Gorman-Rupp Pumps SF4C 1528832 and up - Manual (Page 39)

OM-06511 SF SERIES
PAGE E - 15 MAINTENANCE AND REPAIR
Using two propane heat torches of the type de­
signed to melt ice or burn weeds from sidewalks
and driveways, apply heat quickly and evenly to
the outside of the motor housing; excessive heat is
not required. When the stator begins to move, al­
low the motor housing to drop onto the work sur­
face, and raise the lifting device to continue to pull
the stator out of the motor housing until free.
Take care not to damage the stator end
turns during removal from the motor hous­
ing.
After the stator has been removed, wrap it in clean,
dry rags or other suitable material until reassembly.
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.
MOTOR REASSEMBLY
Do not attempt to rewind the stator. Wind­
ing tolerances and materials are closely
controlled by the manufacturer and any
deviation can cause damage or operating
problems. Replace the stator, or return it to
one of The Gorman‐Rupp Authorized Sub­
mersible Repair Centers or The Gorman‐
Rupp factory, if defective.
NOTE
Reuse of old O‐rings or shaft seal parts will result in
premature leakage or reduce pump performance. It
is strongly recommended that new O‐rings and
shaft seal assemblies be used during reassembly
(see the parts list for numbers).
Stator Installation
(Figure E-2)
NOTE
Stator installation involves heating the motor hous­
ing. This process must be done quickly; therefore it
is recommended that these steps be performed by
at least two people to promote efficient installation
of the stator.
Clean all O‐ring surfaces of the motor housing. In­
spect the sealing surfaces for burrs, nicks and pits
which could cause a poor seal and replace defec­
tive parts as required.
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 and secure it in an inverted
position. Do not unwrap the stator 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.
The O.D. of the stator must be painted with GE
Glyptal insulating paint just prior to being installed
in the motor housing. The paint should still be wet
when the stator is installed.
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