A method for determining a mass of an implement attached to a vehicle includes providing a powerlift having at least one upper link and one lower link, a support structure, and the implement. The method also includes defining an angle (ψ) between the upper link and a vehicle horizontal line, an angle (φ) between the lower link and a vehicle horizontal line, an angle of inclination (θ) of a vehicle horizontal line relative to a terrestrial horizontal line, a path (AK) that represents a connection along the lower link between the support structure and the implement, and a force (F.sub.E) impinging on a connection between the upper link and the implement and acting along the upper link. The mass is determined as a function of at least one of the angle (ψ), the angle (φ), the angle of inclination (θ), the path (AK), and the force (F.sub.E).

Systems, methods and apparatus are provided for managing implement weight. In some embodiments, a position sensor is used to determine a position of the wing section and a downforce applied to the wing is modified in order to lower the wing section. In some embodiments, the position sensor indicates the position of a wing wheel assembly of the wing section. In other embodiments, the position sensor indicates the position of a center wheel assembly of a center section of the implement.

Systems, methods and apparatus are provided for managing implement weight. In some embodiments, a position sensor is used to determine a position of the wing section and a downforce applied to the wing is modified in order to lower the wing section. In some embodiments, the position sensor indicates the position of a wing wheel assembly of the wing section. In other embodiments, the position sensor indicates the position of a center wheel assembly of a center section of the implement.

A slip control system for an off-road vehicle includes a control system configured to output a signal indicative of a first action if a magnitude of slippage of the off-road vehicle relative to a soil surface is greater than a first threshold value and less than or equal to a second threshold value. Furthermore, the control system is configured to output a signal indicative of a second action, different than the first action, if the magnitude of slippage is greater than the second threshold value.

A slip control system for an off-road vehicle includes a control system configured to output a signal indicative of a first action if a magnitude of slippage of the off-road vehicle relative to a soil surface is greater than a first threshold value and less than or equal to a second threshold value. Furthermore, the control system is configured to output a signal indicative of a second action, different than the first action, if the magnitude of slippage is greater than the second threshold value.

A tractor includes: a three-point linkage to which a tiller is mountable a hydraulic lifting/lowering driver to lift and lower the three-point linkage, and a mechanical linkage to transmit a lifting/lowering operation amount of the three-point linkage to the lifting/lowering driver. The mechanical linkage includes a load detector to detect an amount of change in traction load via the three-point linkage, a cable to interlock according to the amount of change in the traction load detected by the load detector, and a mechanical linkage interlocked and connected to the cable and the lifting/lowering driver, the mechanical linkage being capable of transmitting the lifting/lowering operation amount according to the amount of change in the traction load to the lifting/lowering driver.

A soil measure, such as a soil cone index, and a vehicle index indicating the amount of force the vehicle exerts on the ground as it travels over the ground, are obtained and compared to identify a soil damage score. The soil damage score can be mapped over a field and an agricultural vehicle can be controlled based upon the soil damage score.

A front mower for mounting on a front three point linkage of a tractor to be operated for cutting vegetation, such as grass, in front of the tractor, the mower comprising: (i) a headstock for mounting on the front three point linkage of the tractor; (ii) a mowing head comprising an array of cutting heads for cutting vegetation such as grass, mounted on and moveable relative to the headstock to follow the contours of the ground over which the mower is passing; (iii) a mounting mechanism mounting the mowing head to the headstock, wherein the mounting mechanism comprises a cutting angle adjustment mechanism comprising an arc shaped guide and a follower for the arc shaped guide, the follower being moveable back and forth along the arc shaped guide, so that the cutting angle adjustment mechanism allows the mowing head to move back and forth along an arc defined by the guide and relative to the headstock so as to vary the cutting angle of the cutting heads. This allows for free movement of the mowing head to follow the contours of the ground.

A front mower for mounting on a front three point linkage of a tractor to be operated for cutting vegetation, such as grass, in front of the tractor, the mower comprising: (i) a headstock for mounting on the front three point linkage of the tractor; (ii) a mowing head comprising an array of cutting heads for cutting vegetation such as grass, mounted on and moveable relative to the headstock to follow the contours of the ground over which the mower is passing; (iii) a mounting mechanism mounting the mowing head to the headstock, wherein the mounting mechanism comprises a cutting angle adjustment mechanism comprising an arc shaped guide and a follower for the arc shaped guide, the follower being moveable back and forth along the arc shaped guide, so that the cutting angle adjustment mechanism allows the mowing head to move back and forth along an arc defined by the guide and relative to the headstock so as to vary the cutting angle of the cutting heads. This allows for free movement of the mowing head to follow the contours of the ground.

The invention relates to an agricultural machine intended to be coupled to a tractor vehicle and comprising a work unit connected to a chassis relative to which the work unit can be moved, the machine being able to take up a work configuration in which the work unit rests at least partially on the ground and a transport configuration in which the work unit is raised from the ground. The machine comprises a lightening device having at least one lightening cylinder connected to the chassis on one side and to the work unit on the other side, the lightening cylinder being able to transfer, in the work configuration, at least some of the weight of the work unit onto the chassis.