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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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