Gorman-Rupp Pumps 03C51-B 1341129 and up - Manual (Page 27)

0 SERIES OM-01141
MAINTENANCE & REPAIR PAGE E - 8
This seal is not designed for operation at
temperatures above 160
_F (71_C). Do not
use at higher operating temperatures.
Clean all of the old adhesive from the face of the
seal plate before installation. Position the seal plate
(21) on a flat surface with the impeller side facing
up.
Subassemble the O‐ring onto the stationary ele­
ment and use even pressure to press this subas­
sembly into the seal plate bore until it seats square­
ly against the shoulder bore.
Carefully slide the assembled seal plate and sta­
tionary seat over the shaft. Use caution not to nick
or damage the stationary seat. Temporarily secure
the seal plate to the pedestal (21) using two cap­
screws and nuts (1/2 UNC X 1 1/2 inch long, not
supplied).
Subassemble the rotating element into the retainer
and bellows. Lubricate the I.D. of the bellows with
water, and slide this subassembly over the shaft
until the polished faces contact.
Install the seal spring and spring centering washer
(15).
Impeller Installation
Inspect the impeller and replace it if cracked or
badly worn.
For maximum pump efficiency, the impeller should
be centered within the vane plate (24).
To verify the impeller positioning, measure the
vane plate and impeller as shown in Figure 3. Use
these measurements to calculate the required im­
peller location (dimension E). Add or remove im­
peller adjusting shims (16) until dimension E is ob­
tained.
D
B
2
A B
2
C D
E
Step 2 Step 1 Step 3
A+
B
2
C+
D
2
E = -
Figure 3. Centering Impeller Within Vane Plate
Install the correct thickness of impeller shims and
install the impeller key (7) in the shaft keyway. The
impeller key should protrude approximately 3/16
inch (4,7 mm) from the end of the shaft. Align the
impeller keyway with the key and slide the impeller
onto the shaft until fully seated.
NOTE
After the impeller has been properly positioned,
check for free rotation. Correct any scraping bind­
ing before further reassembly.
When the impeller is properly positioned, install the
impeller washer (25) with the hole positioned over
the end of the key (7). Immobilize the impeller by
wedging a soft brass rod between the vanes, and
secure the impeller and washer the hardware (26
and 27). Torque the capscrew to 20 ft. lbs. (2.8 m.
kg.).