S SERIES PUMPS
OM-07089
MAINTENANCE AND REPAIR
PAGE E - 20
tightly and squarely on the I.D. Attach a lifting de
vice to the lifting eye of the tool, and carefully lift the
assembly. Take care not to damage the stator end
turns. Slip a sleeve over the stator leads, or tape
them together to protect them during installation.
NOTE
Stator installation involves heating the motor hous
ing. This process must be done quickly to allow the
stator to slide into the motor housing before the
housing cools.
Heat the motor housing (70) with a torch to expand
it enough for the stator (53) to be installed. When
heating the motor housing,
make sure
that the sta
tor is clear to avoid a fire hazard, or damage to the
windings. Apply heat evenly to the outside of the
housings; excessive heat is not required.
When the motor housing is sufficiently heated, po
sition the stator so that the leads are in line with the
terminal opening. Install the key (73), and carefully
lower the stator into the motor housing until fully
seated against the housing shoulder. Be careful
not to damage the stator lead insulation during re
assembly. If the stator “cocks” in the motor hous
ing, remove it and try again.
After the stator is fully and squarely seated on the
motor housing shoulder, remove the expandable
disc tool. Untape or remove the protective sleeve
from the stator leads.
Cover the motor housing with a clean, lint‐free
cloth to prevent contamination while the rotor is be
ing assembled.
Bearing Installation
(Figure E-2)
Inspect the rotor shaft (40) 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 (41 and 46) to a uniform tem
perature
no higher than
250
F (120
C). When in
stalling bearings, slide them onto the shaft until ful
ly seated. This should be done quickly, in one con
tinuous motion, to prevent bearings from cooling
and sticking on the shaft.
Use caution when handling hot bear
ings to prevent burns.
Slide the upper bearing (41) onto the shaft until ful
ly seated.
The bearing
must
be installed as indicated
in the instructions accompanying the bear
ing or as shown in Figure E-6. Improper
installation can cause premature bearing
failure and/or damage to the pump or mo
tor.
Press the oil seal (43) into the bearing cap (44) with
the lip positioned as shown in Figure E-2. Apply
“Loctite Compound RC/609” or equivalent com
