Patent ID: 8096382

Claim:
A construction machine having: an engine, a power source drivable by the engine, and plural actuators drivable by power fed from the power source, said actuators including a predetermined actuator, and an exhaust gas treatment system arranged in an exhaust passage from the engine, and comprising a reduction catalyst for reducing and purifying nitrogen oxides in exhaust gas with the reducing agent, a reducing agent storage tank, and a remaining reducing-agent amount detector for detecting a remaining amount of the reducing agent stored in the reducing agent storage tank, characterized in that: the construction machine is provided with an actuator operation control means for performing, when the remaining amount of the reducing agent in the reducing agent storage tank is detected by the remaining reducing-agent amount detector to have become equal to or smaller than a predetermined remaining amount, limiting control to limit an operation of the predetermined actuator such that a load driven by the predetermined actuator becomes difficult to exhibit a function thereof, and at a same time, holding control for holding the at least one other actuator, which is different from the predetermined actuator, operable such that a function of another load driven by the at least one other actuator can be exhibited.