This Operator Owner Manual provides comprehensive guidance for the truck, a Class 8 heavy-duty conventional truck designed for long-haul trucking and vocational applications. Introduced around 1999 and produced until approximately 2011/2012, the 387 replaced the 377 with a focus on aerodynamic enhancements, driver comfort, and efficiency. It typically features powerful diesel engines from manufacturers like Cummins or Detroit Diesel, paired with manual or automatic transmissions, and is built to meet rigorous safety standards. The truck is recognized for its quality engineering and driver-centric design, offering a spacious cab and robust performance for demanding professional use.

This manual is intended to assist owners and operators in understanding and maintaining their truck. It covers essential areas such as vehicle identification, operating procedures, driver checklists, and basic maintenance. Key topics include cab and frame access, controls and displays, seat and restraint systems, starting and operating the vehicle, and consumer information. While it details operator-level checks like fluid levels and visual inspections, it does not serve as a full service or repair manual, focusing instead on safe operation and the identification of potential issues through dashboard indicators. The manual's structure, including a subject index, ensures efficient access to information for routine care and operational knowledge.