4 material differences · fewer than 12
Tractor oneInternational Harvester 6741973–1975No measured PTO figureTractor twoInternational Harvester 6841977–1981No measured PTO figure
Which should you choose?
We will not advise between these two machines, because they were not built in overlapping years (1973–1975; 1977–1981). 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
4 material differences · 10 fields identical or within 5%, which is not counted as material
| Field | 674 | 684 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 64.1 hp | 68.0 hp | +6% 684 |
| Engine declared | INTERNATIONAL-HARVESTER D-239 | INTERNATIONAL-HARVESTER D-239 | — |
| Displacement declared | 3.91 L | 3.91 L | — |
| Maximum torque declared | 153 lb·ft · 207 N·m | 162 lb·ft · 220 N·m | +6% 684 |
| Transmission | |||
| Top speed declared | 15.5–18.6 mph · 25–30 km/h | 15.5 mph · 25 km/h | differs |
| Clutch declared | Pedal-operated dry LAYCOCK single-plate clutch | — | — |
| Hydraulics & hitch | |||
| Pump flow declared | 11.1–12.6 gpm · 42.1–47.7 L/min | 9.9 gpm · 37.5 L/min | differs |
| Pressure declared | — | 2,698 psi · 186 bar | — |
| Rear PTO speeds declared | 540/1000 rpm | 540/1000 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 5,106 lb · 2,316 kg | 5,181 lb · 2,350 kg | — |
| Wheelbase declared | 84.5 in · 2,146 mm | 88.0 in · 2,235 mm | — |
| Length declared | 140.6 in · 3,570 mm | 146.5 in · 3,720 mm | — |
| Width declared | 68.9 in · 1,750 mm | 70.1 in · 1,780 mm | — |
| Height, over the exhaust declared | 86.2 in · 2,190 mm | 99.6 in · 2,530 mm | +16% 684 |
| Ground clearance declared | 14.4 in · 365 mm | 14.6 in · 370 mm | — |
| Turning radius, braked declared | 10.9 ft · 3.31 m | 10.9 ft · 3.33 m | — |
| Fuel tank declared | 81.2 qt · 76.8 L | 81.4 qt · 77.0 L | — |
International Harvester 674 sources
Source
- Source: Traktorenlexikon, “IHC 674”
- Source: Traktorenlexikon, “IHC 574”
- Source: Traktorenlexikon, “IHC 674 (USA)”
International Harvester 684 sources
Source
- Source: Traktorenlexikon, “IHC 684”
- Source: Traktorenlexikon, “IHC 574”