Gorman-Rupp Pumps 82H52-B 252751 thru 1325647 - Manual (Page 28)

OM−00836 80 SERIES
MAINTENANCE & REPAIR PAGE E − 9
This seal is not designed for operation at
temperatures above 160
_F (71_C). Do not
use at higher operating temperatures.
Position the seal plate (27) on a flat surface with the
impeller side facing up. Apply oil to the stationary
seat O-ring and use thumb pressure to press the
stationary seat into the seal plate bore until fully
seated. A push tube made from a piece of plastic
pipe would aid this installation. The I.D. of the tube
should be approximately the same as the I.D. of the
seal spring.
Carefully slide the assembled seal plate and sta-
tionary seat over the impeller shaft (16) until the
seal plate seats against the pedestal (14). Use cau-
tion not to damage the seal stationary element on
the shaft threads. Temporarily secure the seal plate
to the pedestal (10) using two capscrews and nuts
(1/2 UNC x 1 1/2 inch long, not supplied).
Lubricate the O.D. of the shaft sleeve with water or
a very small amount of oil, and slide the rotating
portion of the seal assembly onto the shaft sleeve
until the face of the rotating element is just flush
with the chamfered end of the sleeve.
Slide the assembled seal and sleeve onto the shaft
until the seal faces contact. Continue to press the
shaft sleeve through the rotating portion of the seal
until it is fully seated against the shaft shoulder.
Install the seal spring and spring seat (4).
Proceed with Impeller Installation and Adjust-
ment.
Impeller Installation and Adjustment
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (5) 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 seal plate is neces-
sary for maximum pump efficiency. Measure this
clearance and add or remove impeller shims until
this clearance is reached.
NOTE
Be sure the seal plate is tight against the pedestal
while measuring this clearance.
After the back clearance is set, secure the impeller
with the hardware (30, 31 and 32).
Pump Casing Installation
If the wear plate assembly (29) was removed, posi-
tion the replacement wear plate assembly squarely
against the casing shoulder and secure it with the
mounting hardware (33, 34, 36 and 37). 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 (28) as previously re-
moved. Secure the pump casing (1) to the seal
plate and pedestal with the nuts (26). 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 (28) 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
(41) and replace as required. If separated at disas-