This manual covers the International Harvester 248, 258, 278, and Hydro 268 tractors, produced typically in the late 1970s and early 1980s. These tractors are known for their robust construction and ability to withstand demanding agricultural environments, representing International Harvester's commitment to durable and reliable machinery. Designed for general farm work, these models offer various configurations to suit different needs, embodying the heritage of a major American manufacturer of agricultural equipment. This comprehensive factory service and repair workshop manual provides detailed instructions for all repairs, servicing, and troubleshooting procedures. It covers essential systems including the engine, transmission (both mechanical and hydrostatic), hydraulics, electrical systems, and chassis components. With hundreds of pages, including detailed photos and exploded diagrams, this English-language manual is an indispensable resource for owners, technicians, and mechanics. It offers professional-level documentation with precise specifications, torque values, and diagnostic guidance, ensuring optimal maintenance and repair for the lifetime of your tractor. 🏷️ Basic Information Identification Make: International Harvester Model: 248, 258, 278, Hydro 268 Tractor Codes Product Name: International Harvester 248 258 278 Hydro 268 Tractor Service & Repair Workshop Manual Download PDF 👋 Introduction Market Position Target Audience: Owners, technicians, and mechanics performing maintenance, repair, and diagnostics on International Harvester 248, 258, 278, and Hydro 268 tractors. Competitive Analysis Value Proposition: Comprehensive factory-level documentation for lifetime use, providing the same information used by professional mechanics. Key Features Licensing: Unlimited usage across multiple devices, no expiry dates, no renewal fees. Compatibility: Fully compatible with all Windows and MAC computers. 📋 Manual Details Coverage Areas Coverage Scope: All repairs, servicing, and troubleshooting procedures for International Harvester 248, 258, 278, and Hydro 268 tractors. Page Count Estimated Page Count: Hundreds of pages Manual Type Type: Factory Service & Repair Workshop Manual Language Language: English Format Format: Downloadable PDF File Format File Type: PDF Print Quality Printability: Printable (single pages or entire manual) Binding Type Binding: Digital Download (N/A) Paper Type Paper Quality: Digital Download (N/A) 📖 Manual Coverage Systems Covered Engine: Detailed engine overhaul, troubleshooting, and component repair (e.g., fuel system, cooling system, lubrication). Transmission: Repair and service of mechanical and hydrostatic transmissions, including gearboxes, clutch, and hydrostatic drive units. Hydraulics: Operation, maintenance, and repair of the hydraulic system, including pumps, valves, cylinders, and auxiliary equipment. Electrical: Complete electrical system diagnosis, wiring diagrams, component testing, and repair of starting, charging, and lighting systems. Chassis: Front axle, steering, brakes, and rear axle assembly maintenance and repair. Operator Station: Dashboard, controls, seating, and safety features. Procedures Included Maintenance: Scheduled maintenance, lubrication, filter changes, and general upkeep procedures. Troubleshooting: Systematic diagnostic procedures and symptom-based troubleshooting guides for common and uncommon issues. Repair: Step-by-step instructions for component removal, disassembly, inspection, repair, and reassembly. Overhaul: Complete engine, transmission, and hydraulic system overhaul procedures. Technical Adjustments: Precise adjustments for fuel injection timing, valve clearance, clutch engagement, and hydraulic pressures. Technical Depth Depth: Professional level, covering detailed component specifications, torque values, clearances, and diagnostic fault codes. Diagrams: Hundreds of detailed photos and exploded diagrams for clear visual guidance. ⚙️ Engine Specifications Primary Engine Engine Type: Diesel (Specific engine models vary by tractor variant, typically 3 or 4-cylinder International Harvester/McCormick engines). Performance Horsepower Range: Estimated 45-70 PTO horsepower (Varies by specific model and engine configuration). Fuel System Fuel Type: Diesel Fuel Injection System: Typically rotary or inline injection pumps (e.g., CAV, Bosch) with associated troubleshooting and timing procedures. 🔧 Transmission Standard Transmission Type Standard: Constant mesh, sliding gear transmission (3-point hitch models). Optional Transmission Type Optional: Hydrostatic transmission (Hydro 268 and potentially other variants). Features Clutch: Single or dual-stage dry clutch (depending on PTO and transmission). Power Takeoff: Live PTO and/or independent PTO (specifications detailed in manual). 📐 Dimensions Weights Operating Weight: Approx. 4,000 - 5,500 lbs (Varies by model and configuration). 🛡️ Safety Features Ratings Safety Features Standard: ROPS (Roll-Over Protective Structure) often an option, seat belts, operator presence levers, safety shielding on PTO and moving parts. 💡 Technology Features Infotainment Features: Basic operator controls, gauges for engine status (oil pressure, coolant temperature, fuel level), tachometer. Driver Assistance Features: Power steering (often optional or power-assisted), differential lock. 🔧 Maintenance Service Intervals Engine Oil Change: Typically every 100-250 operating hours or annually (refer to manual for specific interval). Fuel Filter Change: As needed or every 250-500 hours. Hydraulic Fluid Change: Typically every 500-1000 operating hours. Fluid Specifications Engine Oil Viscosity: Typically SAE 30W or 15W-40 Diesel Engine Oil (refer to manual for exact API rating). Hydraulic Fluid Type: IH Hy-Tran Fluid or equivalent UTF (Universal Tractor Transmission Fluid) meeting IH specifications. Coolant Type: Ethylene Glycol based antifreeze (typically 50/50 mix with water). Known Issues Common Wear Items: Clutch wear, hydraulic pump and valve wear, starter motor issues, radiator leaks, injector pump calibration. Electrical Problems: Corrosion in wiring harnesses, faulty light switches, alternator or generator issues. 📚 Vehicle History Brand...