OM-06258
S SERIES PUMPS
PAGE E - 9
MAINTENANCE AND REPAIR
damaged.
Remove the seal retaining ring (66) using snap ring
pliers. Use caution when removing the retaining
ring; tension on the seal spring will be released.
Remove the spring retainer and seal spring.
Lubricate the rotor shaft (23) and work oil under the
bellows. Use the hooked ends of two stiff wires to
hook the retainer and pull the rotating portion of the
seal off the shaft.
Slide the hooked ends of two 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).
It is
strongly recommended
that the intermediate
and rotor subassembly be removed from the motor
housing as a single unit to check the bearings for
proper positioning and to force all shaft end‐play in
one direction during pump end reassembly. Re
move the subassembly as described in
Motor Dis
assembly
.
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 (17) 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.
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 (23) 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 (3 or 4) should
be reused because wear patterns on the finished
faces cannot be realigned during reassembly. This
could result in premature failure. If necessary to re
use 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.
