Tractor · 1954Unverified
Allis Chalmers HD21
Allis Chalmers HD21 — Model year 1954-19581958-1965 · 225 hp. Reference specifications; pending source verification.
Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.
Rated power
225 hp
Max power
100.8 kW
Weight
20638 kg
Hover a source tag to verify
Overview
ManufacturerAllis ChalmersReference
Agricultural Crawler tractorReference
Built in Springfield, Illinois, USAReference
DrivecrawlerReference
Contracting band brakesReference
Open operator station.Reference
Engine
Allis-Chalmers 13.8L 6-cyl dieselReference
Fuel tank511.0 LReference
Engine167.8 kWReference
Drawbar (tested)100.8 kWReference
Allis-ChalmersReference
supercharged dieselReference
6-cylinderReference
liquid-cooled vertical I-headReference
Displacement13.8 LReference
Bore/Stroke133 x 165 mmReference
Power167.8 kWReference
Air cleaneroil bathReference
Compression13.3:1Reference
Rated RPM1800Reference
Starter volts24Reference
Coolant capacity75.7 LReference
Max power100.8 kWReference
Transmission
2-speed torque converterReference
Typetorque converterReference
Gears2 forward and 1 reverseReference
Dimensions
Weight20638 kgReference
TracksReference
Length502 cmReference
Height251 cmReference
HD21 Serial Numbers
Location:Steering clutch housing or instrument panelReference
Test results
Diesel 2-speed crawlerJuly 6 - 18, 1955Link: Nebraska Tractor Test 550 fileReference
Drawbar performanceReference
Max pull18399 kgReference
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.