Gorman-Rupp Pumps 81 1/2B52-B 1240557 and up - Manual (Page 28)

OM−01525 80 SERIES
MAINTENANCE & REPAIR PAGE E − 9
NOTE
Be sure the seal plate is tight against the pedestal
while measuring this clearance.
Pump Casing and Wear Plate Installation
If the wear plate (21) was removed for replace-
ment, secure the new wear plate to the pump cas-
ing (1) using the attaching hardware (23, 24, 35
and 36). Replace the fiber washer (28) if badly worn
or compressed.
Remove the hardware temporarily securing the
seal plate to the pedestal. Install the same thick-
ness of pump casing gaskets (20) as previously re-
moved, and secure the pump casing to the seal
plate and pedestal with the nuts (18). Do not fully
tighten the nuts at this time.
A clearance of .008 to .015 inch (0,20 to 0,38 mm)
between the impeller and the wear plate (21) 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.
If a lifting eye was used to move the pump casing,
be sure to remove the lifting eye from the pump
casing.
Do not attempt to lift the complete pump
unit using the lifting eye. It is designed
to facilitate removal or installation of in-
dividual components only. Additional
weight may result in damage to the
pump or failure of the eye bolt.
Suction Check Valve Installation
Inspect the check valve components and replace
as required. Subassemble the check valve weights
(29 and 31) and check valve (30) using the attach-
ing hardware (27 and 28).
Position the check valve assembly (26) over the
studs (32) with the large weight toward the inside of
the pump casing. Install the suction flange (25) and
secure the flange and check valve with the nuts
(33). 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 (38) 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
Bearings
The pedestal was fully lubricated when shipped
from the factory. Under normal conditions, remove
the vented plug (8) and add one shot of No. 0 lithi-
um base grease from a grease gun after each 250
hours of operation or once each month, whichever
comes first. Do not over lubricate. Over lubrication
can cause the bearings to over heat, resulting in
premature bearing failure.
There are no provisions in the bearing cavity to
drain or flush the lubricant. The pump and pedestal
must be disassembled to completely clean and
maintain this cavity.
Under normal conditions, change the grease after
each 5000 hours of operation, or at 12 month inter-
vals, whichever comes first. Change the grease
more frequently if the pump is operated continu-