David Brown 770 Selectamatic

Last Updated: July 2024

Overview

The David Brown 770 Selectamatic is a utility tractor manufactured in England between 1965 and 1970. It is equipped with a 3-cylinder, naturally aspirated diesel engine that produces 38.34 horsepower at 2000 rated RPM. The engine has a bore of 3.94 inches, stroke of 4.0 inches, and a compression ratio of 17:1. It employs a liquid cooling system, and the tractor offers a gear type transmission with 12 forward and 4 reverse gears. Notable features include a mechanical rear differential lock, single plate dry disc clutch combined with PTO clutch, and a constant running hydraulic system. The tractor has a turning radius of 121 inches with brakes applied. It is fitted with 6.00-16 front tires and 12.4-28 rear tires. The operating weight without ballast is 3730 lbs, and with ballast, it is 5760 lbs. This model sees a range of agricultural applications and is significant for its compact design, power output, and versatility.
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Key Specifications

Category: Utility

Power Output: 38.34

Transmission: Gear

Drive Type: 2WD

Operating Weight: 3730

Fuel Type: Diesel

Image Gallery

David Brown 770 Selectamatic Tractor David Brown 770 Selectamatic Tractor David Brown 770 Selectamatic Tractor David Brown 770 Selectamatic Tractor David Brown 770 Selectamatic Tractor David Brown 770 Selectamatic Tractor

David Brown 770 Selectamatic vs. Similar Tractors

Power Output
Average
Greater than 32% of similar tractors.
Operating Weight
Below Average
Greater than 28% of similar tractors.

Technical Specifications

Engine

Manufacturer
David Brown
Model
AD3/49
Cooling Type
Liquid-Cooled
Cylinder Orientation
Inline
Valve Configuration
-
Fuel Type
Diesel
Induction Type
Naturally Aspirated
Cylinders
3
Displacement (ci)
164.1
Bore (in)
3.94
Stroke (in)
4.0
Rated RPM
2000
Power Output (hp)
38.34

Transmission

Type
Gear
Forward Gears
12
Reverse Gears
4
Total Gears
-

Dimensions

Length (in)
112.2
Width (in)
63.8
Height (in)
80.3
Operating Weight (lb)
3730

Power Take-Off (PTO)

PTO Type
Live
PTO Speed 1 (rpm)
540
PTO Speed 2 (rpm)
-
PTO Speed 3 (rpm)
-

Miscellaneous

Chassis
4x2 2WD
Drive Type
2WD
Steering Type
Manual
Coolant Capacity (qts)
12
Front Tire Diameter (in)
-
Front Tire Width (in)
-
Rear Tire Diameter (in)
-
Rear Tire Width (in)
-
Front/Rear Rim Diameter (in)
-
Tire Type
Ag
Manufacture - End Year
1970
Hitch Type
Category I
Hitch Category
I
Hitch Position
-
Hitch Capacity (lb)
-
Operator Station Type
Open Operator Station
Starter Type
Electric
Brake Type
Internal expanding shoe
Hydraulic System Type
Open Center

Test Results

Nebraska Tractor Test Laboratory - Test Date: September 13 to September 26, 1966

Maximum Power and Fuel Consumption

  • Maximum Power (at Rated Engine Speed, 2000 rpm): 38.34 HP
  • Fuel Consumption at Maximum Power: 2.796 Gal/hr with a fuel efficiency of 0.444 lb/hp.hr
  • Crankshaft Speed at Maximum Power: 2000 rpm

Drawbar Performance

  • Maximum Power at Rated Engine Speed, 8th Gear: 28.98 HP with a drawbar pull of 2170 lbs
  • Fuel Consumption at Rated Speed: 0.428 lb/hp.hr with a fuel efficiency of 16.74 Hp.hr/gal
  • Maximum Available Power, Two Hours, 8th Gear: 4.89 Gal/hr at 1990 rpm

Torque and Engine Performance

  • Maximum Torque: Not listed
  • Torque Rise: Not listed

Hydraulic Performance

  • Maximum Force Exerted: Not listed
  • Pump Delivery Rate: Not listed
  • Hydraulic Power: Not listed

Overall Efficiency

  • Fuel Efficiency at Standard PTO Speed (540 rpm): 16.74 Hp.hr/gal
  • Fuel Consumption: 2.796 Gal/hr at rated engine speed of 2000 rpm

Other Specifications

  • Engine Type: Diesel, 3 cylinders, vertical
  • Bore and Stroke: 3.875" x 4.00"
  • Compression Ratio: 17 to 1
  • Displacement: 164.1 cubic inches
  • Weight (with ballast): Rear 4140 lbs, Front 1620 lbs, Total 5760 lbs



Nebraska Tractor Test Lab. (1966). Test 945: David Brown 770 Selectamatic (Diesel). Lincoln, NE: University of Nebraska-Lincoln. Retrieved from digitalcommons.unl.edu.

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