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Allis Chalmers HD-21
Allis Chalmers HD-21 — Industrial Crawler tractor · 268 hp. Reference specifications; pending source verification.
The Allis Chalmers HD-21 is a high-powered industrial tractor with a rated output of 268 hp, making it a notable machine in its class. Manufactured from 1967 to 1969, this model features a 6-cylinder turbocharged diesel liquid-cooled engine. The engine drives a tracked undercarriage, which is equipped with a powershift transmission. The listed weight of the HD-21 is 22680 kg, and it is designed for use on large areas of around 1,500 acres or more.
Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.
Catalogue coverage
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Overview
Engine
Transmission
Dimensions
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.
Handy kit for owners
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Turn tight corners one-handed — fits tractors, mowers, and forklifts.
Carry your saw safely and skip the trip back to the shed.
Pulls equipment out of mud, snow, or a ditch — 20 ft reach.
Keeps your phone mounted and visible through every bump.