This comprehensive service repair manual provides detailed instructions for maintaining and servicing your IH International Harvester 1566, 1568, and 1586 Diesel tractors. The manual includes diagrams and manufacturer specifications, ensuring accurate and efficient repair procedures. It covers a wide range of components and systems, from basic maintenance to complex repairs, making it an indispensable resource for both experienced mechanics and DIY enthusiasts. The manual’s organized structure and clear presentation make it easy to navigate. You can quickly locate the specific information you need using the comprehensive index and bookmarks. Detailed diagrams and step-by-step instructions, along with technical specifications, ensure you have everything you need to perform repairs confidently. The manual covers essential topics such as: * **Brakes:** Learn about the brake system, including adjustments, repairs, and troubleshooting. * **Cab:** Find information on the cab’s components, including the interior, windows, and doors. * **Clutch:** Get detailed instructions on clutch operation, adjustments, and repair procedures. * **Cooling System:** Understand the cooling system’s components, maintenance procedures, and troubleshooting tips. * **Diesel Fuel System:** Explore the diesel fuel system, including fuel injection, filtration, and system troubleshooting. * **Diesel Turbocharger:** Learn about the turbocharger’s operation, maintenance, and potential issues. * **Differential:** Find detailed information on the differential’s components, operation, and repair procedures. * **Electrical System:** Gain a comprehensive understanding of the electrical system, including wiring diagrams, troubleshooting, and repair tips. * **Engine:** Explore the engine’s components, operation, and maintenance procedures, covering everything from oil changes to major overhauls. * **Final Drive:** Understand the final drive system, including its components, operation, and potential issues. * **Front System:** Learn about the front axle, steering, and other front system components, including maintenance and repair procedures. * **Hydraulic System:** Gain knowledge about the hydraulic system, including its components, operation, and troubleshooting techniques. * **Hydrostatic Drive:** This manual provides an in-depth explanation of the hydrostatic drive system, its components, and maintenance requirements. * **Multiple Control Valve:** Learn about the multiple control valve’s operation, maintenance, and troubleshooting tips. * **Power Steering System:** Explore the power steering system, including its components, operation, and potential issues. * **Power Takeoff:** Gain insights into the power takeoff system, including its components, operation, and maintenance procedures. * **Service Data:** Find essential specifications, tables, and charts for various components and systems. * **Steering Gear:** Learn about the steering gear’s function, operation, and potential issues. * **Torque Amplifier:** Gain an understanding of the torque amplifier's operation, maintenance, and troubleshooting techniques. * **Transmission, Brake:** Explore the transmission brake system, its components, and repair procedures. * **Transmission Range:** Learn about the transmission ranges and how to select the appropriate range for your work. * **Transmission Speed:** Get comprehensive information on the transmission speed, including its operation and adjustment procedures. This manual empowers you to diagnose and repair your IH International Harvester 1566, 1568, and 1586 tractors efficiently and confidently.

## The IH International Harvester 1566, 1568, and 1586: Workhorses of the Field The International Harvester 1566, 1568, and 1586 tractors, produced from 1977 to 1985, were renowned for their power, durability, and versatility. These models were part of the "1500" series, which marked a shift towards larger, more powerful tractors designed for heavy-duty agricultural work. These machines were equipped with powerful diesel engines, featuring either the 6-cylinder International D-359, the 6-cylinder International DT-360, or the 6-cylinder International DT-466. These engines, with their high torque output, enabled the 1500 series to tackle demanding tasks with ease, making them popular choices for large-scale farming operations. The 1566, 1568, and 1586 were available with a range of transmissions, offering various gear ratios and speeds to match different terrains and tasks. This flexibility, combined with their robust construction, ensured these tractors could handle everything from plowing and cultivating to hauling heavy loads and operating demanding implements. The IH 1500 series was designed with operator comfort and convenience in mind. The spacious cabs offered ample legroom and visibility, while features like air conditioning, heating, and soundproofing enhanced the driver's experience. The controls were ergonomically designed for ease of use, minimizing operator fatigue during long working hours. The 1566, 1568, and 1586 were true workhorses, built to withstand the rigors of demanding agricultural work. Their rugged construction, powerful engines, and versatile transmissions made them invaluable assets to farmers and ranchers across the globe. These models have earned a reputation for reliability and longevity, with many still in use today, often exceeding their original service life. Despite their age, these tractors remain popular, with enthusiasts and collectors recognizing their significance in agricultural history and their continued ability to perform demanding tasks.