This valve is PILOT OPERATED meaning the valve part that you can push to open is controlled by another smaller capsule inside the valve. The pressure setting of that capsule is what controls at what pressure the valve will open. A valve that is stuck in the open position will look and feel just like a good one because the part that is causing the problem is inside where it cannot be seen. Because it is a pilot operated valve when it goes bad it will open completely as soon as any oil flow reaches it and will stay open at all flow rates. That is why if the valve is bad increasing the engine speed will still not lift the planter. Your problem is not in the valve. You either have a pump that is not capable of creating enough pressure/flow or a leak. Since the problem came on rather suddenly most likely the problem is a leak. The most likely spot for that to happen is the O-ring between the hitch pump cover plate and the rear frame.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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