The pump is separate from the lift cylinder, as the lifting goes if it jerks coming up you can usually hear, feel, and or see it. If its jerky on the way up its usually the control valve in the pump. If it doesn't jerk going up than its usually the lift cylinder seals, it could also the stand pipe going from the pump to the top cover could be leaking. The piston ring style seals on the piston in the lift cylinder are prone to leaking anyways.
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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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