9 material differences · fewer than 12
Tractor oneDavid Brown 990 Implematic1961–1965No measured PTO figureTractor twoInternational Harvester 5041961–1968No measured PTO figure
Which should you choose?
Read our verdict on the 990 Implematic and the 504 → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.
Field by field
9 material differences · 1 fields identical or within 5%, which is not counted as material
| Field | 990 Implematic | 504 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 52.0 hp | 45.3 hp | +15% 990 Implematic |
| Engine declared | DAVID BROWN AD 4/47 A | INTERNATIONAL HARVESTER C-153 | differs |
| Displacement declared | 3.04 L | 2.49 L | +22% 990 Implematic |
| Maximum torque declared | 141 lb·ft · 191 N·m | — | — |
| Transmission | |||
| Top speed declared | 13.7 mph · 22 km/h | 18.6 mph · 30 km/h | +36% 504 |
| Clutch declared | — | pedal-operated dry single-plate clutch | — |
| Hydraulics & hitch | |||
| Pump flow declared | 6.0 gpm · 22.7 L/min | 12.0 gpm · 45.5 L/min | +100% 504 |
| Rear PTO speeds declared | 540 rpm | 540 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 4,771 lb · 2,164 kg | 4,458 lb · 2,022 kg | +7% 990 Implematic |
| Wheelbase declared | 76.7–78.7 in · 1,948–1,999 mm | 73.0 in · 1,854 mm | differs |
| Length declared | 118.0–121.0 in · 2,997–3,073 mm | 132.8 in · 3,372 mm | differs |
| Width declared | 64.0 in · 1,626 mm | 83.0–96.5 in · 2,108–2,451 mm | differs |
| 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 | 90.0 qt · 85.2 L | +63% 504 |
Height is not in this table. It is not one measurement: the sources measure it to different points — over the cab on some machines, over the steering wheel or the exhaust on others — and the same tractor measured two ways can differ by most of a metre. It appears here only when both machines' figures carry the point they were measured to and it is the same point, which is not the case for these two. Each machine's own page prints its height as its source gives it.
David Brown 990 Implematic sources
- Source: Traktorenlexikon, “David Brown 990 Implematic”
International Harvester 504 sources
- Source: Traktorenlexikon, “IHC 504”
- Source: Traktorenlexikon, “McCormick Farmall-H”