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David Brown 770 Selectamatic

David Brown 770 Selectamatic tractor
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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.
David Brown 770SelectamatictractorspecificationsenginetransmissiondimensionshydraulicsPTOfarm tractor
Power-
Founded-
Model770 Selectamatic

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)

Power Take-off (PTO)

Rear PTO:live
Engine RPM:540@1620
Rear PTO Type:540 (1.375)

Related Models

David Brown 880

Model:880