Allis Chalmers HD21

Name: Allis Chalmers HD21
Brand: Allis Chalmers

Power

225 hp

Production

1954-1965

Engine

Supercharged diesel, 6-cylinder

Transmission

Torque converter

Over 200 HP 1950s 1960s

Introduction

Allis-Chalmers HD21 Crawler Tractor

The Allis-Chalmers HD21 is a heavy-duty agricultural crawler tractor produced in Springfield, Illinois, USA, between 1954 and 1965. Designed for demanding field operations, this model is characterized by its significant mass and high-torque drivetrain.

Engine and Performance

The tractor is powered by a 6-cylinder, liquid-cooled, supercharged diesel engine with a displacement of 844 cubic inches (13.8 L). With a bore and stroke of 133 x 165 mm and a compression ratio of 13.3:1, the engine delivers 225 horsepower at a rated speed of 1800 RPM. An oil bath air cleaner is integrated to ensure engine longevity in dusty agricultural environments, and the cooling system has a capacity of 75.7 liters.

Transmission and Drivetrain

The HD21 utilizes a torque converter transmission, which provides smooth power delivery under load. The drivetrain offers two forward gears and one reverse gear, allowing for controlled maneuverability. The machine operates on a crawler track system, which provides the necessary traction for heavy-duty pulling and working on challenging terrain.

Mechanical and Physical Specifications

The tractor features an open operator station with contracting band brakes for stopping and steering control. With an operational weight of 45,500 lbs (20,638 kg), the machine is engineered for stability and high drawbar pull capabilities. The electrical system is supported by a 24-volt starter.

Conclusion

"The Allis-Chalmers HD21 is a specialized agricultural crawler tractor designed for heavy-duty traction tasks. Its combination of a high-displacement engine, torque converter transmission, and substantial track-based weight makes it suitable for intensive fieldwork and land preparation where high power and stability are required."

Introduction

Production Information of Allis Chalmers, HD21

The production information of the tractor (HD21) includes details about its manufacturing.

Agricultural Crawler tractor

Built in Springfield, Illinois, USA


Manufacturer	Allis Chalmers

Dimension and Tires Information of Allis Chalmers, HD21

This section sums up the dimension and tires information of the tractor.

No data available

Engine Specifications of Allis Chalmers, HD21

Get the specifications for the engine and if different options are available.

Allis-Chalmers

Liquid-cooled vertical I-head

Supercharged diesel

6-cylinder


Starter volts	24
Displacement	844 ci [13.8 L]
Air cleaner	Oil bath
Bore/Stroke	5.25x6.50 inches [133 x 165 mm]
Coolant capacity	80 qts [75.7 L]
Rated RPM	1800
Compression	13.3:1
Power	225 hp [167.8 kW]

Transmission Information of Allis Chalmers, HD21Y

Discover all variants of transmission available for this tractor model.

Transmission variants 1


Type	Torque converter
Gears	2 forward and 1 reverse

Mechanical Specs of Allis Chalmers, HD21Y

This section summarizes all mechanical information such as the brake system and other specifications.

Contracting band brakes

Open operator station.


Drive	Crawler

Power Information of Allis Chalmers, HD21Y

Discover the power specifications and options available for this tractor model but also PTO (Power Take-off) information.

Https://www.tractordata.com/farm-tractors/003/0/8/3083-allis-chalmers-hd21-tests.html

Frequently asked questions

How much horsepower does the Allis Chalmers HD21 have?

The Allis Chalmers HD21 delivers 225 HP.

What years was the Allis Chalmers HD21 produced?

The Allis Chalmers HD21 was produced in 1954-1965.

What engine does the Allis Chalmers HD21 have?

The Allis Chalmers HD21 is powered by a Supercharged diesel, 6-cylinder engine.

What transmission does the Allis Chalmers HD21 use?

The Allis Chalmers HD21 uses a Torque converter transmission.

More Allis Chalmers models

4W-220220 HP · 1982 - 1984 440218 HP · 1973 - 1977 7080210 HP · 1975 - 1981 7580206 HP · 1976 - 1981 7060192 HP · 1974 - 1981 8070189 HP · 1982 - 1985 HD20175 HP · 1951 - 1954 7045173 HP · 1978 - 1981

View all 94 Allis Chalmers models →

Compare the Allis Chalmers HD21 with another model

Popular comparisons

vs John Deere 4955 vs John Deere 7225J vs Massey Ferguson 4800 vs Massey Ferguson 7624 vs CaseIH Magnum 225 vs CaseIH Puma 225