| Manufacturer |
David Brown |
| Price |
- |
| Model |
25 |
| Equipment Type |
- |
| Factory |
|
VARIANTS
| 25D |
diesel engine |
| 25C |
petrol engine |
NEBRASKA TRACTOR TEST 530 2
| Description |
Gasoline 6-speed 2WD/November 1 - 6, 1954/Link: Nebraska Tractor Test 530 file/Drawbar performance/Gear 4 used for power test./Gear 2 used for pull test. |
| Belt power (max) |
34.89 hp/26.0 kW |
| Belt fuel use (max) |
3.3 gal/hour/12.5 l/hour |
| Max power |
25.88 hp/19.3 kW |
| Max pull |
3,269 lbs/1482 kg |
DAVID BROWN 25 POWER
| Engine |
32 hp/23.9 kW |
| Gas Drawbar (claimed) |
24.1 hp/18.0 kW |
| Kerosene Drawbar (claimed) |
22.7 hp/16.9 kW |
| Drawbar (tested) |
25.88 hp/19.3 kW |
| Belt (tested) |
34.89 hp/26.0 kW |
ENGINES OVERVIEW
The David Brown 25 features a 2.5L 4-cylinder engine available in diesel, gasoline, and kerosene variants, providing versatility for different fuel preferences. The diesel variant offers better fuel economy and torque for agricultural tasks, while the gasoline and kerosene models may be more accessible for lighter duty operations. Key considerations include the availability of fuel types in your area and the specific power needs of your applications, as diesel is generally more efficient for heavy load work, whereas gasoline is easier to maintain for lighter tasks.
| Description |
David Brown 2.5L 4-cyl diesel/David Brown 2.5L 4-cyl gasoline/David Brown 2.5L 4-cyl kerosene |
ENGINE DETAIL 1
The David Brown 25 tractor, powered by a 4-cylinder, 2.5 L diesel engine with a robust 32 hp at 1800 RPM, offers a favorable torque curve for agricultural tasks. Its 15.9:1 compression ratio ensures efficient fuel combustion, which can enhance both power output and fuel economy. However, the relatively low RPM rating may limit speed and efficiency in larger-scale operations, making it more suited for smaller farms or specialized tasks.
| 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 |
32 hp/23.9 kW |
| Compression |
15.9:1 |
| Rated RPM |
1800 |
| Starter volts |
12 |
ENGINE DETAIL 2
The David Brown 25 tractor features a 4-cylinder, gasoline engine with a displacement of 154 ci (2.5 L), providing adequate power for moderate agricultural tasks. Its oil bath air cleaner enhances filtration, while a low compression ratio of 5.5:1 allows for good fuel efficiency but limits power output compared to modern tractors. Operating at a rated RPM of 1600 makes it suitable for applications requiring steady torque, but the lower RPM may challenge performance in demanding scenarios requiring rapid acceleration or high-speed operation.
| 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 |
5.5:1 |
| Rated RPM |
1600 |
| Starter volts |
12 |
ENGINE DETAIL 3
The David Brown 25 tractor, equipped with a kerosene 4-cylinder engine, offers a displacement of 154 cubic inches (2.5 L) and a bore/stroke ratio of 3.50x4.00 inches. With a low compression ratio of 4.7:1 and a rated RPM of 1600, it is optimized for torque-rich low-speed operations, making it ideal for plowing and heavy pulling tasks. However, its kerosene fuel requirement may limit availability and increase operational costs when compared to diesel alternatives.
