The International Harvester BTD-6 Crawler Tractor, produced between 1955 and 1965, represents a robust and versatile machine designed for demanding applications in construction, agriculture, landscaping, forestry, and industrial tasks. Renowned for its durability and reliability, the BTD-6 offers significant drawbar pull within its compact crawler tractor segment, making it a capable workhorse. Its engineering prioritizes a straightforward, dependable design, featuring a 4-cylinder International Harvester BD-6 diesel engine and a manual synchromesh transmission with typically five forward and one reverse gear. The BTD-6's versatility is further enhanced by its independent rear power take-off and hydraulic system, allowing for the use of a wide range of attachments.

This comprehensive service manual provides essential information for the maintenance, repair, and overhaul of the International Harvester BTD-6 Crawler Tractor. It covers all major systems, including the engine, fuel, cooling, lubrication, electrical, transmission, drive, hydraulic, steering, and braking systems. Detailed procedures for routine maintenance, component adjustments, troubleshooting common issues, and complete repair and overhaul are included. Technical specifications, torque values, fluid requirements, and special tool recommendations are also provided to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of their BTD-6.