Disclosed embodiments include hydraulic systems which provide power to lift, tilt and auxiliary (e.g., implement) functions, including high-flow auxiliary functions, with increased efficiency. Disclosed embodiments incorporate a single variable displacement pump that supplies pressurized fluid to a main control valve (e.g., for lift, tilt, and auxiliary functions) and a bypass circuit. The main control valve supplies fluid to control lift, tilt, and auxiliary flow for implements. The bypass circuit combines flow with the output of the auxiliary section of the main control valve to optionally provide high-flow for selected implements. The single variable displacement pump can then be set to different output flow levels, with the bypass circuit functioning differently under different conditions to optimize hydraulic flow to carryout various tasks under various conditions.

A shovel includes a lower traveling body, an upper turning body turnably attached to the lower traveling body, an automatic greasing device mounted on the upper turning body, and a control device configured to control the automatic greasing device. The control device is configured to control timing to start greasing by the automatic greasing device based on the past operating condition of the shovel.

A system for controlling an engagement operation between first and second movable machines includes a separation sensor, a relative speed sensor and a controller. The separation sensor determines a separation distance between the first and second machines. The relative speed sensor determines a relative difference in speed between the first and second machines. The controller determines the separation distance between the first and second machines, decelerates the first movable machine when the separation distance is within a deceleration zone, determines a relative difference in speed between the first and second machines, and generates an engagement speed command to operate the first movable machine at a first ground speed equal to a second ground speed of the second movable machine plus a relative engagement speed when the separation distance is within a buffer zone.

Described is an earth scraper including multiple buckets to receive earth scraped by a scraper blade. A lifter mechanism is provided to move one of the buckets between elevated and lowered positions.

A work machine includes work equipment. A control device of the work machine includes a trajectory generation unit, and an operation signal output unit. The trajectory generation unit generates a target trajectory of the work equipment according to an excavation curve ratio determined in advance. The excavation curve ratio is expressed as a ratio of an excavation depth to an excavation length. The operation signal output unit outputs an operation signal for the work equipment according to the target trajectory.

A shovel control device includes processing circuitry that is configured to receive an input of a shape of a bucket provided at a tip of an attachment attached to a shovel, and calculate a weight of an object in the bucket, based on the input shape of the bucket and an output of a sensor whose detection result changes according to the weight of the object in the bucket.

A control method to operate a scraper over ground, the control method comprising: receiving a signal indicative of a desired attack angle between a cutting edge of the scraper and the ground; receiving a height control signal to control a cutting edge height; receiving one or more measuring signals from one or more sensors, calculating a measured attack angle based on the one or more measuring signals; comparing the measured attack angle and the desired attack angle; and outputting at least one control signal commanding movement of a bowl of the scraper based on the height control signal and a result of the comparing the measured attack angle and the desired attack angle.

An excavator according to an embodiment of the present invention includes a lower traveling body, an upper turning body with an attachment mounted on the lower traveling body, and a controller installed in the upper turning body. The controller is configured to restrict movement of the lower traveling body based on information about terrain around the upper traveling body.

In accordance with an example embodiment, a method of operating a work vehicle with an ejector body may include receiving a position signal indicative of a position of the work vehicle, receiving a target profile indicative of a target topography for an area, receiving an ejection command at a controller and entering the controller into an ejection mode based on the ejection command, and controlling, with the controller, in the ejection mode, at least one of a speed of the work vehicle and a speed of an ejector included in the ejector body based on the position signal and the target profile, to spread a load of material from the ejector body onto a ground surface.

A hydraulic system for a service vehicle wherein a hydraulic pump is powered by the vehicle engine to energize a hydraulic circuit that can power multiple interchangeable implements and hand tools. The multiple interchangeable implements include a lift assembly mounted to the flatbed of the truck. The lift assembly includes a mini skid steer which is hydraulically lifted on and off the platform of the flatbed. Additionally, the interchangeable implements include a crane arm that is disposed on the flatbed of the truck. Furthermore, the interchangeable implements also include a hydraulic arm assembly with several hydraulic attachments. These attachments may include a bucket, a drill, a breaker and the like.