Basic Information Identification Make: International Harvester Model: 766, 826, 966, 1026, 1066 Tractor Series Codes Manual Product Code: Not specified Introduction Market Position Target Audience: Professional Technicians and DIY Mechanics Competitive Analysis Value Proposition: Provides the same comprehensive information as professional service manuals, accessible digitally without shipping delays. Key Features Illustration Detail: Detailed illustrations, drawings, and photos guide through procedures; enlarged insets for detailed part examination. Navigability: Numbered table of contents for fast information retrieval; bold figure numbers link illustrations to instructions. Safety Information: Includes notes, cautions, and warnings throughout each chapter for critical safety and procedural information. Manual Details Coverage Areas Covered Models: International Harvester 766, 826, 966, 1026, 1066 Tractors Page Count Estimated Page Count: Not specified, but described as 'comprehensive' and 'full service' Manual Type Type: Full Service Repair Manual Language Language: English Format Digital Format: PDF Manual Coverage Systems Covered Engine: Full engine overhaul, diagnostics, repair, rebuilding procedures. Transmission: Detailed repair, maintenance, and diagnostics for all transmission types used in these models. Drivetrain: Front and rear axle repair, differential, final drives, PTO operation and repair. Hydraulics: Hydraulic system diagnosis, pump repair, cylinder servicing, control valve operation, and fluid management. Electrical System: Comprehensive wiring diagrams, troubleshooting guides, starter, alternator, lighting, and accessory system diagnostics and repair. Fuel System: Fuel injection/carburetion system repair, fuel pump, filter, and tank servicing. Cooling System: Radiator, water pump, thermostat, and cooling fan maintenance and repair. Braking System: Brake system repair, including mechanical and hydraulic components, adjustment procedures. Steering System: Power steering system diagnosis and repair, steering linkages, and components. Operator Station: Seat, controls, dashboard, and cab component repair and maintenance. Body Chassis: Frame, fenders, mounting points, and structural component inspection and repair. Procedures Included Maintenance: Scheduled maintenance, lubrication, filter changes, fluid checks and replacements. Troubleshooting: Detailed diagnostic procedures for common and complex issues, including electrical and mechanical faults. Repair: Step-by-step instructions for all major repair and component overhaul tasks. Rebuilding: Comprehensive rebuild procedures for engines, transmissions, hydraulic pumps, and other major assemblies. Diagnostics: Diagnostic charts, symptom analysis, and fault code interpretation (where applicable). Wiring Diagrams: Full electrical schematics with detailed component identification and routing. Technical Depth Depth: Professional-level detail for technicians, with sufficient data for experienced DIY mechanics. Detail Level: Sub-step expansion on repair procedures, notes, cautions, and warnings for critical information. Manual Specifications File Format Format: PDF Print Quality Printability: Full Printable Binding Type Binding: Digital (Printable PDF) Paper Type Paper Type: Not Applicable (Digital) Requirements Software Requirements: Adobe PDF Reader, WinRAR (for potential archive unpacking) Compatibility Operating Systems: All Versions of Windows & Mac Delivery Delivery Method: Instant Download Engine Specifications Primary Engine Engine Family: D-Series Diesel Engines (Commonly IH D-236, D-282, DT-312, DT-359, DT-407; specific engines vary by model and configuration) Performance Horsepower Range: Approximately 60-120 PTO HP, depending on specific model and engine variant. Torque Characteristics: Designed for high torque at low RPM for pulling power. Fuel System Injection System: Typically Roosa Master or Simms fuel injection pumps (for diesel models). Cooling System Cooling Type: Water-cooled, typically with a belt-driven fan and radiator. Transmission Standard Transmission Types: Various transmission options, including: Power Transfer Center (PTC), Synchromesh, and Torque Amplifier (TA) synchronized transmissions. Optional Optional Transmissions: Possibility of powershift transmissions depending on specific model configuration and year. Features Gear Selection: Multiple gear ratios for field work and road transport, often with auxiliary gearboxes. Dimensions Exterior Wheelbase: Varies by model, but typically in the range of 90-100 inches for row-crop tractors. Weights Operating Weight: Typically ranging from 7,000 to 10,000+ lbs, depending on configuration and ballast. Tow Hitch Capacity: Significant towing capacity, designed for heavy farm implements. Safety Features Ratings Rollover Protection: Availability of Roll-Over Protective Structures (ROPS) as standard or optional, depending on the year and configuration. Active Features Braking System Type: Usually mechanical disc brakes or hydraulic brakes, depending on the specific model and options. Passive Features Operator Station Design: Designed with operator comfort and safety in mind, though pre-ROPS era models may lack modern safety features. Technology Features Infotainment Radio Options: Optional AM/FM radio units were available in some cab configurations. Driver Assistance Cruise Control: Not a standard feature; mechanical throttle controls were typical. Connectivity Power Takeoff Options: Standard 540/1000 RPM PTO, often with independent PTO engagement. Maintenance Service Intervals Engine Oil Change: Typically every 100-200 operating hours, depending on operating conditions and oil type. Hydraulic Fluid Change: Recommended at intervals such as every 600-1000 operating hours, or annually. Transmission Fluid Change: Varies by transmission type, often around 1200-1500 operating hours. Fluid Specifications Engine Oil Type: CI-4 or CJ-4 rated diesel engine oil, typically SAE 15W-40 or 10W-30 depending on climate. Hydraulic Fluid Type: IH HyTran, or equivalent UTF (Universal Tractor Fluid) meeting IH specification B-6. Transmission Fluid Type: Varies by transmission, often UTF (HyTran) or specific gear oil grades. Known Issues Common Wear Points: Wear in...