Bührer PF-21 Super (A)
Built: 1968–1974 · Series: P-SUPER
More machines from model year 1968
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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.
Read on 3 more paragraphs
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)
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 67 hp (49.3 kW)correct |
| Rated speed | 1,900 rpmcorrect |
| Torque | 248 Nmcorrect |
| Speed at max. torque | 1,520 rpmcorrect |
| Cylinders | 4correct |
| Displacement | 4,184 cm³correct |
| Bore | 111.76 mmcorrect |
| Stroke | 106.68 mmcorrect |
| Compression ratio | 16.5correct |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 3,290 mmcorrect |
|---|---|
| Width | 1,760 mmcorrect |
| Height | 1,670 mmcorrect |
| Wheelbase | 2,140 mmcorrect |
| Ground clearance | 380 mmcorrect |
| Unladen weight | 2,430 kgcorrect |
Drivetrain and chassis
| Drive | rear- or four-wheel drivecorrect |
|---|---|
| Gearbox | 15 V/3 Rcorrect |
| Forward gears | 15correct |
| Reverse gears | 3correct |
| Front tyres | 6.50-16 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 | 480 (A: 40)correct |
Other data
| Linkage category | Cat Icorrect |
|---|
Where this model stands
Power-to-weight ratio: 20.3 kW/t (49 kW / 2.4 t)
Power class: Universal (40–100 hp)
Stronger than 46% 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 PF-21 Super (A) have?
The Bührer PF-21 Super (A) delivers 67 hp.
How much does the Bührer PF-21 Super (A) weigh?
The unladen weight is 2,430 kg.
What engine does the Bührer PF-21 Super (A) have?
4 cylinders, 4,184 cm³ displacement, Diesel.
How fast does the Bührer PF-21 Super (A) go?
Top speed is 25 km/h.
What are the dimensions of the Bührer PF-21 Super (A)?
3,290 mm × 1,760 mm × 1,670 mm.
When was the Bührer PF-21 Super (A) built?
Production years: 1968–1974.
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 29 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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