1) Make sure that the pressure relief valve is working- although this breakage is still possible with a properly functioning relief valve.
2) Make sure that the quadrant controls (lift controls) are adjusted properly. If they are not, the cylinder can bottom out and the valve will be in "constant pumping" as they refer to it on the newer models.
The pressure relief valve is just ahead of the side cover on the "dipstick" side of the transmission- if it is still full of oil you will have to drain 4-5 gallons out to see it. They aren't that expensive, and I would replace it if it were mine.
I do not know the steps for checking the adjustments of the quadrant controls off the top of my head, but if you own or have access to an I&T manual, they do a pretty good job. An MF service manual will go into a little more detail.
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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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