Everett, Do you mean drive belt keeps coming off front pulley?
Possible causes, accumulated dirt/debris above deck or on trans axle, damage,stretched,wrong size belt, belt tensioner seized/missing spring if equipped, belt retainers/guides/keepers damaged /missing/ adjusted to far from pulley
, damaged/worn pulleys, loose engine, belt way out of alignment,etc.
Check the attached links,instruction and guides, Good luck
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