This comprehensive workshop manual provides in-depth information and detailed procedures for servicing and repairing Freightliner Columbia CL112 and CL120 trucks. The manual covers a wide range of components, systems, and subsystems, including the Detroit Diesel Series 60 engine, ISM EPA07 engine, Caterpillar C-10 diesel engine, Bendix Series 550 and 750 brakes, Eaton Fuller Ultrashift, Ultrashift Plus, and Autoshift transmissions, ZF Meritor Freedomline and Meritor Sureshift transmissions, and many more.

The manual is meticulously organized, offering clear and concise instructions accompanied by detailed diagrams and illustrations. It includes sections covering general information, service information, maintenance schedules, tightening torques, special service tools, noise, vibration, and harshness analysis, engine systems, air intake and compressor systems, alternators and starters, engine cooling, radiators, clutch systems, transmission, throttle control, frame and frame components, suspension systems, front axles, transmission shift control, trailer coupling, wheel hubs, brake drums, wheel bearings, antilock braking system (ABS), steering driveline, tilt steering column, airbag system, exhaust system, lighting system, power distribution module, instrumentation control, communications system, collision warning system, seat belts and sleeper compartment, Rolltek rollover protection system, rear axles, wheels and tires, driveline systems, brake systems, steering systems, fuel systems, exhaust systems, electrical and controls, cab and doors, windshield wipers and washer, heater and air conditioner, hood, grille, and cab fenders, seats and restraint systems, painting systems, troubleshooting, and circuit diagrams.

The Freightliner Columbia CL112 and CL120 are heavy-duty trucks designed for long-haul and regional transportation applications. Introduced in 2001, the Columbia series became a staple in the Freightliner lineup, known for its aerodynamic design, comfortable driver environment, and powerful engine options. These trucks are distinguished by their iconic "Columbia" grille, featuring a large, chrome-plated Freightliner emblem, and a sloped hood that enhances fuel efficiency. The CL112 and CL120 share the same basic chassis, with the CL120 offering a higher gross vehicle weight rating (GVWR) and a wider range of engine and transmission options. Both models come equipped with a spacious cab designed for driver comfort, featuring adjustable seats, ample storage space, and a user-friendly dashboard.

Powering the Columbia CL112 and CL120 are a variety of Cummins ISX and CAT C15 engines, offering horsepower ratings from 400 to 600 hp. These powerful engines are paired with Eaton Fuller automated manual transmissions, providing seamless gear changes and optimal fuel economy. The Columbia series incorporates advanced safety features such as Electronic Stability Program (ESP), Lane Departure Warning (LDW), and Adaptive Cruise Control (ACC), enhancing driver safety and reducing the risk of accidents. With its durable construction, efficient performance, and advanced safety features, the Freightliner Columbia CL112 and CL120 remain a popular choice for trucking fleets and owner-operators across North America.