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Inspecting a Pump Rotor
The pump Rotor has a life expectancy of about 15 years. Besides old age, the following can
cause Rotor wear:
• High flow (business, industry or infiltration)
• Abrasives
• Pump running dry
The Rotor does not have to be removed from the motor shaft for inspection. When inspecting
the Rotor, do not worry about scratches, lines, casting marks or pit marks. Check the high,
rounded lobes that spiral the length of the Rotor. If the lobes have been worn flat into a ¼ inch
or wider band, the Rotor is worn and must be replaced.