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there is a fill point on the cylinder itself, the manual says to keep in an upright position but i just did it on the ground. i thought at first it was either the flat-head cap or the hex-key but those are NOT it!! those are adjustments and the hex-key contains ball-bearings!! (if you have happened to take them off and tip it sideways and the bearings fall out, the smaller bearing goes in first ;) lol ) I also found it easier to put the handle back in, with the jack all the way lowered let the handle drop to the ground, on the cylinder you will see a little "hump", that is the fill spot, it's just a rubber plug painted silver to match the jack. i used a flat-head to pop it off, i just guessed on how much to put in, i think i added a quarter qt bottle, otherwise put the plug back in and test it after adding so much at a time.

(note, it will still jack slow if there is no load (weight) on it, also if it jacks up fine but takes a long time to release or go down, that's a sign of "over-filling"- try to avoid that and empty some out if that happens)

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Q: How do you put hydraulic oil in floor jack?
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