OM-06111
S SERIES PUMPS
PAGE E - 17
MAINTENANCE AND REPAIR
Bearing Installation
(Figure E-1)
Inspect the rotor shaft (31) for damaged threads,
scoring in the seal area, and a nicked or damaged
keyway. If the bearings were removed, inspect the
bearing areas for scoring or galling. Remove nicks
and burrs with a fine file or emery cloth. Inspect the
rotor area for separated laminations. If the shaft is
bent or damaged, or if the laminations are sepa
rated, replace the shaft and rotor (a single assem
bly).
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 rotor
assembly is removed.
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 upper bearing (30) to a uniform tempera
ture
no higher than
250
F (120
C). Slide the bear
ing onto the shaft until it is fully seated against the
shaft shoulder. This should be done quickly, in one
continuous motion, to prevent the bearing from
cooling and sticking on the shaft.
Use caution when handling hot bear
ings to prevent burns.
If heating the bearing is not practical, use a suitably
sized sleeve, and an arbor (or hydraulic) press to
install 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.
Clean the bearing cap (32) and position it over the
lower bearing (34)
before
heating.
NOTE
Position the cap on the bearing so that when in
stalled on the shaft, the bearing will be positioned
as indicated in Figure E-4.
Heat the lower bearing and cap to a uniform tem
perature
no higher than
250
F (120
C). Slide the
assembled cap and bearing onto the shaft until the
bearing is fully seated against the shaft shoulder.
Do this quickly, in one continuous motion, to pre
vent the bearing from cooling and sticking on the
shaft.
