Rebuilding hydraulic cylinders?

I would suggest removing the cylinder that is leaking the worst and taking it apart to see how it works and what is worn or broken. Single action cylinders that I have worked on were very simple with seals only at the joint between the rod and the barrel. Double action cylinders also have internal seals that won't leak on the ground, but might allow a loader to slowly drop from a raised position. Of the cylinders I have worked on, some come apart by the joint where the seal is unscrewing from the barrel. Others come apart by removing snap rings and others unbolt. If it isn't obvious how they come apart once you have the outside cleaned up, I would suggest taking the cylinders to a good hydraulic shop for an estimate.

The hydraulic shop probably has or can get proper seals. Having the shop rebuild the cylinders can get expensive--I paid over $400 to have the cheapest shop in town rebuild a double action cylinder--but they guaranteed their work. Another single action cylinder I fixed by replacing the washerlike stack of seals cost me less than $20 to repair and get to stop leaking. But I know that the rod really should have been replaced, as some of the chrome is rubbed off. But that proper repair will have to wait for another day. I use that tractor and loader all the time and in 2 years since I repaired that cylinder, it hasn't done more than seep a little. OK for now! Good luck.

Hercules hydraulics is a catalog house that has a ton of cylinder rebuild parts. Not sure what they have on the net, but you might do some searching to find out.

Fessman