Gorman-Rupp Pumps S4A1-E25 460/3 1396155 and up - Manual (Page 42)

S SERIES PUMPS OM-06098
MAINTENANCE AND REPAIR PAGE E - 16
Heat the motor housing (16) with a torch to expand
it enough for the stator (39) 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 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.
Install the motor bushing (44). 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 (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 upper bearing (18) 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.
If heating the bearing is not practical, use a suitably
sized sleeve, and an arbor (or hydraulic) press to
install the bearing on the shaft.
When installing the bearing onto the shaft,
never press or hit against the outer race,
balls, or ball cage. Press only on the inner
race.
Clean the bearing cap (44) and position it on the ro­
tor shaft with the gasket surface and screw holes
toward the threaded end of the shaft.
Heat the lower bearing (15) 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.
If heating the bearing is not practical, use a suitably
sized sleeve and an arbor (or hydraulic) press to in­
stall the bearings on the shaft.