Bührer RP-21 Super (A)
Built: 1969–1975 · Series: SUPER
More machines from model year 1969
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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)
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 72 hp (53 kW)correct |
| Rated speed | 2,000 rpmcorrect |
| Torque | 287 Nmcorrect |
| Speed at max. torque | 1,300 rpmcorrect |
| Cylinders | 4correct |
| Displacement | 4,067 cm³correct |
| Bore | 100.96 mmcorrect |
| Stroke | 127 mmcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 3,360 mmcorrect |
|---|---|
| Width | 1,850 mmcorrect |
| Height | 1,720 mmcorrect |
| Wheelbase | 2,147 mmcorrect |
| Ground clearance | 410 mmcorrect |
| Unladen weight | 2,634 kgcorrect |
Drivetrain and chassis
| Drive | rear- or four-wheel drivecorrect |
|---|---|
| Gearbox | 15 V/3 Rcorrect |
| Forward gears | 15correct |
| Reverse gears | 3correct |
| Front tyres | 6.00-16 ASF (A: 10.5-18 AS)correct |
| Rear tyres | 13-28 AScorrect |
| Top speed | 25 km/hcorrect |
Origin and approval
| Construction | combined frame and unit constructioncorrect |
|---|---|
| Units built | 367 (A: 39)correct |
Other data
| Linkage category | Cat Icorrect |
|---|
Where this model stands
Power-to-weight ratio: 20.1 kW/t (53 kW / 2.6 t)
Power class: Universal (40–100 hp)
Stronger than 50% of the tractors in the register — out of 15,663 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the Bührer RP-21 Super (A) have?
The Bührer RP-21 Super (A) delivers 72 hp.
How much does the Bührer RP-21 Super (A) weigh?
The unladen weight is 2,634 kg.
What engine does the Bührer RP-21 Super (A) have?
4 cylinders, 4,067 cm³ displacement, Diesel.
How fast does the Bührer RP-21 Super (A) go?
Top speed is 25 km/h.
What are the dimensions of the Bührer RP-21 Super (A)?
3,360 mm × 1,850 mm × 1,720 mm.
When was the Bührer RP-21 Super (A) built?
Production years: 1969–1975.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check the weights in the papers against the figures here — attachments change them.
- Check front and rear tyre sizes: mismatched pairs strain the drivetrain.
- Shift the gearbox cold and warm — jumps only show up at temperature.
- Load the hydraulics and watch for sag.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 28 individual figures for this model. They come from 2 recorded sources; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.