Yesterday while tilling up food plots my PTO stated to make a grinding noise and would kick into neutral. Took it back to house and removed tiller and with nothing hooked up PTO will engage and run smoothly, but if I begin to slowly move lever to the Neutral position there is a metal on metal noise and it throws it into Neutral. Drained fluid to see if there was any metal flakes or chunks and oil was clean. Can't seem to find a good detailed break down of the system. Looking for any other possibilities before I commit to breaking it all apart. Any help would be appreciated!!