Preliminary adjustment of the tractor is permitted at this time. The tractor is limbered up for 12 hours on the drawbar, using each gear with light to heavy loads during the limber-up period. The operator's manual is also used as the guide for selecting the proper fuel and for routine lubrication and maintenance operations". Preparation for Test The engine crankcase is drained and refilled with new oil conforming to specifications in the operator's manual. The static tire loads and the tire inflation pressures must conform to the Tire Standards published by the ASAE and SAE.
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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