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Remember that the rod should always be carefully inspected to determine if it is bent or if the surface is scratched. If the rod is bent, it either needs to be straightened or a new one needs to be fabricated. If the piston seal is eroded, misshapen, or missing, then there is an issue with the tube that likely requires replacement. 

The rod seal should also be checked for distortion, which normally is a sign of a bent rod or a worn-out guide bushing. If the inside of the tube is scratched, scored, or pitted, it will need to be honed or, if the damage is too deep into the surface, replaced.

If a leak is present and there seem to be no problems with the shaft or cylinder fore, then the issue is likely a damaged seal. However, keep in mind that scratches and gouges on the surface where the seal is installed against or upon which it rests can lead to leaks as well. And when seals are installed, they must be handled carefully. 

The hydraulic cylinder repair process involves attention to detail and careful visual inspection — both of which often require several years of experience to master. The majority of repairs, such as honing tubes and fabricating rods, are best performed by professionals like our hydraulic manufacturing company. In addition, professionals have the skill to troubleshoot the root cause of the damage so that it can be addressed.