The International Harvester 674 Tractor, produced primarily in the 1970s, represents a robust and reliable piece of agricultural machinery. As part of the esteemed International Harvester legacy, known for its durable and dependable equipment, the 674 model offered significant workhorse capability. This tractor, typically powered by a diesel engine and featuring a versatile transmission with multiple gear configurations, was designed to meet the demanding needs of farming and general utility tasks. Its engineering quality and enduring performance have made it a valued asset within the agricultural community. This Workshop Service Manual (WSM) provides comprehensive technical guidance for the International Harvester 674 Tractor. It covers all essential systems, including detailed engine overhaul procedures, transmission and clutch service, hydraulic system maintenance, and electrical system diagnostics with wiring diagrams. The manual also includes information on front and rear axle repairs, brake systems, and chassis components. Its purpose is to equip tractor owners, mechanics, and technicians with the knowledge required for routine maintenance, troubleshooting, and repair, ensuring the continued optimal performance and longevity of the vehicle. 🏷️ 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...