The BM-20 was the agricultural tractor of its day for medium-sized and large farms. It was powerful enough to pull a three-furrow 12-inch plough in moderately compacted soil. The BM could also handle the towed sack threshers that became very popular after the war.
With its rubber tires, higher travel speeds and better brakes, the power-packed BM-20 was also used for towing in forestry and increasingly for road haulage.
Collaborations between Munktell and Volvo had been going on since the early 1940s. The joinly-developed gearbox formed the basis of the new tractor models. It was the BM-20, whose engine was based on the engine of its predecessors, the BM-2 and BM-3. In the Volvo version the BM-20 was first given a carburettor engine and then a Volvo Hesselman engine and was called the Volvo T 43. The BM-20 was fitted with an electric starter motor and electric heating coils for heating the hot bulbs. This required six-volt batteries. The tractor was also available with compressed-air starting and only one battery to power the lighting. In1951 the recommended price was SEK 13 110.
The tractor at the Museum with serialnumber 9022, was restored by the Engman family of Hällberga outside of Eskilstuna. The museum's own BM-20 is on show in the Munktell Arena.
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Engine 2-cyl, 2-stroke hot bulb engine
Engine output 41 hp, 1 050 r/min
Gearbox/ speed 2 forward, max 20,5 km/h
1 reverse, max 3,0 km/h
Fuel tank 75 L
Cooling system 22 L
Weight 2 650 kg