This page provides a detailed comparison of the specifications for the John Deere 7215R and the John Deere 8400T.
| John Deere 7215R | John Deere 8400T | |
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| Engine | ||
| Engine Manufacturer | John Deere | John Deere |
| Engine Model | PowerTech PSX | Serial No.*RG6081 H040198* |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Turbocharged with two turbochargers and air-to-air aftercooler | Turbocharged intercooled |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 414 ci (6.8 L) | 496 ci (8.1 L) |
| Engine Rated Rpm | 2100 | 2000 |
| Engine Power Output Value | 215 hp (160.3 kW) | 227 hp (169.1 kW) |
| Transmission | ||
| Transmission Type | Selective gear fixed ratio with partial (4) range operator-controlled power shift | Full powershift |
| Transmission Forward Gears | 20 | 16 |
| Transmission Reverse Gears | 20 | 4 |
| Dimensions | ||
| Length Value | - | 207 |
| Width Value | - | 103.7 |
| Operating Weight Value | 21565 lb (9782 kg) | 25000 lb (11340 kg) |
| Miscellaneous | ||
| Chassis | - | Crawler |
| Drive Type | - | Track |
| Hitch Type | Three-Point Hitch | Three-Point Hitch |
| Hitch Category | III | Category 3 |
| Hitch Position | Rear | Rear |
| Hitch Capacity Value | 15324 lb (6951 kg) | 15650 lb (7099 kg) |
| Hydraulic System Type | Closed-center pressure and flow compensated (PFC) | Closed center pressure-flow compensated (PFC) |
| Operator Station Type | - | Cab |
| Starter Type | 12-volt electric | Electric |
