A tractor includes a three-point link mechanism to which a work apparatus to be attached so as to be able to move upward and downward, a hydraulic drive to perform a swing operation to swing the three-point link mechanism, a load receiver to swing in response to a tow load being applied from the work apparatus when the work apparatus performs ground work while being towed by the vehicle body, and a link mechanism to transmit an amount of operation for the swing operation to the hydraulic drive according to an amount of swing of the load receiver. The link mechanism includes, at a most upstream position, an interlocking swing arm to swing in conjunction with the swing of the load receiver about a swing axis that is different from a swing axis of the load receiver, the load receiver includes a first portion to press the interlocking swing arm that includes a second portion contactable with the first portion so to be pressed by the first portion, and a contact position of the first and the second portions.

A tractor includes a three-point link mechanism to which a work apparatus to be attached so as to be able to move upward and downward, a hydraulic drive to perform a swing operation to swing the three-point link mechanism, a load receiver to swing in response to a tow load being applied from the work apparatus when the work apparatus performs ground work while being towed by the vehicle body, and a link mechanism to transmit an amount of operation for the swing operation to the hydraulic drive according to an amount of swing of the load receiver. The link mechanism includes, at a most upstream position, an interlocking swing arm to swing in conjunction with the swing of the load receiver about a swing axis that is different from a swing axis of the load receiver, the load receiver includes a first portion to press the interlocking swing arm that includes a second portion contactable with the first portion so to be pressed by the first portion, and a contact position of the first and the second portions.

A method is provided for controlling the operation of an attachment that is coupled to a tractor via a top link and two bottom links of a powerlift. The method includes selecting a point of action from at least one of a pull point as a geometric intersection of imaginary extensions of both bottom links and a pole point as a geometric intersection of imaginary extensions of the top link and a bottom link. The method also includes determining a position of the selected point of action, and signaling the determined position of the point of action by a display unit or adjusting the determined position depending on a comparison with a setpoint setting.

A method is provided for controlling the operation of an attachment that is coupled to a tractor via a top link and two bottom links of a powerlift. The method includes selecting a point of action from at least one of a pull point as a geometric intersection of imaginary extensions of both bottom links and a pole point as a geometric intersection of imaginary extensions of the top link and a bottom link. The method also includes determining a position of the selected point of action, and signaling the determined position of the point of action by a display unit or adjusting the determined position depending on a comparison with a setpoint setting.

The invention relates to lifting and adjusting devices for agricultural equipment. The attachment system includes a mounting frame with fastening means for its attachment to the vehicle, and an implement bearing frame capable of vertical movement relative to the mounting frame under the action of lifting devices fixed on the sides of the mounting frame; and a framework located in front of the agricultural implement for installing at least one safety device. By all the design features of the invention, the attachment system enhances the operational efficiency of agricultural equipment by reducing the probability of its damage at obstacle collision, improving operator safety, and preserving the environment.

A towed agricultural implement including a main chassis member, a moveable arm for carrying at least one working implement located to each side of the main chassis member, each moveable arm being moveable between a working position and a transport position, the main chassis member having a support device for attachment to a towing vehicle, the support device having left and right lower attachment points for attaching to lower mounting points of a three point hitch of a towing vehicle and a central upper attachment point for attaching to the upper mounting point of the three point hitch, in which each left and right attachment point is mounted on an articulated arm connected to the main chassis member, the main chassis member further including a regulating control apparatus to secure and release a free end of each articulated arm in an operative position. This construction has as an advantage that on encountering an obstacle the articulated arm can be released allowing the working implement to move away from the obstacle.

A control system for an implement hitch of an agricultural vehicle, wherein the hitch is mounted to the vehicle and includes one or more hydraulic cylinders or other actuators operable to raise and lower the hitch between minimum and maximum heights relative to the vehicle and hold the hitch static at one or more heights between the minimum and maximum heights. The control system includes a rocker control device having a first operating position and being movable in a first direction to a first limit position and in a second direction to a second limit position. An electronic control unit (ECU) is connected to the rocker control device and controls operation of the or each of the hydraulic cylinders or actuators and thereby control raising and lowering of the hitch in response to user operation of the rocker control device. The ECU is operable to control raising and lowering of the hitch to move it to a selected one of two or more previously stored positions between the said minimum and maximum heights, and to switch between the said previously stored positions in response to a predetermined first actuation operation of the same rocker control device. Preferably, the same rocker control device is used to control the input and storage of at least one further height value.

A control system for an implement hitch of an agricultural vehicle, wherein the hitch is mounted to the vehicle and includes one or more hydraulic cylinders or other actuators operable to raise and lower the hitch between minimum and maximum heights relative to the vehicle and hold the hitch static at one or more heights between the minimum and maximum heights. The control system includes a rocker control device having a first operating position and being movable in a first direction to a first limit position and in a second direction to a second limit position. An electronic control unit connected to the rocker control device is configured to control operation of the or each of the hydraulic cylinders or actuators and thereby control raising and lowering of the hitch in response to user operation of the rocker control device. The ECU is operable to control raising and lowering of the hitch according to one of two or more control modes, and to switch between said control modes in response to a predetermined first actuation operation of the same rocker control device.

A golf course implement lift system includes a global positioning system for mapping a plurality of obstacles on a golf course, and an electro-hydraulic three point hitch with a towed implement attached thereto. The electro-hydraulic three point hitch is raised when the global positioning system detects the towed implement is approaching one of the plurality of obstacles.

A golf course implement lift system includes a global positioning system for mapping a plurality of obstacles on a golf course, and an electro-hydraulic three point hitch with a towed implement attached thereto. The electro-hydraulic three point hitch is raised when the global positioning system detects the towed implement is approaching one of the plurality of obstacles.