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The patented hydraulic drive remained but it was improved upon by upping the maximum operating pressure from 1600 PSI to 2150 PSI at the travel valve and 2250 at the rear PTO valve, used to power attachments. The early 1970s saw the end of the older "elephant ear" style of rear fenders on the Big Wheel tractors in favor of a flat top fender.
The F-12 was a smaller, modernized version of the earlier Farmall Regular, developed from a prototype designated the F-10.To reduce mechanical complexity and to improve transmission efficiency, the Regular's portal axle rear wheel arrangement was changed to a straight axle, with larger wheels to provide ground clearance.
Differential braking for rear wheels would allow tight, controlled turns. An experimental model was developed in 1920. By 1923, prototypes of the rear-wheel-drive tractor with narrow front wheels were working crops. Production began in 1924, with tractors selling for $825. Tractors were marketed with a range of attachments for various duties.
The top road speed was 17 miles per hour (27 km/h), but the fifth gear was not enabled on tractors sold with steel wheels, an option present in early models and during World War II, when rubber was rationed.The standard front wheels were closely-spaced nose wheels, with options for a single wheel or a wide front axle. Rear wheels could be ...
A five-speed sliding-gear transmission was standard, with fifth gear disabled on tractors that were delivered with steel wheels. Overall weight for single rear wheel tractors was about 3,800 pounds (1,700 kg). The W-4 was first produced in 1940. [2] [3] The industrial version was the International Harvester I-4.
The Farmall C is a small two-plow row crop tractor produced by International Harvester under the Farmall brand from 1948 to 1951. The C was developed from the Farmall B as a slightly larger, more versatile implement, raising and moving the B's offset operator seat to the centerline and increasing the wheel size to allow a straight, widely-adjustable rear axle.