Originally Posted by hman17024
I know that it's getting power because when I was messing with it I hit the rest switch on the motor and hit the on switch and I could hear buzzing from the motor like its stuck or something. I'm not an expert but I talked to a few people and they told me that some times the bearings go bad. I was sanding some areas on my transmission with my DA sander and I noticed that I was losing pressure. I went to go check on my compressor and sure enough the electrical motor kicked the curb
If your compressor is 220v, the pressure switch has two contacts in it, one for each 110v leg. If one of those legs are burnt out or not making contact, the motor will just hum also. It may very well be the motor but I would double check all of the simple stuff first.
Just make sure you shut the power off before doing any testing.