Gorman-Rupp Pumps SE1 1/2A3 115V 1P 1483930 and up - Manual (Page 36)

OM−06488 SE SERIES
MAINTENANCE AND REPAIR PAGE E − 12
the lifting eye of the tool, and carefully lift the as-
sembly. 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 (10) 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
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 and switch actuator 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 electrical leads.
Cover the motor housing with a clean, lint-free
cloth while the rotor is being assembled.
Switch Actuator Installation
Inspect the rotor shaft (50) 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).
Using a sleeve with an I.D. a little larger than the
O.D. of the shaft, press the switch actuator onto the
shaft. The actuator flange sits just flush with the
snap ring groove. The lower side should align with
the previously scribed mark on the shaft. Secure
the switch actuator to the shaft using the snap ring.
Bearing Installation
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 (44 and 55) to a uniform tem-
perature no higher than 250
_F (120_C). Slide the
bearings onto the shaft one at a time until they are
fully seated against the shaft shoulder. This should
be done quickly, in one continuous motion, to pre-
vent the bearings from cooling and sticking on the
shaft.
Use caution when handling hot bearings 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.