How Does a JUNG Hydraulic Jack Work?

How exactly is lifting force created inside of a hydraulic jack? This video will demonstrate the physics behind hydraulic power and how this mechanism is used in JUNG brand toe jacks. Each time the handle is pumped, oil is pushed from the reservoir tank through a small pipe and into the chamber beneath the piston. As the oil leaves the tank it will create a vacuum, so a small valve lets air in to fill that empty space and keep things moving smoothly. The piston is situated tightly inside of a metal cylinder so that it can only travel up and down. As oil volume builds up in the chamber underneath, the resulting pressure forces the piston upward. This in turn raises the outer sleeve which has an attachable toe to hold onto and lift the load. The total lifting capacity depends on the total surface area shared between the oil and the piston. Think of it this way: a smaller surface area is like one hand pushing, while a larger surface area is like many hands. Naturally, as lifting power goes up, the jacks must be larger and tougher to handle the additional force. This means a higher-capacity jack has a much larger chamber to fill. To lift the load one inch, you may need to pump twice as often with a 20-ton model as compared to using one at 10-tons. You’re essentially trading speed for raw lifting force. When you want to bring the toe back down, simply loosen the lowering knob on the top of the tank. This will open a hole in the line, letting the oil drain back into the tank, emptying the piston chamber and thus lowering the toe and the load. For more information visit us at Toolwell.com