Gorman-Rupp Pumps 810A2-F6L All serial numbers - Manual (Page 31)

80 SERIES OM−02754
MAINTENANCE & REPAIR PAGE E − 12
or impossible without damage to the im-
peller or shaft.
A clearance of .020 to .040 inch (0,51 to 1,02 mm)
between the impeller and the seal plate is recom-
mended for maximum pump efficiency. Measure
this clearance and add or subtract impeller shims
until it is reached.
NOTE
The seal plate must be tight against the intermedi-
ate while setting the back impeller clearance.
Pump Reassembly
(Figure 2)
If the wear plate (39) was removed for replace-
ment, install the O-ring (38) and secure the re-
placement wear plate to the pump casing with the
hardware (41 and 42).
Remove the two capscrews temporarily securing
the seal plate, and install the same thickness of
pump casing gaskets (12) as previously removed.
Secure the pump casing to the intermediate with
the nuts (14).
A clearance of .010 to .020 inch (0,25 to 0,51 mm)
between the impeller and the wear plate is also rec-
ommended for maximum pump efficiency. This
clearance can be obtained by removing gaskets
from the casing gasket set until the impeller binds
against the wear plate when the shaft is turned. Af-
ter the impeller binds, add .015 inch (0,38 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.
See Figure 1 and reinstall any leveling shims used
under the pump casing mounting feet and secure
the casing to the base (49) with the hardware (50,
51 and 52).
Suction Check Valve Installation
(Figure 2)
Inspect the check valve components and replace
them as required. Subassemble the check valve
weights (50 and 53) and gasket (54) using the at-
taching hardware (51 and 52).
Secure the check valve assembly (49), valve seat
(44), suction flange gasket (45) and suction flange
(48) to the suction port with the nuts (47).
Check the operation of the check valve to ensure
proper seating and free movement.
Final Pump Reassembly
(Figure 1)
Be sure the pump and intermediate are secure to
the engine and the base.
Install the suction and discharge lines and open all
valves. Make certain that all piping connections are
tight, properly supported and secure.
NOTE
If the discharge elbow (8, Figure 2) was removed,
install the hardware (9, Figure 2) on the underside
of the elbow in the pump casing.
Be sure the pump and engine have been properly
lubricated, see LUBRICATION.
Before starting the pump, fill the pump casing with
clean liquid. Reinstall the fill plug and tighten. (see
OPERATION, Section C).
LUBRICATION
Seal Assembly
(Figure 2)
Fill the grease cup (15) through the grease fitting
with No. 2 lithium base grease until grease es-
capes from the relief hole. Turn the grease cup arm
counterclockwise until it is at the top of the stem;
this will release the spring to apply grease to the
seal (see Figure 5).