Gorman-Rupp Pumps 04B52-B 1346496 and up - Manual (Page 28)

OM-01232 0 SERIES
MAINTENANCE & REPAIR PAGE E - 9
Carefully slide the assembled seal plate and sta­
tionary seat over the shaft. Secure the seal plate to
the pedestal with the hardware (10). Be careful not
to damage the stationary seat on the shaft keyway.
Lubricate the seal sleeve with a small amount of
light oil and slide the rotating portion of the seal
onto the sleeve until the inboard rotating element is
just flush with the undercut end of the sleeve.
Slide the sleeve and rotating portion of the seal
onto the shaft until the seal faces contact. Continue
to push the sleeve through the seal until the sleeve
seats squarely against the shaft shoulder.
Install the seal spring and spring centering washer
(59).
Impeller Installation
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 4.
Use these measurements to calculate the required
impeller location (dimension E). Add or remove im­
peller adjusting shims (12) 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 4. Centering Impeller Within Volute Scroll
Install the correct thickness of impeller shims, and
install the impeller key (54) in the shaft keyway.
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, secure it
with the hardware (41, 42 and 43).
Pump Reassembly
If removed at disassembly, press the replacement
wear ring (44) 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.
Install the casing gasket (9) and secure the casing
to the seal plate and pedestal with the nuts (38).
Reinstall any leveling shims under the casing