This page provides a detailed comparison of the specifications for the Challenger MT645C and the John Deere 6125M.
| Challenger MT645C | John Deere 6125M | |
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| Engine | ||
| Engine Manufacturer | AGCO | John Deere |
| Engine Model | Sisu Diesel (Serial No. T00767) | PowerTech PVX |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Turbocharged intercooled | Variable geometry turbocharger with intercooler |
| Engine Cylinders | 6 | 4 |
| Engine Displacement Value | 513 ci (8.4 L) | 276 ci (4.5 L) |
| Engine Rated Rpm | 2200 | 2100 |
| Engine Power Output Value | 242 hp (180.7 kW) | 115 hp (85.7 kW) |
| Transmission | ||
| Transmission Type | Continuously variable transmission | Fully synchronized |
| Transmission Forward Gears | Infinite | 12 |
| Transmission Reverse Gears | Infinite | 4 |
| Dimensions | ||
| Length Value | 223.2 | - |
| Operating Weight Value | 25795 lb (11700 kg) | 10930 lb (4958 kg) |
| Miscellaneous | ||
| Chassis | - | 4x4 MFWD 4WD |
| Drive Type | - | 4WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | Three-Point Hitch |
| Hitch Category | III | II/IIIN |
| Hitch Position | Rear | Rear |
| Hitch Capacity Value | 26460 lb (12002 kg) | 5153 lb (2337 kg) |
| Hydraulic System Type | Closed center load sensing | Open center pressure compensated |
| Operator Station Type | - | Two-post foldable ROPS or Cab (optional) |
| Starter Type | Electric | Electric |
