David Brown 770 utility tractor: review and specs

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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