A method for adjusting an orientation angle of an agricultural implement includes 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. 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 agricultural machine includes a controller disposed in communication with a implement linkage system, an output, and an input. The controller is operable to identify a selected work implement from a plurality of different work implements. A desired operating condition is then solicited from an operator via the output. A selection command is received from the operator via the input indicating which of a float operating condition and a fixed height operating condition is the desired operating condition. The controller may then automatically determine a recommended operating setting for the implement linkage system for the selected work implement and the desired operating condition and notify the operator of the recommended operating setting for the implement linkage system for the selected work implement and the desired operating condition via the output.

An agricultural machine includes a float cylinder interconnecting a header linkage system and a frame. A rod side accumulator is in fluid communication with a rod side fluid port of the float cylinder. A float control valve is selectively controllable between an open position allowing fluid communication between a pressure source and the rod side accumulator, and a closed position blocking fluid communication between the pressure source and the rod side accumulator. A downforce accumulator is in fluid communication with a piston side fluid port of the float cylinder. A downforce control valve controls fluid communication between the pressure source and the downforce accumulator. A downforce return valve controls fluid communication between the downforce accumulator and the tank.

A work vehicle includes a mower connected to an abdomen of a running machine body via lifting links, a lifting interlocking link mechanism provided below the machine body for moving the mower up/down, and a link stopper connected to an adjustment dial and acting on the lifting interlocking link mechanism to change a cutting height of the mower. The adjustment dial is arranged on a seat support panel that supports an operator seat, and the link stopper, connected to the adjustment dial by a wire, is arranged below the machine body. A lifting lever for raising/lowering the mower is provided on one side of the left and right sides of the machine body, and a parking lever is arranged on the seat support panel on the other side. The adjustment dial is arranged between the parking lever and fenders covering rear wheels.

A work vehicle includes a mower connected to an abdomen of a running machine body via lifting links, a lifting interlocking link mechanism provided below the machine body for moving the mower up/down, and a link stopper connected to an adjustment dial and acting on the lifting interlocking link mechanism to change a cutting height of the mower. The adjustment dial is arranged on a seat support panel that supports an operator seat, and the link stopper, connected to the adjustment dial by a wire, is arranged below the machine body. A lifting lever for raising/lowering the mower is provided on one side of the left and right sides of the machine body, and a parking lever is arranged on the seat support panel on the other side. The adjustment dial is arranged between the parking lever and fenders covering rear wheels.

A lift arm lifting and lowering mechanism cylinder case provided with a cylinder portion into which oil is fed, a piston slidable inside the cylinder portion to define a hydraulic chamber and receiving hydraulic pressure of the hydraulic chamber on a front surface, a safety valve provided to the piston to discharge the oil inside the hydraulic chamber to the outside when the hydraulic pressure of the hydraulic chamber becomes greater than or equal to a predetermined value, and a lift arm supported by the cylinder case and rotatable in conjunction with movement of the piston, in which the piston includes an oil passage allowing communication between a rear surface of the piston and the front surface, and the oil passage includes a containing portion provided to open on the axially front surface side and capable of containing the safety valve, and a non-containing portion provided on the axially rear surface side relative to the containing portion and incapable of containing the safety valve.

A hydraulic system for an agricultural system includes a hydraulic circuit and a bi-directional filter disposed on a bi-directional fluid line of the hydraulic circuit. The bi-directional filter includes a check valve fluid line having a check valve configured to block a fluid from flowing through the check valve fluid line in a first direction and to enable the fluid to flow through the check valve fluid line in a second direction, opposite the first direction, and a filter fluid line having a filter configured to enable the fluid to flow through the filter fluid line in the first direction and the second direction. The filter is configured to block particles that are greater than a threshold size from passing through the filter fluid line, and the filter fluid line is in a parallel flow configuration with respect to the check valve fluid line.

A header assembly for an agricultural harvesting machine having a traction unit comprises a cutter, a main frame that supports the cutter, a float cylinder configured to be coupled between the main frame and the traction unit, an accumulator, and fluidic circuitry that fluidically couples the accumulator to the float cylinder. The fluidic circuitry is configured to provide a first flow of pressurized fluid under pressure to the float cylinder, so the float cylinder exerts a float force on the main frame, and, based on a control input that corresponds to a lifting operation of the header assembly, provide a restricted flow of fluid, that is restricted relative to the first flow, between the float cylinder and the accumulator.

A header assembly for an agricultural harvesting machine having a traction unit comprises a cutter, a main frame that supports the cutter, a float cylinder configured to be coupled between the main frame and the traction unit, an accumulator, and fluidic circuitry that fluidically couples the accumulator to the float cylinder. The fluidic circuitry is configured to provide a first flow of pressurized fluid under pressure to the float cylinder, so the float cylinder exerts a float force on the main frame, and, based on a control input that corresponds to a lifting operation of the header assembly, provide a restricted flow of fluid, that is restricted relative to the first flow, between the float cylinder and the accumulator.

An agricultural harvester includes a controller configured to receive at least one wing angle signal indicative of an angle at least one wing with respect to a center section of a header. The controller is also configured to receive a wing height position signal indicative of a distance between the at least one wing and a soil surface, determine whether the angle of the at least one wing exceeds an angle limit threshold based at least in part on the wing angle signal, and output a tilt signal to a tilt actuator in response to determining the angle of the wing exceeds the angle limit threshold. The tilt signal is indicative of instructions to maintain the distance between the at least one wing and the soil surface within a target distance threshold.