Introduction
David Brown 770 Utility Tractor
The David Brown 770 is a utility tractor produced in Meltham Mills, Huddersfield, England, between 1965 and 1970. Part of the 880 series lineage, it was designed as a compact and versatile machine for general agricultural operations.
Engine and Performance
The tractor is powered by the David Brown AD3/49, a 3-cylinder, liquid-cooled diesel engine with a displacement of 146.1 cubic inches (2.4 liters). It utilizes direct injection and features a compression ratio of 17:1. The engine provides 36 hp at a rated speed of 2055 RPM and delivers 100 lb-ft (135.6 Nm) of torque at 1400 RPM.
Transmission and Mechanical Systems
The powertrain includes a gear-type transmission offering 12 forward and 4 reverse gears, coupled with a dry disc clutch. The mechanical configuration is a two-wheel drive system featuring manual steering and mechanical drum brakes. A mechanical rear differential lock is included to assist with traction in field conditions.
Hydraulics and Hitch
The hydraulic system is an open-center type operating at a pressure of 2000 psi (137.9 bar) with a pump flow of 6.6 gpm (25.0 lpm). The rear hitch is a Category I system equipped with both position and draft control, capable of lifting 1600 lbs (725 kg) at the ends.
Power Take-Off
The 770 is equipped with a live rear PTO. It operates at 540 RPM, which is achieved when the engine is running at 1620 RPM. The PTO shaft standard is 1.375 inches.
Conclusion
The David Brown 770 is a robust utility tractor suited for light to medium-duty agricultural tasks. Its combination of a 12-speed transmission and manageable hydraulic lift capacity makes it a functional choice for smaller operations requiring reliable, mechanical-based equipment.
David Brown 770 Manuals & Documentation
Download the manuals and documentation available for the David Brown 770: repair and workshop manuals, operator's handbooks, spare-parts catalogs and technical leaflets — free PDF files.
Archive documentation provided for reference, hosted by Tractor-Info.
Production Information of David Brown, 770
- Original price was $3,600 in 1970
- Utility tractor
- Built in Meltham Mills, Huddersfield, England
| Manufacturer | David Brown |
|---|
Dimension and Tires Information of David Brown, 770
| Front tread | 48/52/56/60/64/68/72/76 inches [121/132/142/152/162/172/182/193 cm] |
|---|---|
| Wheelbase | 75 inches [190 cm] |
| Height (exhaust) | 80.5 inches [204 cm] |
| Height (steering wheel) | 55.5 inches [140 cm] |
| Length | 112.5 inches [285 cm] |
| Rear tread | 48/52/56/60/64/68/72/76 inches [121/132/142/152/162/172/182/193 cm] |
| Clearance (drawbar) | 11 inches [27 cm] |
| Width | 64 inches [162 cm] |
| Ag front | 6.00-16 |
|---|---|
| Ag rear | 11.2/10-28 |
| Ag rear | 12.4/11-28 |
| Ag front | 5.50-16 |
Engine Specifications of David Brown, 770
- David Brown AD3/49
- Liquid-cooled
- Diesel
- 3-cylinder
| Starter volts | 12 |
|---|---|
| Starter | Electric |
| Fuel system | Direct injection |
| Oil capacity | 7.8 qts [7.4 L] |
| Rated RPM | 2055 |
| Idle RPM | 700-2000 |
| Compression | 17:1 |
| Displacement | 146.1 ci [2.4 L] |
| Power | 36 hp [26.8 kW] |
| Bore/Stroke | 3.94x4.00 inches [100 x 102 mm] |
| Firing order | 1-2-3 |
| Coolant capacity | 12 qts [11.4 L] |
| Torque RPM | 1400 |
| Torque | 100 lb-ft [135.6 Nm] |
Transmission Information of David Brown, 770
Transmission variants 1
| Type | Gear |
|---|---|
| Oil capacity | 28.8 qts [27.3 L] |
| Gears | 12 forward and 4 reverse |
| Clutch | Dry disc |
Mechanical Specs of David Brown, 770
- Two-wheel drive
- Mechanical drum brakes
- Manual steering
- Open operator station.
| Final drives | Spur gear |
|---|---|
| Differential lock | Mechanical rear |
Power Information of David Brown, 770
| Rear PTO | Live |
|---|---|
| Rear PTO Type | 540 (1.375) |
| Engine RPM | 540@1620 |
Hydraulics Specifications of David Brown, 770
| Type | Open center |
|---|---|
| Pressure | 2000 psi [137.9 bar] |
| Pump flow | 6.6 gpm [25.0 lpm] |
Three-Point Hitch of David Brown, 770
| Rear Type | I |
|---|---|
| Control | Position and draft control |
| Rear lift (at ends) | 1600 lbs [725 kg] |
Electrical System of David Brown, 770
| Ground | Negative |
|---|---|
| Battery volts | 12 |
| Battery AH | 96 |
Where it sits
With 36 HP, the David Brown 770 sits just below 880 (44 HP) in David Brown's range. Its power puts it in the 25th percentile of 1960s models in our database (709 machines).
Frequently asked questions
How much horsepower does the David Brown 770 have?
The David Brown 770 delivers 36 HP.
What years was the David Brown 770 produced?
The David Brown 770 was produced in 1965-1970.
What engine does the David Brown 770 have?
The David Brown 770 is powered by a Diesel, 3-cylinder engine.
What transmission does the David Brown 770 use?
The David Brown 770 uses a Gear transmission.
Is the David Brown 770 4WD?
The David Brown 770 is available in 2WD.