5hp 110v air compressor hums after its already filled its tank and shut off
It hums after its already filled its tank and shut off it won't start up till the pressure is at 30 or 40, and its done manually
If you are saying that your air compressor hums when it is trying to restart, that could be caused by a few things.
If the power supply is weak... long extension cord, too many other appliances pulling power from the same circuit, that could be a cause.
If the motor is weakening, that may cause it.
But likely, if there is no extension cord involved, your start capacitor is failing. See how to test it on this site.