OM-06258
S SERIES PUMPS
PAGE E - 17
MAINTENANCE AND REPAIR
tor is clear to avoid a fire hazard, or damage to the
windings. Apply heat evenly to the outside of the
housing; 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. Carefully lower the stator into the
motor housing until fully seated against the hous
ing shoulder. Be careful not to damage the stator
leads insulation during reassembly. If the stator
“cocks” in the motor housing, 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 while the rotor is being assembled.
Bearing Installation
(Figure E-1)
Inspect the rotor shaft (23) for damaged threads,
scoring in the seal area, and a nicked or damaged
tapered end. If the bearings were removed, in
spect the bearing areas for scoring or galling. Re
move 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 separated, replace the shaft and rotor (a single
assembly).
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 (24) 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.
Clean the bearing cap (40) and position it over the
lower bearing (39)
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.
