This page provides a detailed comparison of the specifications for the John Deere 4640 and the John Deere 6155M.
| John Deere 4640 | John Deere 6155M | |
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| Engine | ||
| Engine Manufacturer | John Deere | John Deere |
| Engine Model | John Deere | PowerTech PVS |
| Engine Cooling Type | Liquid-cooled | Liquid with thermostat and variable speed fan, air-to-air intercooler |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Turbocharged intercooled | Turbocharged aftercooled |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 466 ci (7.6 L) | 414 ci (6.8 L) |
| Engine Rated Rpm | 2200 | 2100 |
| Engine Power Output Value | 155 hp (115.6 kW) | 155 hp (115.6 kW) |
| Transmission | ||
| Transmission Type | Partial power shift | PowrQuad Plus |
| Transmission Forward Gears | 16 | - |
| Transmission Reverse Gears | 6 | - |
| Dimensions | ||
| Length Value | 171 | 186.1 |
| Width Value | 96 | 100.4 |
| Operating Weight Value | 15700 lb (7121 kg) | 15940 lb (7230 kg) |
| Miscellaneous | ||
| Chassis | 4x2 2WD | 4x2 2WD |
| Drive Type | 2WD | - |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | - |
| Hitch Category | III/IIIN | Category 3 |
| Hitch Position | Rear | - |
| Hitch Capacity Value | 7320 lb (3320 kg) | 24250 lb (11000 kg) |
| Hydraulic System Type | Closed center | Closed-center pressure-and-flow compensated |
| Operator Station Type | Sound-Gard cab | Cab |
| Starter Type | Electric | Electric |
