David Brown 850 Specs ( 1960-1965 )
Overview
The David Brown 850 is a utility farm tractor manufactured in Meltham Mills, England, between 1960 and 1965. It is equipped with a 2.5L four-cylinder engine available in both diesel and gasoline variants, providing a claimed engine power of 35 hp. The mechanical layout includes a 6-speed unsynchronized gear transmission and an open operator station with a Category I rear hitch.
Ideal Applications
Tested Power Output:
According to Nebraska Tractor Test 734, the diesel variant produced 33.56 hp at the PTO and 30.93 hp at the drawbar, while the gasoline version in Test 735 reached 32.00 hp at the PTO.
Transmission and PTO Configuration:
The tractor features an unsynchronized gear transmission with six forward and two reverse speeds, complemented by a rear PTO capable of both 540 and 1000 RPM.
Chassis and Operating Weight:
This two-wheel drive model has a 75.25-inch wheelbase and an operating weight that ranges from 4,094 pounds for gasoline models to a ballasted weight of 5,874 pounds.
Production
| Description | Utility tractor / Built in Meltham Mills, Huddersfield, England |
|---|---|
| Manufacturer | David Brown |
Engine
| Engine type | David Brown 2.5L 4-cyl diesel / David Brown 2.5L 4-cyl gasoline |
|---|---|
| Fuel tank | 10.6 gal (40.1 L) |
| Air cleaner | oil bath / oil bath |
| Bore/Stroke | 3.50x4.00 inches (89 x 102 mm) / 3.50x4.00 inches (89 x 102 mm) |
| Compression | 17:1 / 6.25:1 |
| Coolant capacity | 14.4 qts (13.6 L) |
| Description | David Brown / diesel / 4-cylinder / liquid-cooled / David Brown / gasoline / 4-cylinder / liquid-cooled |
| Displacement | 154 ci (2.5 L) / 154 ci (2.5 L) |
| Fuel system | direct injection |
| Idle RPM | 700-2000 |
| Oil capacity | 10.1 qts (9.6 L) |
| Power | 35 hp (26.1 kW) |
| Rated RPM | 2000 / 2000 |
| Starter volts | 12 / 12 |
| Engine type | David Brown 2.5L 4-cyl diesel / David Brown 2.5L 4-cyl gasoline |
| Drawbar (claimed) | 30 hp (22.4 kW) |
| Drawbar (tested) | 30.93 hp (23.1 kW) |
| PTO (claimed) | 33 hp (24.6 kW) |
| PTO (tested) | 33.56 hp (25.0 kW) |
Transmission
| Clutch | dry disc |
|---|---|
| Description | Three gears (1-3) plus reverse (R) in two ranges (low and high). |
| Gears | 6 forward and 2 reverse |
| Transmission type | 6-speed unsynchronized gear |
| Type | unsynchronized gear |
Mechanical
| Cab | Open operator station. |
|---|---|
| Description | Manual steering / Differential mechanical expanding shoe brakes |
| Drive type | Two-wheel drive |
| Final drives | spur gear |
Hitch
| Rear Type | I |
|---|
PTO
| Clutch | dry disc |
|---|---|
| Engine RPM | 540@1800 |
| Rear PTO | transmission |
| Rear PTO Type | 540/1000 (1.375) |
Dimensions & Tires
| Ag front | 5.00-15 |
|---|---|
| Ag rear | 10-28 |
| Front tread | 52/56/60/64/68/72 inches (132/142/152/162/172/182 cm) |
| Height (hood) | 51.75 inches (131 cm) |
| Length | 113.5 inches (288 cm) |
| Rear tread | 52/56/60/64/68/72 inches (132/142/152/162/172/182 cm) |
| Wheelbase | 75.25 inches (191 cm) |
| Front tire | 5.00-15 |
| Rear tire | 10-28 |
| Weight | 3750 to 4179 pounds |
| Wheelbase | 75.25 inches (191 cm) |
David Brown 850 Weight
| Ballasted | 5874 lbs (2664 kg) |
|---|---|
| Diesel Operating | 4179 lbs (1895 kg) |
| Gas Operating | 4094 lbs (1857 kg) |
| Shipping | 3750 lbs (1701 kg) |
Nebraska Tractor Test 734
| Description | Diesel 6-speed 2WDMarch 12 - 26, 1960Link: Nebraska Tractor Test 734 file / PTO performance / Drawbar performance / Gear 3 used for power test. |
|---|---|
| Fuel use | 2.2 gal/hour (8.3 l/hour) / 1.7 gal/hour (6.4 l/hour) / 2.3 gal/hour (8.7 l/hour) |
| Max power | 30.93 hp (23.1 kW) |
| Power at rated engine speed | 33.56 hp (25.0 kW) |
| Power at rated PTO speed | 28.24 hp (21.1 kW) |
Nebraska Tractor Test 735
| Description | Gasoline 6-speed 2WDMarch 14 - April 2, 1960Link: Nebraska Tractor Test 735 file / PTO performance / Drawbar performance / Gear 3 used for power test. |
|---|---|
| Fuel use | 3.0 gal/hour (11.4 l/hour) / 2.6 gal/hour (9.8 l/hour) / 3.0 gal/hour (11.4 l/hour) |
| Max power | 27.64 hp (20.6 kW) |
| Power at rated engine speed | 32.00 hp (23.9 kW) |
| Power at rated PTO speed | 28.52 hp (21.3 kW) |
Speeds
| Description | With 10-28 rear tires. |
|---|
Tractor Tests
| Description | NTTL 734: diesel 6-speed 2WD / NTTL 735: gasoline 6-speed 2WD |
|---|