An auto-leveling drive axle device for a wheel tractor, and leveling method. The device comprises a transmission device and a leveling device. The device of the present invention changes only a vertical position of a drive axle with respect to a wheel, and a wheel shaft distance and wheel center spacing are not changed, thus improving traveling stability of a vehicle.

A construction vehicle has a slewing ring on which a superstructure is rotatably mounted, and an undercarriage supporting the slewing ring. The undercarriage includes an upper chassis, having an upper propulsion device, that is rigidly connected to the slewing ring, and a lower chassis having a lower propulsion device that is mounted in a pivotable manner with respect to the upper chassis. Furthermore, a pivoting apparatus is provided in order to pivot the lower chassis relative to the upper chassis.

A method for forming hydraulic oil passages for hydraulic actuators according to an aspect of the present invention includes: forming a valve block mount surface including first and second regions on an outer surface of a housing; collecting valves for hydraulic actuators belonging to a main function group to a main function valve block that is mountable directly or indirectly on the first region; collecting valves for hydraulic actuators belonging to an additional function group to an additional function valve block that is mountable directly or indirectly on the second region; and mounting the valve blocks on corresponding regions of the valve block mount surface, and thereby, the hydraulic actuators to be mounted are fluidly connected to each other so that the hydraulic actuators are operable by using hydraulic oil from a common oil source.

A hydraulic system is provided for a mobile machine having a lift arm attached to a bucket and a transmission. The hydraulic system may have a hydraulic actuator configured to move the lift arm and bucket. The hydraulic system may further have an accumulator configured to store pressurized fluid and an accumulator valve configured to control fluid flow between the accumulator and the hydraulic actuator, for a ride control mode of operation configured to cushion movement of the bucket. The hydraulic system may also have a lift arm sensor associated with the mobile machine and configured to generate an angle signal indicative of an angle of the lift arm and a speed sensor associated with the mobile machine and configured to generate a speed signal indicative of the speed of the mobile machine. The hydraulic system may further have a controller in communication with the accumulator valve, the lift arm sensor, the speed sensor, and the transmission. The controller may be configured to receive the speed signal, determine a gear setting of the transmission, and receive the angle signal. The controller may also be configured to selectively activate and deactivate the ride control mode of operation based on the speed of the mobile machine and the angle of the lift arm when the gear setting of the transmission is below a minimum gear setpoint.

Mobile apparatus comprising a main frame with displacing means; a sub-frame connected rotatably to the main frame; an operating arm connected to the sub-frame and comprising at least a first and a second articulation which are connected pivotally to each other, which operating arm can be transformed from an operating position to a transport position; drive members configured to move at least the first and second articulations of the operating arm; operating instruments controllable by a driver and provided close to a driver position on the sub-frame; measuring instruments configured to measure position data relating to a position of the first articulation and a position of the second articulation; and a control system configured to receive operational data from the operating means and position data from the measuring instruments; and configured to control the drive members in accordance with the received position data and the operational data.

An oil channel that connects, a right damper and a left damper includes a switching valve arranged between a right oil channel ER and a left oil channel EL. The switching valve includes a valve main body in which a first switching channel is formed for connecting the right oil channel ER and the left oil channel EL. The valve main body is rotatable to a first position where the first switching channel connects the right oil channel ER and the left oil channel EL to each other and to a second position different from the first position. According to this damping system, it is possible to adjust oil flow in the oil channel by performing a simple operation for the switching valve.

Systems to control movement of a motor grader include a sensor for providing a bounce signal indicative of a bouncing movement of the motor grader, and a controller programmed with instructions that, when executed: receive the bounce signal from the sensor; analyze the bounce signal from the sensor; determine whether the maximum amplitude of the bouncing movement exceeds a threshold; in response to determining whether the maximum amplitude exceeds the threshold, generate an articulation angle command signal to change an articulation angle of the motor grader; and transmit the articulation angle command signal to change the articulation angle.

A hydraulic system is provided for a mobile machine having a lift arm attached to a bucket and a transmission. The hydraulic system may have a hydraulic actuator configured to move the lift arm and bucket. The hydraulic system may further have an accumulator configured to store pressurized fluid and an accumulator valve configured to control fluid flow between the accumulator and the hydraulic actuator, for a ride control mode of operation configured to cushion movement of the bucket. The hydraulic system may also have a lift arm sensor associated with the mobile machine and configured to generate an angle signal indicative of an angle of the lift arm and a speed sensor associated with the mobile machine and configured to generate a speed signal indicative of the speed of the mobile machine. The hydraulic system may further have a controller in communication with the accumulator valve, the lift arm sensor, the speed sensor, and the transmission. The controller may be configured to receive the speed signal, determine a gear setting of the transmission, and receive the angle signal. The controller may also be configured to selectively activate and deactivate the ride control mode of operation based on the speed of the mobile machine and the angle of the lift arm when the gear setting of the transmission is below a minimum gear setpoint.

A method of adjusting a first plane of a work machine comprising first, second, third and fourth adjustable stabilisers that are each extendable between a minimum extension and a maximum extension. A difference in length between the minimum extension and the maximum extension is the same for each adjustable stabiliser. The first, second, third and fourth adjustable stabilisers are configured to support the work machine when a distal end of each adjustable stabiliser is in contact with a ground surface. A first stabiliser pair comprises the first adjustable stabiliser and the second adjustable stabiliser. A second stabiliser pair comprises the second adjustable stabiliser and the third adjustable stabiliser. The method comprises: a. extending the first, second, third and fourth adjustable stabilisers to a first configuration, wherein in the first configuration each adjustable stabiliser is at a calibration extension and the first plane is parallel to a reference plane defined by points of contact of the distal ends of the first, second, third and fourth adjustable stabilisers with the ground surface; b. adjusting the first stabiliser pair such that the first, second, third and fourth adjustable stabilisers arrive at a second configuration, wherein in the second configuration: either the tilt sensor indicates that the first plane is parallel to a first axis of a target plane; or the first adjustable stabiliser and the second adjustable stabiliser have reached the maximum extension; c. adjusting the second stabiliser pair such that the first, second, third and fourth adjustable stabilisers arrive at a third configuration, wherein in the third configuration: either the tilt sensor indicates that the first plane is parallel to a second axis of the target plane; or the second adjustable stabiliser and the third adjustable stabiliser have reached maximum extension.