Gorman-Rupp Pumps 82D3-B 274955 and up - Manual (Page 28)

OM−00806 80 SERIES
MAINTENANCE & REPAIR PAGE E − 9
or impossible without damage to the im-
peller or shaft.
Install the same thickness of impeller shims (4) as
previously removed. Screw the impeller onto the
shaft until tight. Make sure the seal spring seats
squarely over the shoulder on the back of the im-
peller.
The clearance between the back of the impeller
and the seal plate should be between 0.010 and
0.020 inch (0,25 to 0,50 mm). Measure this clear-
ance and add or remove shims from the impeller
adjusting shim set (4) until the correct clearance is
achieved.
Pump Casing and Wear Plate Installation
If the wear plate assembly (20) was removed, posi-
tion the replacement wear plate assembly squarely
against the casing shoulder and secure it with the
hardware (21, 22, 26 and 27). Replace the fiber
washer (37) 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 (19) as previously re-
moved. Secure the pump casing (1) 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 is also rec-
ommended for maximum pump efficiency. Set this
clearance by adding or removing gaskets in the
pump casing gasket set (19) 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.
Secure the pump casing to the base with the pre-
viously removed hardware. Be sure to reinstall any
leveling shims used under the mounting feet of the
pump casing.
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 components of the check valve assembly
(31) and replace as required. If separated at disas-
sembly, assemble the check valve weights (32 and
34) to the check valve gasket (33) with the hard-
ware (35 and 36).
Position the check valve assembly in the suction
port with the large weight (34) facing toward the in-
side of the pump casing. Install the suction flange
(30) and secure with the nuts (29). Check the oper-
ation of the check valve to ensure proper seating
and free movement.
Final Pump Reassembly
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 (38) and tighten it.
Refer to OPERATION, Section C, before putting
the pump back into service.
LUBRICATION
Seal Assembly
The shaft seal is lubricated by the liquid being
pumped and no additional lubrication is required.