Bührer P-SUPER
1 model in this series
Bührer PF-21 Super: four-cylinder diesel of the P-Super range, 49.3 kW (67 hp), 248 Nm torque, 2,430 kg unladen weight, built 1968 to 1974
Bührer, a Swiss tractor maker based in Hinwil in the canton of Zurich, ran the P range as a Super line alongside simpler Standard ranges such as O-Standard or M/N Standard, competing with brands such as Hürlimann and Meili. The PF-21 Super (A) was built from 1968 to 1974, in the same period as the six-cylinder GM-29 Super-Six and the smaller OP-17 Standard.
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The PF-21 carries a water-cooled four-cylinder diesel engine of 4,184 cm³ displacement, producing 49.3 kW (67 hp) at 1,900 rpm and developing 248 Nm of torque. With an unladen weight of 2,430 kg, a length of 3,290 mm, a width of 1,760 mm, a height of 1,670 mm and a wheelbase of 2,140 mm, it reaches a top speed of 25 km/h.
At 25 km/h the PF-21 falls within driving licence category L up to 40 km/h. At 67 hp, the PF-21 as a Super version sat between the marque's smaller Standard four-cylinder and its big six-cylinder, covering the upper mid class for tillage and draft work on medium Swiss farms, heavier work than plain yard duties.
When buying second-hand, the operating hours and the condition of the injection pump, the tightness of the engine and cooling system, and wear on the clutch and gearbox after years with mounted implements matter. Rust on the chassis and sheet-metal parts, together with a traceable maintenance history, give further insight into how hard this rarer model has been worked, and parts usually mean searching among collectors.
Sources: SpecCodex-Register: Kennwerte des Modells Bührer PF-21 Super (A)
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