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The technical evolution of the new Minneapolis-Moline G1000 tractor from the market analysis, preliminary design stages through the final design and testing stages is presented. The modification of an existing engine is described, with respect to the various engine parts. Technical features of the tractor, such as side rails, clutch, transmission, front end, PTO, and hydraulics are also discussed. Finally, the testing and evaluation of the unit are described.

The development of the new Minneapolis-Moline U302 farm tractor is described, starting with the marketing and design objectives. The new features are outlined and compared with the tractor model which the U302 replaced. The prototype build-up procedure, component and subassembly, drive train, and complete tractor tests are discussed. Several problems encountered during the tests and corrections made are analyzed in some detail. Procedures for minimizing development time, that is, acceleration of durability evaluation, were utilized whenever possible.

RESULTS of an investigation into the effect of shot-peening variables and the resulting residual stresses on fatigue life are reported in this paper. Leaf springs were the simple specimens heat-treated, cold worked, and tested in this study. Some of the conclusions reached are: 1. There is a minimum shot velocity for each shot size to obtain best fatigue life, and this value is much lower than that normally used. 2. Exposure time for this type of shot-peened specimen beyond some minimum value is wasteful and costly. 3. Shot size has little influence on fatigue life for these specimens. 4. Shot peening specimens while under tensile strain greatly increases fatigue life at 200,000 psi nominal stress over that of nonpeened or strain-free-peened specimens. 5. Shot peening these specimens gave residual compressive stresses 50% of yield strength, and these stresses can be increased to more than 50% by strain peening. 6.