4 material differences · fewer than 12
Tractor oneInternational Harvester 15661974–1976No measured PTO figureTractor twoInternational Harvester 15861976–1981No measured PTO figure
Which should you choose?
Read our verdict on the 1566 and the 1586 → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.
Field by field
4 material differences · 9 fields identical or within 5%, which is not counted as material
| Field | 1566 | 1586 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 161 hp | 161 hp | — |
| Engine declared | INTERNATIONAL HARVESTER DT-436 | INTERNATIONAL HARVESTER DT-436 | — |
| Displacement declared | 7.14 L | 7.14 L | — |
| Maximum torque declared | — | 456 lb·ft · 618 N·m | — |
| Transmission | |||
| Top speed declared | 18.6 mph · 30 km/h | 18.6 mph · 30 km/h | — |
| Clutch declared | Pedal-operated ceramic clutch | — | — |
| Hydraulics & hitch | |||
| Pump flow declared | 12.0 gpm · 45.5 L/min | 12.0 gpm · 45.4 L/min | — |
| Rear PTO speeds declared | 1000 rpm | 1000 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 15,194 lb · 6,892 kg | 15,119 lb · 6,858 kg | — |
| Wheelbase declared | 104.8 in · 2,662 mm | 104.8 in · 2,662 mm | — |
| Length declared | 168.0 in · 4,267 mm | 169.0 in · 4,293 mm | — |
| Width declared | 112.0 in · 2,845 mm | 102.0 in · 2,591 mm | +10% 1566 |
| Ground clearance declared | 17.0 in · 432 mm | 14.0 in · 356 mm | +21% 1566 |
| Turning radius, braked declared | 11.9 ft · 3.63 m | 11.2 ft · 3.40 m | +7% 1566 |
| Fuel tank declared | 168.0 qt · 159.0 L | 252.0 qt · 238.5 L | +50% 1586 |
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 1566 sources
Source
- Source: Traktorenlexikon, “Farmall Farmall 1566”
- Source: Traktorenlexikon, “IHC 1466”
- Source: Traktorenlexikon, “IHC 1566”
International Harvester 1586 sources
Source
- Source: Traktorenlexikon, “IHC 1586”
- Source: Traktorenlexikon, “IHC 1466”