Pump End 5–4
Lobes Worn Smooth. Old age is the most common reason for smooth wear. The average
life of a stator operating in a single-family home (300 gpd) is about 10 years. Higher incoming
ows will shorten the life of the stator. If two homes are on the same station, the stator will last
about ve years. However, if the stator has worn prematurely (less than six years for a single-
family home), abrasives cause the wear.
Look into the void between the inner skirt and the outer bore of stator. Check for an
accumulation of more than 1/8 inch of any of these types of materials: sand, goldsh stones,
gravel, kitty litter, glass, etc.
Determine and eliminate the source of the abrasives or the stator will fail prematurely. Check
for inltration from a broken line, a sump or even a roof drain. Additionally
, ensure that the
homeowner is not introducing the abrasive materials through a toilet or sink.
Lobes Worn Rough. A pump that has run dry is the most common reason for lobes that have
worn rough. To determine the cause of a pump running dry:
1. Check to see if the Equalizer tube is plugged.
2. Check the tank vent. Ensure the vent is clear and installed properly.
3. Check the sensing line to ensure it is clear. Visually inspect the sensing line for
blockage.
4. Check for an obstruction at the suction end of the pump (inlet shroud). An obstruction
will restrict the ow. Check for objects such as a board, junction box cover, heavy
glove or plate.
5. Inspect and troubleshoot the electrical controls. Refer to Chapter 9 – Control Cavity.
6. Check the push-to-run/redundant run circuit. Check the push-to-run circuit for all
units with this feature.
7. Check for shorts in the panel, tray cable, EQD and control compartment. Two wires
touching, corrosion or water can cause shorts. Refer to Chapter 2 – Troubleshooting.
Swollen Pump Stator
Petroleum-based products such as paint thinner, photo-developing chemicals, gas, oil, brake
uid, transmission uid, etc. will cause a swollen pump stator; introduction of these types of
products into the system must be eliminated or the problem will reoccur. The pump stator is
made of EPDM material, which absorbs petroleum the way a sponge absorbs water. If the
pump stator appears to have no wear but will not pump liquid, compare it to a new stator.
Slide the old stator over the pump rotor and remove it. Slide the new stator over the rotor and
remove it. If the new stator ts tighter or if the old stator appears larger than the new one, the
pump stator needs to be replaced.
Note: Never intentionally introduce petroleum based-products to a public sewer system. If they are
present, contact your local distributor and ask for an oil-resistant stator, service PT# 8005.
This stator is not recommended for normal residential conditions because of reduce life
expectancy (average of 2 to 3 years).
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