Above your right rear tire is a bronze threaded rod with a spring and two nuts on it. You can see it move when you move the hydraulic lever. Tighten down the bolts about 1 inch, this causes increased tension on the spring when the lever is up and the added tension pushes the lever back to neutral. If you hear a continous grinding noise after the lever pops back, then back off the tension slowly until the lever pops back and you don't hear the noise. It may take a few turns, but you will get it. I just fixed mine that way. There is a spring on the front of the rod also that will cause the rod to pop back from the down position but its much harder to reach.