Abstract: A method monitors the state of a device having a first drive cylinder for receiving hydraulic fluid and a first drive piston which is movably arranged in the first drive cylinder. The method determines a speed of the first drive piston, establishes a difference between the determined speed of the first drive piston and an expected speed of the first drive piston, and determines a faulty state as a function of the difference established between the determined speed of the first drive piston and the expected speed of the first drive piston.

Abstract: A large manipulator for concrete pumps a distributor boom that includes an articulated boom mounted on the boom pedestal and formed by multiple articulating boom arms with multiple joints for pivoting the boom arms with respect to the boom pedestal or an adjacent boom arm. A control device controls the movement of the articulated boom with the aid of drive unit actuating elements associated with the articulated joints. A device determines the vertical speed v? and/or horizontal speed v? of a location on at least one boom arm in a coordinate system referenced to the frame. A device is also provided for determining the articulating angles of the joints.

Abstract: A method operates a construction material and/or viscous-material pump having: at least one conveying cylinder, the conveying cylinder being designed to receive and discharge construction material and/or viscous material; and at least one conveying piston, the conveying piston being disposed in the conveying cylinder for movement in order to draw construction material and/or viscous material into the conveying cylinder and to displace drawn-in construction material and/or viscous material out of the conveying cylinder.

Abstract: A method monitors the state of a device having a first drive cylinder for receiving hydraulic fluid and a first drive piston which is movably arranged in the first drive cylinder. The method determines a speed of the first drive piston, establishes a difference between the determined speed of the first drive piston and an expected speed of the first drive piston, and determines a faulty state as a function of the difference established between the determined speed of the first drive piston and the expected speed of the first drive piston.

Abstract: A large manipulator for concrete pumps a distributor boom that includes an articulated boom mounted on the boom pedestal and formed by multiple articulating boom arms with multiple joints for pivoting the boom arms with respect to the boom pedestal or an adjacent boom arm. A control device controls the movement of the articulated boom with the aid of drive unit actuating elements associated with the articulated joints. A device determines the vertical speed v? and/or horizontal speed v? of a location on at least one boom arm in a coordinate system referenced to the frame. A device is also provided for determining the articulating angles of the joints.