Bührer PF-21 Super (A) vs Renault 651-4 (S)

10 material differences · fewer than 12

Tractor one

1968–1974

No measured PTO figure

Tractor two

1972–1987

No measured PTO figure

Which should you choose?

Read our verdict on the PF-21 Super (A) and the 651-4 (S) → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.

10 material differences · 4 fields identical or within 5%, which is not counted as material

Bührer PF-21 Super (A) and Renault 651-4 (S), field by field
Field	PF-21 Super (A)	651-4 (S)	Gap
Engine
Engine power, claimed claimed	66.1 hp	64.1 hp	—
Engine declared	FORD (GB) 2.514 E	MWM D 227-4	differs
Displacement declared	4.18 L	3.77 L	+11% PF-21 Super (A)
Maximum torque declared	183 lb·ft · 248 N·m	—	—
Transmission
Top speed declared	15.5 mph · 25 km/h	15.5 mph · 25 km/h	—
Clutch declared	Pedal-operated dry Buhrer double disc clutch between gearbox and group transmission	dry LuK double clutch	differs
Hydraulics & hitch
Pump flow declared	5.2 gpm · 19.5 L/min	6.9 gpm · 26.0 L/min	+33% 651-4 (S)
Pressure declared	—	2,321 psi · 160 bar	—
Three-point lift at ends declared	5,181 lb · 2,350 kg	4,938 lb · 2,240 kg	—
Rear PTO speeds declared	540/770 rpm	540 rpm	differs
Weight & dimensions
Unladen weight declared	5,357 lb · 2,430 kg	6,508 lb · 2,952 kg	+21% 651-4 (S)
Wheelbase declared	84.3 in · 2,140 mm	87.8 in · 2,231 mm	—
Length declared	129.5 in · 3,290 mm	149.8 in · 3,806 mm	+16% 651-4 (S)
Width declared	69.3 in · 1,760 mm	73.2 in · 1,860 mm	+6% 651-4 (S)
Height declared	65.7 in · 1,670 mm	88.6 in · 2,250 mm	+35% 651-4 (S)
Ground clearance declared	15.0 in · 380 mm	14.2 in · 360 mm	+6% PF-21 Super (A)
Turning radius, braked declared	10.9 ft · 3.33 m	—	—
Fuel tank declared	—	68.7 qt · 65.0 L	—

Source

Source