Abstract: An earth moving and land grading machine includes a frame and road wheels mounted on the frame, with a forwardly directed device for permitting connection to a prime mover. The frame has a bin for receiving material. A rear wall is movable between a first position, in which the bin is substantially open for receiving material therein, to a second, forward position during movement for delivering the material from the bin. Movement of the rear wall between the first position and the second, forward position is via a hydraulic ram having a piston. The piston has an outer end that moves along a fixed path and is pivotally connected to an arm partway along a length thereof, so that portions of the arm on each side of the pivotable connection have unequal lengths. A first length of the unequal arm lengths has a longer length and is connected to the rear wall and the second length of the unequal arm lengths has a shorter length and is connected to the earth moving and land grading machine.