6 material differences · fewer than 12

Tractor oneDavid Brown 990 Implematic1961–1965No measured PTO figureTractor twoJ.I. Case 510-B1958–1959No measured PTO figure

Which should you choose?

We will not advise between these two machines, because they were not built in overlapping years (1961–1965; 1958–1959). 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

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

David Brown 990 Implematic and J.I. Case 510-B, field by field
Field	990 Implematic	510-B	Gap
Engine
Engine power, claimed claimed	52.0 hp	44.4 hp	+17% 990 Implematic
Engine declared	DAVID BROWN AD 4/47 A	CASE 164	differs
Displacement declared	3.04 L	2.70 L	+13% 990 Implematic
Maximum torque declared	141 lb·ft · 191 N·m	—	—
Transmission
Top speed declared	13.7 mph · 22 km/h	12.4–15.5 mph · 20–25 km/h	differs
Clutch declared	—	Pedal-operated single-plate clutch	—
Hydraulics & hitch
Pump flow declared	6.0 gpm · 22.7 L/min	3.0 gpm · 11.4 L/min	+99% 990 Implematic
Rear PTO speeds declared	540 rpm	540 rpm	—
Weight & dimensions
Unladen weight declared	4,771 lb · 2,164 kg	3,825 lb · 1,735 kg	+25% 990 Implematic
Wheelbase declared	76.7–78.7 in · 1,948–1,999 mm	78.5 in · 1,994 mm	—
Length declared	118.0–121.0 in · 2,997–3,073 mm	121.5 in · 3,086 mm	—
Width declared	64.0 in · 1,626 mm	63.3 in · 1,608 mm	—
Height, over the bonnet declared	56.0 in · 1,422 mm	63.4 in · 1,610 mm	+13% 510-B
Ground clearance declared	20.0 in · 508 mm	—	—
Turning radius, braked declared	10.5 ft · 3.20 m	—	—
Fuel tank declared	55.2 qt · 52.2 L	55.2 qt · 52.2 L	—

David Brown 990 Implematic sources

Source

Source: Traktorenlexikon, “David Brown 990 Implematic”

J.I. Case 510-B sources