David Brown 770 Selectamatic

The David Brown 770 Selectamatic is a tractor produced by David Brown. It is equipped with a 146.1 ci 2.4 L engine. The listed engine power is Diesel (listed): 36 hp / 26.8 kW. Transmission: 12 forward and 4 reverse. Operating weight: 3110 to 3270 pounds.

Engine Power

Diesel (listed): 36 hp / 26.8 kW

Fuel & Capacities

11.4 gal 43.1 L

Transmission

12 forward and 4 reverse

Operating Weight

3110 to 3270 pounds

Overview

	1965 - 1970 Selectamatic SeriesUtility tractor Selectamatic Series Utility tractor

Production
Manufacturer	David Brown
Utility tractor
Built in Meltham Mills, Huddersfield, England
Original price was $3,600 in 1970

David Brown 770 Engine
David Brown 2.4L 3-cyl diesel
Fuel tank	11.4 gal 43.1 L
Engine details ...

David Brown 770 Transmission
12-speed gear
Transmission details ...

David Brown 770 Power
Engine	36 hp 26.8 kW
PTO (claimed)	32 hp 23.9 kW
Plows	2

Mechanical
Two-wheel drive
Final drives	spur gear
Differential lock	mechanical rear
Manual steering
Mechanical drum brakes
Open operator station.

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

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

Power Take-off (PTO)
Rear PTO	live
Rear PTO Type	540 (1.375)
Engine RPM	540@1620

Dimensions & Tires
Wheelbase	75 inches 190 cm
Weight	3110 to 3270 pounds
Front tire	6.00-16
Rear tire	12.4/11-28
Full dimensions and tires ...

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

Electrical
Ground	negative
Battery volts	12
Battery AH	96

References

Selectamatic published in 1965, by David Brown

Engine

Engine Detail — 146.1 ci / 2.4 L Diesel

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

Transmission

Transmission — 12 forward and 4 reverse gear

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

Dimensions

David Brown 770 Tires
Ag front	6.00-16
Ag rear	12.4/11-28
Ag front	5.50-16
Ag rear	11.2/10-28

Dimensions
Wheelbase	75 inches 190 cm
Length	112.5 inches 285 cm
Width	64 inches 162 cm
Height (steering wheel)	55.5 inches 140 cm
Height (exhaust)	80.5 inches 204 cm
Clearance (drawbar)	11 inches 27 cm
Front tread	48/52/56/60/64/68/72/76 inches 121/132/142/152/162/172/182/193 cm
Rear tread	48/52/56/60/64/68/72/76 inches 121/132/142/152/162/172/182/193 cm

David Brown 770 Weight
Shipping	3110 lbs 1410 kg
Operating	3270 lbs 1483 kg
Max capacity	4470 lbs 2027 kg

Photos

1965 red David Brown 770 Selectamatic.

Recommended Implements & Sizing Guide

Engineering recommendations for David Brown 770 Selectamatic based on its 36 HP power envelope and ASAE agricultural standards.

Implement & Operation	Recommended Size	Workload Rating	Engineering Notes
Moldboard PlowPrimary Tillage	2 to 3 Bottom (14-16")2 - 3 铧 (35-40 cm)	Medium Duty	Standard utility farm tillage.
Rotary Cutter / MowerMowing & Clearing	5 ft (60 in)1.5 m	Medium Duty	Pasture maintenance and weeds up to 1.5" diameter.
Rotary TillerSeedbed Prep	54 to 60 in135 - 150 cm	Medium Duty	Thorough seedbed preparation in orchards and vegetable plots.
Disc HarrowSecondary Tillage	5 to 6 ft (16-18" discs)1.5 - 1.8 m (40-45 cm 耙片)	Light Duty	Small acreage soil break-up and secondary aeration.
Hay BalerHay & Forage	Small Square Baler (14x18")小方捆打捆机 (36x46 cm)	Medium Duty	Classic 2-string baler for horse and small livestock hay.

Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.

Fluids, Capacities & Working Autonomy

Standard fluid requirements, service intervals, and continuous runtime estimates for David Brown 770 Selectamatic.

Estimated Continuous Field Runtime: 6.1 hrs

Approximately 6.1 hours of continuous field operation at ~75% rated power on a full tank (11.4 gal / 43.2 L).

Estimated 75% Load Fuel Burn~1.9 gal/hr (7.1 L/hr)

Engine Crankcase Oil

SAE 15W-40 (Heavy Duty Diesel)

Standard Spec: API CK-4 / CJ-4 Heavy Duty

Service Interval: 150 – 250 Hours

Transmission & Hydraulic System

UTTO (Universal Tractor Transmission Oil)

Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)

Service Interval: 600 – 1000 Hours

Engine Cooling System

50/50 Ethylene Glycol Pre-mix

Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze

Service Interval: 2 Years / 1500 Hours