OM-06628
SFV & SFEV SERIES X‐PROOF PUMPS
PAGE E - 19
MAINTENANCE AND REPAIR
to disassembly. If sealing was faulty or question
able, the cause must be determined and corrected
before reassembly. Replace any parts as required.
Thoroughly clean all reuseable parts with a soft
cloth soaked in cleaning solvent. Remove all O‐
rings and clean the sealing surfaces.
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.
Inspect the rotor shaft for damaged threads, scor
ing, or nicks. Remove nicks and burrs with a fine
file or hand honing stone to restore original con
tours. If the shaft is bent or severely damaged, the
motor must be replaced.
The shaft seal assembly should not be reused be
cause wear patterns on the finished faces cannot
be realigned during reassembly. This could result
in premature failure.
Handle the seal parts with extreme care to prevent
damage. Be careful not to contaminate the preci
sion finished faces; even fingerprints on the faces
can shorten seal life. If necessary, clean the faces
with a non‐oil based solvent and a clean, lint‐free
tissue. Wipe
lightly
in a circular pattern to avoid
scratching the faces.
Inspect the seal components for wear, scoring,
grooves, and other damage that might cause leak
age. If any components are worn, replace the com
plete seal;
never mix old and new seal parts.
Install the shaft seal as shown in the following illus
tration.
IMPELLER
ROTATING
ELEMENT
SEAL PLATE
STATIONARY
SEAL SEAT
SPRING
BELLOWS AND
RETAINER ASSY
SPRING
RETAINER
SHIM SET
O‐RING
SHAFT SLEEVE
O‐RING (IF
USED)
SHAFT SLEEVE
(IF USED)
Figure E-7. Typical Lower Seal Assembly
The seal assembly is not designed for op
eration at temperatures above 104
_
F
(40
_
C). Do not use at higher operating
temperatures.
Seal Installation (With Shaft Sleeve)
Thoroughly clean the O‐ring surfaces and seal
bore of the seal plate. The seal bore must be free of
burrs and nicks which could damage the seal. In
spect the seal plate for cracks, distortion, or ero
sion and replace it if defective.
