This page provides a detailed comparison of the specifications for the Farmall 856 and the John Deere 4020.
| Farmall 856 | John Deere 4020 | |
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| Engine | ||
| Engine Manufacturer | International Harvester | John Deere |
| Engine Model | D-407 | - |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Naturally aspirated | Naturally aspirated |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 407 ci (6.7 L) | 404 ci (6.6 L) |
| Engine Rated Rpm | 2400 | 2200 |
| Engine Power Output Value | 95 hp (70.8 kW) | 101 hp (75.3 kW) |
| Transmission | ||
| Transmission Type | Sliding gear with dry disc clutch | Partially synchronized (Syncro-Range) |
| Transmission Forward Gears | 8 | 8 |
| Transmission Reverse Gears | 4 | 2 |
| Dimensions | ||
| Length Value | 163.8 | 150.8 |
| Width Value | 91.7 | 89.4 |
| Operating Weight Value | 10290 lb (4667 kg) | 8645 lb (3921 kg) |
| Miscellaneous | ||
| Chassis | - | 4x2 2WD |
| Drive Type | 2WD | 2WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | IH Fast Hitch | Three-Point Hitch |
| Hitch Category | II | II |
| Hitch Position | Rear | Rear |
| Hitch Capacity Value | - | 3790 lb (1719 kg) |
| Hydraulic System Type | - | Closed center |
| Operator Station Type | Open | Open |
| Starter Type | Electric | Electric |
