Technical specifications of the agricultural tractor John Deere 2020/2120/3020/3120:
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| Model | John Deere 2020 | John Deere 2120 | John Deere 3020 | John Deere 3120 |
| Years of production | 67-72 | 69-72 | 64-72 | 69-72 |
| Engine model / type | 4202 | 4219 | 6303 | – |
| Number of cylinders / turbocharging | 4 | 4 | 4 | 6 |
| Engine displacement (cm3) | 3320 | 3590 | 4425 | 4976 |
| Piston dimension / stroke (mm) | 98×110 | 102×110 | 108×120 | 98×110 |
| Maximum engine power (hp) / rpm | 60/2500 | 68/2500 | 75/2410 | 81/2200 |
| Torque (Nm) / rpm | 194/1500 | 228/1500 | 298/1450 | – |
| Number of gears (front + rear) | 8+4/16+8 | 8+4/16+8 | 8+2 | 12+6 |
| Number of synchronized gears (front+rear) | 8+2 | 12+6 | – | – |
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| Speed-Shift | – | – | – | – |
| Type of reverse | – | – | – | – |
| Driving speed (km/h) | 1,8-27,4 | 1,7-26,5 | 1,8-28,0 | 1,9-24,9 |
| Max Driving speed (km/h) | 30 | 30 | 32,2 | 25 |
| Hydraulic pump capacity (L/min) | 47 | 47 | 76 | 76 |
| 3-Point Hitch control | mech | mech | mech | mech |
| 3-point hitch max load (kg) | 2040 | 2040 | 1800 | – |
| PTO speed (rpm) | 540 | 540 | 540/1000 | 540 |
| Disc brake type (dry / wet) | – | – | – | – |
| Type of control of the braking system | mech | mech | hydr | hydr |
| Turning radius 2WD (m) | 6,8 | 7,42 | 5,6 | – |
| Turning radius 4WD (m) | – | – | – | – |
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| Front wheel 2WD | 7,50-16 | 7,50-16 | 7,50-16 | 7,50-18 |
| Front wheel 4WD | – | – | – | – |
| Rear wheel 2WD | 13,6-36 | 15,5-38 | 18,4-30 | 15,5-38 |
| Rear wheel 4WD | – | – | – | – |
| 2WD total weight (kg) | 2900 | 3000 | 3515 | 3900 |
| 4WD total weight (kg) | – | – | – | – |
| Total height with cabin (cm) | 245 | 245 | 238 | – |
| Total length (cm) | 357 | 360/343 | 352 | 406 |
| Total width (cm) | 218 | 218/205 | 229 | 246 |
| Fuel tank capacity (l) | 74 | 74 | 110 | 106 |
| Cabin sound level (dB) | 87,5 | 85 | 84 | 84 |
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