After months of family health problems and other projects I'm finally back to the 1550. The 3-point will not go up or down. Have had the top of the hydraulics open and looked at the servo and changed the pin that John thought could be the issue. The pin looked fine and measured the same as the new on but the new one was installed. Reassembled and it still doesn't work. Now I'm wondering about the control handle. Does it run a shaft inside the tube you can see between the handle and the hydraulic housing? I can't tell if it is actually turning anything and wished now I'd have noticed before putting the top back on the tank. Haven't had a chance to clean that area up and look for set screws (are there any)or is this even a possibility? I'd sure like to finally get this on project off my list. After having the injection pump gone through as well as the injectors I have too much into this thing for it not to be a usable tractor. Any idea(s)where I should go next with a this hydraulic problem?