|Posted by More on March 07, 2002 at 22:20:26:|
|In response to Re: Sewage Pump Problem|
You say that you have verified that the pump is turning, but have you verified that the pump shaft is actually turning the pump impeller? Just because the pump motor engages and hums and vibrates when you add water does not mean that the impeller is turning. There are a few things you could do to see whats wrong. 1) you could tap the exhaust line and install a pressure gauge to read the pump exhaust pressure; 2) you could cut the 2 inch pvc after the check valve, and add a clear pipe hose section with a flow restrictor to examine the pump output visually; or 3 ) you can unbolt the pump and impeller from the sump pump shroud and physically examine the impeller for damage, and the keyway in the pump motor shaft to see if the impeller is firmly attached and spins forcefully when the motor runs.
There is not likely an installation problem ; or even an "undersized pump" problem, if the pump worked well for a year or more.
: When the 2" PVC above the pump and check valve (approx 10') is empty, the pump has plenty of power to push open the check valve and pump water out (I am testing w/water before throwing "solids" at it). However, when the PVC column is full of water, the pump just runs and runs, but never pushes any water. I have verified that the pump is turning, and therefore have concluded that the pump doesn't have the power to overcome the pressure of the column of water and open the check valve.
: Is this a clear sign that the pump is undersized, or if something is wrong w/the pump, or is there possibly some installation problem?
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