I have a 1979 L-2 non-hydro and the right hand pivot drive belt tightens on its own. It eventually breaks and piles up everything. Even with the updated torque sensor it still does it. I have to watch the cylinder rpm gauge and as soon as it goes up I have to stop the combine and loosen the belt off, otherwise everything will pile up again. It is definitely worse at low cylinder speeds, such as in a heavy canola crop. Any ideas??