The block contains a single acting check valve. It blocks oil from returning to the control valve unless it is opened by pressure on the other hose.
Since the control valve is not completely leak proof, the check valve keeps the cylinder from settling when it is carrying a load. Because the valve requires hydraulic pressure to open you cannot lower the hitch unless the engine is running.
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Today's Featured Article - The Tractor Parade: Story of a Case SC - by Bernie DeLon. On a early fall morning back in 1994, I opened the newspaper and happened to spy an article about a local antique tractor club having their annual show that weekend.
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