This page provides a detailed comparison of the specifications for the John Deere 8420 and the John Deere 8R 250.
| John Deere 8420 | John Deere 8R 250 | |
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| Engine | ||
| Engine Manufacturer | John Deere | John Deere |
| Engine Model | - | RG6090U094226 |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Turbocharged | Turbocharged |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 496 ci (8.1 L) | 548 ci (9.0 L) |
| Engine Rated Rpm | 2200 | - |
| Engine Power Output Value | 270 hp (201.3 kW) | 225 hp (168.1 kW) |
| Transmission | ||
| Transmission Type | Full power shift | Full Power Shift, e23 Transmission |
| Transmission Forward Gears | 16 | 23 |
| Transmission Reverse Gears | 4 | 11 |
| Dimensions | ||
| Length Value | 211.9 | 252.8 |
| Operating Weight Value | 23955 lb (10866 kg) | 27405 lb (12431 kg) |
| Miscellaneous | ||
| Chassis | 4x4 MFWD 4WD | 4x4 MFWD 4WD |
| Drive Type | 4WD | 4WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | III/IIIN | Three-Point Hitch Category III/IIIN |
| Hitch Category | Category 3 | Category 3 |
| Hitch Position | Rear | Rear |
| Hitch Capacity Value | 17897 lb (8118 kg) | 20254 lb (9187 kg) |
| Hydraulic System Type | Closed center pressure-flow compensated (PFC) | Closed-Center Pressure Flow Compensated |
| Operator Station Type | Cab (standard) | Cab |
| Starter Type | Electric | Electric |
