This page provides a detailed comparison of the specifications for the John Deere 8520T and the John Deere 9520.
| John Deere 8520T | John Deere 9520 | |
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| Engine | ||
| Engine Manufacturer | John Deere | John Deere |
| 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) | 765 ci (12.5 L) |
| Engine Rated Rpm | 2179 | 2100 |
| Engine Power Output Value | 256 hp (190.9 kW) | 450 hp (335.6 kW) |
| Transmission | ||
| Transmission Type | Full power shift | Full power shift |
| Transmission Forward Gears | 16 | 18 |
| Transmission Reverse Gears | 4 | 6 |
| Dimensions | ||
| Length Value | 207 | 273.6 |
| Width Value | 119.5 | 115.4 |
| Operating Weight Value | 27280 lb (12374 kg) | 38316 lb (17380 kg) |
| Miscellaneous | ||
| Chassis | Crawler | 4x4 articulated 4WD |
| Drive Type | Track | 4WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Category | III/IIIN | III/IV/IVN |
| Hitch Position | Rear | Rear |
| Hitch Capacity Value | 16520 lb (7493 kg) | 13870 lb (6291 kg) |
| Hydraulic System Type | Closed center pressure-flow compensated (PFC) | Closed center pressure/flow compensated |
| Operator Station Type | Cab | CommandView cab with air-conditioning |
| Starter Type | Electric | Electric |
