Sounds like a good way to fill with oil. I bleed them by simply pushing the ram back into the cylinder until oil starts coming back out, and reinserting the plug.
If that doesn't help, then I have to ask if you know the history of these jacks. If they've been in the wet, they may have rust inside and need polished. Or they may need rubber seals replaced.
Dad has a big 5-foot-long trolly jack he calls Bertha. He and his dad brought it home from the landfill years and years ago, they sold it to him for 3 cents a pound. Cost $6, so I am under the impression Bertha weighs in at somewhere around 200lbs. I told you all that to say this--it had to be cleaned up and all the seals replaced in it before it would work, but it is an awesome jack.
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Today's Featured Article - Converting from 6 Volt to 12 Volt - by Chris Pratt. It's a common problem for old machines especially when the weather starts to dip below 40 and the tractor isn't fired up as often. You are probably used to the 12 volt Diehard, charged with 200 amp alternator of your 3/4 ton that always is ready and always starts. It's this type of experience that brings about the many queries we get for 12-volt conversion kits. Since only a few kits are available (we sell kits for the
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