This page provides a detailed comparison of the specifications for the John Deere 3520 and the John Deere 3720.
| John Deere 3520 | John Deere 3720 | |
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| Engine | ||
| Engine Manufacturer | Yanmar | Yanmar |
| Engine Model | Yanmar 3TNV84T | 3TNV84HT |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Turbocharged | Turbocharged |
| Engine Cylinders | 3 | 3 |
| Engine Displacement Value | 91 ci (1.5 L) | 92 ci (1.5 L) |
| Engine Rated Rpm | 2600 | 2600 |
| Engine Power Output Value | 37 hp (27.6 kW) | 44 hp (32.8 kW) |
| Transmission | ||
| Transmission Type | Partially synchronized with power shuttle | Hydrostatic |
| Transmission Forward Gears | 12 | Infinite (3-range) |
| Transmission Reverse Gears | - | Infinite (3-range) |
| Dimensions | ||
| Length Value | 120.1 | 120.1 |
| Width Value | 52.4 | 52.4 |
| Operating Weight Value | 2900 lb (1315 kg) | 2900 lb (1315 kg) |
| Miscellaneous | ||
| Chassis | 4x4 MFWD 4WD | - |
| Drive Type | 4WD | 4WD |
| Hitch Type | Three-Point Hitch | Three-Point Hitch |
| Hitch Category | I | I |
| Hitch Position | Rear | Rear |
| Hitch Capacity Value | 2536 lb (1150 kg) | 2540 lb (1152 kg) |
| Hydraulic System Type | Open Center | Open center |
| Operator Station Type | Two-post foldable ROPS | Two-post foldable ROPS |
| Starter Type | Electric | Electric |
