My condenser fan motor is overheating after a few hours use. I noticed the exhaust from the fan is coming out from the top and a few inches down to below the cover. When I checked the blades it seem they have slipped down the shaft about an inch and a half (there is a mark on the shaft where the set screw was originally). The problem is that the set screw is tacked. Do I try to break the weld and maybe mess the fan up? Any suggestions?