I wasn't there when the repair person came so this is second hand info. He reportedly said that the "pivot valve for the hydrolytic system was worn & needed replacing & JD didn't support it anymore". I haven't looked in my manual yet & thought I might get a quick answer. Guess I'll have to do my homework & call him; then find in my manual. It sounded a bit funny to me but I haven't done much work on the hydrolytic system. Thanks for the reply