Kenworth was formed in 1923 when Harry Kent and Edgar Worthington gave their Seattle truck business its combined name. The company built a reputation for custom-engineered heavy trucks, joined PACCAR in 1945, and today assembles trucks in Renton, Washington, Chillicothe, Ohio and other plants as PACCAR's premium North American marque alongside Peterbilt.

Kenworth is known for the W900 conventional, a long-running symbol of owner-operator trucking, and for pioneering aerodynamic design with the T600 of the mid-1980s. The modern T680 handles long-haul duty, the T880 serves construction and vocational work, and the C500 covers severe off-road hauls. Comfortable sleepers, strong resale values and driver-focused cabs define the brand. The T680 is also offered with natural-gas engines from Cummins Westport for fleets seeking lower emissions.

Kenworth workshop manuals cover Cummins and PACCAR engines, Eaton Fuller and automated transmissions, drive axles and differentials, air-brake systems with ABS, suspensions from multi-leaf springs to the AG400 air-ride, steering, HVAC and complete chassis wiring diagrams. Diagnostic procedures, torque specifications and lubrication and maintenance schedules are included for each model.

Owner-operators take pride in maintaining their own trucks, and independent shops service Kenworths across North America, so factory documentation is in constant demand. Fleet maintenance departments also use these manuals to standardise repairs across mixed fleets. Because Kenworth builds trucks to order, specifications vary widely, so matching the manual to the exact chassis matters.