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Allis Chalmers HD21

Allis Chalmers HD21 tractor
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The Allis Chalmers HD21 is an agricultural crawler tractor produced from 1954 to 1965. It features a powerful 13.8L 6-cylinder supercharged diesel engine delivering 225 hp, coupled with a 2-speed torque converter transmission. Built in Springfield, Illinois, USA, the HD21 is designed for heavy-duty farming tasks with a crawler drive, contracting band brakes, and an open operator station. It weighs 45,500 lbs and measures 198 inches in length and 99 inches in height. The tractor's fuel tank capacity is 135 gallons, and it has a coolant capacity of 80 quarts. The HD21 is known for its robust construction and reliable performance in agricultural applications.
Allis Chalmers HD21tractorcrawler tractor225 hp13.8L diesel enginetorque converter transmissionagricultural tractortractor specifications
Power225 hp
Founded1954 - 1965
ModelHD21

Technical Specifications

Detailed specifications and technical data for Allis Chalmers HD21

Power

Engine:225 hp (167.8 kW)
Drawbar (tested):135.12 hp (100.8 kW)

Engine

Type:supercharged diesel
Model:Allis-Chalmers 13.8L 6-cyl diesel
Power:225 hp (167.8 kW)
Cooling:liquid-cooled vertical I-head
Cylinders:6-cylinder
Fuel tank:135 gal (511.0 L)
Rated RPM:1800
Air cleaner:oil bath
Bore/Stroke:5.25x6.50 inches (133 x 165 mm)
Compression:13.3:1
Displacement:844 ci (13.8 L)
Starter volts:24
Coolant capacity:80 qts (75.7 L)

Dimensions

Height:99 inches (251 cm)
Length:198 inches (502 cm)
Weight:45500 lbs (20638 kg)

Mechanical

Drive:crawler
Brakes:Contracting band brakes
Operator station:Open operator station.

Production

Type:Agricultural Crawler tractor
Built in:Springfield, Illinois, USA
Years made:1954 - 1965
Manufacturer:Allis Chalmers

References

Reference:Engineering-in-Action published in 1956, by Allis Chalmers

Transmission

Type:torque converter
Gears:2 forward and 1 reverse
Speeds:2-speed torque converter

HD21 Serial Numbers

Location:Steering clutch housing or instrument panel