WORKING EQUIPMENT WITH CAPABILITIES OF PREVENTING BUCKLING OF HYDRAULIC CYLINDER

A working equipment (2) comprising a base (4) arranged to be mounted to a vehicle (6); a movable arm (8) connected to the base (4); a hydraulic system (10) comprising an elongate hydraulic cylinder (12) having a longitudinal axis A and provided with a cylinder cavity (14), and a piston (16) arranged to move forth and back within the cylinder cavity (14) along said longitudinal axis, and a piston rod (18) attached to the piston (16), the piston (16) dividing the cylinder cavity (14) in a first chamber (20) and a second chamber (22), the second chamber (22) being on the rod side of the piston (16), and a load holding valve unit (26) arranged on the hydraulic line (24) for the supply and return of hydraulic fluid to and from the second chamber (22) of the hydraulic cylinder (12). [0002] A pressure measurement member (28) is arranged to measure the pressure of the hydraulic fluid in the second chamber (22) of the hydraulic cylinder (12) during an outward movement procedure of the piston rod (18). A working equipment control system (30) is arranged configured to receive measured pressure values (34) obtained in the second chamber (22) during an outward movement procedure, and to evaluate said measured pressure values by applying at least one evaluation criterion related to risk of hydraulic cylinder buckling of said hydraulic cylinder (12). The working equipment control system (30) is further configured to perform at least one predetermined activity to reduce the risk of hydraulic cylinder buckling in dependence of the result of said evaluation.