I'm with /pine. After cleaning around it, I would pull the cap and see if the detent isn't all gunked up. Wouldn't hurt to try loosing the bolts that hold the sections together a little, but if it worked when first put on, I don't think that would be the problem. The SVC valves are normally before the 3-point, so if that valve (or any other) is not in neutral, that is why your 3-point isn't working. If a valve is dead heading the pump and sending oil over the relief valve, that would answer why the oil got so hot.