S SERIES PUMPS
OM-06111
MAINTENANCE AND REPAIR
PAGE E - 8
Impeller Removal
(Figure E-1)
Wedge a block of wood between the vanes of the
impeller (14) and the diffuser studs (40) to prevent
impeller rotation. Remove the impeller nut (12) and
washer (13). Remove the wood block from be
tween the vanes of the impeller.
Install the impeller puller (supplied with the pump)
and pull the impeller from the rotor shaft. Use cau
tion when removing the impeller; tension on the
seal spring will be released. Retain the impeller key
(29). Inspect the impeller for wear or damage and
replace as required.
Remove the impeller adjusting shims (15) and the
upper impeller washer (16). Tie and tag the shims
for ease of reassembly.
If no further disassembly is required, proceed to
the appropriate areas in
PUMP END REASSEMB
LY
.
Lower Seal Removal
(Figures E-1 and E-3)
Carefully remove the seal spring. Lubricate the ro
tor shaft (31) and work oil under the bellows as
sembly. Use the hooked ends of two stiff wires to
hook the retainer and pull the rotating portion of the
seal off the shaft.
To remove the stationary portion of the seal, use a
pair of screwdrivers to pry the diffuser (19) out of
the intermediate (27). Slide the diffuser off the
shaft. Remove and discard the diffuser gasket (24).
Place a
clean
cloth on a flat surface and place the
diffuser on the cloth with the impeller side down.
Use a drift pin or screwdriver to press on alternate
sides of the stationary seat until the stationary seat
and O‐rings are removed.
If no further disassembly is required, proceed to
the appropriate areas in
PUMP END REASSEMB
LY
.
Upper Seal Removal
(Figures E-1 and E-3)
Unless cracked or otherwise worn, it is not neces
sary to remove the intermediate (27) for access to
the upper seal assembly (22).
NOTE
Do not
attempt to loosen the hardware (25and 26)
securing the bearing cap (32) to the intermediate
(27) at this time (see
MOTOR DISASSEMBLY
). The
rotor shaft and bearings could be damaged.
Remove the seal retaining ring (21) 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 (31) and work oil up 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 list 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 (27) or
