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If this is a typical hydraulic cylinder, the seal that you can see around the piston rod is only a dust seal or "wiper", and replacing it will not stop leaking around the piston rod, at least not for long. To replace the actual piston rod seal or "O" ring, the cylinder needs to be disassembled, and the piston rod must be pulled out of the "head" or endpiece of the cylinder. The actual "O" ring, or seal will be inside the rod bore, and visible once the road is withdrawn from the head. Is this a tie-rod type of cylinder or is the "head" screwed in or held in with a snap ring? Once you determine this and remove the endpiece from the cylinder and pull out the piston and rod, you will have access to the piston end of the rod, which usually has a nut holding the piston to the rod. You can then hold the pusher at the other end of the rod in a vise, and use a wrench on the nut next to the piston. Either that nut, or the pusher at the other end of the rod should unscrew. It doesn't matter which comes loose, as you will then be able to remove the piston rod one way or the other, from the endpiece of the cylinder to gain access to the rod seal(s) inside.
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