Gorman-Rupp Pumps SF4A-X 1531245 and up - Manual (Page 42)

OM-06629 SF SERIES X‐PROOF PUMPS
PAGE E - 19 MAINTENANCE AND REPAIR
PUMP END DISASSEMBLY
Preparing Pump for Disassembly
Use the hoisting bail to remove the pump from the
wet well or sump, and move it to a suitable location
for disassembly.
If the pump is designed for a guide rail application,
it is not necessary to remove the guide shoe for
most pump maintenance procedures. If removal of
the guide shoe is desired, disengage the hardware
securing the guide shoe to the pump casing and
remove the guide shoe and guide shoe seal.
If the pump is designed for a stand application, dis­
engage the hardware securing the pump to the
stand before proceeding with pump maintenance.
Suction Head and Wear Ring Removal
Position the pump horizontally on a flat work sur­
face and remove the hardware securing the suc­
tion head to the pump casing.
Use a pair of suitable tools to pry the suction head
and assembled wear ring out of the pump casing.
Inspect the wear ring for excessive wear or scoring.
If replacement is required, install two M12 x 1.75 x
76 mm long capscrews (not supplied) in the
tapped holes in the suction head. Turn the screws
evenly in an alternating sequence to press the
wear ring out of the suction head.
Pump Casing Removal
Position the pump assembly on a flat surface and
use the lifting bail and lifting device to support the
pump in a vertical position. Remove the hardware
securing the motor assembly to the pump casing.
Using the lifting device, raise the motor assembly
out of the pump casing. It may be necessary to tap
around the circumference of the pump casing with
a soft‐faced mallet to break the seal between the
casing and motor. When the motor is free of the
pump casing, position the motor and remaining
pump end components horizontally on a flat sur­
face for further disassembly. Chock the pump to
prevent rolling when positioned horizontally.
Remove the O‐ring from the outer shoulder of the
seal plate.
Draining Oil From Seal Cavity
The seal cavity oil must be drained to prevent the
oil from escaping as the impeller is removed.
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
facing up. Clean any dirt from around the plug. Re­
move the plug slowly to release any pressure and
install a short pipe nipple in the hole. Roll the pump
and drain the seal oil into a clean container. In­
spect the oil for water, dirt, or cloudy condition
which could indicate lower seal failure or poor O‐
ring seal.
Impeller Removal
Wedge a soft metal rod between the impeller vanes
to prevent impeller rotation.
NOTE
A strap wrench may also be used to immobilize the
impeller.
Remove the impeller capscrew. A hex key used in
conjunction with an impact wrench can also be
used to remove the impeller screw.
Remove the impeller washer. Remove the metal
rod or strap wrench used to immobilize the im­
peller.
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.
Remove the impeller adjusting shims. Tie and tag
the shims for ease of reassembly.