This comprehensive workshop repair service manual provides detailed information for maintaining and troubleshooting your IH International Harvester 674. It covers all models, engines, trim levels, and transmissions, offering you the same high-quality technical information used by professional service shops. This manual is complete and intact, ensuring you have access to all the necessary information without any missing or corrupt pages. The manual offers hundreds of pages of diagrams and detailed information for specific vehicle repairs, including everything from basic maintenance to complex troubleshooting. Written by the manufacturer, this original workshop manual provides the most accurate and comprehensive information available. The manual includes pictures and easy-to-follow instructions, guiding you through each repair step-by-step. With this manual, you can save hundreds, if not thousands of dollars on repair bills by performing simple maintenance and repairs yourself. The manual also acts as a valuable resource for future reference, allowing you to be prepared for any necessary maintenance down the line. This manual covers a wide range of topics, including: * Engine: Provides comprehensive information on engine maintenance, troubleshooting, and repair. * Lubrication System: Covers the lubrication system, including oil changes, filter replacements, and system diagnosis. * Cooling System: Details on the cooling system, including radiator maintenance, coolant changes, and troubleshooting. * Fuel System: Covers the fuel system, including fuel lines, filters, injectors, and pump repairs. * Disassembly and Servicing: Provides detailed guidance on disassembling, servicing, and reassembling various components. * General: Includes general maintenance procedures and tips. * Separation: Covers the separation process for specific components. * Clutch: Provides information on clutch maintenance, inspection, and repair. * Transmission: Details on the transmission system, including gear changes, troubleshooting, and repair. * Drive Chain and Sprockets: Covers the drive chain and sprockets, including maintenance, lubrication, and replacement. * Rear Axle: Provides information on the rear axle, including differentials, bearings, and repair procedures. * Brakes: Covers the brake system, including brake adjustments, repairs, and troubleshooting. * Front Axle: Details on the front axle, including steering components and repair procedures. * Steering: Covers the steering system, including adjustments, repairs, and troubleshooting. * Shocks: Provides information on shock absorbers, including inspection, replacement, and maintenance. * Body Work: Details on bodywork repairs, including panels, doors, and other components. * Intake and Exhaust: Covers the intake and exhaust systems, including repairs and maintenance. * Hydraulic System: Provides information on the hydraulic system, including maintenance, troubleshooting, and repair. * Electrical System: Details on the electrical system, including wiring diagrams, troubleshooting, and repairs. * Routine Maintenance: Covers routine maintenance procedures for your IH International Harvester 674. * Advanced Troubleshooting: Provides guidance on advanced troubleshooting techniques for complex issues. * Wiring Diagram: Includes detailed wiring diagrams for the electrical system, making it easier to diagnose and repair electrical problems. This manual is your one-stop resource for maintaining and repairing your IH International Harvester 674. With detailed instructions, illustrations, and thorough coverage of all major components, you'll have the confidence to tackle any repair project.

The International Harvester 674, affectionately known as the "674", was a highly successful semi-truck model produced by International Harvester from 1978 to 1985. This workhorse truck was known for its durability, reliability, and power, making it a popular choice for long-haul trucking and heavy-duty applications. The 674 was available with a range of powerful diesel engines, including the Cummins NTC-350, the Cummins NTC-370, and the International DT466. These engines were coupled with robust transmissions, such as the Fuller RT-915 and RT-1050, ensuring smooth power delivery and efficient operation. The 674 featured a distinctive design with a long, aerodynamic hood and a spacious cab, offering a comfortable working environment for drivers. The International Harvester 674 was a technological advancement in its time, incorporating features that improved safety, efficiency, and maintenance. It included a comprehensive suite of safety features, such as power steering, power brakes, and a durable frame, ensuring driver safety and stability on the road. The 674 also featured a well-organized layout, making it easy for maintenance personnel to access components for inspections and repairs. This truck was renowned for its ability to handle heavy loads over long distances, making it an essential tool for the transportation industry. The 674's legacy lives on in the hearts of truck enthusiasts and those who relied on its unwavering performance to keep goods moving across the nation. Though the production of the 674 ended in 1985, its impact on the trucking industry continues to be felt today, with many still operating on our roads after decades of faithful service.