A friend of mine and person I  did a lot of business with died a while back. I ended up with a bunch of wood and hardware and his old Rockwell contractors saw. An inheritance you might say. I didn’t have much use for the saw, flipped the switch and it turned on so I pushed it out of the way and it sat there for the last year. So yesterday I had my tablesaw set up for a particular project and then needed to rip a couple of boards for something else I was doing. I put a blade in the Rockwell but when I started to cut a couple of pieces of 2x fir it started to cut and then it just stopped and buzzed.  The last time I had a motor go out on a jointer I called the electric motor guys that I used to bring stuff to and they  now wanted almost the price of a new motor just to tell me what was wrong with the old one so I just bought a new motor. 
 My son just purchased a house in the California hill country and it needs a lot of work and the plan is for us to set up a shop there to do the work and, well, I have this old contractor saw….so now I do have a reason to need it.
The question is what is the most likely cause for the motor to fail in this way in the event that I attempt to repair it? Other options are to just buy a new motor of course or , I do have a really beefy and heavy 3 horse motor that seems overkill for this saw sitting in my shed.