When you are working on it unhook the pressure line from the tractor at the add on valve. Open the filler cap to the rear end where you add oil. Or if you are changing where the oil returns leave that hose unhooked. Then use compressed air with a rubber tipped blower or a rag wrapped on an air tip, blow a short blast of air in the valve fitting where the pressure hose was unhooked. If it blows air into the trans reservoir or out the disconnected return hose your valve WILL NOT WORK correctly. It is an open center valve. You need a CLOSED-CENTER valve.
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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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