Let Us Assume that Your Cylinder is Repairable

Let us assume that your cylinder is repairable, perhaps an NFPA type, and it isn't working.Rather than first taking the cylinder to a shop to determine the problem, take it apart in your shop. Usually all this will entail is to remove the nuts or bolts on the end of the tie rods on the rod-end of the cylinder, and pull that cap off.The cylinder rod will be extending through the rod-end cap, so as you remove that cap, you will get the rod, piston and end cap as a unit.Examine the cylinder rod. Is it scored or scratched? If so, then these imperfections will likely be cutting the seals where the rod passes through the rod-end cap. If it is those seals that are leaking now, replacing them will only solve the problem for a short time before they start to leak again.

Why is the rod scored? Has external debris being carried back to the rod wiper and lodged there? That may be what is scratching the rod. If there is no debris, check that the seals inside the rod bearing are not worn to the point where there's metal to metal contact abrading the surface of the rod?If the rod is scored, replace it. Most piston rods are threaded and screw into the piston, with some sort of sealing compound to prevent the rod from vibrating loose. Examine where the rod meets the piston to be sure that it has not been tack welded. Weigh the cost of a new rod against the cost of replacing the whole cylinder to see which course of action is the right one for you.

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