10 material differences · fewer than 12

Tractor oneFiat 666 (DT)1982–1986No measured PTO figureTractor twoRenault 681-4 (S)1979–1986No measured PTO figure

Which should you choose?

Read our verdict on the 666 (DT) and the 681-4 (S) → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.

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

Fiat 666 (DT) and Renault 681-4 (S), field by field
Field	666 (DT)	681-4 (S)	Gap
Engine
Engine power, claimed claimed	67 hp	67.1 hp	—
Engine declared	FIAT-IVECO 8045.02.276 or 376	MWM D 227-4	differs
Displacement declared	3.46 L	3.77 L	+9% 681-4 (S)
Maximum torque declared	161 lb·ft · 218 N·m	164 lb·ft · 223 N·m	—
Transmission
Top speed declared	15.5–18.6 mph · 25–30 km/h	15.5 mph · 25 km/h	differs
Hydraulics & hitch
Pump flow declared	—	7.6 gpm · 28.8 L/min	—
Pressure declared	—	2,321 psi · 160 bar	—
Three-point lift, at the coupling points declared	6,923 lb · 3,140 kg	5,313 lb · 2,410 kg	+30% 666 (DT)
Rear PTO speeds declared	540 rpm	540 rpm	—
Weight & dimensions
Unladen weight declared	5,688 lb · 2,580 kg	7,187 lb · 3,260 kg	+26% 681-4 (S)
Wheelbase declared	90.7 in · 2,305 mm	94.9 in · 2,410 mm	—
Length declared	134.3 in · 3,412 mm	156.3 in · 3,970 mm	+16% 681-4 (S)
Width declared	77.2 in · 1,960 mm	64.6–89.0 in · 1,641–2,260 mm	differs
Height, over the cab declared	92.7 in · 2,355 mm	96.1 in · 2,441 mm	—
Ground clearance declared	19.5 in · 495 mm	14.2 in · 360 mm	+38% 666 (DT)
Turning radius, braked declared	12.6 ft · 3.84 m	16.1 ft · 4.90 m	+28% 681-4 (S)
Fuel tank declared	77.1 qt · 73.0 L	86.6 qt · 82.0 L	+12% 681-4 (S)

Source

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