Gorman-Rupp Pumps 03H1-B 710816 and up - Manual (Page 28)

OM-01192 0 SERIES
MAINTENANCE & REPAIR PAGE E - 9
faces contact. Continue to push the sleeve through
the seal until it is fully seated against the shaft
shoulder.
Install the seal spring.
Impeller Installation
Inspect the impeller and replace it if cracked or
badly worn.
Install the same thickness of impeller shims (4) as
previously removed.
Install the impeller key (8) in the shaft keyway. The
key sould prodrude approximately 1/4 inch (6 mm)
from the end of the shaft. Align the impeller keyway
with the key and slide the impeller onto the shaft
until fully seated.
Immobilize the impeller by inserting a bar between
the impeller vanes, being careful not to damage
the vanes. Install the impeller washer (32), a new
impeller capscrew (34) and the impeller lockwash­
er (33). Torque the impeller capscrew (34) to 20 ft.
lbs. (240 in. lbs. or 2,8 m. kg.). Remove the bar
from the impeller vanes.
Pump Reassembly
If removed at disassembly, press the replacement
wear ring (37) 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.
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 3.
Use these measurements to calculate the required
impeller location (dimension E). Add or remove
gaskets in the casing gasket set (5) until dimension
E is obtained.
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 Volute Scroll
Install the correct thickness of casing gaskets (5).
Remove the hardware temporarily securing the
seal plate to the pedestal. Secure the casing to the
seal plate and pedestal with the nuts (31). Reinstall
any leveling shims under the casing mounting feet,
and secure the casing to the base with the pre­
viously removed hardware. NOTE
After the pump casing has been installed, check for
free shaft rotation. Correct any scraping binding
before further reassembly.