Technical specifications of the agricultural tractor Renault 551/651/681/751/781/851:
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| Model | Renault 551 | Renault 651 | Renault 681 | Renault 751 | Renault 781 | Renault 851 |
| Years of production | 72-80 | 72-80 | 79-80 | 73-80 | 77-80 | 74-80 |
| Engine model / type | MWM D226-3 | MWM D227-4 | MWM D227-4 | MWM D226-4 | MWM D226-4 | MWM TD226-4 |
| Number of cylinders / turbocharging | 3 | 4 | 4 | 4 | 4 | 4T |
| Engine displacement (cm3) | 3117 | 3770 | 3770 | 4154 | 4154 | 4154 |
| Piston dimension / stroke (mm) | 105×120 | 100×120 | 100×120 | 105×120 | 105×120 | 105×120 |
| Maximum engine power (hp) / rpm | 55/2350 | 65/2350 | 68/2350 | 75/2350 | 78/2350 | 85/2350 |
| Torque (Nm) / rpm | 187/1500 | 206/1600 | 230/1500 | 255/1500 | 274/1350 | 290/1400 |
| Number of gears (front + rear) | 12+3 | 12+3 | 12+12 | 12+12 | 12+12 | 12+12 |
| Number of synchronized gears (front+rear) | 12+3 | 12+3 | 12+12 | 12+12 | 12+12 | 12+12 |
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| Speed-Shift | – | – | – | – | – | – |
| Type of reverse | mech | mech | mech | mech | mech | mech |
| Driving speed (km/h) | 0,6-21,9 | 0,6-22,8 | 0,8-24,8 | 0,8-22,9 | 0,9-24,2 | 0,8-22,6 |
| Max Driving speed (km/h) | 25/30 | – | – | – | – | – |
| Hydraulic pump capacity (L/min) | 26 | 26/32 | 30,3 | 31,3 | 31,3 | 31,3 |
| 3-Point Hitch control | mech | mech | mech | mech | mech | mech |
| 3-point hitch max load (kg) | 2000 | 2000 | 3850 | 2750/3850 | 3850 | 2750 |
| PTO speed (rpm) | 540/750 | 540/750 | 540/1000 | 540/1000 | 540/1000 | 540/1000 |
| Disc brake type (dry / wet) | – | – | – | – | – | – |
| Type of control of the braking system | hydr | hydr | hydr | hydr | hydr | hydr |
| Turning radius 2WD (m) | 6,7 | 6,8 | 9,8 | – | – | – |
| Turning radius 4WD (m) | 11,4 | 10,1 | – | – | – | – |
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| Front wheel 2WD | 6,50-16 | 7,50-16 | 7,50-18 | 7,50-18 | 7,50-18 | 7,50-18 |
| Front wheel 4WD | 11,2-24 | 11,2-24 | 12,4-24 | 12,4-24 | 12,4-24 | – |
| Rear wheel 2WD | 14,9-28 | 16,9-28 | 16,9-30 | 16,9-34 | 16,9-34 | 16,9-34 |
| Rear wheel 4WD | 14,9-28 | 16,9-28 | 16,9-30 | 16,9-34 | 16,9-34 | 16,9-34 |
| 2WD total weight (kg) | 2630 | 2745 | 3275 | 2995 | 3500 | 3015 |
| 4WD total weight (kg) | 2945 | 3310 | 3385 | 3415 | 3900 | 3435 |
| Total height with cabin (cm) | 235 | 235 | 251 | 270 | 270 | – |
| Total length (cm) | 355 | 365/381 | 382/404 | 399/413 | 399/413 | – |
| Total width (cm) | 211 | 224/223 | 237/241 | 243 | 243 | – |
| Fuel tank capacity (l) | 48/65 | 65 | 82 | 77 | 77 | 77 |
| Cabin sound level (dB) | 86,5 | 89,5 | 89 | 85,5 | – | – |
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