A control arrangement for an arrangement of hydraulically couplable machines has an interface for hydraulic coupling of the machines, and a hydraulic machine for supplying pressure medium to at least one hydraulic consumer of the machines in accordance with requirements. An electronic control device is configured, in accordance with a load of the consumer, to generate an electronic control signal, which can be converted by a transducer of the control arrangement into a hydraulic control signal, in accordance with which the hydraulic machine can be operated.

A subsoil tool for ameliorating soil compaction having a shank attached to a toolbar of a tractor, wings on forward wing links pivotally engaged to the shank, and following wings on a wing rod pivotally engaged with the forward wing link. The forward wing links are positioned near the bottom of the shank in front of the rear of the shank. The wing rod is positioned behind the shank. A drive box having a hydraulic cylinder is engaged to the toolbar and pivotally engaged with the wing rod. In use, a portion of the subsoil tool may be inserted below a surface of the soil, the height of the subsoil tool may be adjusted, the subsoil tool may be rotated, and the hydraulic cylinder may be cycled to move the forward wings and following wings.

A subsoil tool for ameliorating soil compaction having a shank attached to a toolbar of a tractor, wings on forward wing links pivotally engaged to the shank, and following wings on a wing rod pivotally engaged with the forward wing link. The forward wing links are positioned near the bottom of the shank in front of the rear of the shank. The wing rod is positioned behind the shank. A drive box having a hydraulic cylinder is engaged to the toolbar and pivotally engaged with the wing rod. In use, a portion of the subsoil tool may be inserted below a surface of the soil, the height of the subsoil tool may be adjusted, the subsoil tool may be rotated, and the hydraulic cylinder may be cycled to move the forward wings and following wings.

An autonomous agricultural system comprising an implement configured to perform an agricultural operation. The system additionally comprises an autonomous power unit for autonomously propelling the implement. The system further comprises a coupling assembly configured to connect the implement to the power unit. The coupling assembly provides at least six degrees of freedom of movement between the implement and the power unit.

An autonomous agricultural system comprising an implement configured to perform an agricultural operation. The system additionally comprises an autonomous power unit for autonomously propelling the implement. The system further comprises a coupling assembly configured to connect the implement to the power unit. The coupling assembly provides at least six degrees of freedom of movement between the implement and the power unit.

A hydraulic or electric de-thatcher power lift assembly attachment that provides control while de-thatching because it is stable and efficient and can be lifted with ease at any time when dealing with difficult terrain. In an example embodiment, the hydraulic version fits hydraulic equipped tractors. In an alternative embodiment, the device may be used with an electric motor from the tractor, or can have its own dedicated battery for power. A hydraulic or electric lift assembly is also provided for a lawn aerator. The various attachments are designed to replace the standard manual lift lever on standard aerators. The attachments can be used on tractors that have hydraulics built into the tractor or on tractors with an electric motor.

A hydraulic or electric de-thatcher power lift assembly attachment that provides control while de-thatching because it is stable and efficient and can be lifted with ease at any time when dealing with difficult terrain. In an example embodiment, the hydraulic version fits hydraulic equipped tractors. In an alternative embodiment, the device may be used with an electric motor from the tractor, or can have its own dedicated battery for power. A hydraulic or electric lift assembly is also provided for a lawn aerator. The various attachments are designed to replace the standard manual lift lever on standard aerators. The attachments can be used on tractors that have hydraulics built into the tractor or on tractors with an electric motor.

The disclosure relates to a method for adjusting an orientation angle of an agricultural implement. The method comprising arranging a hitch such that an upper link and at least one lower link is articulated to a support structure of the utility vehicle; and adjusting the orientation angle based on a target length of the upper link, wherein the target length of the upper link is determined as a function of the orientation angle and as a function of a lower link angle.

An inner oil passage (45) is formed inside a slidable spool (22). The slidable spool (22) defines, in its circumferential face, a first opening (46), a second opening (47) and a third opening (48). The first opening (46), the second opening (47) and the third opening (48) are communicated to the inner oil passage (45). When the slidable spool (22) is switched to a floating position (F), the first the first opening (46) is aligned with a first port end portion (25a), the second opening (47) is aligned with a second port end portion (26a), and the third opening (48) is aligned with a fourth port end portion (24a), respectively, and a first cylinder port and a second cylinder port are communicated to a tank port (24) via the inner oil passage (45).

An agricultural work vehicle according to an aspect of the present invention, which can adaptively adjust the velocity profile of the hitch according to the weight of the work machine, is characterized by comprising: a hitch on which an work machine is mounted; a weight calculation unit that calculates the weight of the work machine when the work machine is lifted following a first lift of the hitch; and a hitch controller that firstly lifts the hitch according to a reference velocity profile comprising a constant-velocity section (T) and, when calculation of the weight of the work machine is completed, generates an updated velocity profile comprising acceleration sections (a1, a2), constant-velocity sections (b1, b2), and deceleration sections (c1, c1) according to the weight of the work machine, and secondly lifts the hitch according to the updated velocity profile.