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 listed engine power is Diesel (listed): 35 hp / 26.1 kW. Transmission: 6 forward and 2 reverse. Operating weight: 3750 to 4179 pounds.
Engine Power
Diesel (listed): 35 hp / 26.1 kW
Fuel & Capacities
Gasoline
Transmission
6 forward and 2 reverse
Operating Weight
3750 to 4179 pounds
Overview
 | 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
Recommended Implements & Sizing Guide
Engineering recommendations for David Brown 850 based on its 35 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 2 to 3 Bottom (14-16")2 - 3 铧 (35-40 cm) | Medium Duty | Standard utility farm tillage. |
Rotary Cutter / MowerMowing & Clearing | 5 ft (60 in)1.5 m | Medium Duty | Pasture maintenance and weeds up to 1.5" diameter. |
Rotary TillerSeedbed Prep | 54 to 60 in135 - 150 cm | Medium Duty | Thorough seedbed preparation in orchards and vegetable plots. |
Disc HarrowSecondary Tillage | 5 to 6 ft (16-18" discs)1.5 - 1.8 m (40-45 cm 耙片) | Light Duty | Small acreage soil break-up and secondary aeration. |
Hay BalerHay & Forage | Small Square Baler (14x18")小方捆打捆机 (36x46 cm) | Medium Duty | Classic 2-string baler for horse and small livestock hay. |
Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.
Fluids, Capacities & Working Autonomy
Standard fluid requirements, service intervals, and continuous runtime estimates for David Brown 850.
Estimated Continuous Field Runtime: 1.6 hrs
Approximately 1.6 hours of continuous field operation at ~75% rated power on a full tank (3 gal / 11.4 L).
Estimated 75% Load Fuel Burn~1.8 gal/hr (6.9 L/hr)
Engine Crankcase Oil
SAE 15W-40 (Heavy Duty Diesel)
Standard Spec: API CK-4 / CJ-4 Heavy Duty
Service Interval: 150 – 250 Hours
Transmission & Hydraulic System
UTTO (Universal Tractor Transmission Oil)
Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)
Service Interval: 600 – 1000 Hours
Engine Cooling System
50/50 Ethylene Glycol Pre-mix
Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze
Service Interval: 2 Years / 1500 Hours
David Brown 850 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for David Brown 850.
Converted Equivalents:
Horsepower (HP)35 hp
Kilowatts (kW)26.1 kW
Metric Horsepower (PS / CV)35.5 PS
Direct Competitor Comparison
Compare David Brown 850 against same-era industry alternatives in the same horsepower class.
Current Model
David Brown
David Brown 850
Engine Power:Diesel (listed): 35 hp / 26.1 kW
★ Baseline Reference
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