This page provides a detailed comparison of the specifications for the John Deere 3155 and the John Deere 6615.
| John Deere 3155 | John Deere 6615 | |
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| Engine | ||
| Engine Manufacturer | John Deere | John Deere |
| Engine Model | - | 6068T |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Naturally aspirated | Turbocharged |
| Engine Cylinders | 6 | 6 |
| Engine Displacement Value | 359 ci (5.9 L) | 414 ci (6.8 L) |
| Engine Rated Rpm | 2400 | 2300 |
| Engine Power Output Value | 95 hp (70.8 kW) | 105 hp (78.5 kW) |
| Transmission | ||
| Transmission Type | Partially synchronized / Partial power shift | Fully synchronized, Power shuttle, Four-speed power shift |
| Transmission Forward Gears | 16 | 16 |
| Transmission Reverse Gears | 8 | 16 |
| Dimensions | ||
| Length Value | - | 177.2 |
| Operating Weight Value | 11770 lb (5339 kg) | 10670 lb (4840 kg) |
| Miscellaneous | ||
| Chassis | 4x4 MFWD 4WD | 4x4 MFWD 4WD |
| Drive Type | MFWD | 4WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | Three-Point Hitch | - |
| Hitch Category | II | Category 2 |
| Hitch Position | Rear | Rear |
| Hitch Capacity Value | 6305 lb (2860 kg) | 6475 lb (2937 kg) |
| Hydraulic System Type | Closed center | Constant-flow load-sensing |
| Operator Station Type | Two-post ROPS or Sound-Gard Cab (optional) | Two-post foldable ROPS or ComfortVantage Cab (optional) |
| Starter Type | Electric | Electric |
