Abstract: A roadway pavement planing machine comprising a frame having forward and rearward ends, a pair of crawler drive assemblies disposed in side by side relation at the frame forward end upon which the frame forward end rests, with such drive assemblies being connected to the frame for independent vertical adjustment of said frame relative to the respective forward drive assemblies, a drive assembly adjacent the frame rearward end on which the frame rearward end rests and comprising a pair of crawler type drive assemblies. The rearward end drive assembly as a whole is connected to the machine frame for movement of the frame about a horizontal axis extending longitudinally of the frame.

Abstract: An automatic control system for a backhoe utilizing a bucket at the end of a rigid boom is disclosed herein. The automatic control system includes an actuator cooperating with a control valve that controls the flow of fluid to hydraulic rams that pivot the boom. The control system also includes position indicating means between the boom and the frame and a manually settable control element both of which produce output signals that are combined and activate the actuator so that the implement is moved at a rate which corresponds to the differences between the respective signals.