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This paper describes the new 3000 Series MK II engines and their application in the Allis-Chalmers 7030 and 7050 farm tractors. This includes performance, reliability, noise reduction, and economy of operation to meet the environmental and performance specifications established for these farm tractors. Improvements were made to the cylinder block, cylinder sleeve, piston and ring, crankshaft and flywheel, water and oil pumps, cylinder head, exhaust manifold, lube oil cooler and filters, and intercooler and turbocharger (depending on the engine model). Endurance tests at full speed over fueling, load cycle testing, and field testing were conducted.

Allis-Chalmers has introduced a new family of tractors for 1973 in the 130-155 hp (96-116 kW) class. The unique design and development aspects are presented for the entire power train system - Power Director transmission, range transmission, park lock, differential and differential lock, brakes, final drive, and independent PTO. Durability, performance, low noise emission, safety, and convenience of operation were the key objectives.

Durability of planetary final drive gearsets for use in large agricultural tractors can be enhanced by modifying gear tooth profiles, adding sufficient rigidity to the system, and floating at least one of the members. Properly applied to the design, these procedures may also reduce the need for close manufacturing tolerances Their application was instrumental in providing a successful planetary final drive design for the Allis-Chalmers Models 7030 and 7050 agricultural tractors.

Allis-Chalmers has introduced a new Power Shift transmission to be utilized in its New Family of agricultural tractors in the 136-161 hp (101-120 kw) class. This optional transmission, utilizing both countershaft and planetary gearing, heavy duty, wet disc clutches and a uniquely designed control system provides twelve forward and two reverse vehicle speeds when coupled with the standard range transmission. Qualities of durability, safety and low noise emission of the Models 7040 and 7060 tractors are further enhanced by smooth power shifting, providing additional operator convenience and performance.

A unique laboratory system for evaluation of agricultural tractor engines and power trains has been developed which closely simulates field loading, operates on a continuous 24 h basis, and is fully automated to reduce manpower expense. The programming hardware in conjunction with a dynamometer system provides a continuous and efficient method of indoor evaluation which correlates well with results from field test units. A master load histogram produced from collected field data was used to derive an engine loading cycle. A data logging system monitors the test stands during unattended times. Certain shortcomings-lack of reaction to environmental conditions, geographical differences, an operator's “feel” of a vehicle-will not totally eliminate field testing.

A multiple wet disc braking system has been developed for the Allis-Chalmers Models 7030 and 7050 agricultural tractors. An extensive test program was developed, numerous friction materials were tested, and laboratory testing supplemented tractor testing so that all factors could be evaluated. The multiple disc brake shows promise for greater tolerance in the selection of friction materials to solve such braking problems as noise, fade, energy capacity, and torque capacity.