A combination is made up of a tractor and a seeder suitable for direct drilling mounted on a three-point hitch of the tractor. The seeder has a crossbeam that is connected to the three-point hitch and on which a plurality of sowing units are arranged laterally in succession. The sowing units, each equipped with at least one furrow opener, are respectively prestressed downward in relation to the crossbeam by an actuator, and the three-point hitch can be self-locked in relation to a chassis of the tractor. During the sowing operation, the pressing forces for the furrow openers are therefore introduced via the sowing units, the actuator, the crossbeam and the three-point hitch into the chassis of the tractor.

An agricultural tractor mounting assembly comprising a toolbar engaged with a first implement engaging a soil subsurface and also equipped with a carrying tool for engaging another implement. The carrying tool may include hydraulic cylinders and hydraulic charged accumulators which lift, suspend, and support implements behind a toolbar engaged to a tractor. The implement engaging the soil and the carrier tool may be engaged to the toolbar of the tractor mounting assembly which is engaged to the tractor.

A suspended axle for a tractor, the axle having a lower link mechanism selectively operable between a first configuration in which the lower links are in fixed relation to the suspended axle and a second configuration in which the lower links are isolated from the suspended axle.

In one embodiment, a hitch system, comprising: an upper support structure comprising a first pivot mount at one end of the upper support structure and a second pivot mount at the other end of the upper support structure; a lower structural assembly comprising a base having a third pivot mount at one end of the base and a fourth pivot mount at the other end of the base, the lower structural assembly further comprising first and second lift arms pivotably connected respectively to the third and fourth pivot mounts; and first and second actuators each comprising a retractable member and independently operable, the first actuator pivotably connected at one end of the first actuator to the first pivot mount and pivotably connected at the other end of the first actuator to the first lift arm, the second actuator pivotably connected at one end of the second actuator to the second pivot mount and pivotably connected at the other end of the second actuator to the second lift arm.

An agricultural machine has a linkage system for hitching of an implement and an additional axle mounted to the linkage system. The linkage system includes at least one lift arm adjustably mounted to the chassis at an inner end and carrying a fastening device at an outer end. The additional axle is connected to at least one lift arm inboard of the fastening device. The linkage assembly may be a three-point linkage assembly having two lower lift arms, the additional axle being mounted between the lower lift arms.

A hydraulic system for a three-point hitch includes at least one hitch cylinder and a first flow path. The hydraulic system includes a hitch valve fluidly coupled to the at least one hitch cylinder via the first flow path, wherein the hitch valve is configured to control a flow of hydraulic fluid to the at least one hitch cylinder. The hydraulic system includes a second flow path fluidly coupled to the first flow path at a first location between the at least one hitch cylinder and the hitch valve, wherein the second flow path is fluidly coupled to a reservoir for the hydraulic fluid. The hydraulic system includes a first check valve disposed along the second flow path between the first flow path and the reservoir, wherein the first check valve is configured to keep air from entering the hydraulic system via the second flow path from the reservoir.

An agricultural system which comprises a propulsion unit that comprises at least one, generally longitudinally extending, lift arm. The system also comprises a generally transversely extending implement comprising a generally transversely extending main frame. The implement may be a swather header. A mounting apparatus connects the at least one lift arm to the implement. The mounting apparatus includes a moveable member configured to interconnect the at least one lift arm and the implement and is movable relative to the implement between a first position proximal to the propulsion unit when the propulsion unit is in a mounting ready configuration and a second position distal to the propulsion unit when the propulsion unit is in a mounting ready configuration. The moveable member is lockable in the second position.