This page provides a detailed comparison of the specifications for the John Deere 8400T and the John Deere 8520T.
| John Deere 8400T | John Deere 8520T | |
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| Engine | ||
| Engine Manufacturer | John Deere | John Deere |
| Engine Model | Serial No.*RG6081 H040198* | - |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Turbocharged intercooled | Turbocharged |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 496 ci (8.1 L) | 496 ci (8.1 L) |
| Engine Rated Rpm | 2000 | 2179 |
| Engine Power Output Value | 227 hp (169.1 kW) | 256 hp (190.9 kW) |
| Transmission | ||
| Transmission Type | Full powershift | Full power shift |
| Transmission Forward Gears | 16 | 16 |
| Transmission Reverse Gears | 4 | 4 |
| Dimensions | ||
| Length Value | 207 | 207 |
| Width Value | 103.7 | 119.5 |
| Operating Weight Value | 25000 lb (11340 kg) | 27280 lb (12374 kg) |
| Miscellaneous | ||
| Chassis | Crawler | Crawler |
| Drive Type | Track | Track |
| Hitch Type | Three-Point Hitch | - |
| Hitch Category | Category 3 | III/IIIN |
| Hitch Position | Rear | Rear |
| Hitch Capacity Value | 15650 lb (7099 kg) | 16520 lb (7493 kg) |
| Hydraulic System Type | Closed center pressure-flow compensated (PFC) | Closed center pressure-flow compensated (PFC) |
| Operator Station Type | Cab | Cab |
| Starter Type | Electric | Electric |
