My center belt on a 30' draper keeps plugging several times a day on a 9750 in barley. Hasn't given me any trouble in wheat. I've adjusted the tension as far as I dare being concerned about excessive wear, and have both of the other belts in the outer positions. I've also advanced the timing on the auguer. It's feeding very smoothly without slugging, and yet just quits suddenly. If anyone else is encountering this, I'd appreciate a response.