Does anyone know anything about hydraulic floor jacks. I looked at this one I got for free and I can't figure out what it's problem is. You can raise the jack roughly 2 strokes before the it stops working full stroke. After 5 strokes total you can't get it any higher. I have filled the fluid and I have cycled it 8 or 9 times each time refilling the fluid after. It is Hein Warner (sp) and is a pretty robust jack. I just need to get it working.