S SERIES PUMPS
OM-07089
MAINTENANCE AND REPAIR
PAGE E - 12
Lubricate the rotor shaft (40) and work oil under the
bellows. Position a screwdriver or other suitable
device on each side of the bellows retaining flange,
and pry the bellows upward until the rotating por
tion is off the shaft.
Remove the flat head screws (32) and retaining
ring (33). Slide the hooked ends of two stiff wires
along the shaft and under the stationary seal seat.
Hook the back side of the seat and pull it from the
intermediate bore.
If no further disassembly is required, proceed to
the appropriate areas in
PUMP END REASSEMB
LY
.
NOTE
Do not disassemble the motor unless it is neces
sary and a clean, well‐equipped shop is available. If
the motor housing components are to be serviced,
see
MOTOR DISASSEMBLY
in this section. Do not
reassemble the end components at this time.
PUMP END REASSEMBLY
NOTE
Reuse of old O‐rings, gaskets, or shaft seal parts
will result in premature leakage or reduced pump
performance. It is strongly recommended that new
gaskets and shaft seal assemblies be used during
reassembly (see the parts lists for numbers).
Cleaning And Inspection Of Pump Parts
(Figure E-1)
With the pump inverted, stuff a clean tissue into the
stationary seal seat bore of the intermediate (47) or
wrap a small rag around the shaft to prevent for
eign material from entering the motor cavity.
Carefully inspect any O‐rings or gaskets before re
moval and cleaning to determine if a proper seal
and compression existed prior to disassembly. If
sealing was faulty or questionable, 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 gaskets, and clean the sealing surfaces
of dirt or gasket material. Be careful not to scratch
gasket surfaces. Use a clean cloth lightly damp
ened with solvent to clean the motor housing,suc
tion head, diffuser and seal plate.
Do not
allow the
solvent to enter the motor.
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 (40) for damaged threads,
scoring, or nicks. Remove nicks and burrs with a
fine file or hand honing stone to restore original
contours. If the shaft is bent or severely damaged,
the rotor and shaft must be replaced as an assem
bly (see
MOTOR DISASSEMBLY
).
Neither of the shaft seal assemblies (30 and 50)
should be reused because wear patterns on the
finished faces cannot be realigned during reas
sembly. This could result in premature failure. If
necessary to reuse an old seal in an
emergency
,
carefully
wash all metallic parts in fresh cleaning
solvent and allow to dry thoroughly.
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 seals as illustrated in Figure E-6.
