A bent piston rod may be a sign that the hydraulic cylinder is a being overloaded. This may be because the cylinder and associated piston are working outside of their specification - overloaded in other words. It can also be caused by an outside (sideways) impact of some kind - for example a collision.
The first thing to check is the load and whether the cylinder is working within specification, or not, as without this information any repair will not last long. The piston rod can be replaced, but this is also an opportunity to review the specification and upgrade the rod if necessary.
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