sulting from friction. Because bearings are preci-
sion parts, they must be properly lubricated and
maintained. If a bearing is damaged, replace it im-
mediately. When installing a new bearing, take care
to prevent damaging it. Bearing replacement proce-
dures are included in the individual chapters where
applicable; however, use the following sections as a
guideline.
NOTE
Unless otherwise specified, install
bearings with the manufacturer’s
mark or number facing out.
Removal
While bearings are normally removed only when
damaged, there may be times when a good bearing
must be removed. Improper bearing removal will
damage the bearing and maybe the shaft or case
half. Note the following when removing bearings:
1. When using a puller to remove a bearing from a
shaft, take care that shaft is not damaged. Always
place a piece of metal between the end of the shaft
and the puller screw. In addition, place the puller
arms next to the inner bearing race. See
Figure 44
.
2. When using a hammer to remove a bearing from
a shaft, do not strike the hammer directly against the
shaft. Instead, use a brass or aluminum spacer be-
tween the hammer and shaft (
Figure 45
) and make
sure to support both bearing races with wooden
blocks as shown.
3. A hydraulic press is the ideal tool for bearing re-
moval. Note the following when using a press:
a. Always support the inner and outer bearing
races with a suitable size wooden or alumi-
num ring (
Figure 46
). If only the outer race is
supported, pressure applied against the balls
and/or the inner race will damage them.
b. Always make sure the press arm (
Figure 46
)
aligns with the center of the shaft. If the arm is
not centered, it may damage the bearing
and/or shaft.
c. The moment the shaft is free of the bearing, it
will drop to the floor. Secure or hold the shaft
to prevent it from falling.
Installation
1. When installing a bearing into a housing, apply
pressure to the
outer
bearing race (
Figure 47
).
GENERAL INFORMATION
23
1
43
44
Spacer
Shaft
Bearing
Bearing puller
45
Spacer
Shaft
Bearing
Blocks