How to repair a floor jack that leaks fluid

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UPDATED VERSION HERE:
This video will show you the most common way to repair a floor jack that is leaking fluid and thus won’t lift. I am repairing a 3-ton floor jack, but most jacks are built similar. The O-ring location may be on the male or female side of the piston and the bleeding procedure should be in your owner’s manual or you can do as shown in the video.
NEW… on 10/2/2016 I filmed a new filling & bleeding procedure that worked even faster and got the jack back to 100%…

jack shown in video is Craftsman 875.501152
o-ring here: Источник видео youtube.com/watch?v=pe7NY1Nh6sQ