You probably know this, but scribe a mark across the valve and worm gear housing as a reference point, then just barely tap the housing to adjust it while watching the reference point. A few thousandths makes a difference. Could be the roll pin inside has a flat spot worn on it too and a worn pin can make centering perfectly hard to do. I've been in there and replaced the pin but it's been awhile. Maybe someone on the John Deere board can walk you through it if you can't get the valve to center the way you want it to be.
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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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