This page provides a detailed comparison of the specifications for the John Deere 6R 230 and the John Deere 8420T.
| John Deere 6R 230 | John Deere 8420T | |
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| Engine | ||
| Engine Manufacturer | John Deere | John Deere |
| Engine Model | PowerTech PVS | - |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Turbocharged | Turbocharged |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 415 ci (6.8 L) | 496 ci (8.1 L) |
| Engine Rated Rpm | 2100 | 2200 |
| Engine Power Output Value | 227 hp (169.0 kW) | 284 hp (211.8 kW) |
| Transmission | ||
| Transmission Type | Continuously-variable transmission | Full power shift |
| Transmission Forward Gears | - | 16 |
| Transmission Reverse Gears | - | 4 |
| Dimensions | ||
| Length Value | 206.2 | 207 |
| Width Value | - | 103.7 |
| Operating Weight Value | 20503 lb (9300 kg) | 26380 lb (11966 kg) |
| Miscellaneous | ||
| Drive Type | - | Track |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | Three-Point Hitch |
| Hitch Category | III/IIIN | III/IIIN |
| Hitch Position | Rear | Rear |
| Hydraulic System Type | Closed-center PFC | Closed center pressure flow compensated (PFC) |
| Operator Station Type | Cab | Cab |
| Starter Type | Electric | Electric |
