OM-07207
SUPER T SERIES
MAINTENANCE & REPAIR
PAGE E - 15
Clean the bearings thoroughly in
fresh
cleaning
solvent. Dry the bearings with filtered compressed
air and coat with light oil.
Bearings must be kept free of all dirt and
foreign material. Failure to do so will great
ly shorten bearing life.
Do not
spin dry
bearings. This may scratch the balls or
races and cause premature bearing fail
ure.
Rotate the bearings by hand to check for rough
ness or binding and inspect the bearing balls. If ro
tation is rough or the bearing balls are discolored,
replace the bearings.
The bearing tolerances provide a tight press fit on
to the shaft and a snug slip fit into the bearing hous
ing. Replace the bearings, shaft, or bearing hous
ing if the proper bearing fit is not achieved.
If bearing replacement is required, remove the out
board bearing snap ring (20) and use a bearing
puller to remove the bearings from the shaft.
Shaft and Bearing Reassembly and Installation
(Figure 4)
Clean the bearing housing, shaft and all compo
nent parts (except the bearings) with a soft cloth
soaked in cleaning solvent. Inspect the parts for
wear or damage as necessary.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain
ers.
Inspect the shaft for distortion, nicks or scratches,
or for thread damage on the impeller end. Dress
small nicks and burrs with a fine file or emery cloth.
Replace the shaft if defective.
Position the inboard oil seal (4) in the bearing hous
ing bore with the lip positioned as shown in Figure
4. Press the oil seal into the housing until the face is
just flush
with the machined surface on the inside
of the housing.
To prevent damage during removal from
the shaft, it is recommended that bearings
be cleaned and inspected
in place
. It is
strongly
recommended that the bearings
be replaced
any
time the shaft and bear
ings are removed.
NOTE
Position the inboard bearing (13) on the shaft with
the shielded side toward the impeller end of the
shaft. Position the outboard bearing (19) on the
shaft with the integral retaining ring on the bearing
O.D. toward the drive end of the shaft.
The bearings may be heated to ease installation.
An induction heater, hot oil bath, electric oven, or
hot plate may be used to heat the bearings. Bear
ings should
never
be heated with a direct flame or
directly on a hot plate.
NOTE
If a hot oil bath is used to heat the bearings, both the
oil and the container must be
absolutely
clean. If
the oil has been previously used, it must be
thor
oughly
filtered.
Heat the bearings to a uniform temperature
no
higher than
250
_
F (120
_
C) and slide the bearings
onto the shaft, one at a time, until they are fully
seated. This should be done quickly, in one contin
uous motion, to prevent the bearings from cooling
and sticking on the shaft.
After the bearings have been installed and allowed
to cool, check to ensure that they have not moved
away from the shaft shoulders in shrinking. If
movement has occurred, use a suitably sized
sleeve and a press to reposition the bearings
against the shaft shoulders.
