David Brown 25
The David Brown 25 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): 32 hp / 23.9 kW. Transmission: 6 forward and 2 reverse. Operating weight: 3,715 lbs 1685 kg.
Engine Power
Diesel (listed): 32 hp / 23.9 kW
Fuel & Capacities
Kerosene
Transmission
6 forward and 2 reverse
Operating Weight
3,715 lbs
1685 kg
Overview
 | 1953 - 1958 |
|---|
Production | |
|---|---|
Manufacturer | David Brown |
Variants | |
|---|---|
25D | diesel engine |
25C | petrol engine |
David Brown 25 Transmission | |
|---|---|
6-speed gear | |
Transmission details ...  |
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 |
Performance test details ...  | |
Mechanical | |
|---|---|
Two-wheel drive | |
Steering | manual |
Mechanical shoe brakes | |
Open operator station. | |
Hydraulics | |
|---|---|
Total flow | 9.5 gpm
36.0 lpm |
Tractor hitch | |
|---|---|
Rear lift | 1,300 lbs
589 kg |
Power Take-off (PTO) | |
|---|---|
Rear PTO Type | 540 |
Dimensions & Tires | |
|---|---|
Wheelbase | 74.8 inches
189 cm |
Weight | 3,715 lbs
1685 kg |
Front tire | 6.00-19 |
Rear tire | 11-28 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Charging system | generator |
References | |
|---|---|
 | |
Field Force published in 1953, by David Brown | |
25D published in 1954, by David Brown | |
25D Diesel published in 1957, by David Brown |
Engine
Engine options | |
|---|---|
David Brown 2.5L 4-cyl diesel | |
David Brown 2.5L 4-cyl gasoline | |
David Brown 2.5L 4-cyl kerosene |
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 | 32 hp
23.9 kW |
Compression | 15.9:1 |
Rated RPM | 1800 |
Starter volts | 12 |
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 | 5.5:1 |
Rated RPM | 1600 |
Starter volts | 12 |
Engine Detail — 154 ci / 2.5 L Kerosene
Manufacturer | David Brown |
Fuel Type | Kerosene |
Configuration | 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 |
Transmission
Transmission — 6 forward and 2 reverse gear
Type | gear |
Gears | 6 forward and 2 reverse |
Clutch | dry plate |
 | |
Dimensions
David Brown 25 Tires | |
|---|---|
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 |
Tests
Nebraska Tractor Test 530 | |
|---|---|
Gasoline 6-speed 2WD
November 1 - 6, 1954
Link: Nebraska Tractor Test 530 file | |
Belt power (max) | 34.89 hp
26.0 kW |
Belt fuel use (max) | 3.3 gal/hour
12.5 l/hour |
Drawbar performance | |
Max power | 25.88 hp
19.3 kW |
Gear 4 used for power test. | |
Max pull | 3,269 lbs
1482 kg |
Gear 2 used for pull test. | |
Photos
David Brown 25C
David Brown 25C
David Brown 25C
David Brown 25D with factory cab.
David Brown 25D with factory cab.
Recommended Implements & Sizing Guide
Engineering recommendations for David Brown 25 based on its 32 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. |
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 25.
Estimated Continuous Field Runtime: 2 hrs
Approximately 2 hours of continuous field operation at ~75% rated power on a full tank (3.3 gal / 12.5 L).
Estimated 75% Load Fuel Burn~1.7 gal/hr (6.3 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 25 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for David Brown 25.
Converted Equivalents:
Horsepower (HP)32 hp
Kilowatts (kW)23.9 kW
Metric Horsepower (PS / CV)32.4 PS
Direct Competitor Comparison
Compare David Brown 25 against same-era industry alternatives in the same horsepower class.
Current Model
David Brown
David Brown 25
Engine Power:Diesel (listed): 32 hp / 23.9 kW
★ Baseline Reference
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