It's common for the rear lift to drift down on some models, not sure about yours.
But a loader should not. The oil is bypassing somewhere, either a cylinder seal or the valve.
With the engine off, can the drift be stopped by slightly moving the valve lever? If so the valve is not centering properly.
It's somewhat difficult to determine if the cylinder is leaking. About the only way is to raise and block the loader, disconnect and plug the bottom port of the cylinders, loosen the top lines. Let the load down and see which cylinder goes slack. If it continues to creep down, and oil coming from the top ports, both are leaking internally.
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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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