Still chasing this problem on my 5200. It started with a stuck valve that runs the #1 SCV. After no progress from tearing into it and cleaning up the detent I put it back together. Now the three point will not move. If I grab it and pull the arm up it will travel all the way and the opposite arm moves with it. It does sound like the hydraulic pump is running a little as soon as the tractor is started. Any ideas?