A cantilever includes a spar connected rotatably about a rear fixed axis to a fastening device for a vehicle, a tool lever connected rotatably about a front fixed axis to the spar, a deflecting triangle connected rotatably about a central fixed axis to the spar, a rear strut connected rotatably about a first strut pivot axis to the fastening device and rotatably about a second strut pivot axis to the deflecting triangle, a front strut connected rotatably about a third strut pivot axis to the deflecting triangle and rotatably about a fourth strut pivot axis to the tool lever. The rear and the central fixed axis span a first plane. The rear strut intersects the first plane. The central and the front fixed axis span a second plane. The front strut intersects the second plane.

A valve system, including first, second, third and fourth ports, a first flow path connecting the first and second ports, a second flow path connecting the third and fourth ports, with valves connected in the first and second flow paths, and energizable to block the same. A third flow path connects the first and second ports and a fourth flow path connects the third and fourth ports. The third and fourth flow paths are more restricted than the respective first and second flow paths. A fifth flow path connects the first and fourth ports and a sixth flow path connects the second and third ports. When the third and fourth flow paths are open, the first, second, fifth, and sixth flow paths are blocked. When the first and second flow paths are open, the third, fourth, fifth, and sixth flow paths are blocked. When the fifth and sixth flow paths are open, the first, second, third, and fourth, flow paths are blocked.

The present disclosure is directed to a control method for controlling the operation of a lift assembly of a work vehicle, wherein the lift assembly includes an implement and at least one loader arm coupled to the implement. As such, the method may generally include transmitting at least one first command signal in order to simultaneously move the loader arm and the implement towards a return position. The first command signal(s) are associated with moving the loader arms at a movement velocity. The method also includes monitoring a height of the implement relative to a driving surface of the work vehicle during simultaneous movement of the loader arm and the implement. As such, the method may also include reducing the movement velocity of the loader arm when the height is below a predetermined threshold.

A method of controlling a lift arm actuator and a tilt actuator to control positioning of an implement carrier coupled to a lift arm of a power machine. An activation signal is received from an enabling input device. A lift arm control signal is received from a lift arm control input commanding movement of the lift arm. The lift arm actuator is controlled responsive to receipt of both of the activation signal and the lift arm control signal to move the lift arm to a target lift arm position and to move the implement carrier to or maintain the implement carrier at a target implement carrier orientation relative to a gravitational direction.

The present disclosure is directed to a work vehicle such as a loader having a bucket attached to the lift arms of a lift assembly and including a system and method for controlling the operation of the lift assembly so as to enable the loader to move over varying terrain without spilling the contents of the bucket. The system includes a chassis sensor, a bucket sensor, a gravity sensor, and a control system for varying the position of the bucket. The system adjusts the bucket's orientation via the control system to maintain a 90 degree difference between the bucket vector and the gravity vector.

Disclosed is a self-level mechanism for controlling a tilting movement of an equipment (15) mounted to an equipment connector (5) of a main arm (3) of a lifting arrangement of a construction machine, preferably a wheel loader (1), upon pivoting said main arm (3). The self-level mechanism is configured to at least partially compensate any tilting movement of the equipment (15).

A method (30) of actuating a variable boom loading arrangement (1) that includes a variable length boom (2) that can be extended and retracted using a length actuator (3). A first end of the variable length boom (2) is pivotally attached to a frame, and the variable length boom (2) can be pivoted relative to the frame by means of a pivot actuator (5). A second end of the variable length boom (2) is used for handling loads. An input command that is given by an operator is modified if the variable boom loading arrangement (1) reaches a predefined tipping moment, resulting in a modified output command to the actuators (3, 5), so as to avoid a tipping of the variable boom loading arrangement (1). The input command is used to calculate an unmodified commanded direction of the second end of the variable length boom (2) in an external reference frame, in particular in an external Cartesian coordinate reference frame, wherein the modification scheme that is applied to the input command and that results in a modified output command to the actuators depends on the calculated unmodified commanded direction in the external reference frame.

Disclosed is a cantilever, including: a spar connected rotatably about a rear fixed axis to a fastening device for a vehicle; a tool lever connected rotatably about a front fixed axis to the spar; a deflecting triangle connected rotatably about a central fixed axis to the spar; a rear strut connected rotatably about a first strut pivot axis to the fastening device and rotatably about a second strut pivot axis to the deflecting triangle; a front strut connected rotatably about a third strut pivot axis to the deflecting triangle and rotatably about a fourth strut pivot axis to the tool lever. The rear and the central fixed axis span a first plane, the rear strut intersects the first plane, the central and the front fixed axis span a second plane, and the front strut intersects the second plane.

Disclosed power machines include a lift arm structure having a first arm pivotally mounted to a frame and a second arm, coupled to an implement interface, configured to telescopically extend from and retract into the first arm. A control system controls a first actuator to raise and lower the first arm, and controls a second actuator to extend and retract the second arm relative to the first arm. The control system is configured to control the first and second actuators to implement a lift operation, responsive to an operator input. During the lift operation, the first actuator raises the first arm and the second actuator extends and retracts the second arm to maintain a substantially linear path, such as a vertical path, of the implement interface or an implement attached to the implement interface.

A loader work apparatus includes: a bucket connecting arm connected to a bucket for scooping or holding cargo; a bucket cylinder having a variable length to allow the bucket to rotate about a connection part of the bucket connecting arm; a boom cylinder providing force for raising and lowering the bucket connecting arm; a boom connected to the bucket connecting arm and the boom cylinder; a boom support part to which the boom and the boom cylinder are coupled; and a boom connecting plate to which the bucket connecting arm, the boom cylinder, and the boom are coupled.