I had the same problem on my B8200. I tried to find a repair kit but it was just too old (or there never was one available). I took it apart, drilled and installed sleeves and bigger pins, but that didn't really help much. The spools were not moving the full length because the control pivot points were worn, and I had very little pressure moving the bucket (slow and weak). i bought a new single joystick control from Northern Tool, part PLV22TSTKAB, and the open center port (have to call them for that part), for $285. Once the new valve was installed it worked much better than it ever has since I bought the tractor.