The International Harvester 986 Tractor, produced circa 1976-1981, represents a robust and reliable workhorse in the agricultural sector. As part of the esteemed IH '86 series, this tractor was designed for demanding farm operations, offering significant power and versatility. It typically features a powerful International Harvester DT-466 diesel engine, delivering approximately 100-115 PTO horsepower, and a manual synchromesh transmission with power steering for enhanced maneuverability. Its engineering quality and durability have made it a respected machine, well-suited for heavy draft work and a wide range of agricultural tasks. This comprehensive full service repair manual is an essential resource for maintaining and repairing the International Harvester 986 Tractor. It covers all major systems, including the engine, transmission, electrical system, hydraulics, drivetrain, chassis, and operator controls, providing detailed diagnostics, repair, rebuilding, and restoration procedures. The manual is structured with numbered, step-by-step instructions, detailed illustrations, and integrated safety information, making it suitable for professional technicians and experienced mechanics. It is presented in English and ensures accessibility and ease of use for all maintenance and repair needs. 🏷️ Basic Information Identification Make: International Harvester Model: 986 Tractor Product Type: Full Service Repair Manual 👋 Introduction Market Position Segment: Agricultural Tractors (Heavy Duty) Competitive Analysis Comparison Point: Essential resource for owners and technicians seeking comprehensive maintenance and repair guidance for the IH 986. Key Features Diagnostic Tools: Integrated troubleshooting and electrical service procedures with wiring diagrams. Illustration Quality: Detailed illustrations, drawings, and photos with enlarged insets for part examination. Instruction Format: Numbered, step-by-step instructions with bold figure numbers for easy referencing. Content Structure: Numbered table of contents for quick information retrieval. Safety Information: Notes, cautions, and warnings integrated throughout repair procedures. 📋 Manual Details Coverage Areas Primary Coverage: International Harvester 986 Tractor Page Count Estimated Pages: Extensive (specific count not provided, but described as 'very detailed' and 'full service') Manual Type Type: Full Service Repair Manual Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered Engine: Comprehensive diagnostics, repair, and rebuild procedures for the engine. Transmission: Detailed coverage of transmission repair and maintenance. Electrical System: Includes troubleshooting, service procedures, and detailed wiring diagrams. Hydraulics: Implied coverage through general repair and diagnostic procedures. Drivetrain: Coverage of components related to power transfer. Chassis And Frame: Procedures for structural components and associated systems. Operator Controls: Maintenance and repair of control systems. Pto And Hitch: Likely covered within general repair and maintenance sections. Procedures Included Maintenance: Comprehensive service schedules and maintenance procedures. Repair: Detailed step-by-step repair instructions for all major components. Rebuilding: In-depth procedures for component rebuilding, including engine and transmission. Refurbishment: Guidance on restoring components and the tractor's overall condition. Restoration: Comprehensive support for full restoration projects. Diagnostics: Extensive troubleshooting and diagnostic procedures for all systems. Technical Depth Target Audience: Professional technicians and experienced DIY mechanics. Depth Of Coverage: Covers everything from basic maintenance to complete engine and transmission rebuilds, with detailed diagnostic procedures. 📊 Manual Specifications File Format Format: PDF Print Quality Printability: Full Printable (all pages) Binding Type Binding: Digital (downloadable, can be printed and bound) Paper Type Paper Type: N/A (Digital format) Compatibility Operating Systems: All Versions of Windows & Mac Requirements Software: Adobe PDF Reader & WinRAR ⚙️ Engine Specifications Primary Engine Engine Model Likely: International Harvester DT-466 (or similar variant) Engine Type: Diesel, turbocharged (likely) Performance Horsepower Estimated: Approx. 100-115 PTO HP (varies by specific configuration) Torque Estimated: Significant torque output for heavy draft work (specific figures vary). Fuel System Fuel Type: Diesel Injection System: Bosch inline injection pump (typical for this era and engine). Cooling System Cooling Type: Liquid-cooled 🔧 Transmission Standard Transmission Type: Manual Synchromesh with Power Steering (e.g., 16-speed) Optional Power Shift: Not a standard feature on the 986, but the manual would detail any related systems. Features Gear Selection: Multiple forward and reverse gears for versatile operation. 📐 Dimensions Exterior Wheelbase: Approx. 94.5 inches (2400 mm) Weights Operating Weight: Approx. 9,000 - 10,000 lbs (4080 - 4535 kg) depending on configuration. 🛡️ Safety Features Ratings Safety Features: Roll Over Protective Structure (ROPS) availability, seat belts, operator presence lever (safety interlock). Active Features Braking System: Hydraulic disc brakes. 💡 Technology Features Infotainment Audio System: Basic AM/FM radio (optional, typically not integrated in the same way as modern vehicles). Driver Assistance Power Steering: Standard power steering for improved maneuverability. Connectivity Lighting: Work lights and road lights (depending on configuration). 🔧 Maintenance Service Intervals Engine Oil Change: Typically every 250 hours (refer to manual for specific recommendation). Fuel Filter Replacement: Regular replacement as per manual, often tied to hours or fuel quality. Hydraulic Fluid Change: Typically annually or every 500-1000 hours (refer to manual). Fluid Specifications Engine Oil Type: API CD or CE rated diesel engine oil (e.g., SAE 15W-40 or 10W-30 depending on climate). Hydraulic Fluid Type: IH Hy-Tran Plus or equivalent UTF (Universal Tractor Transmission Fluid) meeting...