Gorman-Rupp Pumps S8B1-E100 460/3 1432260 and up - Manual (Page 34)

S SERIES PUMPS OM-06259
MAINTENANCE AND REPAIR PAGE E - 8
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 (47) 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 excessive 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 (39) and work oil
under the bellows assembly. Slide the rotating por­
tion of the seal assembly (consisting of the bellows,
retainer and rotating element) off the shaft.
To remove the stationary portion of the seal, re­
move the socket head capscrews (51) and sepa­
rate the seal plate (49) from the intermediate (48).
Remove and discard the seal plate O‐ring (8).
Place a clean cloth on a flat surface and place the
seal plate 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.
Inspect the wear ring (65) for excessive wear or
scoring and replace as required. The wear ring is a
press fit into the seal plate. To remove the wear
ring, drill two small holes horizontally through the
ring 180
_ apart. Use a small chisel or mechanical
cutting device to complete the cuts through the
wear ring.
Use caution not to damage the seal plate
when removing the wear ring.
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 for access to the
upper seal assembly (4).
NOTE
Do not attempt to loosen the hardware (12, 13, 45
and 46) securing the bearing cap (17) and the inter­
mediate at this time. The rotor shaft and bearings
could be damaged
Remove the seal retaining ring (35) 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 and work oil under the bel­
lows. Slide the rotating portion of the seal assem­
bly (consisting of the bellows, retainer and rotating
element) off the shaft.
To remove the stationary portion of the seal, 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 pump end components at this time.