David Brown 780 Specs ( 1967-1971 )
Overview
The David Brown 780 is a two-wheel drive farm tractor produced between 1967 and 1971 in Meltham Mills, England, with a total production run of 8,986 units. It is powered by a 2.7L three-cylinder diesel engine producing a gross 46 hp, featuring either a 6-speed or 12-speed sliding gear transmission.
Ideal Applications
Engine and PTO Output:
The 2.7L liquid-cooled diesel engine is rated at 2200 RPM and delivered a maximum claimed PTO output of 42.9 hp and a claimed drawbar power of 38.9 hp.
Mechanical and Hydraulic Systems:
Equipped with manual steering and mechanical drum brakes, the unit features a Category I rear hitch with a 1,600 lb lift capacity supported by a 7.4 gpm hydraulic pump.
Physical Dimensions and Chassis:
The chassis measures 111.75 inches in length with a 75.8-inch wheelbase and provides 11.75 inches of ground clearance, with a total weight of 3,470 lbs.
Production
| Description | Built in Meltham Mills, Huddersfield, England / Original price was $4,000 in 1971 |
|---|---|
| Manufacturer | David Brown |
| Total built | 8,986 |
Engine
| Engine type | David Brown 2.7L 3-cyl diesel |
|---|---|
| Fuel tank | 9.5 gal (36.0 L) |
| Bore/Stroke | 3.9375x4.50 inches (100 x 114 mm) |
| Compression | 17:1 |
| Coolant capacity | 10 qts (9.5 L) |
| Description | David Brown / diesel / 3-cylinder / liquid-cooled |
| Displacement | 164.4 ci (2.7 L) |
| Firing order | 1-2-3 |
| Idle RPM | 700-2200 |
| Oil capacity | 6.5 qts (6.2 L) |
| Power (gross) | 46 hp (34.3 kW) |
| Rated RPM | 2200 |
| Drawbar (claimed) | 38.9 hp (29.0 kW) |
| Engine (gross) | 46 hp (34.3 kW) |
| PTO (claimed) | 42.9 hp*Maximum PTO power. Rated power at 540 RPM was 37.1 HP. (32.0 kW) |
Transmission
| Clutch | dry disc / dry disc |
|---|---|
| Gears | 12 forward and 4 reverse / 6 forward and 2 reverse |
| Oil capacity | 24 qts (22.7 L) |
| Transmission | sliding gear |
| Transmission type | 12-speed / 6-speed |
| Transmission type | 12-speed / 6-speed |
Mechanical
| Description | Manual steering / Mechanical drum brakes |
|---|---|
| Drive type | Two-wheel drive |
Hydraulics
| Oil type | SAE20W30SAE20W40 |
|---|---|
| Pressure | 2000 psi (137.9 bar) |
| Pump flow | 7.4 gpm (28.0 lpm) |
Hitch
| Rear lift | 1600 lbs (725 kg) |
|---|---|
| Rear Type | I |
PTO
| Engine RPM | 540@1828 |
|---|---|
| Rear PTO | live |
| Rear PTO Type | 540/1000 |
Electrical
| Ground | negative |
|---|
Dimensions & Tires
| Ag front | 6.00-16 |
|---|---|
| Ag rear | 12.4/11-28 |
| Ground clearance | 11.75 inches (29 cm) |
| Height | 82.5 inches (209 cm) |
| Length | 111.75 inches (283 cm) |
| Weight | 3,470 lbs (1573 kg) |
| Wheelbase | 75.8 inches (192 cm) |
| Width | 64 inches (162 cm) |
| Front tire | 6.00-16 |
| Rear tire | 12.4/11-28 |
| Weight | 3,470 lbs (1573 kg) |
| Wheelbase | 75.8 inches (192 cm) |
780 Serial Numbers
| 1967 | 600001 |
|---|---|
| 1968 | 600879 |
| 1969 | 602853 |
| 1970 | 606109 |
| 1971 | 609665 |
| Description | FAQ: How to read a serial number table. |
| Location: | Front-right side of chassis, just behind the radiator |