Vertex 60" destroys deck belt and tension bracket out of align.

[James1549]

I maintain 3 Vertex 60" mowers all with the same problem. The deck belt starts to shred and break and eventually comes off the pulley and jams under one of the pulleys. You can see that the tensioner bracket is out of alignment when this begins to happen. Exmark has replaced the tensioner bracket, pulley, and belt several times with the same end results a few months later. The factory's first suggestion was to always engage the blades at full throttle. Didn't care much for that fix but the problem did not go away. Second fix was to replace all the brackets and with a new bolt. Less than two months away and we are back to same issue, shredded belts and out of alignment tensioner pulley. Some thought that the higher horsepower engines are creating too much torque causing the tensioner bracket to tweak. I have attached pics using a straight edge. Any thoughts would be appreciated. This is already an issue with down time, but what happens after the warranty period?

Thanks, James