The New Holland Fiat 45-66 and 45-66DT tractors were robust and versatile agricultural machines designed for a range of farming tasks. Manufactured by Fiat Trattori (later acquired by New Holland), these tractors were popular in Europe and other parts of the world, particularly during the 1970s and 1980s. The 45-66 boasted a powerful 3.9-liter, four-cylinder diesel engine that provided an output of 66 horsepower (49 kW). The 45-66DT variant was equipped with a 4-wheel drive system, enhancing its traction and maneuverability, especially in challenging terrain or during demanding operations. Both models were renowned for their durability, reliability, and ease of maintenance. They were known for their responsive hydraulic systems and comfortable operator cabins, designed to provide a safe and efficient work environment.

The New Holland Fiat 45-66 and 45-66DT tractors were designed for a wide range of tasks, including plowing, harrowing, cultivating, planting, and harvesting. Their versatility was further enhanced by a variety of optional attachments, such as front-end loaders, backhoes, and flail mowers. These tractors were also used for tasks like hauling trailers, transporting materials, and operating various implements. The 45-66 and 45-66DT models were popular choices for both small and medium-sized farms, as well as for landscaping and construction applications. Although production ceased several decades ago, these tractors continue to be used and appreciated for their reliability and capabilities. Their legacy is a testament to the quality and innovation that characterized Fiat Trattori and New Holland machines during that era.