Gorman-Rupp Pumps 04C3-B 407671 and up - Manual (Page 29)

OM-01218 0 SERIES
MAINTENANCE & REPAIR PAGE E - 9
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 im­
peller adjusting shims (37) 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 Volute Scroll
Install the correct thickness of impeller shims and
install the impeller key (25) in the shaft keyway.
Align the impeller keyway with the key and slide the
impeller onto the shaft until fully seated. When
properly installed, the shaft key will protrude
approximately 1/4 inch (6,3 mm) from the I.D. of the
impeller.
NOTE
After the impeller has been properly positioned,
check for free rotation. Correct any scraping bind­
ing before further reassembly.
Immobilize the impeller by inserting a bar between
the impeller vanes, being careful not to damage
the vanes. When the impeller is properly posi­
tioned, secure it with the hardware (26, 27 and 28).
Remove the bar from the impeller vanes.
Pump Casing and Wear Ring Installation
If removed at disassembly, press the replacement
wear ring (29) 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.
Remove the hardware temporarily securing the
seal plate to the pedestal. Install the casing gasket
(9) and secure the casing to the seal plate and ped­
estal with the nuts (11). Reinstall any leveling shims
under the casing mounting feet, and secure the
casing to the base with the previously removed
hardware.
Final Pump Assembly
Be sure the pump and power source are securely
mounted to the base.
Install the suction and discharge lines and open all
valves. Make certain that all piping connections are
tight, properly supported and secure.
Be sure the pump, pedestal and power source
have been properly lubricated, see LUBRICA­
TION.
Fill the pump casing with clean liquid. Reinstall the
fill plug (8) and tighten it.