12 material differences
Tractor oneInternational Harvester 5231965–1972No measured PTO figureTractor twoZETOR 45111968–1972No measured PTO figure
Which should you choose?
We will not advise between these two machines, because the drive differs (Two-wheel or four-wheel drive; 2WD). 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
12 material differences · 4 fields identical or within 5%, which is not counted as material
| Field | 523 | 4511 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 47.1 hp | 47.3 hp | — |
| Engine declared | IHC D-179 | ZETOR Z-4001 | differs |
| Displacement declared | 2.93 L | 3.12 L | +6% 4511 |
| Maximum torque declared | 131 lb·ft · 177 N·m | 139 lb·ft · 188 N·m | +6% 4511 |
| Transmission | |||
| Top speed declared | 12.4–18.6 mph · 20–30 km/h | 15.5 mph · 25 km/h | differs |
| Clutch declared | Pedal-operated dry single-disc clutch | Pedal-operated dry two-stage double clutch | differs |
| Hydraulics & hitch | |||
| Pump flow declared | 7.5 gpm · 28.5 L/min | 5.3 gpm · 20.0 L/min | +43% 523 |
| Pressure declared | 3,556 psi · 245 bar | 2,134 psi · 147 bar | +67% 523 |
| Rear PTO speeds declared | 540 rpm | 540 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 5,379–6,294 lb · 2,440–2,855 kg | 4,431 lb · 2,010 kg | differs |
| Wheelbase declared | 78.7 in · 2,000 mm | 83.7 in · 2,125 mm | +6% 4511 |
| Length declared | 119.5–128.7 in · 3,035–3,268 mm | 140.0 in · 3,555 mm | differs |
| Width declared | 71.5 in · 1,815 mm | 70.5 in · 1,790 mm | — |
| Ground clearance declared | 15.0 in · 380 mm | 17.2 in · 436 mm | +15% 4511 |
| Turning radius, braked declared | 12.0 ft · 3.65 m | 10.7 ft · 3.25 m | +12% 523 |
| Fuel tank declared | 74.0 qt · 70 L | 74.0 qt · 70.0 L | — |
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 523 sources
- Source: Traktorenlexikon, “IHC 523”
- Source: Traktorenlexikon, “IHC 553”
- Source: Traktorenlexikon, “McCormick 523”
ZETOR 4511 sources
- Source: Traktorenlexikon, “Zetor 4511”