11 material differences · fewer than 12
Tractor oneInternational Harvester D-4401958–1959No measured PTO figureTractor twoPorsche-Diesel S 3091961–1963No measured PTO figure
Which should you choose?
Read our verdict on the D-440 and the S 309 → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.
Field by field
11 material differences · 2 fields identical or within 5%, which is not counted as material
| Field | D-440 | S 309 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 39.4 hp | 39.6 hp | — |
| Engine declared | INTERNATIONAL-HARVESTER DD-132 S | Porsche-Diesel F 309 | differs |
| Displacement declared | 2.18 L | 2.63 L | +21% S 309 |
| Maximum torque declared | 112 lb·ft · 152 N·m | 102 lb·ft · 138 N·m | +10% D-440 |
| Transmission | |||
| Top speed declared | 12.4 mph · 20 km/h | 14.7 mph · 23.6 km/h | +18% S 309 |
| Clutch declared | — | Single-disc dry clutch with oil-hydraulic Voith fluid coupling | — |
| Hydraulics & hitch | |||
| Pump flow declared | 6.3 gpm · 24.0 L/min | 4.0 gpm · 15.0 L/min | +60% D-440 |
| Pressure declared | 2,119 psi · 146 bar | — | — |
| Rear PTO speeds declared | 540 rpm | 540 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 4,277 lb · 1,940 kg | 3,197 lb · 1,450 kg | +34% D-440 |
| Maximum permissible mass declared | 7,033 lb · 3,190 kg | — | — |
| Wheelbase declared | 74.0 in · 1,880 mm | 69.7 in · 1,770 mm | +6% D-440 |
| Length declared | 118.5 in · 3,010 mm | 111.8 in · 2,840 mm | +6% D-440 |
| Width declared | 73.4 in · 1,865 mm | 46.1 in · 1,170 mm | +59% D-440 |
| Ground clearance declared | 16.8 in · 427 mm | 14.2 in · 360 mm | +19% D-440 |
| Turning radius, braked declared | 9.8 ft · 3.00 m | — | — |
| Fuel tank declared | 58.1 qt · 55.0 L | 42.3 qt · 40 L | +38% D-440 |
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.
International Harvester D-440 sources
- Source: Traktorenlexikon, “McCormick D-440 Standard”
Porsche-Diesel S 309 sources
- Source: Traktorenlexikon, “Porsche-Diesel Super S309”