Gorman-Rupp Pumps 11 1/2A52-B 348418 thru 1241126 - Manual (Page 33)

OM-00615 10 SERIES
MAINTENANCE & REPAIR PAGE E - 10
Pump Casing Installation
Remove the hardware temporarily securing the
seal plate to the pedestal. Install the same thick­
ness of pump casing gaskets (26) as previously re­
moved, and secure the pump casing (1) to the seal
plate and pedestal with the nuts (11). 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 (27) is also
recommended for maximum pump efficiency. Set
this clearance by adding or removing gaskets in
the pump casing gasket set until the impeller
scrapes against the wear plate when the shaft is
turned by hand. After the impeller scrapes, add ap­
proximately .008 inch (0,20 mm) of gaskets.
After the face clearance has been set, fully tighten
the nuts securing the pump casing to the pedestal.
Back Cover Installation
If the wear plate (27) was removed for replace­
ment, secure the new wear plate to the cover plate
(33) using the attaching hardware (28 and 29). The
wear plate must be concentric to prevent binding
when the back cover is installed.
Clean any scale or debris from the contacting sur­
face on the pump casing that might prevent a good
seal with the back cover. Replace the back cover
gasket (31) and slide the back cover assembly 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 (35) and tightening the clamp bar screw
(32). 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
(42 and 44) and check valve (43) using the attach­
ing hardware (40 and 41).
Position the check valve assembly (39) over the
studs (36) with the large weight toward the inside of
the pump casing. Instal the suction flange (38) and
secure the flange and check valve with the nuts
(37). Check the operation of the check valve to en­
sure 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.
Connect the power source. 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
tight, properly supported and secure. Open all the
valves in the suction and discharge lines.
Be sure the pump and power source have been
properly lubricated, see LUBRICATION.
Remove the fill plug assembly (5) and fill the pump
casing with clean liquid. Reinstall the fill plug and
tighten it.
Refer to OPERATION, Section C, before putting
the pump back into service.
LUBRICATION
Seal Assembly
The seal assembly is lubricated by the medium be­
ing pumped. No additional lubrication is required.