My hydraulic low-profile car jack stopped working today.  The ram/arm would not advance when there was any pre-load on the jack.  I haven’t used the jack in a while so maybe it lost oil/pressure somehow.

Solutions

I did some research on common maintenance problems and this seems to be the case.  Fortunately tools come with FAQ – So here is screenshot of some helpful solutions.

Check out Wikipedia definition of hydraulic oil – http://en.wikipedia.org/wiki/Hydraulic_oil