So you put a pressure gage in the line that feeds the lift side of the cylinder and the pressure goes up when the valve returns to the center position.
The only thing that would cause the pressure to rise like this is to apply pressure to the line that feeds the down side of the lift cylinder.
A leaking cylinder would never do this you would actually maintain or loose pressure as the arms go down.
I don't know the system or if someone played with how the hoses are hooked up.
I'd start with the valve and is it letting high pressure oil enter the down circuit when in the center position.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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