| Manufacturer |
David Brown |
| Price |
- |
| Model |
900 |
| Equipment Type |
Row-Crop Tractors |
| Factory |
|
DAVID BROWN 900 POWER
| Engine |
45.5hp / 33.9kW |
| Belt (claimed) |
32hp / 23.9kW (kerosene)/ 35hp / 26.1kW (diesel/gas)/ 40hp / 29.8kW (high-compression) |
ENGINES OVERVIEW
The David Brown 900 tractor features a versatile 2.7L 4-cylinder engine available in diesel, kerosene, and gasoline variants, allowing for adaptability based on fuel availability and specific operational needs. Diesel engines offer superior torque and fuel efficiency, while gasoline and kerosene options may provide easier starting in cold conditions. However, potential challenges include maintenance complexity and the need for specific fuel management strategies depending on the chosen variant.
| Description |
David Brown 2.7L 4-cyl diesel David Brown 2.7L 4-cyl kerosene David Brown 2.7L 4-cyl gasoline |
ENGINE DETAIL 1
The David Brown 900 tractor features a robust AD4 30H diesel engine with a displacement of 2.7L, delivering 40hp at 2200 RPM and peak torque of 105 lb-ft at 1300 RPM, providing efficient low-end power suitable for diverse agricultural tasks. With a compression ratio of 15.9:1, it promotes better fuel efficiency, butmay require high-quality diesel fuel to avoid knocking. Its liquid-cooled system, with coolant and oil capacities of 14qt and 7qt respectively, ensures optimal performance, but regular maintenance of coolant and oil levels is essential for engine longevity.
| Description |
David Brown AD4 30H diesel 4-cylinder liquid-cooled |
| Displacement |
165ci / 2.7L |
| Bore/Stroke |
3.625x4.00inches / 92 x 102mm |
| Power |
40hp / 29.8kW |
| Compression |
15.9:1 |
| Rated RPM |
2200 |
| Torque |
105 lb-ft/142.4 Nm |
| Torque RPM |
1300 |
| Firing order |
1-2-4-3 |
| Starter type |
electric |
| Oil capacity |
7qts / 6.6L |
| Coolant capacity |
14qts / 13.2L |
| Intake valve clearance |
0.015inches / 0.381mm (hot) |
| Exhaust valve clearance |
0.015inches / 0.381mm (hot) |
ENGINE DETAIL 2
The David Brown 900 tractor, powered by a 2.7L AK4 engine, delivers a modest 37.5hp at 2200 RPM, making it suitable for light agricultural tasks but potentially underpowered for heavier applications. With a compression ratio of 4.7:1, this model is optimized for kerosene use, offering improved fuel efficiency but may face challenges in cold starting due to lower compression levels. Key maintenance points include regular checks on the valve clearance and coolant capacity, crucial for maintaining operational efficiency and engine longevity.
| Description |
David Brown AK4 30H kerosene 4-cylinder liquid-cooled |
| Displacement |
165ci / 2.7L |
| Bore/Stroke |
3.625x4.00inches / 92 x 102mm |
| Power |
37.5hp / 28.0kW |
| Fuel system |
Slex 30FV carburetor |
| Compression |
4.7:1 |
| Rated RPM |
2200 |
| Torque |
110lb-ft / 149.2Nm |
| Torque RPM |
1000 |
| Firing order |
1-2-4-3 |
| Starter |
electric |
| Starter volts |
12 |
| Oil capacity |
7qts / 6.6L |
| Coolant capacity |
14qts / 13.2L |
| Intake valve clearance |
0.015inches / 0.381mm (hot) |
| Exhaust valve clearance |
0.022inches / 0.559mm (hot) |
ENGINE DETAIL 3
The David Brown 900 tractor features a 4-cylinder liquid-cooled gasoline engine with a displacement of 2.7L, delivering 40.5hp at a rated RPM of 2200, making it suitable for moderate agricultural tasks. The Solex 30FV carburetor provides efficient fuel delivery, while the relatively low compression ratio of 5.5:1 indicates it is designed for lower RPM operation, which enhances reliability but may limit performance under heavy load. Maintenance considerations include an oil capacity of 7 quarts and defined valve clearances (0.015 in for intake, 0.022 in for exhaust), requiring regular monitoring to ensure optimal engine function and longevity.
| Description |
David Brown AG4 30H gasoline 4-cylinder liquid-cooled |
| Displacement |
165ci / 2.7L |
| Bore/Stroke |
3.625x4.00inches /92 x 102mm |
| Power |
40.5hp / 30.2kW |
| Fuel system |
Solex 30FV carburetor |
| Compression |
5.5:1 |
| Rated RPM |
2200 |
| Firing order |
1-2-4-3 |
| Starter |
electric |
| Starter volts |
12 |
| Oil capacity |
7 qts/6.6 L |
| Coolant capacity |
14 qts/13.2 L |
| Intake valve clearance |
0.015 inches/0.381 mm (hot) |
| Exhaust valve clearance |
0.022 inches/0.559 mm (hot) |
ENGINE DETAIL 4
The David Brown 900 tractor features a high-compression gasoline engine with a displacement of 2.7 L, generating 45.5 hp at a rated RPM of 2200, making it suitable for varied agricultural tasks with moderate power requirements. Its liquid-cooled system and Solex 30FV carburetor support efficient fuel combustion, though the 7:1 compression ratio may limit performance at higher elevations. Regular maintenance of valve clearances (0.015" intake; 0.022" exhaust) is crucial for optimal engine performance and longevity, particularly in demanding operating conditions.
