Leveling Jacks Making Noise

I should add there are different size jacks. The jack capacity is stamped into the top plate of the jack cylinder. Difficult to see without reaching up, wiping the top clean and using a mirror and flashlight to read the stamping. Our Winne had 8K jacks on the front and 14K on the rear. Interestingly enough, Lippert sent 4 14Ks as replacements. The diameter was slightly bigger but there is nothing in the way to impede installing the bigger jack at all and there was no noticeable difference in operation. The mounts are identical across all jack sizes. I'm sure the fronts now extend a little slower but that is not significant. I would think twice about just having a hydraulic shop replace the seal on the possibility part of the problem might be a bad finish on the inside of the cylinder. I KNOW replacing the jacks with new ones makes the problem go away.