Hi All. I purchase a use 8" General International Jointer. 3 phase, 600volt machine. 2hp. Magnetic Switch looked broke/tampered with when purchased, However parts inside switch looked 'ok' Other than that very clean machine. Plugged in Machine (to the proper 600 volt receptacle) at first the switch- not machine hummed but nothing happened. I dismantled the motor and blew out all the dust from the inside. I could NOT find a centrifugal switch or capacitor. I put the motor back together. The switch does not work when the cover is on (or green button is pressed) however if I take the cover off and press the plastic button (not the one the green button activates, another one in the switch box) with my finger the engine will turn and start. However, once I put the belts back on the machine so there is a little LOAD, the engine will NOT turn. It hums but wont start. I'm not a electrician, but I am confused. Thanks for the help.