Gorman-Rupp Pumps 13A52-GX390 1371656 and up - Manual (Page 26)

10 SERIES OM−04730
MAINTENANCE & REPAIR PAGE E − 8
IMPELLER SHAFT
IMPELLER
SHIMS
O-RING
IMPELLER
SPRING
CENTERING
WASHER
SPRING RETAINER
SHAFT
SLEEVE
STATIONARY
SEAT
BELLOWS
ROTATING
ELEMENT
INTERMEDIATE
Figure 3. 25285−855 Seal Assembly
This seal is not designed for operation at
temperatures above 160
_F (71_C). Do not
use at higher operating temperatures.
Inspect the engine stub shaft for damage. Small
scratches or nicks may be removed with a fine file
or emery cloth. If the stub shaft is bent of excessive-
ly worn, replace the shaft (see the engine service
manual).
Position the intermediate against the engine bell-
housing and secure it with nuts (12).
Assemble the O-ring into the stationary seat. Press
the stationary seat into the intermediate bore until
fully seated. A push tube cut from a length 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.
Subassemble the rotating element into the retainer
and bellows. Apply a drop of light oil on the preci-
sion finished faces; never use grease. Use even
pressure to carefully press this subassembly onto
the sleeve (36) until the rotating element is just
flush with the chamfered end of the sleeve.
Slide the sleeve and assembled rotating portion of
the seal onto the shaft until the seal faces contact.
Continue to push the sleeve through the seal until it
seats squarely against the shaft shoulder.
Install the seal spring and spring centering washer.
Lubricate the seal as indicated in LUBRICATION,
after the impeller has been installed.
Impeller Installation And Adjustment
(Figure 2)
Inspect the impeller and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (37) 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 intermediate is nec-
essary for maximum pump efficiency. Measure this