the invention relates to a civil engineering loading machine provided with a frame and working equipment which comprises at least one arm , an arm actuator for rotatably displacing said arm with respect to the frame , a working tool hingable with respect to the arm , a main cinematic chain forming together with the working tool part and the arm part a main deformable mechanism and a controllable tool actuator for generating the deformation of the main deformable mechanism in such a way that the inclination angle of the working tool with respect to the arm is provided . the inventive machine is characterized in that it also comprises a secondary cinematic chain forming together with the part of the arm , which is located in the area of articulation thereof on the frame , a deformable reference mechanism whose deformation directly corresponds to the inclination angle of the working tool with respect to the frame , an angle sensor for measuring an angle displaying the deformation of the reference mechanism with respect to the frame and a control device which is connected to said sensor and controls the feeding of the working tool actuator and / or the arm actuator .