How do you use hydaulic levelers?

dieharder wrote:
Check your fluid level. If the fluid is low, the jack could still extract but might not provide much strength.

While it's certainly always a good idea to check your hydraulic fluid, unfortunately, that's not quite how hydraulics work. The fluid being pumped into the jacks is what is extending the jacks. If the system were to run low on fluid, the hydraulic pump would have no fluid to pump to the jacks to make them extend. They would only go so far, until the pump ran out of fluid to pump, then stop extending. At that point, the pump would most likely start making some pretty awful noises as it starts to run dry. The worst thing to do to a hydraulic pump is to run it out of fluid.