No, rod packing can not be replaced with O-rings. The rod packing, typically, is going to be a lip type seal. The most common type on the older machines was a multi piece Chevron type V packing and the "newer" stuff usually uses a single "polypack" type. Both use both the interference fit of the lip as well as the hydraulic pressure in the cylinder to force the lip against the rod causing it to seal. An O-ring has no way to provide the type of high pressure seal needed in this type of application.
As for the pits on the rod I can only say this without actually seeing it. I"ve seen new cylinders get dented, scratched, etc on their firs day on the job and have also seen cylinders with numerous pist, scratches, etc run alot of years with no real problems. True your gonna get "premature" wear on the seal and a bit of leakage but unless there is a massive amount of deep pits, scores, etc they probably aren"t worth worrying about. The worst thing you can have on a cylinder is a scratch running length wise of the rod or running around the circumference of the rod. The length wise one will let fluid run right under the seal and the other will allow the lip of the seal to drop into it so the movement of the rod pull"s at it, and eventually cuts it.
Like I said a number of small pits spread out over the length of the rod will allow minor amount of leakage over time and you won"t get the "full life" out of the seal but beyond that there"s no reason you can"t use a lightly pitted rod. If you want absolutely zero leakage then a new rod is your only choice.
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