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The Model G is a small implement carrier tractor that was made by the Allis-Chalmers Manufacturing Company. At the time of its introduction the Model G was unique for its rear-mounted, Continental N62 engine. It was a four-cylinder engine with a 2⅜ × 3½ inch bore and stroke. The Model G was designed for small farms and vegetable gardeners, and had its own line of implements specifically designed for it, including ploughs, planters, and cultivators. The design of the Model G allowed for a great view of the belly-mounted implements. David Brown Ltd. in the UK introduced a very similar tractor in the mid-1950s called the 2D where the tubular frame acted as an air receiver for the compressed air implement lifting system. David Brown were also disappointed with the number of sales.
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The Model G was manufactured solely in the factory in Gadsden, Alabama, from 1948 to 1955. 29,976 units were built, which is less than Allis-Chalmers had originally hoped for. The Model G had a 5 gallon fuel tank, weighed 1,285 pounds, and was rated at 10 drawbar horsepower (Tested at 10.33 belt and 9.04 drawbar). The engine had a displacement of 62 cubic inches and was rated at 1800 RPMs. The transmission was a non-synchronized three-speed with reverse. An additional 'creeper' forward gear was standard equipment as well.
Electric conversions
The unique design of the Model G lends itself extremely well to electric vehicle conversion; a small DC electric motor replaces the original engine and bolts directly to the transmission housing through a commercially available adapter plate. A contactor and electronic motor controller are typically mounted to the same plate. Batteries are mounted in a box above the motor, where they are easily accessible for routine maintenance. The overall weight distribution mimics the tail-heavy design of the original tractor power train, which requires a visible nose counterweight. Over 100 Allis Chalmers model G tractors are known to have been converted as of 2009. The original prototype "flying beet" conversion, which was partially funded by a USDA SARE grant, is still in use at the Huguenot Farms in New Paltz, NY, USA.