Klöckner Humboldt Deutz AG D 06
1 model in this series
Klöckner-Humboldt-Deutz D 2506 (D 06 series): air-cooled two-cylinder diesel with 16 kW for smallholder and municipal use, built from 1968 to 1974
Klöckner-Humboldt-Deutz AG, headquartered in Cologne, was for decades the manufacturer that shaped German agricultural machinery more than any other through air-cooled diesel engines. Under the Deutz brand, the company fitted its tractors as standard with this cooling method, which needs no cooling water, antifreeze or water pump and suited smaller, often changing operations particularly well.
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The D 2506 carries an air-cooled two-cylinder diesel engine of 1,884 cm³ displacement, delivering 16 kW at 2,100 rpm. At a kerb weight of 1,710 kg, the tractor measures 3,340 mm in length, 1,600 mm in both height and width, and runs on a wheelbase of 1,865 mm. Its design top speed is 20 km/h.
With a design top speed of 20 km/h, a tractor of this class falls under Germany's L driving licence category, which covers vehicles up to 40 km/h. The two-cylinder engine without a water cooling circuit noticeably reduces maintenance compared with water-cooled units, but it does require a functioning fan and a clean oil cooler, since cooling air otherwise fails to circulate adequately.
When buying a used two-cylinder air-cooled tractor of this age, it is worth checking the cylinder block's cooling fins and the fan: bent fins or a jammed fan lead to overheating. The condition of the hydraulic pump, the tightness of the axles and rust on the chassis deserve equal attention. Parts for air-cooled Deutz engines in this power class are still stocked by specialist suppliers.
Sources: SpecCodex-Register: Kennwerte des Modells Klöckner-Humboldt-Deutz D 2506, DEUTZ (manufacturer)
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