I am having a couple of problems with my JD 647 Qwik Trak. The right hydro controller gets stuck in the reverse position sometimes. Its like it is getting hung up on something...but I cant seem to find what it is. Also, you have to wiggle the hydro arms and get them just right to start the mower. Im sure this is the safety switch stuff....its like the control arms need to be adjusted. Anyone have any advice how to fix these small problems?