Gorman-Rupp Pumps SF4A 1488019 and up - Manual (Page 41)

SF SERIES OM-06432
MAINTENANCE AND REPAIR PAGE E - 16
turns. Tape the stator leads 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.
Using two propane heat torches of the type de­
signed to melt ice or burn weeds from sidewalks
and driveways, heat the motor housing enough for
the stator to be installed; when heating the motor
housing, make sure that the stator is clear to avoid
a fire hazard, or damage to the windings. Apply
heat evenly to the outside of the housing; exces­
sive 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 housing opening. Carefully lower the sta­
tor into the motor housing until fully seated against
the housing shoulder. This should be done quickly
to prevent the stator from sticking in the housing
before it is fully seated. Be careful not to damage
the stator lead insulation during reassembly.
After the stator is fully and squarely seated on the
motor housing shoulder, remove the expandable
disc tool. Untape the stator leads.
Cover the motor housing with a clean, lint‐free
cloth while the rotor is being assembled.
Bearing and Rotor Shaft Installation
(Figure E-2)
If the moisture sensor (13) was removed for re­
placement, screw the new sensor into the hole in
the intermediate until fully seated. If removed,
install a new male terminal (15) on the sensor and
position it so the moisture sensor female terminal
(14) can be easily attached.
Inspect the rotor shaft (3) 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.
Slide the snap ring (4) over the shaft with the bev­
eled edge of the snap ring facing the rotor.
Heat the bearings (2 and 5) to a uniform tempera­
ture no higher than 250
_F (120_C). Slide the bear­
ings onto the shaft, one at a time, until they are fully
seated against the shaft shoulders. This should be
done quickly, in one continuous motion, to prevent
the bearings from cooling and sticking on the shaft.
Use caution when handling hot bear­
ings to prevent burns.
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