One of my jacks had a slight leak and I ran across some advice from Fred Cooper. Here is what he said to do;
I got one of mine (power gear system) to stop leaking with a temporary fix. It was a consistent leak. I could wipe down the exposed ram and then see a small line of fluid slowly running down the ram. This jack had been weeping for a while, but then got worse.
I was ready to remove the jack and take it to a local hydraulic shop for repair, but I needed to make a trip and did not have time to do the repair. Knowing that auto brake fluid will swell gaskets designed for petroleum based fluids, I did the following:
I fully extended the jacks, and wiped down the leaking jack's ram with a clean rag. I then coated the ram (thick coating) with auto brake fluid, and retracted the jack. After letting it sit for 15 minutes, I repeated this process.
We've now made three trips without any leak. If it starts leaking again, then I'll remove and repair.
Obviously, I give no warranty with this repair advice.
Fred & Vicki
Richmond Hill, Ga
2000 H.R.Endeavor/Freightliner/330 Cat
I followed these instructions and it no longer leaks. I'm sure someday I will have to rebuild the cylinder but it has held for several years so far.
Good luck, Bill