why do my supertin belt keep comming off just brought new it jumps off what could be wrong please help
Sounds like you have a idler/tensioner pulley that is not running straight so the belt just walks off.
what do i do to corect the prob
Find out what one is causing the problem, if your doing this yourself then remove the belt and grab each pulley and see if you can get any up/down or sideways movement, if you can then that one needs replaced, make sure you check them all.
If I may add, you may have to replace the belt tensioner as the arm separates from the mounting, causing the belt to be out of line which causes a squeak in the belt. Just make sure and check the belt tensioner.
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