David Brown

David Brown 770 Selectamatic

The David Brown 770 Selectamatic is a utility farm tractor produced from 1965 to 1970. It features a 2.4L 3-cylinder diesel engine producing 36 hp, a 12-speed gear transmission, and two-wheel drive. Built in England, it offers mechanical rear differential lock, manual steering, and an open operator station. The tractor includes an open center hydraulic system with 2000 psi pressure and a live 540 RPM rear PTO. It has a wheelbase of 75 inches and weighs approximately 3110 to 3270 pounds. The 770 was originally priced at $3,600 in 1970 and is part of the Selectamatic series, related to the David Brown 880 model.

Power-

Founded-

Model770 Selectamatic

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Technical Specifications

Detailed specifications and technical data for David Brown 770 Selectamatic

Power

Plows	2
Engine power	36 hp (26.8 kW)
PTO (claimed)	32 hp (23.9 kW)

Engine

Type	diesel
Model	David Brown AD3/49
Power	36 hp (26.8 kW)
Torque	100 lb-ft (135.6 Nm)
Cooling	liquid-cooled
Starter	electric
Idle RPM	700-2000
Cylinders	3-cylinder
Fuel tank	11.4 gal (43.1 L)
Rated RPM	2055
Torque RPM	1400
Bore/Stroke	3.94x4.00 inches (100 x 102 mm)
Fuel system	direct injection
Displacement	146.1 ci (2.4 L)
Firing order	1-2-3
Oil capacity	7.8 qts (7.4 L)
Starter volts	12
Coolant capacity	12 qts (11.4 L)
Compression ratio	17:1

Weight

Shipping	3110 lbs (1410 kg)
Operating	3270 lbs (1483 kg)
Max capacity	4470 lbs (2027 kg)

Electrical

Ground	negative
Battery AH	96
Battery volts	12

Hydraulics

Type	open center
Pressure	2000 psi (137.9 bar)
Pump flow	6.6 gpm (25.0 lpm)

Mechanical

Drive	Two-wheel drive
Brakes	Mechanical drum brakes
Steering	Manual
Final drives	spur gear
Operator station	Open operator station
Differential lock	mechanical rear

Production

Type	Utility tractor
Series	Selectamatic Series
Built in	Meltham Mills, Huddersfield, England
Original price	$3,600 in 1970
Years produced	1965 - 1970

Belt Pulley

RPM	2023
Speed	3100 ft/min (944.88 meters/min)
Width	5.2 inches (13 cm)
Diameter	8.5 inches (21 cm)

Transmission

Type	gear
Gears	12 forward and 4 reverse
Clutch	dry disc
Oil capacity	28.8 qts (27.3 L)

Tractor hitch

Control	position and draft control
Rear Type	I
Rear lift (at ends)	1600 lbs (725 kg)

Dimensions & Tires

Width	64 inches (162 cm)
Length	112.5 inches (285 cm)
Rear tire	12.4/11-28
Wheelbase	75 inches (190 cm)
Front tire	6.00-16
Rear tread	48/52/56/60/64/68/72/76 inches (121/132/142/152/162/172/182/193 cm)
Front tread	48/52/56/60/64/68/72/76 inches (121/132/142/152/162/172/182/193 cm)
Height (exhaust)	80.5 inches (204 cm)
Alternate rear tire	11.2/10-28
Clearance (drawbar)	11 inches (27 cm)
Alternate front tire	5.50-16
Height (steering wheel)	55.5 inches (140 cm)