Gorman-Rupp Pumps SF4A 1488019 and up - Manual (Page 33)

SF SERIES OM-06432
MAINTENANCE AND REPAIR PAGE E - 8
move the impeller screw (4). Remove the impeller
washer (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 screw­
drivers 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 (16, Figure E-2).
Remove the impeller adjusting shims (28). 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 spring retainer (27) and seal
spring. Slide the shaft sleeve (18) and rotating por­
tion 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 (15).
NOTE
An alternate method of removing the stationary ele­
ment is to remove the screws (23) securing the seal
plate (21) to the motor assembly (14). Pry the as­
sembled seal plate and stationary element off the
shoulder of the intermediate (8, Figure E-2). Re­
move the O‐ring (10) and press the stationary ele­
ment and seat out of the seal plate from the back
side.
Remove the seal sleeve O‐ring (24) from the rotor
shaft.
If no further disassembly is required, proceed to
the appropriate areas in PUMP END REASSEMB­
LY.
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 (21, 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 (11 and 12) 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
housing until the female terminal (14) can be ac­
cessed. Pull the female terminal off the male termi­
nal (15) and remove the intermediate, rotor shaft
and bearings from the motor assembly. Remove
the O‐ring (6) from the intermediate shoulder.
Remove the snap ring (4) from the groove in the in­
termediate and pull the assembled rotor shaft and
bearings out of the intermediate. Cover the motor
assembly with a clean rag to prevent foreign mate­
rial from entering the motor cavity.
With the rotor shaft and bearings removed, press
the stationary seal element and O‐ring out of the in­
termediate from the back side.
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 pump end components at this time.