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July 23, 2024

Vintage Photographs of Mack Logging Trucks From the 1920s

Mack AC “Bulldog” haulers are legendary workhorses. During their 20-plus years of production (1916-1938), they were employed in many heavy industries including logging, petroleum, construction, and nearly anywhere a rock-solid chassis cab was needed. They were available with up to a 7.5-ton load capacity. The U.S. military made extensive use of the AC during WWI. Many of them remained in the countries where they served and were put to use by civilians for decades afterward.

Mack introduced the AC model in 1916 to replace their Mack Senior model which dated from 1905. Mack’s chief engineer, Edward Hewitt, is credited with designing the AC which on its introduction was so innovative it had 18 patents on various aspects of its design. When introduced, the AC complimented the smaller AB, another Hewitt design, that was introduced in 1914 to replace Mack’s older Junior model.

The AC proved to be an extremely enduring model for Mack and it remained in production until 1938, with a total of 40,299 produced. The AC was widely used in construction and road-building, with many used in the construction of the Hoover Dam. The AC was among the strongest trucks ever made, and solid-tire ACs built in the 1920s were still a common sight in American cities in the 1950s, and not unknown in the 1960s. The AC’s chassis, along with that of the AP, was a popular choice for fire engines, in both rigid and articulated forms.










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