Abstract: In a loader bucket having a back member pivotable on a boom assembly which is pivotable on a tractor and a front member pivotable on the back member, power-operated means for effecting relative pivoting of the members have comprised two hydraulic piston-and-cylinder assemblies disposed at the respective ends of the bucket and fed from a common pressure line so as to work in unison. However, when gripping asymmetrical loads between the members the front member is distorted due to the pressure liquid taking the path of least resistance and thus permitting unequal extension of the piston-and-cylinder assemblies. This problem is minimized by employing a single, central hydraulic piston-and-cylinder assembly connected between a point on the back member and a lug fixed to a torsion bar which interconnects the ends of the front member along its pivot axis. The gripping of asymmetrical loads then twists the torsion bar within its elastic limit.