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SAE J987, Crane Structures - Method of Test, has made several contributions to stress analysis by distinguishing between different kinds of stress areas, standardizing the conditions of test, prescribing acceptable stress levels for duty cycles expected, and standardizing the recording of data. This paper discusses the testing of a 65 ton truck crane frame in accordance with the test procedure, including placement and number of gages, endurance life, and analysis of data.

Hydraulic crane boom design factors, such as loading, weight, extension method, and configuration are discussed with special emphasis on the practical aspects of their effect on mobility, lifting capacity, and boom length. A brief history of hydraulic cranes and telescopic booms as well as future potential is discussed.