Allis-Chalmers Model GRV, an orchard/vineyard variant of the Model G built in France, 1958.
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, ContinentalN62 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.
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.
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 USDASARE grant, is still in use at the Huguenot Farms in New Paltz, NY, USA.