🏷️ Basic Information Identification Make: International Harvester Model: 766, 826, 966, 1026, 1066 Product Type: Service Repair Manual (WSM) 👋 Introduction Market Position Target Audience: Tractor owners, mechanics, farm equipment repair shops. Value Proposition Cost Savings: Enables users to perform their own repairs, saving significant costs compared to professional service. Key Features Ease Of Use: Easy-to-follow, step-by-step instructions. Comprehensiveness: Covers all services, repairs, and routine maintenance. 📋 Manual Details Coverage Areas Covered Models: International Harvester 766, 826, 966, 1026, 1066 Tractors Page Count Estimated Page Count: Varies by specific model, but typically extensive (e.g., 500+ pages for comprehensive manuals) Manual Type Manual Type: Workshop Service Manual (WSM) / Repair Manual Language Language: English Format File Format: PDF Download Type: Instant Download Requirements Reader Requirement: Adobe PDF Reader Compatibility: All Versions of Windows & Mac 📖 Manual Coverage Systems Covered Engine: Engine overhaul, tuning, fuel system, lubrication, cooling system, starting and charging systems, engine diagnostics. Transmission: Transmission overhaul, clutch, gear shifting mechanisms, torque amplifier, power take-off (PTO) operation and repair. Hydraulics: Hydraulic system operation, pump service, valve assembly, cylinder repair, hitch control, hydraulic fluid specifications. Electrical: Wiring diagrams, lighting systems, starter motor, alternator, battery service, ignition system troubleshooting, instrument panel. Chassis And Frame: Frame inspection and repair, front axle, rear axle, steering system, braking system. Body And Cab: Cab structure, operator controls, seat, fenders, sheet metal repair, painting guidance. Procedures Included Routine Maintenance: Lubrication charts, filter replacement intervals, fluid level checks, greasing points. Diagnostics And Troubleshooting: Step-by-step diagnostic procedures for common and uncommon issues, symptom-based troubleshooting guides. Major Repairs: Complete disassembly, inspection, repair, and reassembly of all major tractor components. Component Rebuild: Detailed instructions for rebuilding engines, transmissions, hydraulic pumps, and other critical assemblies. Technical Specifications: Torque specifications, clearances, timing procedures, hydraulic pressures, electrical resistance values. Technical Depth Depth: In-depth, professional quality, covering all areas of repair and maintenance. Visual Aids Illustrations: Pictures and diagrams included for clarity. Wiring Diagrams: Comprehensive wiring diagrams provided for electrical system troubleshooting and repair. 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: Full Printable Print Usage: Printable pages for workshop convenience. Binding Type Binding Type: Digital (PDF Download) - No physical binding Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Families: Models likely feature International Harvester's D-series and DT-series diesel engines (e.g., D-236, DT-236, D-268, DT-268, D-310, DT-310, DT-358, DT-407 depending on model and specific variant). Engine Displacement Displacement Range: Approximately 236 to 407 cubic inches (3.8 to 6.7 liters) across the model range. Performance Horsepower Range: Engine horsepower typically ranged from around 65 HP for the 766 to over 100 HP for the 1066 models. Torque Specifications: Specific torque figures are detailed within the manual for engine components and assembly. Fuel System Injection System: Typically rotary or inline injection pumps (e.g., CAV, Bosch) for diesel engines. Fuel Type: Diesel 🔧 Transmission Standard Transmission Types: Manual transmission, often with a synchronized gearbox. Torque Amplifier (TA) option was common. Optional Powershift Transmission: Some higher horsepower models may have had optional powershift transmissions available. Features Torque Amplifier: The Torque Amplifier provided a low-range gear reduction without clutching, effectively doubling the number of gears. 📐 Dimensions Exterior Overall Length: Varies by model and configuration (e.g., 2WD vs. 4WD, loader attachments). Wheelbase: Specifications vary by model, but are provided in the manual. Weights Operating Weight: Typically ranges from 8,000 to 12,000+ lbs depending on the model and options. 🛡️ Safety Features Passive Features Operator Station: Basic operator stations, often with ROPS (Roll-Over Protective Structure) options or requirements depending on the era and specific configuration. Active Features Braking System: Hydraulically actuated disc brakes, often internal expanding or enclosed wet disc brakes. 💡 Technology Features Infotainment Infotainment Systems: N/A (Tractors of this era featured functional operator controls, not modern infotainment systems). Driver Assistance Assistance Features: N/A (Basic mechanical controls). Connectivity Connectivity Features: N/A 🔧 Maintenance Service Intervals Engine Oil Change: Typically every 100-250 operating hours, depending on operating conditions and oil type. Hydraulic Fluid Change: Usually recommended at 500-1000 operating hours or annually. Fluid Specifications Engine Oil: API CD or CE rated diesel engine oil, SAE 30 or 10W-30 depending on temperature. Hydraulic Fluid: IH Hy-Tran fluid or equivalent UTF (Universal Tractor Transmission fluid) meeting specific IH specifications (e.g., T-22). Transmission Fluid: IH Hy-Tran fluid or equivalent UTF. Coolant: Ethylene glycol based antifreeze mixture, typically a 50/50 blend with distilled water. Known Issues Torque Amplifier Failure: Can be prone to wear and failure if not operated correctly or if maintenance is neglected. Hydraulic System Leaks: Aging seals and hoses can lead to hydraulic fluid leaks. Engine Component Wear: Standard wear on pistons, rings, bearings, and valve train after extensive use. 📚 Vehicle History Brand Heritage Manufacturer: International Harvester (IH), a significant American manufacturer of agricultural machinery and vehicles. Model Evolution Series Context: These...