Wheel loader comprising • a front body comprising front wheels and tool positioning means, • a rear body comprising rear wheels and a driver cab, and • an articulated steering joint connecting the front body and the rear body, wherein the tool positioning means comprise hydraulically driven members adapted to hold a levelling tool that is a blade and can be used for land levelling or earthmoving purposes in a working plane, and to adjust a position and orientation of the levelling tool relative to the front body, characterized by the tool positioning means being arranged as Z-kinematics and by the wheel loader further comprising a machine control system for controlling a land levelling or earthmoving process of the wheel loader relative to the working plane, the machine control system comprising a machine control unit and an orientation detection system, wherein • the orientation detection system comprises orientation detection means which are attached to the wheel loader for detecting a position and an orientation of the levelling tool relative to the working plane, wherein the orientation detecting system comprises • at least one angle encoder (31, 32) for measuring, with three rotational degrees of freedom, an angle between the front body and a first member of the tool positioning means, between two members of the tool positioning means and/or between a last member of the tool positioning means and the levelling tool, and • an angle encoder at the articulated steering joint for measuring at least a vertical angle between the front body and the rear body, • the orientation detection means being adapted to generate orientation data according to the relative position and orientation of the levelling tool and to transmit the orientation data to the machine control unit, and • the machine control unit being adapted ▪ to generate and display a graphic representation of the wheel loader and the levelling tool with a position and orientation of the levelling tool relative to the working plane based on the orientation data, and ▪ to automatically operate the tool positioning means for adjusting a vertical distance and a tilt angle of the levelling tool relative to the working plane based on the orientation data. • a front body comprising front wheels and tool positioning means, • a rear body comprising rear wheels and a driver cab, and • an articulated steering joint connecting the front body and the rear body, wherein the tool positioning means comprise hydraulically driven members adapted to hold a levelling tool that is a blade and can be used for land levelling or earthmoving purposes in a working plane, and to adjust a position and orientation of the levelling tool relative to the front body, characterized by the tool positioning means being arranged as Z-kinematics and by the wheel loader further comprising a machine control system for controlling a land levelling or earthmoving process of the wheel loader relative to the working plane, the machine control system comprising a machine control unit and an orientation detection system, wherein • the orientation detection system comprises orientation detection means which are attached to the wheel loader for detecting a position and an orientation of the levelling tool relative to the working plane, wherein the orientation detecting system comprises • at least one angle encoder (31, 32) for measuring, with three rotational degrees of freedom, an angle between the front body and a first member of the tool positioning means, between two members of the tool positioning means and/or between a last member of the tool positioning means and the levelling tool, and • an angle encoder at the articulated steering joint for measuring at least a vertical angle between the front body and the rear body, • at least one angle encoder (31, 32) for measuring, with three rotational degrees of freedom, an angle between the front body and a first member of the tool positioning means, between two members of the tool positioning means and/or between a last member of the tool positioning means and the levelling tool, and • an angle encoder at the articulated steering joint for measuring at least a vertical angle between the front body and the rear body, • the orientation detection means being adapted to generate orientation data according to the relative position and orientation of the levelling tool and to transmit the orientation data to the machine control unit, and • the machine control unit being adapted ▪ to generate and display a graphic representation of the wheel loader and the levelling tool with a position and orientation of the levelling tool relative to the working plane based on the orientation data, and ▪ to automatically operate the tool positioning means for adjusting a vertical distance and a tilt angle of the levelling tool relative to the working plane based on the orientation data. ▪ to generate and display a graphic representation of the wheel loader and the levelling tool with a position and orientation of the levelling tool relative to the working plane based on the orientation data, and ▪ to automatically operate the tool positioning means for adjusting a vertical distance and a tilt angle of the levelling tool relative to the working plane based on the orientation data.