Boy I would have the spindles checked out. This is why I switched from exmark to deere because the spindles were sealed bearings and maintenance free. How many hours do you have on it? I had to start changing spindles it seemed around 500 hours. I'm a firm believer in preventive maintenance and I still believe that if someone can grease something it will last longer than the maintenance free stuff they have out now. Jack it up and see if the blades move side to side or up and down at all. If so your spindles are toast and that is your problem.
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