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well i would take a long look at the spring which holds the tension pulley in place. if it is weak, or not connected correctly, there will be inadequate tension and the belt can come off. I would also take a look at whatever fasteners keep the deck in place as if it is not kept to the rear, there again will be too much play in the deck belt.
Not technically a solution, but there are Troybuilt tiller forums out there on the net. MTD bought them out some years back and some parts are still available. I had to go thru them to find a part number for a mid 80's Horse unit that had a broken drive coupling. Anyways, they have parts breakdowns and manuals on their site. And I've seen some on ebay if you need parts.
remove plastic belt cover remove the guard,belt/pulley work in the right side first: remove the rigth-side wheel remove the screws of the bumper remove 2 screws on bracket/transmission assembly pull the bracket install the new belt reinstall the right side screws and wheel
do the same in the left side Ps: remove the belt guide, and reverse return spring http://www.partstree.com/parts/?lc=troy_bilt&mn=21A-634K766+7HP+FRT+Roto-Tiller+(2005)&dn=0079200009