David Brown 850

The David Brown 850 is a tractor produced by David Brown. It is equipped with a 154 ci 2.5 L engine. The rated power output is 35 hp 26.1 kW. Transmission: 6 forward and 2 reverse. Operating weight: 3750 to 4179 pounds.

Overview

	1960 - 1965 Utility tractor
1960 - 1965
Utility tractor

Production
Manufacturer	David Brown
Utility tractor
Built in Meltham Mills, Huddersfield, England

David Brown 850 Transmission
6-speed unsynchronized gear
Transmission details ...

David Brown 850 Power
Engine	35 hp 26.1 kW
Drawbar (claimed)	30 hp 22.4 kW
PTO (claimed)	33 hp 24.6 kW
Drawbar (tested)	30.93 hp 23.1 kW
PTO (tested)	33.56 hp 25.0 kW
Performance test details ...

Mechanical
Two-wheel drive
Final drives	spur gear
Manual steering
Differential mechanical expanding shoe brakes
Open operator station.

Tractor hitch
Rear Type	I

Power Take-off (PTO)
Rear PTO	transmission
	live OptOptional
Clutch	dry disc
Rear PTO Type	540/1000 (1.375)
Engine RPM	540@1800
	540@1100
	1000@2000

Dimensions & Tires
Wheelbase	75.25 inches 191 cm
Weight	3750 to 4179 pounds
Front tire	5.00-15
Rear tire	10-28
Full dimensions and tires ...

Engine

Engine options
David Brown 2.5L 4-cyl diesel
David Brown 2.5L 4-cyl gasoline

Engine Detail — 154 ci / 2.5 L Diesel

Manufacturer	David Brown
Fuel Type	Diesel
Configuration	4-cylinder, liquid-cooled
Displacement	154 ci 2.5 L
Bore/Stroke	3.50x4.00 inches 89 x 102 mm
Power	35 hp 26.1 kW
Fuel system	direct injection
Air cleaner	oil bath
Compression	17:1
Rated RPM	2000
Idle RPM	700-2000
Starter volts	12
Oil capacity	10.1 qts 9.6 L
Coolant capacity	14.4 qts 13.6 L

Engine Detail — 154 ci / 2.5 L Gasoline

Manufacturer	David Brown
Fuel Type	Gasoline
Configuration	4-cylinder, liquid-cooled
Displacement	154 ci 2.5 L
Bore/Stroke	3.50x4.00 inches 89 x 102 mm
Air cleaner	oil bath
Compression	6.25:1
Rated RPM	2000
Starter volts	12

Transmission

Transmission — 6 forward and 2 reverse unsynchronized gear

Type	unsynchronized gear
Gears	6 forward and 2 reverse
Clutch	dry disc
Three gears (1-3) plus reverse (R) in two ranges (low and high).
With 10-28 rear tires.

Dimensions

David Brown 850 Tires
Ag front	5.00-15
Ag rear	10-28

Dimensions
Wheelbase	75.25 inches 191 cm
Length	113.5 inches 288 cm
Height (hood)	51.75 inches 131 cm
Front tread	52/56/60/64/68/72 inches 132/142/152/162/172/182 cm
Rear tread	52/56/60/64/68/72 inches 132/142/152/162/172/182 cm

David Brown 850 Weight
Shipping	3750 lbs 1701 kg
Gas Operating	4094 lbs 1857 kg
Diesel Operating	4179 lbs 1895 kg
Ballasted	5874 lbs 2664 kg

Tests

Tractor Tests
NTTL 734: diesel 6-speed 2WD
NTTL 735: gasoline 6-speed 2WD

Nebraska Tractor Test 734
Diesel 6-speed 2WD March 12 - 26, 1960 Link: Nebraska Tractor Test 734 file
PTO performance
Power at rated engine speed	33.56 hp 25.0 kW
Fuel use	2.2 gal/hour 8.3 l/hour
Power at rated PTO speed	28.24 hp 21.1 kW
Fuel use	1.7 gal/hour 6.4 l/hour
Drawbar performance
Max power	30.93 hp 23.1 kW
Fuel use	2.3 gal/hour 8.7 l/hour
Gear 3 used for power test.

Nebraska Tractor Test 735
Gasoline 6-speed 2WD March 14 - April 2, 1960 Link: Nebraska Tractor Test 735 file
PTO performance
Power at rated engine speed	32.00 hp 23.9 kW
Fuel use	3.0 gal/hour 11.4 l/hour
Power at rated PTO speed	28.52 hp 21.3 kW
Fuel use	2.6 gal/hour 9.8 l/hour
Drawbar performance
Max power	27.64 hp 20.6 kW
Fuel use	3.0 gal/hour 11.4 l/hour
Gear 3 used for power test.

Photos

David Brown 850