Yesterday I took delivery of a brand new Gravely ZT HD 60" mower. When I first started using it I thought the deck vibrated a bit too much, but figured brand new it must be like that. After about 1/2 hour of use I could smell something burning. I stopped to check it out and found the left pully guard had a quarter size raised burn mark in the center. I looked underneath the guard and there is a bolt sticking out the top of the spindle that is hitting the guard. Any advice would be appreciated. I'm calling the dealer on Monday.