Hi everyone, first time on forum.Have a 72" turf tiger keeps blowing belts.First scag belt lasted all season,about 50 hrs mower time. Replaced that belt this spring,lasted about 40 hrs.Checked all pulleys and idlers,the only problem I can find is the center pulley looks like the hub was welded not square ,has about 3/16 deflection.This is a commercial machine and I should be able to go more than 50 hrs on a belt.