| Description |
David Brown/kerosene/4-cylinder/liquid-cooled |
| Displacement |
154 ci/2.5 L |
| Bore/Stroke |
3.50x4.00 inches/89 x 102 mm |
| Compression |
4.7:1 |
| Rated RPM |
1600 |
DAVID BROWN 25 ENGINES
The David Brown 25 tractor is equipped with a 2.5L 4-cylinder engine available in diesel, gasoline, or kerosene variants, allowing for flexibility in fuel choice depending on availability and operational cost. The primary fuel tank capacity is 12.7 gallons (48.1 L), supporting extended operating hours but with a slightly smaller kerosene tank of 11.9 gallons (45.0 L) for those opting for that fuel type. An auxiliary fuel tank of 1.8 gallons (6.8 L) can help provide additional range or serve as a backup for short jobs, making this tractor suitable for diverse agricultural tasks.
| Description |
David Brown 2.5L 4-cyl diesel/David Brown 2.5L 4-cyl gasoline/David Brown 2.5L 4-cyl kerosene |
| Fuel tank |
12.7 gal/48.1 L |
| Kerosene Fuel tank |
11.9 gal/45.0 L |
| Aux. fuel |
1.8 gal/6.8 L |
TRANSMISSION
The David Brown 25 tractor features a 6-speed forward and 2-speed reverse gear system, providing versatility in various terrains and applications. The dry plate clutch offers durability and straightforward maintenance, but may require more effort during engagement compared to wet clutch systems. This tractor is suitable for both agricultural tasks and light industrial applications, though operators should be mindful of potential clutch wear with heavy use.
| Type |
gear |
| Gears |
6 forward and 2 reverse |
| Clutch |
dry plate |
MECHANICAL
The David Brown 25 features a 4x2 2WD chassis, making it suitable for lighter agricultural tasks but limiting traction on uneven terrain or during wet conditions. Its manual steering and mechanical shoe brakes can pose challenges in maneuverability and stopping power, especially under heavy loads. With a 6-speed gear transmission, this tractor provides flexibility in speed for different applications, but it may lack the advanced automation found in modern tractors, potentially increasing operator fatigue during prolonged use.
| Chassis |
4x2 2WD |
| Steering |
manual |
| Brakes |
mechanical shoe |
| Cab |
Open operator station. |
| Transmission |
6-speed gear |
HYDRAULICS
| Total flow |
9.5 gpm/36.0 lpm |
TRACTOR HITCH
| Rear lift |
1,300 lbs/589 kg |
POWER TAKE-OFF (PTO)
DAVID BROWN 25 TIRES
The David Brown 25 tractor features an agricultural front tire size of 6.00-19 and a rear tire size of 11-28, optimizing traction and weight distribution for various farming tasks. The larger rear tires enhance stability and improve load-carrying capacity, ideal for plowing and heavier implements. However, the limited tire dimensions may pose challenges on uneven terrain, necessitating careful operation to prevent slippage or loss of control.
| Ag front |
6.00-19 |
| Ag rear |
11-28 |
DIMENSIONS
| Wheelbase |
74.8 inches/189 cm |
| Length |
113 inches/287 cm |
| Weight |
3,715 lbs/1685 kg |
| Ground clearance |
15.4 inches/39 cm |
| Front tread |
49.5 to 62 inches/125 to 157 cm |
| Rear tread |
48 to 68 inches/121 to 172 cm |
DIMENSIONS & TIRES
The David Brown 25 tractor features a compact wheelbase of 74.8 inches, enhancing maneuverability in tight spaces, which is advantageous for small to medium agricultural operations. Weighing 3,715 lbs, it provides stability but may limit mobility on softer ground conditions. The tire specifications (front: 6.00-19; rear: 11-28) suggest a balanced weight distribution, which is essential for traction and power transfer during field tasks, although tire selection might affect performance on varied terrains.
| Wheelbase |
74.8 inches/189 cm |
| Weight |
3,715 lbs/1685 kg |
| Front tire |
6.00-19 |
| Rear tire |
11-28 |
25 SERIAL NUMBERS
| 1954 |
P25/15896 |
| 1955 |
P25/16998 |
| 1956 |
P25/19041 |
| 1957 |
P25/ |
| 1958 |
P25/ |
| Final |
P25/21318 |
ELECTRICAL
| Charging system |
generator |
