8 material differences · fewer than 12

Tractor oneLamborghini R-1556 DT1981–1984No measured PTO figureTractor twoURSUS 16341990–2009No measured PTO figure

Which should you choose?

We will not advise between these two machines, because they were not built in overlapping years (1981–1984; 1990–2009). The figures below are side by side so you can judge them yourself; each says whether it was measured, claimed or declared by its source.

Field by field

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

Lamborghini R-1556 DT and URSUS 1634, field by field
Field	R-1556 DT	1634	Gap
Engine
Engine power, claimed claimed	153 hp	153 hp	—
Engine declared	HÜRLIMANN/SAURER H-1106/15-Turbo	Z.T.S.-MARTIN Z-8602.12	differs
Displacement declared	6.84 L	6.84 L	—
Maximum torque declared	434 lb·ft · 588 N·m	277 lb·ft · 376 N·m	+56% R-1556 DT
Transmission
Top speed declared	18.6 mph · 30 km/h	16.8–18.6 mph · 27–30 km/h	differs
Clutch declared	—	Pedal-operated, hydraulic-dry ZTS-MARTIN single-disc clutch	—
Hydraulics & hitch
Pump flow declared	14.3 gpm · 54.0 L/min	—	—
Pressure declared	—	2,828 psi · 195 bar	—
Rear PTO speeds declared	540/1000 rpm	540/1000 rpm	—
Weight & dimensions
Unladen weight declared	13,889 lb · 6,300 kg	13,658 lb · 6,195 kg	—
Maximum permissible mass declared	—	18,739 lb · 8,500 kg	—
Wheelbase declared	113.3 in · 2,877 mm	106.5 in · 2,706 mm	+6% R-1556 DT
Length declared	178.1 in · 4,525 mm	177.4 in · 4,505 mm	—
Width declared	95.3 in · 2,420 mm	89.3 in · 2,267 mm	+7% R-1556 DT
Height, over the cab declared	110.2 in · 2,800 mm	119.3 in · 3,030 mm	+8% 1634
Ground clearance declared	20.1 in · 510 mm	15.6 in · 395 mm	+29% R-1556 DT
Turning radius, braked declared	—	17.6 ft · 5.35 m	—
Fuel tank declared	126.8 qt · 120.0 L	169.1 qt · 160.0 L	+33% 1634

Lamborghini R-1556 DT sources

Source

Source: Traktorenlexikon, “Lamborghini 1556 DT”

URSUS 1634 sources