| Description |
David Brown PAG4/30H/gasoline/4-cylinder/liquid-cooled/High-compression gasoline engine for premium fuel. |
| Displacement |
165 ci/2.7 L |
| Bore/Stroke |
3.625x4.00 inches/92 x 102 mm |
| Power |
45.5 hp/33.9 kW |
| Fuel system |
Solex 30FV carburetor |
| Compression |
7:1 |
| Rated RPM |
2200 |
| Firing order |
1-2-4-3 |
| Starter |
electric |
| Starter volts |
12 |
| Oil capacity |
7 qts/6.6 L |
| Intake valve clearance |
0.015 inches/0.381 mm (hot) |
| Exhaust valve clearance |
0.022 inches/0.559 mm (hot) |
DAVID BROWN 900 ENGINES
The David Brown 900 tractor features a versatile 2.7L 4-cylinder engine available in diesel, kerosene, and gasoline options, providing flexibility depending on fuel availability and operational costs. The fuel tank capacities (11.5 gallons for diesel/gasoline and 10 gallons for kerosene) ensure decent operating range for agricultural tasks, although the smaller kerosene tank may require more frequent refueling in extensive operations. A notable advantage is the auxiliary fuel tank, which adds an additional 1.5 gallons, potentially extending run time for smaller tasks, though it may impact the overall weight distribution and balance when full.
| Description |
David Brown 2.7L 4-cyl diesel/David Brown 2.7L 4-cyl kerosene/David Brown 2.7L 4-cyl gasoline |
| Fuel tank |
11.5 gal/43.5 L (diesel/gas)/10 gal/37.9 L (kerosene) |
| Aux. fuel |
1.5 gal/5.7 L |
TRANSMISSION
The David Brown 900 tractor features a 6-speed forward and 2-speed reverse transmission, allowing for versatile speed management in various agricultural tasks. Its dry disc clutch (254mm) offers robust engagement but may require careful operation to avoid slippage under heavy loads. The oil capacity of 16 quarts (15.1 L) supports effective lubrication, essential in prolonging the transmission's operational lifespan, especially during extended use.
| Transmission |
David Brown |
| Gears |
6 forward and 2 reverse |
| Clutch |
254mm dry disc |
| Oil capacity |
16 qts/15.1 L |
| Description |
Three gears (1-3) plus reverse (R) in two ranges (low/high). |
SPEEDS
MECHANICAL
The David Brown 900 tractor features a 4x2 2WD chassis, providing decent traction for light to moderate fieldwork but may struggle in muddy conditions. Its manual steering and mechanical drum brakes can lead to a more labor-intensive operation and longer stopping distances, which could be challenging on uneven terrain. The 6-speed transmission offers a range of speed options, enhancing versatility for various tasks but may require operator skill to maximize efficiency.
| Chassis |
4x2 2WD |
| Steering |
manual |
| Brakes |
mechanical drum |
| Cab |
Open operator station. |
| Transmission |
6-speed |
TRACTOR HITCH
| Rear Type |
I |
| Rear lift (at ends) |
1800 lbs/816 kg |
POWER TAKE-OFF (PTO)
| Rear PTO |
transmission/live (optional) |
| Rear RPM |
540 |
| Engine RPM |
545@1600 |
DAVID BROWN 900 TIRES
The David Brown 900 features standard agricultural tires that offer solid traction and stability, particularly important for heavy-duty tasks such as plowing and tilling. However, the mismatch in tire sizes (11.00x28 front vs. 6.00x16 rear), may lead to handling inconsistencies and potential drivetrain strain if not properly managed. For optimal performance, consider uniform tire sizes or consult specifications for proper load distribution based on intended use scenarios like crop production or transport tasks.
| Standard tires (ag) |
Front: 11.00x28. Rear:/Front: 13x28. Rear: |
| Ag front |
6.00x16 |
| Ag rear |
5.50x16 |
DIMENSIONS
| Wheelbase |
72 inches/182 cm |
| Length |
113 inches/287 cm |
| Width |
65 inches/165 cm |
| Height |
77.75 inches/197 cm |
| Height (hood) |
54.5 inches/138 cm |
| Diesel Weight |
4000 lbs/1814 kg |
| Kerosene Weight |
3900 lbs/1769 kg |
| Clearance (front axle) |
16 inches/40 cm |
| Front tread |
52/56/60/64/68/72/86 inches/132/142/152/162/172/182/218 cm |
| Rear tread |
52/56/60/64/68/72/86 inches/132/142/152/162/172/182/218 cm |
DIMENSIONS & TIRES
The David Brown 900, with a wheelbase of 72 inches, provides good stability and maneuverability for varied agricultural tasks. Weighing between 3,900 to 4,000 pounds, it offers substantial traction, yet may present challenges in transport and soil compaction, especially in sensitive environments. The front tire specification of 11.00x28 indicates suitability for heavier load-bearing tasks, but may require careful consideration to ensure optimal inflation levels for performance and efficiency.
| Wheelbase |
72 inches/182 cm |
| Weight |
3900 to 4000 pounds |
| Front tire |
11.00x28 |
BELT PULLEY
| Diameter |
8.5 inches/21 cm |
| Width |
5.75 inches/14 cm |
| RPM |
1405 |
| Speed |
3125 ft/min/952.50 meters/min |
