Gorman-Rupp Pumps 11 1/2A3-B 348418 and up - Manual (Page 33)

10 SERIES OM-00565
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 (25) and pedestal (24) 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 (26) until the impeller
scrapes against the wear plate when the shaft is
turned. After the impeller scrapes, add approxi­
mately .008 inch (0,20 mm) of gaskets.
After the face clearance has been set, tighten the
nuts (11) securing the pump casing to the pedes­
tal.
Back Cover Installation
If the wear plate (27) was removed for replace­
ment, secure the new wear plate to the back cover
plate (33) using the attaching hardware (28 and 29)
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 (31) and slide the back cover assem­
bly 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 components of the check valve assembly
(39) and replace as required. If separated at disas­
sembly, assemble the check valve weights (42 and
44) to the check valve gasket (43) with the hard­
ware (40 and 41).
Position the check valve assembly in the suction
port with the large weight toward the inside of the
pump casing. Install the suction flange (38) and se­
cure with the nuts (37). 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. Connect the power source. 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
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.