The resistance frame of the MAS 65 deep soil loosening machine, also called frame, represents an essential component for its optimum functioning. The machine's frame is subjected to composed mechanical strains during exploitation which could destroy its integrity. The verification of the frame's resistance could be made directly in the field, through the exploitation of several hundred hectares during a working season or in laboratory conditions. Within the paper it is presented the testing method in laboratory, through simulating the field strains, based on the real stress spectrum at which the structure is subjected. After applying a rain flow type cycle counting algorithm and synthetizing a test program based on it, the frame is tested in accelerated regime within laboratory, being mounted on a testing stand fitted with hydraulic actuator. The test purpose is to experimentally determine the frame's exploitation resistance in a reasonable amount of time and with minimum costs. The presented testing method could be generalized for most of agricultural equipment, representing a powerful tool in stages of designing and validation of a new product.