Gorman-Rupp Pumps S8A1-E95 575/3 1429751 and up - Manual (Page 34)

S SERIES PUMPS OM-06258
MAINTENANCE AND REPAIR PAGE E - 8
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
damaged.
Remove the seal retaining ring (66) 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 (23) and work oil 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