This page provides a detailed comparison of the specifications for the John Deere 6120E and the John Deere 7820.
| John Deere 6120E | John Deere 7820 | |
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| Engine | ||
| Engine Manufacturer | John Deere | John Deere |
| Engine Model | PowerTech PWL | - |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Wastegate turbocharger with air-to-air aftercooling | Turbocharged |
| Engine Cylinders | 4 | 6 |
| Engine Displacement Value | 276 ci (4.5 L) | 6.8 L (415 ci) |
| Engine Rated Rpm | 2200 | 2100 |
| Engine Power Output Value | 120 hp (89.5 kW) | 171 hp (127.6 kW) |
| Transmission | ||
| Transmission Type | Selective gear fixed ratio | Partial power shift (AutoQuad-Plus) |
| Transmission Forward Gears | 24 | 20 |
| Transmission Reverse Gears | 12 | 20 |
| Dimensions | ||
| Length Value | - | 212.2 |
| Width Value | - | 96 |
| Operating Weight Value | 14250 lb (6464 kg) | 21000 lb (9525 kg) |
| Miscellaneous | ||
| Chassis | 4x4 MFWD 4WD | 4x4 MFWD 4WD |
| Drive Type | 4WD | 4WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | Three-Point Hitch |
| Hitch Category | II | Category 3 |
| Hitch Position | Rear | Rear |
| Hitch Capacity Value | 7300 lb (3311 kg) | 13618 lb (6177 kg) |
| Hydraulic System Type | Open center | Closed-center pressure-flow compensated (PFC) |
| Operator Station Type | Two-post foldable ROPS or Cab (optional) | Cab |
| Starter Type | Electric | Electric |
