This page provides a detailed comparison of the specifications for the John Deere 6125M and the John Deere 6420.
| John Deere 6125M | John Deere 6420 | |
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| Engine | ||
| Engine Manufacturer | John Deere | John Deere |
| Engine Model | PowerTech PVX | PowerTech 4045HL070 |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Variable geometry turbocharger with intercooler | Turbocharged |
| Engine Cylinders | 4 | 4 |
| Engine Displacement Value | 276 ci (4.5 L) | 276 ci (4.5 L) |
| Engine Rated Rpm | 2100 | 2300 |
| Engine Power Output Value | 115 hp (85.7 kW) | 110 hp (82.0 kW) |
| Transmission | ||
| Transmission Type | Fully synchronized | Fully synchronized |
| Transmission Forward Gears | 12 | 12 |
| Transmission Reverse Gears | 4 | 4 |
| Dimensions | ||
| Length Value | - | 162.7 |
| Width Value | - | 61.8 |
| Operating Weight Value | 10930 lb (4958 kg) | 10472 lb (4750 kg) |
| Miscellaneous | ||
| Chassis | 4x4 MFWD 4WD | 4x4 MFWD 4WD |
| Drive Type | 4WD | 4WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | - |
| Hitch Category | II/IIIN | II |
| Hitch Position | Rear | - |
| Hitch Capacity Value | 5153 lb (2337 kg) | 4741 lb (2150 kg) |
| Hydraulic System Type | Open center pressure compensated | Closed center pressure flow compensated |
| Operator Station Type | Two-post foldable ROPS or Cab (optional) | Open |
| Starter Type | Electric | Electric |
