When my 825 lost drive on one side, it turned out to be one of the small ball joints on the end of the linkage from the lever to the valve. The Bobcat dealer was able to order them for me. It looked like the material around the ball just disappeared, it wasn't melted, or worn, just gone! The other three where just like new, which makes sense, because everything on the 825 sits under the cover above the 27 gallons of oil. The new one has been in two years now, and no more problems! I hope yours turns out to be this easy. Jerry