🏷️ Basic Information Identification Make: International Harvester Model: 674 Tractor 👋 Introduction Market Position Target User: Tractor owners, mechanics, agricultural technicians, and hobbyists seeking to perform maintenance and repairs on the International Harvester 674. Key Features Value Proposition: Enables cost savings through DIY repairs, provides in-depth technical guidance, and enhances operational knowledge of the tractor. Manual Benefit: Facilitates easy, step-by-step repair jobs with detailed instructions, pictures, and wiring diagrams. 📋 Manual Details Coverage Areas Manual Type: Workshop Service Manual (WSM) Language: English Format: PDF Download 📖 Manual Coverage Systems Covered Engine Service: Complete engine overhaul, disassembly, assembly, lubrication, cooling system, fuel system, exhaust system, starting and charging systems. Transmission Service: Gearbox overhaul, clutch service, PTO operation and repair, differential service, hydraulic lift system. Electrical System: Wiring diagrams, lighting, starting system, charging system, instrumentation, troubleshooting. Hydraulic System: Hydraulic pump, control valves, cylinders, external hydraulic circuits, troubleshooting and maintenance. Front Axle And Steering: Front axle overhaul, steering mechanism repair, wheel alignment. Rear Axle And Brake: Rear axle overhaul, brake system maintenance and repair, parking brake. Body And Chassis: Frame, fenders, operator station, ballast, hitches. Procedures Included Maintenance Procedures: Routine maintenance, lubrication charts, fluid level checks, filter replacement, greasing points. Troubleshooting Guide: Diagnostic procedures for common problems, fault finding charts, specific symptom analysis. Repair Procedures: Step-by-step instructions for disassembly, repair, and reassembly of all major components. Adjustment Procedures: Valve lash adjustments, brake adjustments, clutch adjustments, hydraulic control adjustments. Wiring Diagrams: Detailed electrical schematics for various circuits and options. Technical Depth Depth Of Coverage: Comprehensive, covering routine maintenance to full engine and transmission rebuilds, including advanced diagnostics and specialized repairs. 📊 Manual Specifications File Specifications File Format: PDF Print Quality: Full Printable (high resolution for clarity) Searchability: Likely text-searchable PDF for quick information retrieval. Delivery Method Delivery: Instant Download Requirements Software Requirements: Adobe PDF Reader Operating System Compatibility: All Versions of Windows & Mac ⚙️ Engine Specifications Primary Engine Engine Model Common: Typically featured engines like the D-179 or D-206 diesel (specific engine may vary by region/configuration). Performance Horsepower Range: Approximately 60-70 PTO horsepower (dependent on specific engine variant and configuration). Fuel System Fuel Type: Diesel Injection Type: Indirect injection (IDI) via distributor-type injection pump (e.g., CAV or Simms). Lubrication Oil Specification Example: API CD or CE rated diesel engine oil, SAE 15W-40 recommended for general use (refer to manual for exact specification). Cooling System Coolant Type: Ethylene glycol-based antifreeze mixture (50/50 with distilled water). 🔧 Transmission Standard Gearbox Type: Constant mesh, sliding gear transmission with multiple forward and reverse gears. Gear Configurations Common: 8 forward speeds and 2 reverse speeds, often with a high/low range selector for a total of 16 forward and 4 reverse gears. Features Pto System: 540/1000 RPM Power Take-Off (PTO) with a synchronized drive option. Differential Lock: Optional rear differential lock for improved traction. Fluid Specifications Transmission Oil Type: API GL-4 or GL-5 gear oil, SAE 80W-90 recommended (check manual for specific drivetrain requirements). 📐 Dimensions Exterior Wheelbase Approximate: Approximately 84 inches (2134 mm). Weights Operating Weight Approximate: Around 5,000-5,500 lbs (2268-2495 kg), depending on configuration and ballast. 🛡️ Safety Features Passive Features Operator Station Design: Designed for operator visibility and accessibility, often with a ROPS (Roll-Over Protective Structure) frame as an option or standard on later models. 💡 Technology Features Infotainment Operator Interface: Basic instrumentation cluster with essential gauges (tachometer, oil pressure, temperature, fuel level) and controls for a functional operator experience. 🔧 Maintenance Service Intervals Engine Oil Change: Typically every 100-250 operating hours, or annually (refer to manual for precise interval based on usage and oil type). Air Filter Service: Check daily, clean or replace as needed, typically every 50-100 operating hours depending on dust conditions. Fuel Filter Replacement: Replace every 250-500 operating hours or as recommended. Transmission Oil Change: Every 1000-1500 operating hours, or every two years. Fluid Specifications Hydraulic Oil Type: Universal Tractor Transmission Oil (UTTO) meeting IH B-6 specification, or a suitable UTF (Universal Tractor Fluid). Known Issues Common Wear Points: Wear in the final drives, clutch wear, hydraulic pump output degradation, and potential seal leaks due to age. Electrical Corrosion: Common in older vehicles; wiring harness connectors and grounds can corrode, leading to intermittent electrical faults. Diesel Injection System: Injector pump wear or fuel system contamination can affect starting and performance. 📚 Vehicle History Brand Heritage Manufacturer Legacy: International Harvester (IH) was a prominent American manufacturer of agricultural and construction equipment, known for its robust and reliable machinery. Model Evolution Series Placement: Part of the 674 series, which succeeded earlier models and represented a refinement in IH's utility tractor line, bridging the gap between smaller utility and larger row-crop tractors. Production Production Period: The 674 was primarily produced in the 1970s, part of the broader range of International Harvester tractors that followed the acquisition of the David Brown tractor line. 🏆 Awards &...