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8. Slide the Stator and Liner off of the Rotor. The Liner may be inside of the Suction
Housing. The Liner must be removed and replaced when the Stator is replaced. The
Liner protects the Stator from wearing against the Suction Housing.
Figure 6 - 6
9. Inspect the Stator for wear. The next section describes types and causes of wear. It is
important to determine the cause of the wear or the pump will fail again. The average life
of a Stator is 10 years.
Pump Stator Inspection
Three types of Stator wear can cause pump failure: a tear or hole in the Stator, worn lobes or a
swollen stator. Each type of Stator wear is discussed below.
Tear/Hole in the Pump Stator
A hole or tear in the Stator is caused by a blockage in the discharge line. If the pump runs for a
long period of time against a blocked line, the high pressure (approx. 150 PSI) in the pump
cavity will rupture or tear the Stator.
The blockage must be cleared before the pump is put back into service. Check the discharge
line for a plugged line, closed valve, frozen valve or bad Check/Anti-siphon valve.
Worn Lobes
Examine the lobed area in the center of the Stator. Normally, the rubber lobes are rounded at
the high points; worn lobes are flattened at the high points. On flattened lobes, the texture of the
worn rubber is either smooth or rough.
Stator lobes that have worn rough display one or more of these characteristics:
• Wear looks rough and loose pieces of rubber hang from the lobes.
• Rubber is stuck in the lower valley between the lobes.
• The rubber is soft or has hard spots on it.
• Worn lobes display surface cracks resembling weather-checking on an old tire.
• The Rotor has rubber stuck to it.
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