The tractor is a Case 9-18 or a 10-18. Both models were painted green.
As early as 1910, there was a growing demand for small, lightweight tractors. Most companies were still producing large, heavyweight machines, as it was believed only such tractors would adequately compete with steam engines. Few people believed that a machine could replace the horse or mule as a power source. Against this backdrop, and a growing volume of books and articles on power farming, Case introduced the 9-18 tractor in 1916. It was a four cylinder vertical crossmount engine set in a steel frame. It had a 3.7/8 by 5 inch bore and stroke, operating at 900 RPM. The crossmount design made it easy to power the rear wheels by a gear drive. The tractor was completely enclosed, giving a clean, sculptured look with a sloping hood design. Both the 9-18 and 10-18 were painted green. The 9-18 was built only from 1916 to 1918, with total production of about 6,000 units. It is also of interest to note that a number of these tractors were exported to Europe and South America. The 9-18 was phased out in 1918 and replaced by the 10-18. The increased horsepower was obtained by speeding the engine 150 RPM to 1050 RPM. Basically, the 10-18 was similar except for minor improvements such as a cast frame, which would be used on future models. The tractors operated on kerosene, but were started on gasoline. The manifold was designed to pre-heat the fuel before drawn into the engine. Case pioneered a centrifugal air cleaner, and an air washer attached to the side of the engine. Under very dusty conditions, the dirt and water was to be changed once or more daily. Since the tractors operated only on steel wheels, the dust was a major detriment to all operating parts of the power train and engine. The 10-18 could pull a two-bottom plow and power a small thresher. Since the belt pulley operated directly from the crankshaft, there was a minimum loss of belt horsepower. The 10-18 was manufactured from 1918 to 1922. It is estimated about 9,000 tractors were manufactured. These two tractor models were the Case Company's entries to the small tractor market.
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