Gorman-Rupp Pumps 03A3-B 751140 and up User Manual

Page 28

OM-01176

0 SERIES

MAINTENANCE & REPAIR

PAGE E - 9

B
2

Step 2

Step 1

Step 3

A+

B
2

C+

D
2

Figure 3. Centering Impeller Within Volute Scroll

Install the correct thickness of impeller shims and
install the impeller key (50) in the shaft keyway.
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 (37), a new
impeller capscrew (38) and the impeller lockwash
er (39). Torque the impeller capscrew (38) 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 (40) 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 (8) and secure the casing
to the seal plate and pedestal with the nuts (35).
Reinstall any leveling shims under the casing
mounting feet, and secure the casing to the base
with the previously removed hardware.

NOTE

After the pump casing has been installed, check for
free shaft rotation. Correct any scraping binding
before further reassembly.

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 (49) and tighten it.

Refer to OPERATION, Section C, before putting
the pump back into service.

LUBRICATION

Seal Assembly

The seal assembly is lubricated by the medium be
ing pumped and no additional lubrication is re
quired.