Tractor Trendsetter: Case 70 Series
Written By Larry Gay
Cabs for farm tractors began to become popular during the 1960s. However, these were built by aftermarket suppliers and sold as attachments. Although these early cabs provided the operator protection from the weather, they often increased the noise level for the operator, collected dust, and offered no protection in case of a tractor roll-over. In 1966, John Deere introduced its Roll-Gard, a 2-post roll-over protective structure (ROPS). Later, John Deere offered a Roll-Gard Cab which consisted of the Roll-Gard and a purchased cab which was large enough to fit around the Roll-Gard. For the 1970 model year, J. I. Case introduced four models of the 70 series of row-crop tractors with a new cab which incorporated a 4-post ROPS in the basic structure of the cab. This cab made the Case 70 series a tractor trendsetter.
The Case 770, 870, 970, and 1070 Agri King tractors were introduced to the Case dealers at the "Intro 70" meeting in August 1969. The new models replaced the 30 series tractors and were rated as 4-5 plow, 5-plow, 6-plow, and 7-plow tractors, respectively. At Nebraska, the four tractors developed 56, 71, 85, and 100 PTO horsepower. The 770 and 870 were powered by 4-cylinder Case engines and the 970 and 1070 were equipped with 6-cylinder Case engines. The 1070 was available with only a 451-cubic-inch diesel engine and the others offered a choice of gasoline or diesel engines. All the engines were new with a 5-inch stroke and bore sizes ranging from 4 to 4.62 inches. An 8-speed dual-range transmission was standard and a new partial powershift transmission with three powershift speeds in each of four ranges was optional.
Operator comfort and safety were featured on these new tractors with rubber mountings under the platform, a choice of three seats, a control console beside the seat, a tilt and telescoping steering wheel column, and the new cab with the ROPS built into the frame of the cab. The cab featured tight seals, two pressurizing fans, and optional heat and air conditioning. The 70 series tractors could be equipped with a 2-post ROPS instead of the cab and a seat belt was standard with either the cab or the ROPS. After the cab was designed by Case engineers, extensive testing was conducted by rolling the tractor over to insure the glass exploded outward and there was an adequate space for the operator if the cab partially crushed.
Larry Gay is the author of four tractor books published by the American Society of Agricultural and Biological Engineers, including Farm tractors 1975-1995 and farm tractors 1995-2005. The four books may be obtained from ASABE by calling 800-695-2723.