This SAE Standard may be used for all revolving cranes wherein the capacity of the crane to support loads is based on its resistance to overturning. It is not applicable to cranes wherein the capacity of the crane is based on factors other than stability. Purpose The purpose of this test is to determine the maximum capacity of a crane to counterbalance loads applied on its hook. The capacity of the crane is reported in terms of the load in kg (pounds) and its corresponding radius in m (feet) for a specified position of the upper structure with respect to the mounting.