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Old 12-18-2013, 20:39   #1 (permalink)
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Hydraulic floor jack won't maintain height

This a general question about my hydraulic floor jack - I have one of those steel framed 2 ton jacks that every hardware or auto store sells. I've had this jack for several years.
After locking the fluid valve and jacking up the vehicle, the jack slowly comes back down under load. I'm guessing there is some kind of check ball or valve that isn't fully seating. Also, in cold weather it doesn't give me a full piston when I pump the handle. The owner's manual on another jack I have said the fluid is dirty. The jack doesn't leak that I know of, and I think it's full of fluid, since I have topped it off before.
Thanks.
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Old 12-19-2013, 07:07   #2 (permalink)
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Re: Hydraulic floor jack won't maintain height

How would/could the fluid get dirty?

I have an old big, heavy cast iron one I bought in the seventies at Montgomery Wards. The check valve would be in the pump assembly/fluid tank.

I've had a bad leak years ago from the pump and got parts from a local hydraulic repair company. A friend at work that use to work sent me there, I mentioned his name and got the parts for free! I get a few drips every time I use lately.

The worst part was the pump assemble just screws in. A large hex, very thin and sits in a pocket. It's a few inches long but no deep well would work so I bought the cheapest deep well I could find, cut it in half and welded a section of pipe in. Special tool now!
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'09 Ford Escape Limited, V6, 4WD
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