Polaris PB4SQ Replacement Instructions Manual page 9

Replacement Kit Instructions
• Allow all water to drain from the pump in a suitable location before proceeding.
NOTE: A small amount of water may remain captured inside the impeller stack.
2. Remove the pump wet end.
If possible set the pump vertically on an appropriate work surface.
b
c Using a 9/16" socket or wrench remove the 4 retaining screws and washers
securing the pump housing to the pump motor body.
Pull the pump housing away form the motor body.
d
3. Remove the impeller stack.
a Remove and inspect the orange first stage diffuser O-ring. Damaged or degraded
O-rings must be replaced before returning the pump to normal operation.
Insert a standard 1/4" hex key (Allen Wrench) into the motor shaft through the
b
center of the fan cover mesh. The hex key will be used to hold the motor shaft in
place while removing the motor shaft locking nut.
c While holding the motor shaft, use an 11/16" socket or wrench remove the 3/8" motor
shaft locking nut (right handed thread) along with the split washer and flat washer.
Pull each of the four impeller stages off the central motor shaft. Inspect each
d
impeller stage for corrosion and debris and clean where applicable. If any of the
impeller stages show signs of wear or damage the stage needs to be
replaced before returning the pump
to normal operation.
Flat Washer
Split Washer
(R0723100), (R0734400)
(R0722800), (R0734400)
d
c
3/8" Lock Nut
1st Stage O-ring
Page 9
b
Use 1/4"
Hex Key
Impeller
Stage
a