A hydrovac is provided having, an engine, a transmission comprising a power take-off connected to a hydraulic pump, a debris tank, a vacuum hose connected to the debris tank, a boom carrying the vacuum hose, a blower operative to create a vacuum in the debris tank, a hydraulic motor connected to the blower to drive the blower, the hydraulic motor connected to the at least one hydraulic pump, an emergency shutoff valve connected in fluid communication with the debris tank, a boom isolation assembly which in a closed position fluidly isolates the debris tank from the vacuum hose, and a controller. A controller operative to, in response to the controller losing communication with a remote control, open the emergency shutoff valve, close the boom isolation assembly, disengage the power take-off, and after the power take-off is disengaged, slowing a speed of the engine to an idle speed.

A hydrovac is provided having an engine mounted on the frame, a transmission connected to the engine with a power take-off, a hydraulic fluid pump connected to the power take-off, steering wheels operative to steer the hydrovac, ground wheels operative to be driven by the engine through the transmission, a debris tank, a vacuum hose fluidly connected to the debris tank, a boom pivotally carrying the vacuum hose, a blower operatively connected to the debris tank to create a vacuum in the debris tank, and a hydraulic motor connected to the blower, the hydraulic motor connected to the hydraulic pump. A controller can be provided, operative to vary a speed of the engine between a first RPM and a second RPM, whereby operating the engine at the first RPM drives the hydraulic pump faster than operating the engine at the second RPM.

A hydrovac and a method of conducting an emergency is provided. The hydrovac has an engine, a transmission, steering wheels, ground wheels, a debris tank, a vacuum hose connected to the debris tank, a boom carrying the vacuum hose, a blower operative to create a vacuum in the debris tank, a hydraulic fluid pump, an emergency shutoff valve connected in fluid communication with the debris tank, at least a solenoid valve connected between the hydraulic fluid pump and the emergency shutoff valve, a relay connected between a voltage source and the hydraulic solenoid valve, and an emergency stop buttons operative to interrupt voltage when the emergency stop buttons is pressed. Pressing the at least one emergency stop button interrupts voltage to the at least one hydraulic solenoid valve, stopping supply of hydraulic fluid to the emergency shutoff valve, opening the emergency shutoff valve and venting the debris tank.

The disclosure relates to a mobile working machine comprising a driver's cab for accommodating an operator of the mobile working machine, a control station for the operator arranged in the driver's cab, a primary steering system arranged in front of the control station in the direction of travel of the mobile working machine, and a secondary steering system, arranged laterally offset from the control station in the direction of travel of the mobile working machine, wherein the primary steering system has a steering column section, which cooperates with a steering column mount to transmit a steering actuation to a control unit implementing the desired steering movement, wherein the steering column section and the steering column mount can be connected to each other in a rotationally fixed manner via a plug-in connection, such that the operator is able to dismount the primary steering system depending on a perceived visual restriction.

A boom assembly for an excavation vehicle includes a bracket configured to couple to a turret that is rotatably mounted to a debris body. Three or more telescoping support members. A first support member of the three or more telescoping support members is pivotably coupled to the bracket, a second support member of the three or more telescoping support members supports a shoe at a distal end, and a third support member of the three or more telescoping support members is disposed at least partially between the first support member and the second support member. The boom assembly also includes a single actuator. One end of the actuator is coupled to the first support member and the other end of the actuator is coupled to the second support member. The actuator is configured to extend and retract the second support member relative to the first support member.

A material-receiving device for a suction excavator has an articulated tube support and a suction tube. A first, proximal end of the articulated tube support is attachable to the suction excavator by a rotationally movable fastening mount. At a second distal end, the articulated tube support comprises a suction connecting piece connected to the suction tube. The articulated tube support comprises n3 links, between each of which a hinge joint with an associated drive is formed. All the hinge joints have the same degree of freedom, so that the links are pivotable in a common plane. A rotary joint is located between the last, distal hinge joint, on which the suction connecting piece is located, and the first hinge joint. The rotary joint has a different degree of freedom than the hinge joints, so that the link disposed subsequently to the rotary joint can be moved out of the plane.

A boom assembly for an excavation vehicle includes a bracket configured to couple to a turret that is rotatably mounted to a debris body. Three or more telescoping support members. A first support member of the three or more telescoping support members is pivotably coupled to the bracket, a second support member of the three or more telescoping support members supports a shoe at a distal end, and a third support member of the three or more telescoping support members is disposed at least partially between the first support member and the second support member. The boom assembly also includes a single actuator. One end of the actuator is coupled to the first support member and the other end of the actuator is coupled to the second support member. The actuator is configured to extend and retract the second support member relative to the first support member.

A vacuum vehicle where some or all of the boom used to manipulate the position of the vacuum hose is electrically non-conductive. If the boom happens to contact an electrical line or other carrier of electrical energy, electrical energy will not be transmitted from the electrical line into the boom due to the electrically non-conductive nature of the boom, thereby protecting the vacuum vehicle, its equipment, and any worker on or near the vacuum vehicle.

A method for controlling an articulated arm with a mobile remote control unit located spatially distant therefrom employs a machine coordinate system which is linked to the articulated arm, and an input coordinate system which is linked to the remote control unit. A deviation between the spatial orientation of the input coordinate system relative to the spatial orientation of the machine coordinate system is determined. A target movement direction and target movement speed of the end piece of the articulated arm in the input coordinate system are detected via control elements of the remote-control unit. The target movement direction is transformed into a transformed movement direction using the determined deviation. The transformed movement direction and the movement speed are transmitted to an articulated arm control unit for controlling a drive unit of the articulated arm.