HEFINRICHTING EN HYDRAULISCH SYSTEEM DAARVOOR, ALSMEDE WERKWIJZE VOOR HET AANPASSEN DAARVAN.

摘要

Lifting device (3) comprising a frame (2) as well as a movable lifting arm (4) provided with a connecting device at a free end thereof for connecting a hydraulically operable tool (5) to the lifting arm (4). The lifting device (3) is provided with a hydraulic system for controlling a hydraulic actuator (50) of the tool. The hydraulic system comprises a reservoir (32) for hydraulic fluid disposed on the frame as well as a pump unit (31) connected to the reservoir for pumping hydraulic fluid through the hydraulic system; a control valve unit (33), which is connected to the pump unit; a first line (41) and a second line (42), which extend from the control valve unit (33) to the connecting device (8). The control valve unit (33) is designed for operatively connecting the first line (41) and the second line (42) at least alternately to the pump unit (31) for alternately pressurizing the first line (41) and the second line (42). The hydraulic system comprises a connecting line provided with a controllable connecting valve unit (33), which connecting line is connected to the first line (41) and the second line (42) in such a manner that the first line (41) and the second line (42) can be operatively connected to the pump unit (31) simultaneously for pressurizing the first line (41) and the second line (42) simultaneously.