Introduction
Rock Island G 15-25: A Standard-Tread Agricultural Tractor
The Rock Island G 15-25 is a vintage standard-tread tractor produced between 1927 and 1928, representing the earlier iterations of the G2 series which continued through 1932. Manufactured in Rock Island, Illinois, USA, this machine was designed for general agricultural duties during the interwar period.
Engine and Performance
The tractor is powered by a Waukesha 4-cylinder engine with a displacement of 326 cubic inches (5.3 liters). It features a liquid-cooling system and is designed to operate on kerosene. The engine delivers a claimed 15 hp (11.2 kW) at the drawbar for traction tasks and 25 hp (18.6 kW) at the belt for stationary equipment operation.
Drivetrain and Mechanical Features
The G 15-25 utilizes a two-wheel drive configuration with a manual steering system. Power is transmitted through an unsynchronized gear transmission, which was typical for agricultural tractors of this era. The operator station is of the open type, providing the driver with basic controls and visibility required for field operation.
Dimensions and Build
With a total weight of 4,200 lbs (1,905 kg), the tractor is constructed as a standard-tread model. Its physical build reflects the engineering standards of the late 1920s, prioritizing structural durability for field work.
Conclusion
The Rock Island G 15-25 remains a notable example of American agricultural machinery from the late 1920s. Its combination of a Waukesha engine and a simple, robust mechanical layout makes it a representative model for those studying the evolution of early 20th-century farm power.
Production Information of Rock Island, G 15-25
- Standard-tread tractor
- Built in Rock Island, Illinois, USA
| Manufacturer | Rock Island |
|---|
Dimension and Tires Information of Rock Island, G 15-25
| Weight | 4,200 lbs [1905 kg] |
|---|
Engine Specifications of Rock Island, G 15-25
- Waukesha
- Liquid-cooled
- Kerosene
- 4-cylinder
| Displacement | 326 ci [5.3 L] |
|---|---|
| Bore/Stroke | 4.25x5.75 inches [108 x 146 mm] |
Transmission Information of Rock Island, G 15-25
Transmission variants 1
| Type | Unsynchronized gear |
|---|
Mechanical Specs of Rock Island, G 15-25
- Two-wheel drive
- Open operator station.
| Steering | Manual |
|---|
Power Information of Rock Island, G 15-25
| Drawbar (claimed) | 15 hp [11.2 kW] |
|---|---|
| Belt (claimed) | 25 hp [18.6 kW] |
Where it sits
Its power puts it in the 34th percentile of 1920s models in our database (181 machines).
Frequently asked questions
How much horsepower does the Rock Island G 15-25 have?
The Rock Island G 15-25 delivers 27 hp[B] HP.
What years was the Rock Island G 15-25 produced?
The Rock Island G 15-25 was produced in 1927-1928.
What engine does the Rock Island G 15-25 have?
The Rock Island G 15-25 is powered by a 4-cylinder engine.
What transmission does the Rock Island G 15-25 use?
The Rock Island G 15-25 uses a Unsynchronized gear transmission.
How much does the Rock Island G 15-25 weigh?
The Rock Island G 15-25 weighs 4,200 lbs [1905 kg].
Is the Rock Island G 15-25 4WD?
The Rock Island G 15-25 is available in 2WD.