I originally posted my question in the wrong forum section - didn't realize that it had a hydraulics section. The problem is my tractor FEL won't lower. When I push the joystick controller forward to lower the bucket, the bucket raises instead of lowering. The other functions, tilting and raising, work ok. The loader manufacturer (Koyker) hasn't seen this problem before. They think that maybe the return line from the FEL could be blocked or have back pressure, but don't think that the problem is with the controller. Has anyone experienced this problem ? Any thoughts on the cause ?