You can get special 'jack oil', but any hydraulic oil, TDH fluid, or even ATF will do just fine. A lot of the newer jacks don't have a fill plug. Or if they do, it's a pressed-in plug that's not meant to be removed. You can usually knock them out with a chisel to fill up and goop them back in-place with some hardening gasket maker - they're on the low-pressure side of the jack so doesn't need to hold any pressure. Just be careful: if fluid leaked out before, it will leak out again. Probably only a very slow leak - just don't rely on it to hold a load overnight (or over your head without additional blocking). Usually the seals start leaking when the rod gets a little scarred/pitted/rusty - usually from the jack being left partially extended. The rods on a lot of bottle jacks aren't chromed, so they rust when left extended. Then when they're retracted, that little bit of surface rusts cuts up the seals just a little.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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