Apparatus on the back of a tractor carries an adjustable shear blade frame. This frame may be inclined upward or downward from horizontal to cut off trees at ground level and parallel with an inclined ground surface. The frame may be side shifted to receive the trunk of a tree to be felled when the tractor is not backed to a precise position adjacent the tree. The frame may be removed from the apparatus for felling trees at a distance from the tractor. The frame may be turned upright and side shifted to cut to desired lengths the trunks of felled trees pulled alongside the tractor. The frame is also equipped for splitting short lengths of the tree trunks into firewood.