Allis Chalmers Baureihe-L
1 model in this series
Allis-Chalmers 12-20/15-25 – Series L from Milwaukee (1921–1927): four-cylinder engine with 4,599 cm³ displacement for petrol or kerosene, 16 kW/21.7 hp at 1,100 rpm
Allis-Chalmers of Milwaukee, Wisconsin, was one of the large American farm machinery manufacturers of the first half of the 20th century. Series L, with the type 12-20/15-25, was built from 1921 to 1927; the double numerical designation follows the period's American practice of stating a tractor's drawbar rating and belt-pulley rating.
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The 12-20/15-25 is powered by a water-cooled four-cylinder engine with 4,599 cm³ displacement, running on petrol or kerosene, producing 16 kW or 21.7 hp at 1,100 rpm. The machine is 3,315 mm long, 1,372 mm wide and 1,600 mm high, weighs 2,064 kg and has a design top speed of 5 km/h.
At 5 km/h, the 12-20/15-25 falls into driving licence category L. Such a low road speed was typical of 1920s tractors, which, besides fieldwork, also drove stationary machines such as threshers through the belt pulley; running on either petrol or kerosene was common among American tractors of this period.
On a tractor this old, what matters most when buying used is the condition of the frame and steel wheels, the state of the carburettor built for switching fuels, and the radiator and water pump; parts are practically available only through collectors, museums and specialist reproduction makers. It is also worth checking the condition of the wheel rims and spokes, which on the steel wheels of this period are often bent or cracked.
Sources: SpecCodex-Register: Kennwerte des Modells Allis-Chalmers 12-20/15-25
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