Fahr KT-Reihe
1 model in this series
Fahr KT 10 D: single-cylinder diesel light tractor from Gottmadingen with thermosiphon cooling, 10 hp and a weight of only 518 kg, built from 1952 to 1959
Fahr, the tractor and combine-harvester maker from Lake Constance, built the KT 10 D between 1952 and 1959 – during the reconstruction phase of West German farming, when many small and medium farms bought their own, affordable motorised tractor for the first time. The KT range covered the lower end of Fahr's line-up.
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The single-cylinder diesel engine of 502cc produces 10 hp at 2,200 rpm and is cooled by thermosiphon action without a water pump. At only 518 kg, 2,400 mm long, 1,030 mm high and 1,030 mm wide, the KT 10 D counts among the lightest farm tractors of its time; the top speed is 15 km/h.
At just over half a tonne, the KT 10 D was built for small plots and market gardens, not for heavy tillage. Thermosiphon cooling relies solely on the natural circulation of heated coolant without a pump, reducing the number of components and the maintenance effort compared with larger tractors – a deliberate trade-off in favour of simplicity and a low purchase price.
When buying such a light single-cylinder tractor second-hand, the patency of the thermosiphon cooling circuit matters most, as scale or rust deposits lead to overheating faster without a pump to assist circulation. Also worth checking are the injection pump and the compression of the single cylinder, and the light chassis for distortion, which is not uncommon after decades of use on small plots.
Sources: SpecCodex-Register: Kennwerte des Modells KT 10 D
Models
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.