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 Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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