Reply to thread

Message: <blockquote data-quote="weendoggy" data-source="post: 1587495" data-attributes="member: 23340"><p>Most bottle jacks have the reservior at the bottom and use it to fill/pump when activated. Once you allow air to enter...well, let's just say it won't pump, or it pumps but not much happens. Much like a floor jack on it's side trying to work. Sometimes you can pursuade at a tilt to make it work, but it's a gamble. A porta-power has a pump/reservior separate from the piston piece so it can stay somewhat level. We tried this a bunch of times in the field when trying to change big loader tires (way back when) and sometimes we got lucky on an angle, but never horizontal. To test, you can just get your bottle jack out, lay it on it's side and try to pump. It'll work for a bit then quit as you try to expand the piston, and, you can put hand pressure to stop it.</p></blockquote><p></p>