S SERIES PUMPS
OM-06258
MAINTENANCE AND REPAIR
PAGE E - 8
Strainer Plate And Suction Head Removal
(Figure E-1)
Remove the hardware (9, 10 and 11) securing the
strainer plate (12) to the intermediate (17). Remove
the strainer plate. Discard the the strainer plate
gasket (14) and the diffuser O‐ring (8). Remove the
nylon locknuts (60) securing the suction head (58)
to the diffuser (1). Pull the suction head off the dif
fuser studs (59). Remove the spacers and adjust
ing shims (6 and 7). For ease of reassembly, tie and
tag the spacer and shims. Remove and discard the
suction head O‐ring (5).
Impeller Removal
(Figure E-1)
Remove the nylon locknuts (55) from the studs
(54).
NOTE
The impeller hub is drilled and tapped with two 3/8
- 16 UNC screw holes for use with an impeller
knocker (not shown) if desired.
Insert a 3/4 inch square X 36 inch long (19,1 mm
square X 914,4 mm long) rod between the vanes of
the impeller (2) and the diffuser studs (54) to pre
vent impeller rotation. Remove the impeller nut (57)
and washer (56). Remove the rod from between
the vanes of the impeller. Screw the impeller knock
er (supplied with the pump) onto the rotor shaft.
NOTE
The rotor shaft is tapered and forms a friction fit with
the impeller. Screw the impeller knocker onto the
shaft until it bottoms out.
Use two pry bars to exert pressure on the back of
the impeller and strike the knocker sharply until the
impeller breaks loose.
Do not
use excessive force when striking
the knocker. It is possible to drive the rotor
and lower ball bearing (39) out of position
during impeller removal. If this occurs, the
motor must be disassembled and the low
er bearing must be pressed back into
place to achieve proper impeller clear
ances (see
Motor Disassembly
and
Mo
tor Reassembly
).
After the impeller is free; remove the impeller
knocker and slide the impeller off the shaft. Use
caution when removing the impeller; tension on
the seal spring will be released. Inspect the impel
ler for wear or damage and replace as required.
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 spring retainer and seal
spring. Lubricate the rotor shaft (23) and work oil
under the bellows assembly. 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 (1) out of the
strainer plate (12). Slide the diffuser (1) off the
shaft. Remove and discard the diffuser gasket (49).
Remove the diffuser O‐ring (8) if not previously re
moved. 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 al
ternate sides of the stationary seat until the station
ary 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 (17) for access to
the upper seal assembly (4).
NOTE
Do not
attempt to loosened the hardware (43, 44,
45, 46 and 47) securing the bearing cap (40) and
the intermediate (17) at this time (see
Motor Disas
sembly
). The rotor shaft and bearings could be
