The International Harvester 986 Tractor, produced between 1977 and 1981, represents a robust and reliable heavy-duty agricultural machine. Built upon the legacy of International Harvester's commitment to quality agricultural equipment, the 986 is powered by a 466 cubic inch (7.6 liter) International Harvester DT-466 diesel engine, delivering approximately 110-120 PTO horsepower. It features a 16-speed Power Shift transmission, known for its electro-hydraulic control for on-the-go shifting, and a substantial operating weight designed for demanding tasks. This tractor embodies the functional engineering characteristic of its era, focusing on durability and performance for agricultural applications. This comprehensive Factory Service Repair Manual provides detailed information for the service, repair, and maintenance of the International Harvester 986 Tractor. It covers all major systems, including the engine, transmission, hydraulics, electrical system, fuel system, cooling system, brakes, steering, powertrain, chassis, and operator station. The manual includes step-by-step repair procedures, diagnostic guides, rebuild instructions, maintenance schedules, wiring diagrams, torque specifications, and system schematics. Its factory-level depth is intended for professional technicians and experienced owners, enabling efficient troubleshooting and ensuring the longevity and optimal performance of the tractor. 🏷️ Basic Information Identification Make: International Harvester Model: 986 Tractor Product Name: International Harvester 986 Tractor Factory Service Repair Manual Codes Product Type: Factory Service Repair Manual 👋 Introduction Market Position Segment: Heavy-duty agricultural tractor Key Features Convenience: Easy downloading and immediate access for repairs Cost Savings: Enables significant cost savings on repairs by empowering self-service Knowledge Acquisition: Provides in-depth vehicle knowledge for emergencies and routine maintenance Accessibility: Repair anytime, anywhere, on any compatible device Information Layout: Well-organized with a table of contents for easy navigation 📋 Manual Details Coverage Areas Primary Coverage: Service, repair, and maintenance of the International Harvester 986 Tractor Specific Components: Engine, transmission, hydraulics, electrical system, steering, brakes, PTO, hitch, front axle, final drives, operator station. Page Count Estimated Page Count: Extensive (specific page count not provided in source, but implied by 'comprehensive' and detailed coverage) Manual Type Type: Factory Service Repair Manual / Workshop Manual / Troubleshooting Guide Purpose: A comprehensive guide for diagnosing, repairing, and maintaining the International Harvester 986 Tractor. Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine: Detailed repair, diagnostics, and overhaul of the engine systems Transmission: Service and repair of the transmission, including clutch and gearbox Hydraulics: Comprehensive coverage of the hydraulic system, including pump, valves, and cylinders Electrical: Detailed wiring diagrams and electrical system diagnostics Fuel System: Service and troubleshooting of the fuel injection system Cooling System: Maintenance and repair of the cooling system components Braking System: Service and repair of the braking system, including hydraulic and mechanical aspects Steering System: Repair and adjustment of the steering mechanism, including power steering Powertrain: All aspects of powertrain maintenance and repair Chassis: Frame, axle, and suspension service Operator Station: Service and repair of the operator's cab and controls Power Take Off: Service and maintenance of the PTO system. Hitch System: Operation and repair of the tractor's three-point hitch system. Procedures Included Maintenance: Scheduled maintenance procedures and intervals Troubleshooting: Comprehensive troubleshooting guides for common and uncommon issues Repair: Detailed step-by-step repair procedures for all major components Rebuilds: Full engine, transmission, and hydraulic system rebuild instructions Diagnostics: Advanced diagnostic techniques and fault finding Adjustments: Calibration and adjustment procedures for various systems Installation: Guidance on component installation and replacement Wiring Diagrams: Detailed electrical system wiring diagrams for troubleshooting and repair. Torques Specs: Critical torque specifications for fastener tightening. Schematics: Hydraulic and electrical schematics to understand system flow and operation. Technical Depth Depth: Factory-level, comprehensive coverage suitable for professional technicians and experienced owners Detail Level: In-depth technical explanations, specifications, and diagrams Diagnostic Tools: Information on required special tools and diagnostic procedures. 📊 Manual Specifications File Format Digital Format: PDF (Requires Adobe PDF Reader) Compatibility: Compatible with all Windows and Mac versions Print Quality Searchability: Searchable text for quick information retrieval Binding Type Binding: N/A (Digital download) Paper Type Paper Quality: N/A (Digital download) ⚙️ Engine Specifications Primary Engine Engine Model: International Harvester DT-466 (6-cylinder diesel) Displacement: 466 cubic inches (7.6 liters) Fuel Type: Diesel Engine Block Type: Cast iron, wet sleeve cylinder liners Performance Horsepower Rated: Approximately 110-120 PTO horsepower (varies slightly by specific configuration) Torque Peak: High torque output, typical for its class Fuel System Injection Type: Direct injection, typically rotary or inline pump injection system Fuel Pump Type: Typically a Bosch inline or rotary injection pump 🔧 Transmission Standard Transmission Type: International Harvester 16-speed Power Shift (or optional manual transmission) Gear Ranges: 16 forward, 8 reverse (with powershift) Features Powershift Operation: Electro-hydraulic control for on-the-go shifting 📐 Dimensions Exterior Wheelbase: Approx. 102 inches (2590 mm) Weights Operating Weight: Approx. 9,500 - 11,000 lbs (4300 - 5000 kg) depending on configuration 💡 Technology Features Infotainment Operator Interface: Focus on functional controls and instrumentation, not modern infotainment systems. Driver Assistance Assistance Features:...