Power: 0 Date of manufacture : 1955 - 1957
Production Manufacturer: ATC (a part of J.I. Case) Type: Agricultural Crawler tractor Factory: Churubusco, Indiana, USA ATC 556 Power ATC 556 Engines Mechanical Chassis: crawler Cab: Open operator station. Transmission: 3-speed torque converter Dimensions & Tracks tracks Full dimensions and tracks ... 556 Serial Numbers 1955: 556-001 (gas) 1956: 556-177 (gas) 1957: 556-354 (gas) Final: 556-378 (gas) 1955: D556-001 (diesel) 1956: D556-029 (diesel) 1957: D556-096 (diesel) Final: D556-098 (diesel) how to read serial numbers...

ATC 356	Power: 36 hp	Date of manufacture : 1955 - 1956

ATC 400	Power: 42 hp	Date of manufacture : 1954 - 1955

ATC 456	Power: 42 hp	Date of manufacture : 1955 - 1956

ATC 500	Power: 50 hp	Date of manufacture : 1954 - 1955

ATC 556	Power: 0	Date of manufacture : 1955 - 1957

ATC 656	Power: 62 hp	Date of manufacture : 1955 - 1957

ATC DT-34	Power: 31 hp	Date of manufacture : 1952 - 1954

ATC GT-25	Power: 25 hp	Date of manufacture : 1950 - 1953

ATC GT-28	Power: 0	Date of manufacture : 1953 - 1954