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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