Power: 175 hp Date of manufacture : 1951 - 1954
Production Manufacturer: Allis Chalmers Type: Agricultural Crawler tractor Factory: Springfield, Illinois, USA Total built: 3,100 Allis Chalmers HD20 Power Engine (net): 175 hp 130.5 kW Drawbar (claimed): 117 hp 87.2 kW Drawbar (tested): 116.7 hp 87.0 kW Allis Chalmers HD20 Engine Mechanical Chassis: crawler Cab: Open operator station. Transmission: 2-speed torque converter Dimensions & Tracks Weight: 41000 lbs 18597 kg tracks Full dimensions and tracks ... HD20 Serial Numbers Location: Steering clutch housing or instrument panel 1951: 3001 1952: 3828 1953: 4923 1954: 5737 how to read serial numbers...

Allis Chalmers HD14	Power: 161 hp[B]	Date of manufacture : 1939 - 1947

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