11 material differences · fewer than 12

Tractor oneDavid Brown 9001957–1958No measured PTO figureTractor twoSOMECA SOM-4111964–1965No measured PTO figure

Which should you choose?

Read our verdict on the 900 and the SOM-411 → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.

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

David Brown 900 and SOMECA SOM-411, field by field
Field	900	SOM-411	Gap
Engine
Engine power, claimed claimed	40.1 hp	40.5 hp	—
Engine declared	DAVID BROWN AK-4/30 J or AG-4/30 J	O.M.-FIAT 615.000	differs
Displacement declared	2.71 L	2.27 L	+19% 900
Maximum torque declared	—	101 lb·ft · 137 N·m	—
Transmission
Top speed declared	15.5 mph · 25 km/h	14.3 mph · 23 km/h	+9% 900
Clutch declared	Pedal-operated dry BORG & BECK single-plate clutch	Pedal operated dry two stage double clutch	differs
Hydraulics & hitch
Pump flow declared	10.7 gpm · 40.5 L/min	4.4 gpm · 16.5 L/min	+145% 900
Pressure declared	1,493 psi · 103 bar	2,843 psi · 196 bar	+90% SOM-411
Rear PTO speeds declared	540 rpm	540 rpm	—
Weight & dimensions
Unladen weight declared	3,999 lb · 1,814 kg	3,472 lb · 1,575 kg	+15% 900
Wheelbase declared	75.2 in · 1,911 mm	71.7 in · 1,820 mm	—
Length declared	116.3 in · 2,953 mm	113.4 in · 2,880 mm	—
Width declared	48.5–65.0 in · 1,231–1,651 mm	62.2–88.6 in · 1,580–2,250 mm	differs
Height, over the steering wheel declared	54.5 in · 1,384 mm	58.7 in · 1,490 mm	+8% SOM-411
Ground clearance declared	16.0 in · 406 mm	18.9 in · 480 mm	+18% SOM-411
Turning radius, braked declared	9.6 ft · 2.91 m	9.3 ft · 2.84 m	—
Fuel tank declared	55.2 qt · 52.2 L	51.8 qt · 49.0 L	+7% 900

Source

Source