| Manufacturer |
David Brown |
| Price |
- |
| Model |
850 |
| Equipment Type |
Utility Tractors |
| Factory |
Meltham Mills, Huddersfield, England |
NEBRASKA TRACTOR TEST 734
| Description |
Diesel 6-speed 2WD/March 12 - 26, 1960/Link: Nebraska Tractor Test 734 file/PTO performance/Drawbar performance/Gear 3 used for power test. |
| Power at rated engine speed |
33.56 hp/25.0 kW |
| Fuel use |
2.3 gal/hour/8.7 l/hour |
| Power at rated PTO speed |
28.24 hp/21.1 kW |
| Max power |
30.93 hp/23.1 kW |
NEBRASKA TRACTOR TEST 735
| Description |
Gasoline 6-speed 2WD/March 14 - April 2, 1960/Link: Nebraska Tractor Test 735 file/PTO performance/Drawbar performance/Gear 3 used for power test. |
| 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 |
| Max power |
27.64 hp/20.6 kW |
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 |
ENGINES OVERVIEW
The David Brown 850 tractor features a robust 2.5L 4-cylinder engine available in both diesel and gasoline variants, providing versatility depending on the application. Advantages include good fuel efficiency and ease of maintenance, while challenges may arise from parts availability for older models. This tractor is suitable for light to moderate agricultural tasks, making it an ideal choice for small farms or horticultural endeavors.
| Description |
David Brown 2.5L 4-cyl diesel/David Brown 2.5L 4-cyl gasoline |
ENGINE DETAIL 1
The David Brown 850 tractor boasts a robust 2.5 L 4-cylinder diesel engine, delivering 35 hp at 2000 RPM, making it suitable for moderate farm tasks and light utility work. Its oil bath air cleaner promotes better filtration, though it may require more maintenance compared to paper filters. With a 17:1 compression ratio, it offers good fuel efficiency, but the 10.1 qt oil capacity necessitates regular checks to ensure optimal performance and longevity.
| Description |
David Brown/diesel/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 2
The David Brown 850 features a 154 ci (2.5 L) gasoline, 4-cylinder engine with a low compression ratio of 6.25:1, making it efficient for farm operations that require moderate power at 2000 RPM. With its oil bath air cleaner, it offers superior filtration in dusty conditions, although the lower rated RPM may limit performance in high-speed applications. Ideally suited for tasks like plowing and cultivating, it balances power and simplicity, but may face challenges with fuel efficiency compared to diesel alternatives.
| Description |
David Brown/gasoline/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 |
DAVID BROWN 850 ENGINES
The David Brown 850 tractor is equipped with a 2.5L 4-cylinder engine, available in both diesel and gasoline variants, offering flexibility depending on fuel availability and operational requirements. With a fuel tank capacity of 10.6 gallons (40.1 liters), it strikes a balance between weight efficiency and operational range, making it suitable for various farming tasks. However, users should consider the higher fuel consumption in heavier workloads, especially with the gasoline engine, which might necessitate more frequent refueling compared to diesel operations.
| Description |
David Brown 2.5L 4-cyl diesel/David Brown 2.5L 4-cyl gasoline |
| Fuel tank |
10.6 gal/40.1 L |
TRANSMISSION
The David Brown 850 tractor features an unsynchronized gear transmission, providing 6 forward and 2 reverse gears across two ranges, which can be advantageous for tasks requiring variable speed control in different terrains. The dry disc clutch ensures efficient power transfer but may require more maintenance than wet clutches, especially under heavy loads. This configuration is ideal for farming operations that necessitate frequent gear shifts, but operators should be aware of the learning curve associated with unsynchronized shifting.
| Type |
unsynchronized gear |
| Gears |
6 forward and 2 reverse |
| Clutch |
dry disc |
| Description |
Three gears (1-3) plus reverse (R) in two ranges (low and high). |
SPEEDS
| Description |
With 10-28 rear tires./ |
MECHANICAL
The David Brown 850 features a 4x2 2WD chassis, providing basic traction suitable for light agricultural tasks but may struggle on uneven terrains. Its manual steering and unsynchronized 6-speed transmission require operator skill for smooth gear changes, potentially resulting in increased operator fatigue during extended use. The open operator station enhances visibility and accessibility but offers limited protection from weather, which may necessitate additional operator consideration in adverse conditions.
| Chassis |
4x2 2WD |
| Final drives |
spur gear |
| Steering |
manual |
| Brakes |
differential mechanical expanding shoe |
| Cab |
Open operator station. |
| Transmission |
6-speed unsynchronized gear |
TRACTOR HITCH
POWER TAKE-OFF (PTO)
| Rear PTO |
transmission/live |
| Clutch |
dry disc |
| Rear RPM |
540/1000 (1.375) |
| Engine RPM |
540@1800/540@1100/1000@2000 |
DAVID BROWN 850 TIRES
The David Brown 850 tractor features a front tire size of 5.00-15 and rear tires of 10-28, providing a balanced traction and stability suitable for light to moderate agricultural tasks. The compact tire setup enhances maneuverability in tighter spaces, making it ideal for small farms or orchards. However, the relatively narrow rear tires may struggle in loose or muddy conditions, potentially impacting performance in heavy tillage scenarios.
| 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 |
DIMENSIONS & TIRES
The David Brown 850 tractor features a wheelbase of 75.25 inches, providing stability for various agricultural tasks. With a weight range of 3750 to 4179 pounds, it offers a favorable power-to-weight ratio for efficient operation in moderate terrains. The front tire size of 5.00-15 and rear tire size of 10-28 enhance traction and load-bearing capacity, making it suitable for plowing and towing applications.
| Wheelbase |
75.25 inches/191 cm |
| Weight |
3750 to 4179 pounds |
| Front tire |
5.00-15 |
| Rear tire |
10-28 |
