Allis Chalmers HD20
Power
175 hp
Production
1951-1954
Engine
Blower diesel, 6-cylinder
Transmission
Torque converter
Introduction
Allis Chalmers HD20 Crawler Tractor
The Allis Chalmers HD20 is an agricultural crawler tractor produced between 1951 and 1954 in Springfield, Illinois, USA. Designed for heavy-duty earthmoving and agricultural operations, this model represents a significant engineering effort of its era, with 3,100 units manufactured in total.
Engine and Performance
The tractor is powered by a General Motors liquid-cooled, 2-cycle vertical I-head diesel engine. This 6-cylinder unit features a displacement of 660 cubic inches (10.8 liters) and a bore/stroke ratio of 5.00x5.60 inches. It delivers a net power output of 175 hp (130.5 kW) at a rated speed of 1700 RPM. The engine utilizes a compression ratio of 18.0:1 and requires a 24-volt electrical starter system.
Transmission and Drivetrain
The HD20 is equipped with a torque converter transmission system. This configuration provides two forward gears and one reverse gear, allowing for efficient power transfer to the tracks. The crawler drive system is specifically engineered to provide high traction and stability on uneven or soft agricultural surfaces.
Dimensions and Operator Environment
With an operating weight of 41,000 lbs (18,597 kg), the tractor is designed to provide substantial ballast for heavy pulling tasks. The operator station is of an open design, prioritizing visibility and access to controls during field operations.
Conclusion
The Allis Chalmers HD20 is a heavy-duty crawler tractor built for demanding agricultural and land-clearing applications. Its combination of a high-torque diesel engine and a torque converter transmission makes it suitable for tasks requiring consistent power delivery and significant tractive effort.
Production Information of Allis Chalmers, HD20
- Agricultural Crawler tractor
- Built in Springfield, Illinois, USA
| Manufacturer | Allis Chalmers |
|---|---|
| Total built | 3,100 |
Engine Specifications of Allis Chalmers, HD20
- General Motors
- Liquid-cooled 2-cycle vertical I-head
- Blower diesel
- 6-cylinder
| Coolant capacity | 60 qts [56.8 L] |
|---|---|
| Displacement | 660 ci [10.8 L] |
| Compression | 18.0:1 |
| Bore/Stroke | 5.00x5.60 inches [127 x 142 mm] |
| Starter volts | 24 |
| Rated RPM | 1700 |
| Power (net) | 175 hp [130.5 kW] |
Transmission Information of Allis Chalmers, HD20
Transmission variants 1
| Type | Torque converter |
|---|---|
| Gears | 2 forward and 1 reverse |
Mechanical Specs of Allis Chalmers, HD20
- Open operator station.
| Drive | Crawler |
|---|
Power Information of Allis Chalmers, HD20
- Https://www.tractordata.com/farm-tractors/003/0/8/3081-allis-chalmers-hd20-tests.html
Where it sits
With 175 HP, the Allis Chalmers HD20 sits between 7050 (173 HP) and 8070 (189 HP) in Allis Chalmers's range. Its power puts it in the 99th percentile of 1950s models in our database (592 machines).
Frequently asked questions
How much horsepower does the Allis Chalmers HD20 have?
The Allis Chalmers HD20 delivers 175 HP.
What years was the Allis Chalmers HD20 produced?
The Allis Chalmers HD20 was produced in 1951-1954.
What engine does the Allis Chalmers HD20 have?
The Allis Chalmers HD20 is powered by a Blower diesel, 6-cylinder engine.
What transmission does the Allis Chalmers HD20 use?
The Allis Chalmers HD20 uses a Torque converter transmission.