10 material differences · fewer than 12
Tractor oneJohn Deere 40201965–1972No measured PTO figureTractor twoSteyr 8120 (a)1978–1984No measured PTO figure
Which should you choose?
Read our verdict on the 4020 and the 8120 (a) → 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 · 5 fields identical or within 5%, which is not counted as material
| Field | 4020 | 8120 (a) | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 98.7 hp | 98.7 hp | — |
| Engine declared | — | Steyr WD-611.85 | — |
| Displacement declared | — | 5.18 L | — |
| Maximum torque declared | 260 lb·ft · 353 N·m | 267 lb·ft · 362 N·m | — |
| Transmission | |||
| Top speed declared | 12.4–18.6 mph · 20–30 km/h | 15.5–18.6 mph · 25–30 km/h | differs |
| Clutch declared | Pedal operated dry single plate clutch | Dry Fichtel & Sachs single-disc clutch | differs |
| Hydraulics & hitch | |||
| Hydraulic centre declared | Closed centre | — | — |
| Pump flow declared | 18.0 gpm · 68.0 L/min | 9.4 gpm · 35.5 L/min | +92% 4020 |
| Pressure declared | 2,248 psi · 155 bar | 3,553 psi · 245 bar | +58% 8120 (a) |
| Three-point lift, at the drawbar rail declared | 5,952 lb · 2,700 kg | 8,957 lb · 4,063 kg | +50% 8120 (a) |
| Rear PTO speeds declared | 540/1000 rpm | 540/1000 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 8,444 lb · 3,830 kg | 8,477 lb · 3,845 kg | — |
| Maximum permissible mass declared | 13,228 lb · 6,000 kg | — | — |
| Wheelbase declared | 89.0 in · 2,260 mm | 98.8 in · 2,509 mm | +11% 8120 (a) |
| Length declared | 150.2 in · 3,815 mm | 163.0 in · 4,140 mm | +9% 8120 (a) |
| Width declared | 89.6 in · 2,276 mm | 84.3–104.5 in · 2,140–2,654 mm | differs |
| Ground clearance declared | 23.2 in · 590 mm | 17.3 in · 440 mm | +34% 4020 |
| Turning radius, braked declared | 10.8 ft · 3.30 m | 13.8 ft · 4.20 m | +27% 8120 (a) |
| Fuel tank declared | 135.3 qt · 128.0 L | 128.9 qt · 122.0 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.
John Deere 4020 sources
- Source: Traktorenlexikon, “John Deere 4020”
Steyr 8120 (a) sources
- Source: Traktorenlexikon, “Steyr 8120”