Bührer SUPER
1 model in this series
Bührer RP-21 Super (A): Swiss standard tractor with a water-cooled 4,067cc four-cylinder diesel, 53 kW and 287 Nm of torque
Bührer was a Swiss tractor manufacturer based in Hinwil in the canton of Zurich and ranked among the pioneers of tractor building in Switzerland. The company built agricultural tractors and adapted its machines to the small, often sloping farms of the Swiss Mittelland and the pre-Alps. The Super series formed the manufacturer's offering at the upper end of its power range.
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The RP-21 Super (A) carries a water-cooled four-cylinder diesel engine with 4,067 cc of displacement, producing 53 kW (72 hp) at 2,000 rpm and delivering 287 Nm of torque. At 3,360 mm long, 1,850 mm wide and with a 2,147 mm wheelbase, the machine has an unladen weight of 2,634 kg; overall height is 1,720 mm. Its design top speed of 25 km/h places the Super in the slower category of standard agricultural tractors.
With this engine and this weight, the Super belongs to the class of medium-heavy standard tractors used for ploughing, cultivating and haulage work on mid-sized farms. A top speed of 25 km/h falls under the German licence category L, which covers vehicles up to 40 km/h. The water-cooled four-cylinder was, for its time, a rugged, easily maintained solution that runs evenly even under sustained PTO load.
When buying a used Bührer Super, the condition of the cooling system comes first: on machines of this age, the water pump, radiator and hoses are often leaking or scaled up. Also worth checking are the clutch, the seals of the injection pump and the condition of the rear-axle seals, since oil loss at this point is common on old Bührer tractors. Corrosion on the mudguards, frame and mounted parts is another important check point before buying, given the machine's age.
Sources: SpecCodex-Register: Kennwerte des Modells Bührer RP-21 Super (A)
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