A pallet jack that does not lift has airA pallet jack that does not lift has air inside the hydraulic system. The reason air gets inside is often due to a bad O-ring at the valve cartridge. An inspection of the hydraulic system near the bottom of the handle often shows signs of a fluid leak. To fix a pallet jack that won't lift requires replacing the O-ring ...2019.09.26 02:50Fine Mist Sprayers Manufacture