About an hr ago while I was mowing the mower stopped moving mid pass. The mower is a JD L120 lawn tractor with the hydro transmission. I was moving along and all of a sudden I heard what sounded like pressure being released and then it stopped moving. Neither of the forward or backward pedals have any force against them (very easy to push down), the clutch is hard to push in, and the mower will roll easily while in "drive" mode. The hydro transmission in our last mower went out, but it made a grinding sound and would move forward still but at about .5 mph. Any tips or information about what could be wrong with it would be greatly appreciated.