Gorman-Rupp Pumps 14A22-B 1064248 and up - Manual (Page 33)

10 SERIES OM-00661
MAINTENANCE & REPAIR PAGE E - 10
Impeller Installation and Adjustment
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (73) as previously removed. Apply `Never‐
Seez' or equivalent to the shaft threads and screw
the impeller onto the shaft until tight.
A clearance of .020 to .040 inch (0,51 to 1,02 mm)
between the impeller and the seal plate is neces­
sary for maximum pump efficiency. Measure this
clearance and add or remove impeller shims until
this clearance is reached.
NOTE
Be sure the seal plate is tight against the pedestal
while measuring this clearance.
Pump Casing Installation
Remove the hardware temporarily securing the
seal plate to the pedestal. Install the same thick­
ness of pump casing gaskets (43) as previously re­
moved, and secure the pump casing to the seal
plate and pedestal (19) with the nuts (41). Do not
fully tighten the nuts at this time.
NOTE
The back cover assembly must be in place to adjust
the impeller face clearance.
A clearance of .008 to .015 inch (0,20 to 0,38 mm)
between the impeller and the wear plate (46) is also
recommended for maximum pump efficiency. Set
this clearance by adding or removing gaskets in
the pump casing gasket set (34) until the impeller
scrapes against the wear plate when the shaft is
turned by hand. After the impeller binds, add ap­
proximately .008 inch (0,20 mm) of gaskets.
After the face clearance has been set, tighten the
nuts (41) securing the pump casing to the pedes­
tal.
Back Cover Installation
If the wear plate (46) was removed for replace­
ment, secure it to the cover plate (53) using the at­
taching hardware (47 and 48) at this time. The wear
plate must be concentric to prevent binding when
the back cover is installed.
Clean any scales or debris from the contacting sur­
faces on the pump casing that might prevent a
good seal with the back cover. Replace the back
cover gasket (50) and slide the back cover assem­
bly (53) into the pump casing. Be sure the wear
plate does not bind against the impeller.
NOTE
To ease future disassembly, apply a film of grease
or `Never‐Seez' on the back cover shoulder, or any
surface that contacts the pump casing. This action
will reduce rust and scale build‐up.
Secure the back cover assembly by installing the
clamp bar (52) and tightening the clamp bar screw
(51). Do not over‐tighten the clamp bar screw; it
should be just tight enough to seal the back cover
shoulder.
Suction Check Valve Installation
Inspect the check valve components and replace
as required. Subassemble the check valve weights
(64 and 65), check valve gasket (66) and check
valve (63) using the attaching hardware (62 and
63).
Position the check valve assembly (61) in the
check valve seat (70) with the large weight toward
the inside of the pump casing. Install the inner
check valve gasket (71) on the studs (58).
Position the check valve assembly and seat in the
suction port. Install the outer check valve gasket
(69) and suction flange (60). Secure the complete
assembly with the nuts (59). Check the operation
of the check valve to ensure proper seating and
free movement.
Final Pump Assembly
Secure the pump to the base with the previously re­
moved hardware. Be sure to reinstall any leveling
shims used under the pump mounting feet.
Be sure the pump and power source are securely
mounted to the base.
Install the suction and discharge lines and open all
valves. Make certain that all piping connections are