CONSTRUCTION MACHINERY

Provided is construction machinery that can detect in real time during work that an excess flow control valve is stuck open without decreasing the speed of work. The construction machinery is providedwith: an excess flow control valve control unit that outputs a close command to an excess flow control valve when starting an operation for which a control input signal from an operation lever deviceis detected; a pump discharge control unit that outputs a discharge flow command to a regulator for an open circuit pump; an assist valve control unit that continues output of the previous close command to an assist valve; a stuck detection determination unit that compares a pressure signal and a preset threshold value, determines that the excess flow control valve is stuck open if the pressure signal is less than the threshold value, and determines that the excess flow control valve is normal if the pressure signal exceeds the threshold value; and a stop signal generation unit to which a stuck determination signal is