Re, air pump that went in place of a spark plug. We had one back in late 5os and the valve part that screwed into the spark plug hole had a one way valve that would open on the intake stroke so most of the air sucked into the cylinder was gas free. We used it on our JD 420 as the 2 cyl had a larger displacement per cyl.
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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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