This manual covers the International Harvester 786, 886, 986, and 1086 tractor models, produced primarily in the late 1970s and early 1980s. These tractors are known for their robust construction and reliable performance, building on International Harvester's long heritage in agricultural machinery. Designed for heavy-duty farm work, they feature powerful diesel engines, various transmission options including PowerShift, and heavy-duty drivetrains. Their engineering quality and durability have made them a trusted choice for generations of farmers and operators. This Factory Service Repair Manual provides comprehensive information for maintaining and repairing your International Harvester tractor. It details procedures for engine overhaul, transmission service, hydraulic system maintenance, and electrical system diagnostics. The manual includes essential technical specifications, torque values, fluid recommendations, and troubleshooting guides to assist in identifying and resolving common issues. Its depth of coverage is suitable for both professional mechanics and skilled owners seeking to ensure the optimal performance and longevity of their equipment. 🏷️ Basic Information Identification Make: International Harvester Model: 786, 886, 986, 1086 Tractor Product Type: Factory Service Repair Manual 👋 Introduction Market Position Positioning: Essential diagnostic and repair resource for owners and technicians of International Harvester 786, 886, 986, and 1086 tractors. Competitive Analysis Competitors: Provides factory-level detail often superior to aftermarket manuals, ensuring accuracy for specialized IH components. Key Features Convenience: Instant download access, searchable text for quick information retrieval, ability to print specific sections as needed. Cost Savings: Empowers users to perform their own maintenance and repairs, significantly reducing labor costs. Knowledge Base: Provides in-depth understanding of tractor systems, crucial for efficient operation and emergency repairs. 📋 Manual Details Coverage Areas Primary Coverage: International Harvester 786, 886, 986, 1086 Tractors Additional Coverage: Troubleshooting guides, maintenance schedules, parts information (often referenced), and technical specifications. Page Count Estimated Pages: Varies by specific factory manual, typically 500-1500+ pages for comprehensive coverage. Manual Type Type: Factory Service and Repair Manual Type Detail: Factory Service Repair Manual; also referred to as Shop Manual or Workshop Manual. Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine: Engine overhaul, fuel system, lubrication, cooling system, starting and charging systems, troubleshooting. Transmission: Manual transmission, power shift transmission (if applicable), differential, final drives, PTO (Power Take-Off). Hydraulic System: Hydraulic pump, control valves, cylinders, system pressure checks, troubleshooting, fluid specifications. Electrical System: Wiring diagrams, lighting, starter motor, alternator, battery, ignition system (if applicable), instrument panel. Chassis And Drive: Front axle, rear axle, steering system, brakes (mechanical and hydraulic), clutch, wheel and tire specifications. Operator Station: Cab components, controls, seating, instrumentation, heating and air conditioning (if equipped). Body And Frame: Sheet metal, fenders, drawbar, hitch, maintenance of structural components. Procedures Included Maintenance: Scheduled maintenance, lubrication points, fluid change intervals, filter replacement. Troubleshooting: Diagnostic charts, common problems and their solutions, systematic fault finding. Repair: Step-by-step disassembly, inspection, repair, and reassembly procedures for all major components. Diagnostics: Procedures for checking engine performance, hydraulic pressures, electrical circuits, and drivetrain operation. Adjustments: Brake adjustments, clutch adjustments, linkage adjustments, hydraulic valve adjustments. Specifications: Torque specifications, clearances, fluid capacities, pressure settings, electrical resistance values. Wiring Diagrams: Includes comprehensive wiring diagrams for electrical systems, aiding in troubleshooting and repair of lighting, starting, and charging circuits. Torque Specs: Detailed torque specifications for critical fasteners throughout the tractor, ensuring proper assembly and preventing component failure. Technical Depth Depth: Comprehensive, covering from routine maintenance to major component overhaul and repair. Suitable for both professional mechanics and skilled owners. Component Rebuild: Procedures for complete disassembly, inspection, and rebuilding of major engine, transmission, and hydraulic components. 📊 Manual Specifications File Format Format: PDF Compatibility: Compatible with all Windows and Mac operating systems. Software Requirements: Adobe PDF Reader, WinZip or equivalent decompression software. Print Quality Quality: High-resolution, digitally scanned factory documentation for clear text and legible diagrams. Binding Type Binding: Digital download (not a physical book). Paper Type Paper: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Family: International Harvester DT-402 / DT-466 Diesel (Commonly found in these models, though variations may exist). Displacement: DT-402: 402 cubic inches (6.6 Liters); DT-466: 466 cubic inches (7.6 Liters) Bore X Stroke: DT-402: 4.31 in x 4.75 in; DT-466: 4.59 in x 4.75 in (approximate values, consult manual for exact figures). Engine Type: Vertical, water-cooled, four-stroke diesel engine. Performance Horsepower Range: Model dependent, typically ranging from 70 HP (786) to over 120 HP (1086) in various configurations. Torque Range: Significant torque output suitable for heavy draft work, specific values vary by engine and tuning. Fuel System Fuel Type: Diesel Injection System: Bosch inline injection pump or distributor type, depending on exact model and year. Fuel Filter Part Numbers: Various aftermarket equivalents available; manual will specify IH part numbers. 🔧 Transmission Standard Transmission Type: Various configurations including 8-speed synchromesh, 16-speed PowerShift (full-clutch transmission), and 10-speed fully synchronized transmissions. Optional Optional Transmission: Optional PowerShift transmissions offered on many models for on-the-go...