Fahr HG
1 model in this series
Fahr HG 25: water-cooled two-cylinder farm tractor from Gottmadingen built to run on wood, coal and peat, with 25 hp and a weight of 2,730 kg, built from 1942 to 1948
Fahr, the tractor and combine-harvester maker from Gottmadingen on Lake Constance, built the HG 25 between 1942 and 1948 – spanning the end of the war and into the early postwar years. The register lists wood, coal and peat as the fuel, pointing to a conversion to producer gas (wood gas), a common measure in this period given scarce and rationed diesel and petrol supplies.
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The water-cooled two-cylinder engine of 3,940cc produces 25 hp (18.4 kW) at 1,500 rpm. At 2,730 kg, 3,455 mm long, 1,935 mm high and 1,590 mm wide, the HG 25 was a sturdy tractor for its time; the wheelbase is 2,220 mm and the top speed only 8 km/h.
Producer-gas tractors carried a generator that converted solid fuels such as wood, coal or peat into a combustible gas that powered the engine instead of diesel or petrol. This gave independence from liquid fuel but cost power and required constant attention to the generator, which, together with the large displacement, explains the comparatively modest output and the low top speed.
With such a rare vehicle built around wartime and postwar technology, the condition of the water-cooled engine block and cooling system for corrosion matters most, as an original wood-gas generator is usually missing today, or the engine has long since been converted back to ordinary diesel operation. Matching original generator parts today can realistically only be found through museums and restoration specialists.
Sources: SpecCodex-Register: Kennwerte des Modells HG 25
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