Hey all. I have a 2001 sears craftsman riding lawn mower (42 inch cut) and just recently, I have heard a grinding noise and noticed the belt smoking around the front engine pulley. Just to give some further details, the grinding, screeching noise started first as I was driving. And then it would quit. After doing some regular maint. on the mower, I changed the lower belt out and when I cranked it, it ran fine for just a few seconds and then the grinding noise started again along with the smoke. This happened with the mower in neutral and the blades not engaged. What could be happening here?