Gorman-Rupp Pumps 86B52-B 1336823 and up - Manual (Page 30)

OM−00971 80 SERIES
MAINTENANCE & REPAIR PAGE E − 9
IMPELLER
SHAFT
SEAL
PLATE
ROTATING
ELEMENT
SPRING
SEAT
RETAINER
SPRING
IMPELLER
ADJUSTING
SHIMS
IMPELLER
BELLOWS
SHAFT
SLEEVE
O-RING
STATIONARY
SEAT
Figure 3. 25285−856 Seal Assembly
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 (14) 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.
Slide the assembled seal plate and stationary seat
over the impeller shaft (28) and secure it to the ped-
estal (21) with the machine screws (10).
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 (12).
Impeller Installation and Adjustment
Inspect the impeller and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (9) as previously removed, and screw the
impeller onto the shaft until tight.
A clearance of .020 to .040 inch (0,51 to 1,02 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.