10 material differences · fewer than 12
Tractor oneInternational Harvester 12561967–1969No measured PTO figureTractor twoInternational Harvester 36881981–1985No measured PTO figure
Which should you choose?
Read our verdict on the 1256 and the 3688 → It is generated from the rows below by a fixed, versioned rule set, and names the figure behind every call.
Field by field
10 material differences · 1 fields identical or within 5%, which is not counted as material
| Field | 1256 | 3688 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 116.4 hp | 113.5 hp | — |
| Engine declared | INTERNATIONAL HARVESTER DT-407 | INTERNATIONAL HARVESTER DT-436 | differs |
| Displacement declared | 6.67 L | 7.14 L | +7% 3688 |
| Transmission | |||
| Top speed declared | 18.6 mph · 30 km/h | 19.9 mph · 32 km/h | +7% 3688 |
| Hydraulics & hitch | |||
| Pump flow declared | — | 18.0 gpm · 68.1 L/min | — |
| Rear PTO speeds declared | 1000 rpm | 540/1000 rpm | differs |
| Weight & dimensions | |||
| Unladen weight declared | 10,406 lb · 4,720 kg | 13,201 lb · 5,988 kg | +27% 3688 |
| Wheelbase declared | 92.0 in · 2,337 mm | 104.8 in · 2,662 mm | +14% 3688 |
| Length declared | 164.0 in · 4,166 mm | 184.0 in · 4,674 mm | +12% 3688 |
| Width declared | 92.0 in · 2,337 mm | 102.0 in · 2,591 mm | +11% 3688 |
| Ground clearance declared | 23.5 in · 597 mm | 13.0 in · 330 mm | +81% 1256 |
| Turning radius, braked declared | — | 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 1256 sources
Source
- Source: Traktorenlexikon, “IHC 1256”
- Source: Traktorenlexikon, “IHC 1026”
International Harvester 3688 sources
Source
- Source: Traktorenlexikon, “IHC 3688”
- Source: Traktorenlexikon, “IHC 1466”