Technical Specifications of the David Brown Selectamatic 770 agricultural tractor:
David Brown 770 Selectamatic agricultural tractor was produced from 1965 to 1970. It is equipped with a DB AD3/49 engine, consisting of three cylinders, without a turbo and intercooler, with a displacement of 2400 cm³. The piston dimensions are 100 mm, and the piston stroke is 101.6 mm. The engine reaches a maximum power of 36 HP at 2000 RPM and a torque of 137 Nm at 1200 RPM. The tractor has two gearbox options: 6 forward gears and 2 reverse gears or 12 forward gears and 4 reverse gears. The speed range is from 3.2 km/h to 26.2 km/h, with a maximum speed of 27.9 km/h. The hydraulic pump has a capacity of 22.7 liters per minute. The rear hitch is mechanically controlled and has a maximum lifting capacity of 1200 kg. The power take-off (PTO) operates at a speed of 540 RPM. David Brown 770 is equipped with a mechanically controlled braking system. The turning radius is 6.7 meters for the 2WD version. The front tires are sized 6.00-16, while the rear tires are 12.4-28. The total weight is 1720 kg for the 2WD version. The tractor height with cab is 142 cm, the length is 290 cm, and the width is 196 cm. The fuel tank capacity is 36 liters.
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Technical Data Sheet for David Brown Selectamatic 880, 770, 780, 990, 1200 agricultural tractors:
| Model | David Brown Selectamatic 770 | David Brown Selectamatic 780 | David Brown Selectamatic 880 | David Brown Selectamatic 990 | David Brown Selectamatic 1200 |
|---|---|---|---|---|---|
| Years of production | 65-70 | 67-71 | 65-71 | 65-71 | 67-68 |
| Engine designation/type | DB AD3/49 | DB AD3/35 | DB AD3/55 | DB AD4/47 | DB AD4/45 |
| Number of cylinders / Turbo / Intercooler | 3 | 3 | 3 | 4 | 4 |
| Engine displacement (cm³) | 2400 | 2695 | 2695 | 3045 | 3592 |
| Piston diameter / Stroke (mm) | 100×101,6 | 100×114,3 | 100×114,3 | 92,1×114,3 | 100×114,3 |
| Maximum engine power (HP) / at RPM | 36/2000 | 46/2200 | 46/2200 | 55/2200 | 67/2300 |
| Torque (Nm) / at RPM | 137/1200 | 172/1200 | 172/1200 | 209/1200 | 247/1200 |
| Number of gearbox speeds (forward + reverse) | 6+2/12+4 | 6+2/12+4 | 6+2/12+4 | 6+2/12+4 | 6+2/12+4 |
| Number of synchronized gears (forward + reverse) | – | – | – | – | – |
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| Fast gearbox / Power shift | – | – | – | – | – |
|---|---|---|---|---|---|
| Reverser type | – | – | – | – | – |
| Speed range (km/h) | 3,2-26,2 | 4,3-29,2 | 3,3-26,0 | 4,0-23,7 | 4,0-23,7 |
| Maximum speed (km/h) | 27,9 | 27 | 27 | – | – |
| Hydraulic pump capacity (L/min) | 22,7 | 22,7 | 22,7 | 22,7 | 22,7(50) |
| Rear three-point hitch (TUV) control type | mech | mech | mech | mech | mech |
| Maximum rear three-point hitch (TUV) lift capacity (kg) | 1200 | 1200 | 1200 | 1500 | 1940/2080 |
| Power take-off (PTO) speed (RPM) | 540 | 540 | 540/1000 | 540/1000 | 540/1000 |
| Type of disc brake (dry/wet) | – | – | – | – | – |
| Brake system control type | mech | mech | mech | mech | mech |
| Turning radius 2WD (m) | 6,7 | 6,28 | 6,4 | 7 | 7 |
| Turning radius 4WD (m) | – | – | – | – | – |
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| Front tire size 2WD | 6,00-16 | 6,00-16 | 6,00-16 | 7,50-16 | 7,50-16 |
|---|---|---|---|---|---|
| Front tire size 4WD | – | – | – | – | – |
| Rear tire size 2WD | 12,4-28 | 12,4-28 | 12,4-32 | 12,4-36 | 12,4-36 |
| Rear tire size 4WD | – | – | – | – | – |
| Total weight 2WD (kg) | 1720 | 1690 | 1800 | 2200 | 2610 |
| Total weight 4WD (kg) | – | – | – | – | – |
| Total height with cabin (cm) | 142 | 150 | 163 | 164 | 164 |
| Total length (cm) | 290 | 308 | 315 | 363 | 363 |
| Total width (cm) | 196 | 190,5 | 203 | 200 | 225 |
| Fuel tank capacity (L) | 36 | 36 | 52,3 | 61,4 | 81,7 |
| Cabin noise level (dB) | – | – | – | – | – |
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