This page provides a detailed comparison of the specifications for the John Deere 3120 and the RK Tractors RK37H.
| John Deere 3120 | RK Tractors RK37H | |
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| Engine | ||
| Engine Manufacturer | Yanmar | Yanmar |
| Engine Model | 3TNV84 | 3TNV88-CR |
| Engine Cooling Type | Liquid-cooled | Liquid-cooled |
| Engine Fuel Type | Diesel | Diesel |
| Engine Induction Type | Natural | Common rail direct injection |
| Engine Cylinders | 3 | 3 |
| Engine Displacement Value | 92 ci (1.5 L) | 100 ci (1.6 L) |
| Engine Rated Rpm | 2600 | 3000 |
| Engine Power Output Value | 30 hp (22.0 kW) | 37 hp (27.9 kW) |
| Transmission | ||
| Transmission Type | Hydrostatic | Hydrostatic |
| Transmission Forward Gears | Infinite (3-range) | Infinite (3-range) |
| Transmission Reverse Gears | Infinite (3-range) | Infinite (3-range) |
| Dimensions | ||
| Length Value | 120.1 | 126 |
| Width Value | 52.4 | 53.5 |
| Operating Weight Value | 2998 lb (1360 kg) | 3106 lb (1409 kg) |
| Miscellaneous | ||
| Chassis | 4x4 MFWD 4WD | 4x4 MFWD 4WD |
| Drive Type | 4WD | 4WD |
| Front Tire Type | - | - |
| Rear Tire Type | - | - |
| Hitch Type | - | Category 3 |
| Hitch Category | I | I |
| Hitch Position | - | Rear |
| Hydraulic System Type | Open center | - |
| Operator Station Type | Open operator station with two-post ROPS | Open with ROPS |
| Starter Type | Electric | Electric |
