Gorman-Rupp Pumps SFV4A 1476537 and up - Manual (Page 40)

SF SERIES OM-06401
MAINTENANCE AND REPAIR PAGE E - 14
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
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 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 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