Have a 2011 ZD 326 commercial mower with 250 hrs. Mow approx 10 acres per week. Left bearing on mower deck started to make noise and wobble. Took to dealer for repairs they said blade was bent but no marks on blade like it hit anything. They said bottom bearing had grease but none on top, bent spindle and housing. They said it didn't fall under warranty cost 667.00. Then 10 hrs latter right bearing went out, took back to dealer and they was happy fix for another 156.00. Also had them replace center bearing while they at it. We have been mowing same 10 acres for 2 years. I don' t know why it is not warranty work.