SF SERIES
OM-06511
MAINTENANCE AND REPAIR
PAGE E - 8
Let the pump cool before removing the
seal cavity drain plug. Pressure built up
within a hot pump could cause the oil to
spray out when the plug is removed. Re
move the plug slowly and permit pressure
to vent to atmosphere.
Lay the pump on its side with one of the pipe plugs
(7) facing up. Clean any dirt from around the plug.
Remove the plug slowly to release any pressure
and install a short 3/8‐inch NPT nipple in the hole.
Roll the pump and drain the seal oil into a
clean
container. Inspect the oil for water, dirt, or cloudy
condition which could indicate lower seal failure or
poor O‐ring seal.
Impeller Removal
(Figure E-1)
Wedge a soft metal rod between the impeller vanes
to prevent impeller rotation and use a hex key to re
move the impeller screw (5). Remove the impeller
washer (4) and roll pin (3). Remove the metal rod
from between the vanes of the impeller.
NOTE
An alternate method of removing the impeller screw
is to immobilize the impeller using a strap wrench.
A hex key used in conjunction with an impact
wrench can also be used to remove the impeller
screw.
To remove the impeller, use two thin‐bladed
screwdrivers positioned 180
_
apart to pry on the
back of the impeller and “walk” the impeller off the
shaft. Use increasingly larger screwdrivers (or
wedges) as necessary. After the impeller comes
free of the shaft, retain the impeller key (17, Figure
E-2).
Remove the impeller adjusting shims (30). Tie and
tag the shims for ease of reassembly.
If no further disassembly is required, proceed to
the appropriate areas in
PUMP END REASSEM
BLY
.
Lower Seal Removal
(Figures E-1 and E-3)
Remove the seal spring. Slide the shaft sleeve (28)
and rotating portion of the seal off the shaft as a
unit.
Apply oil to the sleeve and work it up under the rub
ber bellows. Slide the rotating portion of the seal off
the shaft sleeve.
Work a pair of stiff wires with hooked ends between
the rotor shaft and the stationary seat and pull the
stationary seat and O‐ring out of the seal plate (24).
NOTE
An alternate method of removing the stationary ele
ment is to remove the screws (26) securing the seal
plate (24) to the motor assembly (12). Pry the as
sembled seal plate and stationary element off the
shoulder of the intermediate (8, Figure E-2). Re
move the O‐ring (11) and press the stationary ele
ment and seat out of the seal plate from the back
side.
Remove the seal sleeve O‐ring (25) from the rotor
shaft.
If no further disassembly is required, proceed to
the appropriate areas in
PUMP END REASSEM
BLY
.
Upper Seal Removal
(Figures E-2 and E-3)
With the pump end and lower seal removed, se
cure the pump in an inverted position for further
disassembly.
Remove the seal plate (24, Figure E-1) as de
scribed above in
Lower Seal Removal
.
Remove the seal retaining ring (10) using snap ring
pliers. Use caution when removing the retaining
ring; tension on the seal spring will be released.
Remove the spring centering washer and seal
spring.
Lubricate the seal area of the rotor shaft (3) and
work oil up under the bellows. Remove the hard
ware (12 and 13) securing the intermediate (8) to
the motor subassembly (1).
Carefully pull the assembled intermediate, rotor
shaft (3) and bearings (2 and 5) out of the motor
