Abstract: A blade assembly is adapted to be connected to the conventional three-point hitch of a farm tractor. A generally horizontal boom pivotally carries at its rear end a blade bucket which is swingable by means of a pair of double-action hydraulic jacks pivoted to the blade and to the boom. The front end of the boom is adapted to be pivotally connected to the pair of laterally-spaced hitch lever arms of the tractor hitch system. A spacer frame upstands from and is pivotally connected to the front ends of the boom. A central lever arm is pivotally connected intermediate its ends to the upper portion of the spacer frame. A central link pivotally interconnects the front end of said central lever arm with the front portion of the boom. A double-acting hydraulic jack interconnects the boom with the pivotal connection between the central lever arm and the link.