Not sure what type mower is but as long as the tensioner is moving to tighten the belt then you will need to replace the belt.Most tensioners have a spring attached to them make sure you did not lose a spring or the tensioner is not stuck and going to full depth before you replace the belt.
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Not sure what type mower is but as long as the tensioner is moving to tighten the belt then you will need to replace the belt.Most tensioners have a spring attached to them make sure you did not lose a spring or the tensioner is not stuck and going to full depth before you replace the belt.