A work machine extending in a fore-aft direction comprising a frame and a ground-engaging mechanism, the ground-engaging mechanism configured to support the frame on a ground surface; a boom assembly coupled to the frame, the boom assembly having a pair of boom arms pivotally coupled to the frame; and an attachment coupled to a fore-section of the boom arms. The attachment may comprise a guide rigidly coupled to a fore-section of the frame; a movable member coupled to the guide, the movable member moveable relative to the frame by a pair of hydraulic cylinders, the guide restricting movement of the movable member in a non-vertical direction; and a work tool coupled to the movable member wherein actuating the pair of hydraulic cylinders engages the movable member, vertically lifting or lowering the work tool relative to the frame.

A work machine comprising a frame and a ground-engaging mechanism, the ground-engaging mechanism configured to support the frame on a surface, a boom assembly coupled to the frame, the boom assembly having a pair of boom arms pivotally coupled to the frame and moveable relative to the frame by a pair of boom hydraulic cylinders, an attachment coupler coupled to a distal section of the boom arms, and an attachment. The attachment comprises a work tool. The work tool is coupled to the C-frame. A pair of first C-frame sections are pivotally coupled to the frame of the work machine, and a second C-frame section is pivotally coupled to the attachment coupler, wherein actuating the pair of boom hydraulic cylinders engages the boom arms, pitching the attachment upwards or downwards.

A mobile work machine includes a first grade control system that receives a an external reference position signal from a geographic positioning system, and generates blade control signals to control an orientation of a blade in grading a worksite. The mobile work machine also includes a second grade control system that uses blade mainfall and cross slope as well as chassis (or mainframe) mainfall and cross slope to control the orientation of the blade relative to the frame of the work machine to create a planar grade of a desired mainfall and cross slope. When functionality of the first grade control system is interrupted, the mobile work machine automatically switches to using the second grade control system to perform the grading operation, until the interruption to the functionality of the first grade control system is restored.

A mobile work machine includes a first grade control system that receives a an external reference position signal from a geographic positioning system, and generates blade control signals to control an orientation of a blade in grading a worksite. The mobile work machine also includes a second grade control system that uses blade mainfall and cross slope as well as chassis (or mainframe) mainfall and cross slope to control the orientation of the blade relative to the frame of the work machine to create a planar grade of a desired mainfall and cross slope. When functionality of the first grade control system is interrupted, the mobile work machine automatically switches to using the second grade control system to perform the grading operation, until the interruption to the functionality of the first grade control system is restored.

This construction machine includes a blade and a manipulating lever. The blade is provided to a machine body. The blade is configured such that a plurality of operations are possible. The manipulating lever manipulates the blade. The manipulating lever is configured so as to be able to control each of the plurality of operations by a different manipulation. The manipulating lever is preferably configured so as to be able to manipulate each of the plurality of operations in the same direction.

A vehicular accessory system includes a first accessory pivotable in a first direction via pressurized fluid at a first actuator and pivotable in a second direction via pressurized fluid at a second actuator, and a second accessory pivotable in a third direction via pressurized fluid at a third actuator and pivotable in a fourth direction via pressurized fluid at a fourth actuator. A valve assembly is in fluid communication with the first, second, third and fourth actuators. Responsive to pivoting of the first accessory to a first fully pivoted orientation, the valve assembly automatically operates to supply pressurized fluid to the third actuator to pivot the second accessory in the third direction. Responsive to pivoting of the first accessory to a second fully pivoted orientation, the valve assembly automatically operates to supply pressurized fluid to the fourth actuator to pivot the second accessory in the fourth direction.

An earth levelling blade assembly for mounting on the lift arms of a loader includes a laterally extending main blade and two shoes supported at opposing ends of the main blade for sliding engagement along the ground. The shoes are supported for movement between a forward position ahead of the main blade and a rearward position behind the main blade, as well as being adjustable in height relative to a bottom cutting edge of the main blade. A coupling arrangement between a first mounting frame on the lift arms of the loader and a second mounting frame on the rear mounting face of the main blade (i) supports the second mounting frame to be freely pivotal about a forward axis relative to the first mounting frame in which the forward axis is oriented in the forward working direction of the loader and (ii) supports the second mounting frame to freely translate relative to the first mounting frame along an upright axis.

A ground engaging tool control system including a first sensor system, a second sensor system, a first actuator system, a second actuator system, and an electronic data processor. The first and second sensor systems detect respective positions of a first ground engaging tool and a second ground engaging tool. The first actuator system is coupled to the first ground engaging tool and the second actuator system is coupled to the second ground engaging tool. The electronic data processor determines a target grade profile and generates two or more control signals to adjust target positions of the first ground engaging tool and the second ground engaging tool. The target position of the second ground engaging tool is determined based on at least one of a position of the first ground engaging tool or the comparison of a current grade profile and a desired grade profile.

A movable blade assembly which can be attached to the front or rear of a vehicle and the height of the blade can be adjusted with respect to a roadway such that the blade only comes into contact with relatively large debris and moves them from the roadway.

A hydraulic pump is driven by an engine. A hydraulic motor is driven by hydraulic fluid discharged from the hydraulic pump thereby causing a vehicle to travel. A controller controls a rotation speed of the engine and a displacement of the hydraulic pump. The controller acquires a tractive force of the vehicle. The controller changes the rotation speed of the engine to a low speed side in accordance with a reduction in the tractive force.