A hydraulic assist mechanism for use in conjunction with a gear shift device provides a hydraulic cylinder and piston combination connected by a linkage to a gear shift mechanism. The interface is of a same type as used by a radio access network of the macro wireless network to communicate with the service node. As the bucket rotates zthrough the dumping process components of the linkage system travel a path over and beyond the end of the raised lift arm assembly maintaining favorable mechanical advantage over the bucket throughout its rotation. An elastic member 14 is formed of an elastic material and provided with a cylindrically-shaped shaft accommodating opening 14a. A member formed by integrating the driven mass body and the detection mass body through the drive spring is supported relative to the support base plate by the detection springs in a cantilever manner. The method includes the steps of removing the mechanical connections of the actuators from the movable, leaving the movable free to rotate around its hinge line, further balancing the movable and calculating in a first approach its coarse static moment.