I would try mowing a thick field if possible to work the deck. With thick grass, the belt would certainly pop off if it were going to. If you see black dust under the belt cover, then you have a problem.
there is no black dust. The deck was just dirty in the pic. Also i have mowed some good thick stuff and the belt didnt come off. I was just looking for a fix on the belt going nuts.I would try mowing a thick field if possible to work the deck. With thick grass, the belt would certainly pop off if it were going to. If you see black dust under the belt cover, then you have a problem.