I recently picked up a Ingersoll 4020 that was running good but ½ way through cutting my yard it started vibrating when I would put the forward reverse hydro lever in natural. The more I ran it the worse it seemed to get. It was starting vibrating when I would be moving slowly. If anyone has any ideas or has had something similar happen to them I would appreciate it. I haven’t dug into this much yet I was just wanting to see if anyone had any ideas before I jump into it .