You can take them apart and try to fix them. However new ones are so cheap that it doesn't make sense unless you are curious/stubborn/sentimental etc. Look for seals/kits on eBay, the Web etc.
Below is an old one I took apart recently. Label says ''All Pump Parts are Easily replaceable''. However rod and bore dimensions were odd and I couldn't find a main seal no matter how hard I looked. Actually main seal still looked O.K. and wasn't overly hardened. The jack acted like yours - wouldn't lift a load. Problem wasn't fluid level, did the same thing when filled to spec. I used common tractor trans-hydraulic fluid I see no reason that shouldn't work. Problem might be check valve, release valve, pump seal etc., maybe later I will fool with it some more.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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