The first model in the Case letter series was the L, introduced in 1929. It was designed to compete with the very successful John Deere D model. Besides plowing tasks, its use included driving a threshing machine via a belt pulley. The 6.6-liter, 4-cylinder petrol engine produced 45 horsepower. The final drive was implemented using roller chains. There were three gears, and the clutch was a manually operated, oil-bathed 2-plate clutch. In 1934, pneumatic tires became available. The industrial model LI featured steering brakes, 4 gears, and electric start.

A few months later, a smaller model C was released, designed for a 3×14" plow. The technical solutions were exactly the same, but the tractor was overall scaled down. However, the brake on the C was manually operated. The engine was 4.25 liters, and the power take-off output was rated at 27 horsepower. The Nebraska test measured 29.8 horsepower. A parallel model to the C was the row-crop model CC, offered in two versions. The 3-wheel version had the front wheel positioned in front of the front, and the 4-wheel version featured a wide, adjustable-width front axle. Steering brakes were standard on the CC. Optional equipment included power take-off, electrical system, and pneumatic tires. Starting in 1935, a manually operated lifting device became available. Other parallel models to the C included the orchard version CO and the industrial model CI.

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