Gorman-Rupp Pumps 04B3-F4L 1242057 thru 1316965 - Manual (Page 34)

OM--01216 0 SERIES
MAINTENANCE & REPAIR PAGE E -- 13
Subassemble the O-ring onto the stationary ele-
ment and use even pressure to press this subas-
sembly into the seal plate until it seats squarely
against the shoulder bore
Carefully slide the assembled seal plate and sta-
tionary seal element over the shaft. Secure the seal
plate to the intermediate with the round head ma-
chine screws (10).
NOTE
It is recommended that a tapered sleeve be in-
stalled over the end of the impeller shaft to ease in-
stallation of the rotating seal components.
Subassemble the rotating element into the retainer
and bellows. Lubricate the I.D. of the bellows with
water, and slide this subassembly over the tapered
sleeve and onto the shaft until the polished faces
contact. Install the seal spring.
Impeller Installation
(Figure 2)
Inspect the impeller, and replace it if cracked or
badly worn.
For maximum pump efficiency, the impeller should
be centered within the volute scroll.
To verify the impeller positioning, measure the
pump casing and impeller as shown in Figure 6.
Use these measurements to calculate the required
impeller location (dimension E). Add or remove im-
peller adjusting shims (17) 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 6. Centering Impeller Within Volute Scroll
Install the correct thickness of impeller shims, and
install the impeller key (31) in the shaft keyway.
Align the impeller keyway with the key, and slide
the impeller onto the shaft until fully seated. Make
sure the seal spring seats squarely over the shoul-
der on the back of the impeller.
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, secure it
with the hardware (41, 42 and 43).
Pump Reassembly
(Figure 2)
If removed at disassembly, press the replacement
wear ring (7) into the pump casing until it seats
squarely against the shoulder bore.
The wear ring must seat squarely in the
casing bore or binding and/or excessive
wear will result.