Gorman-Rupp Pumps 12D1-1B20 1463862 and up - Manual (Page 26)

10 SERIES OM−06361
MAINTENANCE & REPAIR PAGE E − 8
finished faces. Assemble the seal as follows, (see
Figure 3).
IMPELLER
SPRING
RETAINER
SPRING
RETAINER
INTERMEDIATE
SHAFT
SLEEVE
STATIONARY
SEAT
ROTATING
ELEMENT
DRIVE BAND
IMPELLER
SHIMS
IMPELLER
SHAFT
BELLOWS
Figure 3. Seal Assembly
This seal is not designed for operation at
temperatures above 160
_F (71_C). Do not
use at higher operating temperatures.
Press the stationary subassembly into the interme-
diate (9) until fully seated. After installation, wipe
the sealing face lightly in a concentric pattern with
a clean, lint-free tissue.
Position the intermediate and stationary subas-
sembly over the shaft and against the engine. Se-
cure the intermediate to the engine with the hard-
ware (5 and 6).
Slide the rotating subassembly (consisting of the
element, bellows and retainer) over the lubricated
shaft sleeve until the rotating element is just flush
with the chamfered end of the sleeve. Slide the
sleeve over the shaft until the sealing faces con-
tact. Continue to press the shaft sleeve through the
seal assembly until it seats squarely against the
shaft shoulder.
Install the seal spring and spring retainer (11).
Impeller Installation And Adjustment
(Figure 2)
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller
shims (12) as previously removed and screw the
impeller onto the shaft until tight.
A clearance of .015 to .040 inch (0,38 to 1,02 mm)
between the impeller and the intermediate is nec-
essary for maximum pump efficiency. Measure this
clearance and add or remove impeller shims until
this clearance is reached.