Abstract: A jack device for supporting and raising grain bins of the type constructed from top to bottom. The jack has an A shaped frame and an outwardly inclined brace leg. Three fixed pulleys and a floating pulley receive a cable that may be taken up by a winch mounted on the frame. The floating pulley is equipped with a hook which engages the bin in a manner to hold it at an elevated position and to raise the bin as the cable is taken up by the winch. The multiple fixed pulley arrangement acts to distribute the forces over the frame to thereby increase the stability of the jack in handling large bins.