8 material differences · fewer than 12
Tractor oneInternational Harvester Farmall 10661971–1976No measured PTO figureTractor twoInternational Harvester 36881981–1985No measured PTO figure
Which should you choose?
We will not advise between these two machines, because the drive differs (2WD; Two-wheel or four-wheel drive); they were not built in overlapping years (1971–1976; 1981–1985). 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
8 material differences · 5 fields identical or within 5%, which is not counted as material
| Field | Farmall 1066 | 3688 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 115.5 hp | 113.5 hp | — |
| Engine declared | INTERNATIONAL HARVESTER DT-414 | INTERNATIONAL HARVESTER DT-436 | differs |
| Displacement declared | 6.78 L | 7.14 L | +5% 3688 |
| Transmission | |||
| Top speed declared | 18.6 mph · 30 km/h | 19.9 mph · 32 km/h | +7% 3688 |
| Hydraulics & hitch | |||
| Pump flow declared | 12.0 gpm · 45.5 L/min | 18.0 gpm · 68.1 L/min | +50% 3688 |
| Rear PTO speeds declared | 540/1000 rpm | 540/1000 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 12,145 lb · 5,509 kg | 13,201 lb · 5,988 kg | +9% 3688 |
| Wheelbase declared | 104.8 in · 2,662 mm | 104.8 in · 2,662 mm | — |
| Length declared | 165.0 in · 4,191 mm | 184.0 in · 4,674 mm | +12% 3688 |
| Width declared | 98.0 in · 2,489 mm | 102.0 in · 2,591 mm | — |
| Ground clearance declared | 16.0 in · 406 mm | 13.0 in · 330 mm | +23% Farmall 1066 |
| Turning radius, braked declared | 12.0 ft · 3.66 m | 11.7 ft · 3.58 m | — |
| Fuel tank declared | 168.0 qt · 159.0 L | 200.0 qt · 189.3 L | +19% 3688 |
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 Farmall 1066 sources
- Source: Traktorenlexikon, “IHC 1066”
- Source: Traktorenlexikon, “Farmall Farmall 1066”
International Harvester 3688 sources
- Source: Traktorenlexikon, “IHC 3688”
- Source: Traktorenlexikon, “IHC 1466”