The PTO clutch pulley on a 782 is pretty small, and so is the pulley on the QA36A and QA42A, so not much belt contact area there. If you use an OEM belt, you should be alright. I've destroyed 2 Gates green belts with my 782 and QA36A. It's cheap to change the pulley, so I'd suggest trying that first. If all else fails, change the gears.
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