The origins of the Haulpak line began with the purchase of
R. G. LeTourneau's construction machinery business in 1953 by
Westinghouse Air Brake Company. Wabco had traditionally been a manufacturer of
railway air brake systems, but ventured into
construction machinery with the purchase of LeRoi air tools and industrial drills in 1952. The subsequent purchase of R. G. LeTourneau's construction machinery line gave Wabco a comprehensive range of machinery including scrapers, rubber-tyred
dozers and other attachments. Wabco subsequently added
motor graders to their product line by purchasing
J. D. Adams in 1955 and thereafter front end loaders, with the purchase of Scoopmobile. Wabco recognised the importance of the off-highway Truck market and hired
Ralph H. Kress to design a line of haul trucks in-house. Kress incorporated many new design features which were trend setting and eventually
Caterpillar was to offer him a position designing their range of haulers. The Haulpak line of mining and quarry trucks was the best-performing sector for Wabco for the entire time they owned it and eventually the scrapers, wheel dozers, graders and front end loaders would be discontinued from the Wabco catalogue. In 1968 Wabco had become part of
American Standard Company (known for bathroom fittings) and then it would become part of
Dresser Industries in 1984. After a
Komatsu Limited-Dresser joint venture (KDC) in 1988 was formed, the Haulpak truck line was again (partly) under new ownership, although by 1994 Komatsu had purchased all remaining shares of KDC, making it a wholly owned subsidiary. The Haulpak name was quietly discontinued around 1998–1999 and the new trucks were then known as Komatsu machines. While the smaller Komatsu haul trucks are distinctly Japanese in design, the current line of larger trucks can trace their heritage back to American Haulpak design roots. == Truck models ==