Gorman-Rupp Pumps 81 1/2B52-B 1240557 and up - Manual (Page 27)

OM−01525 80 SERIES
MAINTENANCE & REPAIR PAGE E − 8
To ease installation of the seal, lubricate the O.D. of
the stationary seat and shaft sleeve with water or a
very small amount of oil, and apply a drop of light lubricating oil on the finished faces. Assemble the
seal as follows (see Figure E−3).
SEAL PLATE
SLINGER
RING
IMPELLER
SHAFT
STATIONARY
SEAT
STATIONARY
ELEMENT ROTATING
ELEMENT
DRIVE BAND
BELLOWS
IMPELLER
SHIMS
IMPELLER
SPRING
RETAINER
SHAFT
SLEEVE
SPRING
RETAINER
Figure E−3. 25285−853 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 (19) on a flat surface with the
impeller side up, and press the stationary seat and
element into the seal plate until fully seated in the
seal plate bore.
Slide the seal plate over the shaft until fully seated
against the pedestal (9). Temporarily secure the
seal plate to the pedestal using two capscrews and
nuts (3/8-16 UNC X 1 1/2 inch long, not supplied).
Be careful not to damage the oil seal lip on the
shaft threads.
Slide the rotating portion of the seal (consisting of
the rotating element, retainer and bellows) onto the
lubricated shaft sleeve until the rotating element is
just flush with the chamfered end of the sleeve.
Slide the sleeve and rotating subassembly onto
the shaft until the seal elements contact. Continue
to push the sleeve through the seal until it bottoms
against the shaft shoulder.
Install the seal spring and spring retainer (5).
Impeller Installation And Adjustment
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (4 and 39) as previously removed, and
screw the impeller onto the shaft until tight.
A clearance of .015 to .025 inch (0,38 to 0,64 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.