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摘要

A braking system for a part that can be moved by a drive, in particular the rotary drive of the revolving superstructure of a building machine, has at least one regulating pump that supplies at least one hydraulic motor with hydraulic medium in a closed circuit. When the drive is braked, the swivelling lever of the regulating pump may be swivelled back to and blocked in the zero position of the regulating pump by components that engage the swivelling lever.