The tub is mounted to a frame for alternative movement from a position wherein the tub is centrally located with respect to the longitudinal axis of the frame. The tub may be tilted from a position centrally located to a side dump position which is offset with respect to the longitudinal axis of the frame. The apparatus for moving the tub from its centrally located position to its side dump position is a barrel pivotally mounted to the tub and an extension rod which is pivotally mounted to the frame.