Update on my 123 hydro problems. After initially thinking it was a problem with the check valves coming up, turns out it was a bad suction line that was leaking fluid. Started as a small leak that I hadn't noticed, then after fooling with it realized the line was broken off. Needless to say, the small leak became a big leak. Replaced the suction line, added some more tranny fluid and so far so good. Check valves are working fine. Now just gotta get some adjustments made and hopefully all will be well. Not too bad for a tractor that sat for 6+ years. So far only about $50 in parts, but won't mention the hours spent fooling with it!! Oh well, what can you do!