Went to use my dust collector tonight, and the motor doesn't spin. It just sits there and hums. Took off the intake hose, gave the impeller a spin, then turned it on and it runs like a scared rat. It is several years old, but doesn't get used more than an couple of hours a week (don't have a lot of woodworking time). The motor is being run on 120V, and has 9 amp draw. Anyone know if this is fixable, or do I need a new dust collector motor?