Higher 2 cutting heights seem to work OK but the lower settings continues to throw the belt off. And now the belt hs a bad spot so I need a new 1 dlt 2000 has a 95 or 95 and a half inch belt? Thanks

Sounds like the idler pully is bad wiggle it when the mower is turned off if it is loose then you need a new pully cause the bearing is burned out on that one

Hi,
You will need to provide the model number, the one under the seat that begins with 917 for me to look up a belt. If it has been thrown, then you can about bet that it has torn fibers internally which means it will continue to come off.
Peace,
Clarke