Just got a 2012 Turf Revitilizer and having problems with the new drive setup. After machine has run for 30 minutes or so and everything is running warm it will not be engage tight enough to cut the soil, not even 1/8 inch deep. I am not familer with that type of drive so not sure on adjustment. Also has a bearing going out on this drive. Drove 150 miles to dealer tohave it looked at since under warrenty and they said they had it fixed. When machine is cold it will always work. Today it would'nt work again after 45 min use. Does anyone have one of these new units ?