Gorman-Rupp Pumps 86A52-B 1329204 and up - Manual (Page 31)

OM−00941 80 SERIES
MAINTENANCE & REPAIR PAGE E − 10
After the back clearance is set, secure the impeller
with the hardware (41, 42 and 43).
Pump Casing Installation
If the wear plate assembly (44) was removed, posi-
tion the replacement wear plate assembly squarely
against the casing shoulder and secure it with the
mounting hardware (46 and 47).
Install the same thickness of pump casing gaskets
(13) as previously removed. Slide the pump casing
(1) over impeller and secure it to the seal plate and
pedestal with the nuts (40).
A clearance of .008 to .015 inch (0,20 to 0,38 mm)
between the impeller and the wear plate is also rec-
ommended for maximum pump efficiency. Set this
clearance by adding or removing gaskets in the
pump casing gasket set (13) 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.
NOTE
An alternate method of adjusting this clearance is to
reach through the discharge port and measure the
clearance with a feeler gauge. Add or subtract
pump casing gaskets until the proper impeller
clearance is attained.
Secure the pedestal to the base with the previously
removed hardware. Be sure to reinstall any leveling
shims used under the pedestal feet.
Suction Check Valve Installation
(Figure 1)
Inspect the check valve components and replace
them as required. Subassemble the check valve
weights (57 and 58) and gasket (59) using the at-
taching hardware (55 and 56).
Install the check valve assembly in the valve seat
(50). Replace the seat gasket (49), and secure the
valve seat to the suction port using the round head
machine screws (53). Replace the suction flange
gasket (61), and secure the suction flange (60) to
the seat with the nuts (52).
Check the operation of the check valve to ensure
proper seating and free movement.
Final Pump Assembly
Be sure the pump and power source are securely
mounted to the base. Reconnect the power source
to the pump.
Install the suction and discharge lines and open all
valves. Make certain that all piping connections are
tight, properly supported and secure.
If a lifting eye was used to move the pump casing,
be sure to remove the lifting eye from the pump
casing.
Be sure the pump and power source have been
properly lubricated, see LUBRICATION.
Fill the pump casing with clean liquid. Reinstall the
fill plug (8) 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, and no additional lubrication is re-
quired.
Bearings
The pedestal was fully lubricated when shipped
from the factory. Check the oil level regularly
through the sight gauge (33) and maintain it at the
middle of the gauge. When lubrication is required,
add SAE No. 30 non-detergent oil through the hole
for the air vent (20). Do not over-lubricate. Over-lu-
brication can cause the bearings to over-heat, re-
sulting in premature bearing failure.
NOTE
The white reflector in the sight gauge must be posi-
tioned horizontally to provide proper drainage.
Under normal conditions, change the oil each
5000 hours or once each year, more frequently if
the pump is operated continuously or installed in
an environment with rapid temperature change.