Abstract: A control unit for controlling the hydraulic system of a construction machine, such as a hydraulic shovel, having a structure capable of being simply and quickly changed from one setup for another setup suitable for a desired mode of control operation. The control unit comprises a control lever pivotally supported for movement in longitudinal and transverse directions, and first and second link rods for transmitting the operating force of the control lever to first and second hydraulic control valves when the control lever is shifted in the longitudinal and transverse directions, respectively. An operating force transmitting member is put on the control lever so as to be rotatable about the axis of the control lever, and a locking member is mounted on the control lever so as to be slidable along the axis of the control lever and so as to be unable to rotate relative to the control lever.

Abstract: A machine for excavating work such as an oil-pressure shovel comprising a boom, an arm, and bucket. The turning shaft for an arm turning device provided on the arm is made capable of turning in the vertical plane including the boom, and this turning shaft is equipped with a turn control device effective for keeping the turning shaft vertical irrespective of the vertical movement of the boom.