Pump End 5–5
Inspecting a Pump Rotor
The pump rotor has a life expectancy of about 15 years. Besides age, the following can cause
rotor wear:
• High ow (business, industry or inltration)
• 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 at into a 1/4-inch
or wider band, the rotor is worn and must be replaced.
Rubber found on the rotor indicates that the pump has run dry. Rubber can be cleaned with
acetone, paint thinner or other petroleum cleaner. Inspect the rotor for excessive wear and
replace it if necessary. If unsure, replace the stator and liner and perform a ow check. Flow
should read about 14 gpm at 15 psi. Run the pump allowing the discharge to ow into a 5
gallon bucket. Filling the bucket at 15 psi should take about 23 seconds.
Worn New Rubber
(Run Dry)
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