Does it leak clear down?? if the valve is good the cylinders will only leak down far enough to allow the pressure to equalize on each side of the cylinder then the cylinder will stop and in effect becomes a displacement cylinder with the rod area on the bottom of the cylinder doing the supporting. The reason this happens is that the return from the top of the cylinder has no return because the spool is closed so pressure builds up in each port as the piston area on the bottom has more displacement than the rod end as the rod end of the cylinder contains the rod which causes it to hold less oil than the bottom. Kinda complex and I hope I have not added to the confusion but I have made a life of diagnosing these problems ( 50 yrs in June). If your loader is equipped with disconnects you could support the bucket, uncouple your disconnects and remove the support. With the valve out of the system you could remove the coupler from the rod eye end of the cylinder and see if you get leakdown and oil leakage from the open hose as that would allow oil seeping past the packing a low pressure place to go.
Isolating a leaky cylinder is another issue as if one is leaking internally it will allow both to leak down on a tandem cylinder system. mEl
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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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