Patent ID: 6968685

Claim:
A hydraulic drive, comprising: a position selection device in communication with a control valve which, as a function of the actuation of the position selection device, controls the connection of an actuating cylinder with a hydraulic fluid source and a reservoir; and a correction device providing synchronization between the position of the position selection device and the position of the actuating cylinder, wherein the correction device includes: a sliding valve means which detects a reference range of the actuating cylinder and, when the actuating cylinder is not in the reference range, provides an equalization of hydraulic fluid in the actuating cylinder; and an on-off valve means which is connected with the position selection device, which has a closed position that shuts off the hydraulic fluid equalization and an open position that makes possible the hydraulic fluid equalization, wherein the on-off valve means is actuated into the open position when the position selection device is in the reference range and is actuated into the closed position when the position selection device is not in the reference range, and wherein the on-off valve means is a rotary sliding valve connected with the position selection device.