This page provides a detailed comparison of the specifications for the John Deere 8120 and the John Deere 8400.
| John Deere 8120 | John Deere 8400 | |
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| Engine | ||
| Engine Manufacturer | John Deere | John Deere |
| Engine Model | - | John Deere |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Turbocharged | Turbocharged aftercooled |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 496 ci (8.1 L) | 496 ci (8.1 L) |
| Engine Rated Rpm | 2200 | 2200 |
| Engine Power Output Value | 200 hp (149.1 kW) | 225 hp (167.8 kW) |
| Transmission | ||
| Transmission Type | Full power shift | Full power shift |
| Transmission Forward Gears | 16 | 16 |
| Transmission Reverse Gears | 4 | 4 |
| Dimensions | ||
| Length Value | 209.9 | 206.3 |
| Operating Weight Value | 19105 lb (8666 kg) | 19191 lb (8705 kg) |
| Miscellaneous | ||
| Chassis | - | 4x4 MFWD 4WD |
| Drive Type | 4x2 (2WD) | MFWD 4WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | III/IIIN | 3/3N |
| Hitch Category | IIIN | Category 3 |
| Hitch Position | Rear | - |
| Hitch Capacity Value | 12353 lb (5603 kg) | 11710 lb (5312 kg) |
| Hydraulic System Type | Closed center pressure-flow compensated (PFC) | Closed center pressure-flow compensated (PFC) |
| Operator Station Type | Cab (standard) | CommandView Cab |
| Starter Type | Electric | Electric |
