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Impeller loose on shaft. Disconnect power, remove pump from sump and observe for freedom of impeller and shaft rotation. . Tighten fasteners, replace key.
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Impeller rubbing inlet plate or pump housing. Disconnect power, remove pump from sump and observe for freedom of impeller and shaft rotation. Return pump to Authorized Service Center.
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Worn out or defective pump or motor bearings. Examine and observe. Replace pump bearing.
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Loose shaft coupling. Disconnect power, remove pump from sump and observe for freedom of impeller and shaft rotation. Tighten coupling and set screws.
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Obstructed rotating parts. Disconnect power, remove pump from sump and observe for freedom of impeller and shaft rotation. Clean volute and impeller and remove any blockage.
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Discharge plumbing connected directly to floor joists. Examine and observe. Readjust discharge piping and pump.
Replace portion of discharge with rubber hose or install vibration isolator.
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Pump not positioned firmly on bottom of sump. Disconnect power and check pump for stability. Readjust discharge piping and pump.
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Gravel or stones on bottom of sump. Evacuate sump. Clean sump.
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