I have learned that the two valves on the front of the plow are Gresen 3100 "cross-port relief" valves. According to a technical representative at Parker Hannifin Corporation, who purchased the Gresen Hydraulics company, they are designed to eliminate or reduce shock, surge, or overload conditions on the hydraulic cylinders and motors. They were not on the original plow from JD so my assumption is that they are optional and were added for some reason sometime after the plow was originally purchased. Because they are apparently optional, I am going to see if this cross port relief valve is the problem by by-passing the valve and see if the plow will roll-over. It is my assumption that because the roll-over cylinder is not leaking then it is working properly and it is not a possible cause for roll-over failure. If the cylinder could be defective while not leaking then someone please correct me.
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