Abstract: A drive for a hydraulic excavator having an electric motor as a main drive. In order to provide a compact, low-maintenance and reliable drive system, at least one diesel engine is arranged on the excavator vehicle itself and can be switched on as required and supplies the chassis with power independently of the main drive.

Abstract: A method and an apparatus for driving a hydraulic system of a construction machine, in particular a hydraulic excavator, having a plurality of control blocks which are fed via at least one pump each and each drive a plurality of hydraulically operated actuators of the construction machine. At least two control blocks are designed to drive the same actuator. The delivery capacity of the pump of the second control block can be connected up to the actuator via a delay element.

Abstract: The hydraulic control is constructed for time-sharing of the pump which normally controls the turning mechanism, to operate other hydraulic equipment in conjunction with other pumps.

Abstract: The present invention is directed towards a method for measuring the weight of bulk goods loaded or, alternatively, loading performance over time of hydraulic earth moving machines, excavators or similar machines which are provided with a hydraulically operated material loading scoop. Typically, these loading scoops rotate about and are supported on a loading arm. The scoop is controlled and tilted by a hydraulic piston-cylinder unit. The determination of the weight of bulk goods loaded or of the loading performance of the excavator is often required by the operator and the manufacturer of the apparatus, both for the determination of the performance of the apparatus per work shift, or for the computation of the fully loaded weight of a transport vehicle used in carrying away the bulk goods.