This comprehensive service and repair manual provides detailed instructions for maintaining and servicing your IH International Harvester 1566, 1568, and 1586 Diesel Tractor. The manual is organized with clear diagrams and manufacturer specifications, making it easy to understand and follow. You'll find information on a wide range of topics, including: * **Brakes:** Learn how to inspect, adjust, and repair your tractor's braking system. * **Cab:** Discover how to maintain and troubleshoot the cab, including its components and systems. * **Clutch:** This section covers the clutch, including its operation, adjustments, and troubleshooting. * **Cooling System:** Find step-by-step guidance on maintaining and repairing the cooling system, including the radiator, fan, and thermostat. * **Diesel Fuel System:** This manual provides detailed instructions on servicing the fuel system, including the injectors, pump, and fuel lines. * **Diesel Turbocharger:** Learn how to diagnose and repair issues with the turbocharger. * **Differential:** The manual contains detailed instructions for maintaining and repairing the differential. * **Electrical System:** This section focuses on the electrical system, including the starter, alternator, and wiring diagrams. * **Engine:** This section provides in-depth information on the engine, covering its operation, maintenance, and troubleshooting. * **Final Drive:** Learn how to maintain and repair the final drive, which transfers power to the wheels. * **Front System:** This section covers the front axle, steering, and other components. * **Hydraulic System:** This manual provides comprehensive information on the hydraulic system, including its components, operation, and troubleshooting. * **Hydrostatic Drive:** Learn how to maintain and repair the hydrostatic drive system, if applicable to your tractor. * **Multiple Control Valve:** This section covers the multiple control valve, which allows you to operate multiple hydraulic functions. * **Power Steering System:** Learn how to maintain and troubleshoot the power steering system. * **Power Takeoff:** This section covers the power takeoff (PTO), which allows you to connect and operate implements. * **Service Data:** This section contains important service data, such as torque specifications and fluid capacities. * **Steering Gear:** Learn how to maintain and repair the steering gear. * **Torque Amplifier:** This section covers the torque amplifier, which increases torque output. * **Transmission, Brake:** This section focuses on the transmission and its braking system. * **Transmission Range:** Learn about the different transmission ranges and how to use them. * **Transmission Speed:** This section covers the transmission's different speed settings. With this manual, you'll have the information you need to keep your IH International Harvester 1566, 1568, or 1586 tractor running smoothly and efficiently.

## 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.