Public works vehicle for ground leveling, has hydraulic jack freely moved when manipulator is in floating control position, when vehicle is in loading mode, and pressure reducing valve inactivating position, when vehicle is in lifting mode

摘要

The vehicle (1) has a hydraulic jack (7) moving arms (6) of a work equipment (5) with respect to a frame (2). A hydraulic circuit supplies the jack based on control orders issued from a hydraulic manipulator. The jack is freely moved when the manipulator is in a floating control position and the vehicle is in a loading mode. A pressure reducing valve inactivates the floating control position, when the vehicle is in a lifting mode.