OM-07264
S SERIES PUMPS
PAGE E - 15
MAINTENANCE AND REPAIR
result in premature leakage or reduce pump per
formance. It is strongly recommended that new
gaskets and shaft seal assemblies be used during
reassembly (see the parts lists for numbers).
Stator Installation
(Figure 1)
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
two people to promote efficient installation of the
stator.
Clean all gasket and O‐ring surfaces of the motor
housing (11), completely removing any old gasket
and cement material. Inspect the sealing surfaces
for burrs, nicks and pits which could cause a poor
seal, and replace defective 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 with the discharge end
down. Do not unwrap the stator (32) 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 (11) with a torch to expand
it enough for the stator (32) 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
lead 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
upper motor housing shoulder, remove the ex
pandable disc tool. Secure the stator in place by
torquing the setscrew(13) to 13.5 ft. lbs. (162 in.
lbs. or 1,87 m. kg.).
Coat the threads of the pipe plug (12) with `Loctite
Pipe Sealant With Teflon No. 592' or equivalent
sealant, and install the plug over the allen head set
screw. 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.
