Gorman-Rupp Pumps S8B1-E100 460/3 1432260 and up - Manual (Page 42)

S SERIES PUMPS OM-06259
MAINTENANCE AND REPAIR PAGE E - 16
Thoroughly clean the inside of the motor housing
with fresh solvent. The interior must be dry and free
of dirt or lint.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven­
tilated area; free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain­
ers.
After the motor housing is thoroughly cleaned, po­
sition it on a flat surface with the discharge end
down. Do not unwrap the stator (40) until the motor
housing has been prepared for stator installation.
The stator must be kept clean and dry. When han­
dling the stator, do not set it on the end windings;
lay it on its side and block it from rolling.
Test the new stator as indicated in Electrical Test­
ing in TROUBLESHOOTING, Section D, to ensure
that no damage has occurred during transit or han­
dling.
NOTE
Remove any drops of varnish from the ends of the
stator before installation to ensure proper stack‐up
height when assembled.
Position an expandable tool, such as a split disc,
approximately 2 inches (51 mm) down inside the
stator (opposite the lead wire end), and expand it
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 with a torch to expand it
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 wind­
ings. Apply heat evenly to the outside of the hous­
ing; excessive heat is not required.
When the motor housing is sufficiently heated, po­
sition the stator so that slot in the stator aligns with
the plate on the inside of the motor housing and so
that the leads are in line with the terminal opening.
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 reassembly. If the stator “cocks” in the mo­
tor housing, remove it and try again.
After the stator is fully and squarely seated against
the motor housing shoulder, remove the expand­
able 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 (39) 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.