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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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