Introduction
Leader D 25-40 Half-Track Crawler Tractor
The Leader D 25-40 is a historic half-track crawler tractor manufactured in 1920 in Quincy, Illinois, USA. Designed for heavy-duty agricultural operations, this machine represents early 20th-century mechanical engineering in the heavy tractor segment.
Engine and Powertrain
The tractor is powered by a liquid-cooled Doman 4-cylinder engine with a displacement of 792 cubic inches (13.0 liters). It utilizes a Holley carburetor and is designed to operate on kerosene fuel. The engine reaches its rated output at 750 RPM and is started via a manual hand crank system.
Transmission and Drive
The drivetrain features a manual transmission configuration with two forward gears and one reverse gear. As a half-track vehicle, it utilizes rear tracks to distribute weight and improve traction on varied field conditions, complemented by a manual steering system.
Operating Capabilities
The D 25-40 provides a claimed drawbar horsepower of 25 hp (18.6 kW) and a belt horsepower of 40 hp (29.8 kW). This power output allows for the operation of 5 to 6 14-inch plows. The operator station is an open design, protected by a four-post canopy.
Dimensions and Weight
The tractor has an overall length of 153 inches (388 cm), a width of 64 inches (162 cm), and a height of 96 inches (243 cm). It has a base operating weight of 6,500 lbs (2,948 kg), contributing to its stability during heavy tillage tasks.
Conclusion
The Leader D 25-40 serves as a representative example of 1920s heavy-duty tractor design. With its significant displacement and half-track configuration, it was engineered for high-demand traction tasks, making it a notable machine for historians and collectors of early agricultural equipment.
Production Information of Leader, D 25-40
- Original price was $2,895 in 1920
- Half-track Crawler tractor
- Built in Quincy, Illinois, USA
| Manufacturer | Leader (a part of Dayton-Dick) |
|---|
Dimension and Tires Information of Leader, D 25-40
| Length | 153 inches [388 cm] |
|---|---|
| Weight | 6500 lbs [2948 kg] |
| Width | 64 inches [162 cm] |
| Height | 96 inches [243 cm] |
| Ag rear | Tracks |
|---|
Engine Specifications of Leader, D 25-40
- Doman
- Liquid-cooled
- Kerosene
- 4-cylinder
| Fuel system | Holley carburetor |
|---|---|
| Displacement | 792 ci [13.0 L] |
| Rated RPM | 750 |
| Bore/Stroke | 6.00x7.00 inches [152 x 178 mm] |
| Starter type | Hand crank |
Transmission Information of Leader, D 25-40
Transmission variants 1
| Type | Gear |
|---|---|
| Gears | 2 forward and 1 reverse |
Mechanical Specs of Leader, D 25-40
- Manual steering
- Open operator station with four-post canopy.
| Drive | Half-track |
|---|
Power Information of Leader, D 25-40
| Drawbar (claimed) | 25 hp [18.6 kW] |
|---|---|
| Belt (claimed) | 40 hp [29.8 kW] |
| Plows | 5-6 (14-inch) |
Where it sits
With 44 hp[B] HP, the Leader D 25-40 sits just above C 18-36 (40 HP) in Leader's range. Its power puts it in the 79th percentile of 1920s models in our database (181 machines).
Frequently asked questions
How much horsepower does the Leader D 25-40 have?
The Leader D 25-40 delivers 44 hp[B] HP.
What years was the Leader D 25-40 produced?
The Leader D 25-40 was produced in 1920.
What engine does the Leader D 25-40 have?
The Leader D 25-40 is powered by a 4-cylinder engine.
What transmission does the Leader D 25-40 use?
The Leader D 25-40 uses a Gear transmission.
How much does the Leader D 25-40 weigh?
The Leader D 25-40 weighs 6500 lbs [2948 kg].