Gorman-Rupp Pumps SF4C 1528832 and up - Manual (Page 31)

OM-06511 SF SERIES
PAGE E - 7 MAINTENANCE AND REPAIR
Do not attempt to lift the pump by the
motor power cable or the piping. Attach
proper lifting equipment to the lifting
device fitted to the pump. If chains or
cable are wrapped around the pump to
lift it, make certain that they are posi­
tioned so as not to damage the pump,
and so that the load will be balanced.
If installed in a slide rail application, it is not neces­
sary 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 installed in a trash application, it is not necessary
to remove the optional discharge elbow for most
pump maintenance procedures. If removal of the
discharge elbow is desired, disengage the hard­
ware securing the elbow to the pump casing and
remove the elbow and gasket.
If the pump is equipped with a trash stand, disen­
gage the hardware securing the pump to the stan
before proceeding with pump disassembly.
Suction Head and Wear Ring Removal
(Figure E-1)
Position the pump horizontally on a flat work sur­
face and remove the hardware (8 and 9A) securing
the suction head (7) to the pump casing (1).
Use a pair of suitable tools to pry the suction head
and assembled wear ring (5) out of the pump cas­
ing.
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
(Figure E-1)
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
(8 and 12) securing the motor assembly (11) to the
pump casing (1).
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 (23) from the outer shoulder of
the seal plate (22).
Draining Oil From Seal Cavity
(Figure E-2)
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
(7) facing up. Clean any dirt from around the plug.
Remove the plug slowly to release any pressure
and install a short 3/8‐inch NPT nipple in the hole.
Roll the pump and drain the seal oil into a clean
container. Inspect the oil for water, dirt, or cloudy
condition which could indicate lower seal failure or
poor O‐ring seal.
Impeller Removal
(Figure E-1)
Wedge a soft metal rod between the impeller vanes
to prevent impeller rotation and use a hex key to re­