Additional weight may be added to the tractor as ballast if the manufacturer recommends use of such ballast. An official representative of the company is present during the test to see that the tractor gives its optimum performance. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. The manufacturer selects the tractor to be tested and certifies that it is a stock model. EXPLANATION OF THE TEST PROCEDURE General Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure.
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