lawn tractor mower belt falling off

I have a 2006 Toro LX420 lawn tractor. The first 2 mower unit belts lasted approximately 2 years each; the current belt (same size) has only lasted a few months and it keeps falling off because it is too loose. What's wrong? Thanks in advance.

Reply to
fred
Loading thread data ...

HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.