The Oldest Tractor? Hart-Parr 22-45

Hart-Parr 22-45 owner marks the centennial of what may be the oldest purpose-built tractor in the U.S.

The 1906 Hart-Parr 22-45 was steered by chains. Note the corrugated fin radiator. The finned radiator is filled with thin oil. Exhaust pipes terminate in the center of the radiator, inducing a draft.