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 - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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