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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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