How to Get your hydraulic cylinder apart and put a rebuild kit in at low cost, like about $105. Can easily save you 500 bucks! This is for an old John Deere 530 round Baler - has two sets of cylinders, one set for the back door, and one set that puts pressure on the rollers to make a tight baler. Rebuild kits are interchangeable for both sets of cylinders :-) this is an easy job anybody can do it!