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An eight speed, hydraulically controlled, stepped transmission was found to be the closest practical approach to the ideal for agricultural and industrial tractors. This paper describes the means used to obtain maximum reliability and operator acceptance. Proper spacing of speed ratios, automatic programing of modulated shift pressures, and close attention to minimizing torque loss during shifts were found to be of prime importance.

Increasing acceptance of tractor cab air conditioning is evidenced by the rapid population growth of air-conditioned agricultural vehicles. Both field- and factory-installed units made available by numerous manufacturers provide wide variations of system capabilities to meet various customer requirements. The present air conditioning state-of-the-art utilizing the vapor compression system supports manufacture of functional units of adequate capacity to meet most agricultural cab requirements. However, the severe applications to which most off-the-road (including agricultural) vehicles are subjected in comparison with automobiles require some unique design innovations. Further development of system components to provide increased system reliability and durability will result in increasing customer acceptance and satisfaction.

The evolution of a formal reliability program, the organization and function of all departments in the reliability division, and some associated accomplishments to date are presented. The total program is discussed, including reliability goal setting, analysis of new and current design, inspection planning, reconciliation of engineering specifications and manufacturing processes, vendor rating, and audit and inspection procedures. Emphasis is placed on proved successful procedures.