The David Brown 770 Selectamatic is a 2WD utility tractor from the Selectamatic series. This tractor was manufactured by David Brown in Meltham Mills, Huddersfield, England from 1965 to 1970. The David Brown 770 is equipped with a 2.4 L (146.1 cu·in) three-cylinder diesel engine and a gear type transmission with 12 forward and 4 reverse gears and dry disc clutch.
The David Brown 770 Selectamatic utility tractor used the David Brown AD3/49 engine. It is a 2.4 L, 2,394 cm2, (146.1 cu·in) three-cylinder natural aspirated diesel engine with 100.0 mm (3.94 in) of the cylinder bore and 102.0 mm (4.02 in) of the piston stroke. The compression ratio rating is 17.0:1. This engine produced 36.4 PS (26.8 kW; 36.0 HP) at 2,055 rpm of output power.
The David Brown 770 Selectamatic is equipped with manual steering, mechanical drum brakes, open operator station and 43.0 liters (11.4 US gal.; 9.5 Imp. gal) fuel tank.
David Brown 770 Selectamatic Specifications
| General Specifications | |
| Model | David Brown 770 Selectamatic |
| Length | 2,850 mm (112.2 in) |
| Width | 1,620 mm (63.8 in) |
| Height | 2,040 mm (80.3 in) |
| Wheel base | 1,900 mm (74.8 in) |
| Weight | 1,485 kg (3,274 lbs) |
| Fuel tank capacity | 43.0 liters (11.4 US gal.; 9.5 Imp. gal) |
| Battery | 12V, 96Ah |
| Cabin type | Open operator station |
| Engine | |
| Engine model | David Brown AD3/49 |
| Engine type | Four-stroke, liquid-cooled, inline |
| Cylinders | 3 |
| Fuel type | Diesel |
| Displacement | 2.4 L, 2,394 cm2, (146.1 cu·in) |
| Bore and stroke | 100.0 mm X 102.0 mm (3.94 in X 4.02 in) |
| Compression ratio | 17.0:1 |
| Horsepower | 36.4 PS (26.8 kW; 36.0 HP) at 2,055 rpm |
| Torque | 135.6 N·m (13.8 kg·m, 99.9 ft·lb) at 1,400 rpm |
| Starter | Electric |
| Oil capacity: | 7.4 L (7.8 US. qt, 6.5 Imp. qt.) |
| Coolant capacity: | 11.4 L (12 US. qt, 10 Imp. qt.) |
| Transmission and chassis | |
| Chassis | 4×2 2WD |
| Steering type | Manual |
| Brakes | Mechanical drum |
| Final drive | Spur gear |
| Differential lock | Mechanical rear |
| Transmission type | Gear type with dry disc clutch |
| Gears | 12 forward and 4 reverse |
| Speed | Forward: 23.8 kmh (14.8 mph) Reverse: 12.9 (8 mph) |
| Transmission oil capacity | 27.3 L (7.2 US. gal, 6 Imp. gal.) |
| Tires | |
| Front tires | Ag: 6.00-16, 5.50-16 |
| Rear tires | Ag: 12.4/11-28, 11.2/10-28 |
| Three-Point Hitch | |
| Caterogy | I |
| Control type | Position and draft control |
| Lift capacity (at ends) | – |
| PTO (Power take-off shaft) | |
| Rear PTO type | Live |
| Rear PTO speed | 540 rpm |
| Hydraulic system | |
| Hydraulic type | Open center |
| Pressure | 2000 psi (137.9 bar) |
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