S SERIES PUMPS
OM-07264
MAINTENANCE AND REPAIR
PAGE E - 16
Bearing Installation
(Figure 1)
Inspect the rotor shaft (33) 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 bearings (9 and 55) to a uniform tempera
ture
no higher than
250
_
F (120
_
C). Slide the up
per bearing onto the shaft until it is fully seated
against the shaft shoulder, repeat the same proce
dure for the lower bearing. 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.
After the bearings have been installed and allowed
to cool, check to ensure that they have not moved
out of position in shrinking. If movement has oc
curred, use a suitably sized sleeve and a press to
reposition the bearings. Make certain that they are
seated squarely against the shaft shoulders.
If heating the bearings is not practical, use a suit
ably sized sleeve and an arbor (or hydraulic) press
to install the bearings on the shaft.
When installing the bearings onto the
shaft,
never
press or hit against the outer
race, balls, or ball cage. Press
only
on the
inner race.
Rotor And Intermediate Installation
(Figure 1)
Use
fresh
solvent to clean all gasket and O‐ring
surfaces of the motor housing (11) and intermedi
ate (8), completely removing any old gasket and
cement material. Inspect the sealing surfaces for
burrs, nicks and pits which could cause a poor
seal. Repair or replace as require.
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.
Install the spring washer (15) in the motor housing
bore.
Carefully ease the rotor and assembled bearings
(9 and 55) into the motor housing (11) so that the
upper bearing (55) seats squarely in the motor
housing bearing bore.
Install the intermediate O‐ring (36) and motor
housing gasket (10). Lubricate the I.D. of the inter
mediate bearing bore.
Position the bearing bore of the intermediate (8)
over the lower ball bearing (9) and lower the inter
