Your Harbor Freight Racing Jack may prolong pit stops if it develops air in the hydraulic system. The dual-parallel pump system in the lightweight aluminum jack makes quick work of raising and lowering a vehicle, making it ideal for use by pit crews. Weight capacities ranging from one-and-a-half tons to three tons are available. Bleeding air from the hydraulic piston may remedy such problems as a jack that will not lift its weight capacity, not lift to its full height or a pumping action that feels spongy.
Locate the fill screw on or near the hydraulic cylinder in between the jack lifting arm and the handle socket.
Loosen the fill screw one complete turn in a counterclockwise direction with a flat blade screwdriver.
Insert the jack handle into the handle socket at the rear of the jack. Twist the handle one-half turn in counterclockwise direction, as if you were lowing the jack pad.
Raise and lower the jack handle--as if you were raising the jack pad--several times quickly to expel air from the hydraulic system.
Tighten the fill screw with a flat blade screwdriver. Turn the jack handle in a clockwise direction until tight.
