Gorman-Rupp Pumps SFV4A 1476537 and up - Manual (Page 39)

OM-06401 SF SERIES
PAGE E - 13 MAINTENANCE AND REPAIR
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.
Rotate the bearings by hand to check for rough­
ness or binding. If rotation is rough, replace the
bearings.
The bearing tolerances provide a tight press fit
onto the shaft and a snug slip fit into the motor
housing and intermediate bearing bores. Replace
the shaft and rotor (as an assembly), the motor
housing or intermediate if the proper bearing fit is
not achieved.
If replacement is required, use a bearing puller to
remove the upper and lower bearings from the ro­
tor shaft.
If no further disassembly is required, cover the mo­
tor housing with a clean, lint free cloth to avoid con­
tamination by dirt or other foreign material.
Stator Removal
(Figure E-2)
Stator replacement requires specialized
equipment, experience with electric mo­
tors, and at least two people to perform the
task. Therefore, it is recommended that
stator replacement be performed only by
the factory or a Gorman‐Rupp Authorized
Submersible Repair Center, or that the mo­
tor housing and stator be replaced as an
assembly (refer to the parts list, page E-5
for the appropriate part number).
Do not remove the stator (not shown) unless it is
defective (open windings, insulation resistance
low, or stator core damaged). If the stator must be
removed, position the motor housing upside down
on a flat work surface.
Position an expandable tool, such as a split disc,
approximately 2 inches (51 mm) down inside the
stator and expand it tightly and squarely on the I.D.
Attach a suitable lifting device to the lifting eye of
the tool, and raise the motor housing and stator as­
sembly approximately 1 inch (25 mm) off the work
surface.
The motor housing must be heated to expand it
enough for the stator to be removed. Using two
propane heat torches of the type designed 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, allow the motor
housing to drop onto the work surface, 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