11 material differences · fewer than 12

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

Which should you choose?

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

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

Fiat 666 (DT) and Renault 681 (S), field by field
Field	666 (DT)	681 (S)	Gap
Engine
Engine power, claimed claimed	67 hp	67 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 (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
Clutch declared	—	Dry LuK double clutch	—
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	6,305 lb · 2,860 kg	+11% 681 (S)
Wheelbase declared	90.7 in · 2,305 mm	93.5 in · 2,374 mm	—
Length declared	134.3 in · 3,412 mm	150.2 in · 3,814 mm	+12% 681 (S)
Width declared	77.2 in · 1,960 mm	73.2–89.0 in · 1,860–2,260 mm	differs
Height, over the cab declared	92.7 in · 2,355 mm	100.2 in · 2,545 mm	+8% 681 (S)
Ground clearance declared	19.5 in · 495 mm	17.9 in · 455 mm	+9% 666 (DT)
Turning radius, braked declared	12.6 ft · 3.84 m	11.7 ft · 3.56 m	+8% 666 (DT)
Fuel tank declared	77.1 qt · 73.0 L	86.6 qt · 82.0 L	+12% 681 (S)

Source

Source