Gorman-Rupp Pumps 83B52-GX390 1324570 and up - Manual (Page 27)

OM−04738 80 SERIES
MAINTENANCE & REPAIR PAGE E − 9
Install the seal spring and spring centering washer.
Lubricate the seal as indicated in LUBRICATION,
after the impeller has been installed.
Impeller Installation
(Figure 2)
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (48) as previously removed, and screw the
impeller onto the shaft until tight.
A clearance of .010 to .020 inch (0,25 to 0,51 mm)
between the impeller and the intermediate is nec-
essary for maximum pump efficiency. Measure this
clearance and add or remove impeller shims until
this clearance is reached.
Pump Casing Installation
(Figure 2)
If the wear plate (18) was removed, position the re-
placement wear plate assembly squarely against
the casing shoulder and secure it with the mount-
ing hardware (22, 23, 36 and 37). Replace the fiber
washer (23) if badly worn or compressed.
Install the same thickness of pump casing gaskets
(17) as previously removed. Install the same thick-
ness of pump casing gaskets (17) as previoualy re-
moved, and secure the pump casing (1) to the in-
termediate with the nuts (12).
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 (17) 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.
NOTE
An alternate method of adjusting this clearance is to
reach through the discharge port with a feeler
gauge and measure the gap. Add or subtract pump
casing gaskets accordingly.
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.
See Figure 1 and secure the pump casing (1) to the
base (3) with the previously removed hardware
(17, 18 and 19). Be sure to reinstall any leveling
shims used under the mounting feet of the pump
casing.
Suction Check Valve Installation
(Figure 2)
Inspect components of the check valve assembly
(24) and replace as required. If separated at disas-
sembly, assemble the check valve weights (25 and
29) to the check valve gasket (26) with the hard-
ware (27 and 28).
Position the check valve assembly in the suction
port with the large weight (25) facing toward the in-
side of the pump casing. Install the suction flange
(31) and secure with the nuts (33). Check the oper-
ation of the check valve to ensure proper seating
and free movement.
Final Pump Assembly
(Figure 1)
Be sure the pump and engine 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.
Be sure the pump and engine have been properly
lubricated, see LUBRICATION.
Remove the fill plug (8, Figure 2) and fill the pump
casing with clean liquid. Reinstall the fill plug and
tighten it.