Power: 225 hp Date of manufacture : 1954 - 1965
Production Manufacturer: Allis Chalmers Type: Agricultural Crawler tractor Factory: Springfield, Illinois, USA Allis Chalmers HD21 Power Engine: 225 hp 167.8 kW Drawbar (tested): 135.12 hp 100.8 kW Allis Chalmers HD21 Engine Mechanical Chassis: crawler Brakes: contracting band Cab: Open operator station. Transmission: 2-speed torque converter Photos Allis Chalmers HD21 photos... Dimensions & Tracks Weight: 45500 lbs 20638 kg tracks Full dimensions and tracks ... HD21 Serial Numbers Location: Steering clutch housing or instrument panel

Allis Chalmers HD15	Power: 116 hp[B]	Date of manufacture : 1951 - 1955

Allis Chalmers HD16A	Power: 163 hp	Date of manufacture : 1955 - 1970

Allis Chalmers HD19	Power: 143 hp[B]	Date of manufacture : 1947 - 1950

Allis Chalmers HD20	Power: 175 hp	Date of manufacture : 1951 - 1954

Allis Chalmers HD21	Power: 225 hp	Date of manufacture : 1954 - 1965

Allis Chalmers T16	Power: 135 hp	Date of manufacture : 1963 - 1964

Allis Chalmers WD45	Power: 48 hp[B]	Date of manufacture : 1953 - 1957

B.F. Avery Louisville Motor Plow	Power: 22 hp[B]	Date of manufacture : 1916 - 1917