PA SERIES PUMPS
MR--04835
MAINTENANCE & REPAIR
PAGE C -- 12
Shaft and Bearing Reassembly and Installation
(Figure C--2)
Clean and inspect the bearing as indicated in
Shaft and Bearing Removal and Disassembly
.
To prevent damage during removal from
the shaft, it is recommended that the bear-
ing be cleaned and inspected
in place
. It
is
strongly
recommended that the bearing
be replaced
any
time the shaft and bearing
are removed.
Inspect the shaft for distortion, nicks or scratches
or thread damage on the impeller end. Dress small
nicks and burrs with a fine file or emery cloth. Re-
place the shaft if defective.
The bearing may be heated to ease installation. An
induction heater, hot oil bath, electric oven, or hot
plate may be used to heat the bearing. The bearing
should
never
be heated with a direct flame or di-
rectly on a hot plate.
NOTE
If a hot oil bath is used to heat the bearing, both the
oil and the container must be
absolutely
clean. If
the oil has been previously used, it must be
thor-
oughly
filtered.
If removed, install the bearing retaining ring (29) in
the groove in the shaft.
Heat the bearing to a uniform temperature
no
higher than
250
_
F (120
_
C), and slide the it onto
the shaft until fully seated against the retaining
ring. This should be done quickly, in one continu-
ous motion, to prevent the bearings from cooling
and sticking on the shaft.
Use caution when handling hot bear-
ings to prevent burns.
NOTE
Position the bearing on the shaft as indicated by the
following illustrations.
INSTALLATION OF NEW DEPARTURE OR
BCA/FEDERAL MOGAL 5300W SERIES BEARINGS
(OPEN OR ENCLOSED IMPELLERS)
INSTALLATION OF MRC/SKF 5300M OR
FAFNIR 5300W SERIES BEARINGS
(OPEN OR ENCLOSED IMPELLERS)
LOADING
DIRECTION OF
THRUST
BALL LOADING
GROOVE POSITIONED
AWAY FROM IMPELLER
GROOVE
DIRECTION OF
THRUST
LOADING
BALL LOADING
GROOVE POSITIONED
TOWARD IMPELLER
GROOVE
Figure C---4. Bearing Installation
After the bearing has been installed and allowed to
cool, check to ensure that it has not moved out of
position in shrinking. If movement has occurred,
use a suitably sized sleeve and a press to reposi-
tion the bearing.
If heating the bearing is not practical, use a suitably
sized sleeve and an arbor (or hydraulic) press to in-
stall the bearing on the shaft.
When installing the bearing onto the shaft,
never
press or hit against the outer race,
balls, or ball cage. Press
only
on the inner
race.
