Technical specifications of the agricultural tractor John Deere 7720/7820/7920:
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| Model | John Deere 7720 | John Deere 7820 | John Deere 7920 |
| Years of production | – | – | – |
| Engine model / type | 6068T 4V-CR | 6068T 4V-CR | 6081T |
| Number of cylinders / turbocharging | 6TI | 6TI | 6TI |
| Engine displacement (cm3) | 6786 | 6786 | 8134 |
| Piston dimension / stroke (mm) | 106,5×127 | 106,5×127 | 115,9×128,5 |
| Maximum engine power (hp) / rpm | 197/1700 | 214/1700 | 234/1700 |
| Torque (Nm) / rpm | 824/1400 | 897/1400 | 969/1400 |
| Number of gears (front + rear) | 20+20 | 20+20 | – |
| Number of synchronized gears (front+rear) | 20+20 | 20+20 | – |
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| Speed-Shift | 4 | 4 | – |
| Type of reverse | hydr | hydr | hydr |
| Driving speed (km/h) | 2,4-40,0/0,05-40,0 | 2,4-40,0/0,05-40,0 | 0,05-40,0 |
| Max Driving speed (km/h) | 42/50 | 42/50 | 42/50 |
| Hydraulic pump capacity (L/min) | 120 | 120 | 120 |
| 3-Point Hitch control | ehr | ehr | ehr |
| 3-point hitch max load (kg) | 9177 | 9177 | 9177 |
| PTO speed (rpm) | 540/1000 | 540/1000 | 1000 |
| Disc brake type (dry / wet) | – | – | – |
| Type of control of the braking system | hydr | hydr | hydr |
| Turning radius 2WD (m) | – | – | – |
| Turning radius 4WD (m) | 10,57 | 10,57 | 10,57 |
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| Front wheel 2WD | – | – | – |
| Front wheel 4WD | 600/65R28 | 600/65R28 | 600/70R30 |
| Rear wheel 2WD | – | – | – |
| Rear wheel 4WD | 620/70R42 | 620/70R42 | 710/70R42 |
| 2WD total weight (kg) | – | – | – |
| 4WD total weight (kg) | 7772 | 7772 | 7939 |
| Total height with cabin (cm) | 321 | 321 | 326 |
| Total length (cm) | 545 | 545 | 550 |
| Total width (cm) | 286 | 286 | 286 |
| Fuel tank capacity (l) | 392 | 392 | 392 |
| Cabin sound level (dB) | 72 | 72 | 72 |
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