8 material differences · fewer than 12
Tractor oneInternational Harvester 6641972–1973No measured PTO figureTractor twoInternational Harvester 7841977–1981No measured PTO figure
Which should you choose?
Read our verdict on the 664 and the 784 → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.
Field by field
8 material differences · 4 fields identical or within 5%, which is not counted as material
| Field | 664 | 784 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 61.2 hp | 75.9 hp | +24% 784 |
| Engine declared | INTERNATIONAL-HARVESTER D-239 | INTERNATIONAL-HARVESTER D-246 | differs |
| Displacement declared | 3.91 L | 4.03 L | — |
| Maximum torque declared | 171 lb·ft · 232 N·m | 159 lb·ft · 216 N·m | +7% 664 |
| Transmission | |||
| Top speed declared | 18.6 mph · 30 km/h | 15.5 mph · 25 km/h | +20% 664 |
| Clutch declared | Pedal operated dry single plate clutch | — | — |
| Hydraulics & hitch | |||
| Pump flow declared | 12.0 gpm · 45.4 L/min | 10.1 gpm · 38.2 L/min | +19% 664 |
| Pressure declared | — | 2,698 psi · 186 bar | — |
| Rear PTO speeds declared | 540/1000 rpm | 540/1000 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 5,948 lb · 2,698 kg | 5,238 lb · 2,376 kg | +14% 664 |
| Wheelbase declared | 74.0 in · 1,880 mm | 88.0 in · 2,235 mm | +19% 784 |
| Length declared | 139.0 in · 3,531 mm | 144.1 in · 3,660 mm | — |
| Width declared | 70.0 in · 1,778 mm | 68.9 in · 1,750 mm | — |
| Ground clearance declared | 19.0 in · 483 mm | 15.6 in · 396 mm | +22% 664 |
| Turning radius, braked declared | — | 11.5 ft · 3.51 m | — |
| Fuel tank declared | 70.0 qt · 66.2 L | 81.4 qt · 77.0 L | +16% 784 |
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 664 sources
Source
- Source: Traktorenlexikon, “IHC 664”
- Source: Traktorenlexikon, “IHC 574”
International Harvester 784 sources
Source
- Source: Traktorenlexikon, “IHC 784”