Introduction
McCormick-Deering OS-4: Technical Overview
The McCormick-Deering OS-4 is a two-wheel-drive agricultural tractor produced by International Harvester between 1944 and 1953. Manufactured in Rock Island, Illinois, this model was designed as a utilitarian machine for general field operations, delivering 30 horsepower.
Engine and Performance
The tractor is powered by an International Harvester 4-cylinder, liquid-cooled gasoline engine with a displacement of 152.1 cubic inches (2.5 liters). It operates at a rated speed of 1650 RPM and features an oil bath air cleaner. The firing order is set to 1-3-4-2. The engine cooling system has a capacity of 17 quarts (16.1 liters), and the engine oil capacity is 6 quarts (5.7 liters).
Transmission and Drivetrain
Power is delivered to the ground via a gear-type transmission providing 5 forward speeds and 1 reverse gear. The transmission oil capacity is 24 quarts (22.7 liters). The machine utilizes a two-wheel-drive configuration and manual steering, consistent with the standard mechanical design of tractors from this era.
Dimensions and Hydraulics
The OS-4 has a wheelbase of 66.75 inches (169 cm) and an overall length of 120.875 inches (307 cm). With a shipping weight of 4120 lbs (1868 kg) and a front axle clearance of 15.125 inches (38 cm), the tractor provides stability for field work. It is equipped with 5.50-16 agricultural front tires and 12-26 agricultural rear tires. A rear PTO (Power Take-Off) operating at 540 RPM is included for implement compatibility.
Conclusion
The McCormick-Deering OS-4 is a representative example of mid-20th-century agricultural machinery. Its straightforward manual operation and 30-horsepower gasoline engine made it a versatile tool for small to medium-sized farming operations of the period. Today, it remains a notable model for collectors and enthusiasts of International Harvester history.
Production Information of McCormick-Deering, OS-4
- Built in Rock Island, Illinois, USA
| Manufacturer | McCormick-Deering |
|---|
Dimension and Tires Information of McCormick-Deering, OS-4
| Front tread | 45.875 inches [116 cm] |
|---|---|
| Wheelbase | 66.75 inches [169 cm] |
| Shipping weight | 4120 lbs [1868 kg] |
| Height | 57.125 inches [145 cm] |
| Length | 120.875 inches [307 cm] |
| Rear tread | 41.75 inches [106 cm] |
| Clearance (front axle) | 15.125 inches [38 cm] |
| Width | 55.5 inches [140 cm] |
| Ag front | 5.50-16 |
|---|---|
| Ag rear | 12-26 |
Engine Specifications of McCormick-Deering, OS-4
- International Harvester
- Liquid-cooled
- 4-cylinder
- Gasoline
| Compression | 5.9:1 (high-compression gasoline) |
|---|---|
| Rated RPM | 1650 |
| Displacement | 152.1 ci [2.5 L] |
| Bore/Stroke | 3.375x4.45 inches [86 x 113 mm] |
| Air cleaner | Oil bath |
| Air cleaner(optional) | 4.5:1 (kerosene) |
| Air cleaner(optional) | 4.75:1 (gasoline-distillate) |
| Coolant capacity | 17 qts [16.1 L] |
| Oil capacity | 6 qts [5.7 L] |
| Firing order | 1-3-4-2 |
Transmission Information of McCormick-Deering, OS-4
Transmission variants 1
| Type | Gear |
|---|---|
| Gears | 5 forward and 1 reverse |
| Oil capacity | 24 qts [22.7 L] |
Mechanical Specs of McCormick-Deering, OS-4
- Two-wheel drive
- Manual steering
- Open operator station.
Power Information of McCormick-Deering, OS-4
| Rear PTO Type | 540 |
|---|
Where it sits
With 30 hp[B] HP, the McCormick-Deering OS-4 sits between W-4 (27 HP) and 15-30 (33 HP) in McCormick-Deering's range. Its power puts it in the 43th percentile of 1940s models in our database (263 machines).
Frequently asked questions
How much horsepower does the McCormick-Deering OS-4 have?
The McCormick-Deering OS-4 delivers 30 hp[B] HP.
What years was the McCormick-Deering OS-4 produced?
The McCormick-Deering OS-4 was produced in 1944-1953.
What engine does the McCormick-Deering OS-4 have?
The McCormick-Deering OS-4 is powered by a Gasoline, 4-cylinder engine.
What transmission does the McCormick-Deering OS-4 use?
The McCormick-Deering OS-4 uses a Gear transmission.
How much does the McCormick-Deering OS-4 weigh?
The McCormick-Deering OS-4 weighs 4120 lbs [1868 kg].
Is the McCormick-Deering OS-4 4WD?
The McCormick-Deering OS-4 is available in 2WD.