Drive belt slips on lawn tractor, cannot see an adjustment.

Hi,

i would check with the owners manual to see if it shows an adjustment for the belt drive. most mowers today are equipped with a self adjusting arm witha pulley tensioner with a spring attatched to it. as the belt stretches the tensioner spring pulls against the arm causing it to apply tension to the belt thus tightening it. it sounds as if your belt is stretched beyond the limits of the tensioner. at least every new season it would be a good idea to inspect the belt tensioner for room or space of free play. that is to check to see if it will move opposite the pulley allowing the belt to tighten. if there is not enough sufficient room then i suggest replacement of the drive belt.