.
2. 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. Note the following:
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