I am borrowing my neighbor's 27-ton Troy-Bilt log splitter. Works fine except (and he warned me) that the handle sometimes pops back to neutral when in reverse mode. Sometimes a second attempt lets it auto-reverse the ram, other times I have to hold it in place to prevent it from prematurely kicking back into neutral. Kind of a bummer when I want to be loading the next log. Is this something I can adjust/fix myself, or does the valve need to be replaced?