Did the screws come loose? I had that happen to a HW 3656, exact same thing except I got a few days out of it.
HW covered it, but the feeble little screw these companies are using to hold 1.5hp+ motors together needs to be rethought. They did loctight from the factory.

I have to check screws every month or so and every once in a while I will find one or two trying to work their way out. Next time I dig into it I'm using red loctight, its a sealed motor so I don't care if it ever comes apart at this point.