This manual covers the International Harvester (IH) / Case IH 1594 and 1690 tractor models, produced during the late 1970s through the 1980s. These tractors, representing a continuation of the David Brown lineage, are known for their robust engineering, reliability, and versatility in agricultural applications. The 1594 typically features a 5.8L Perkins diesel engine producing around 90-100 PTO HP, while the 1690 is equipped with a likely 6.2L Perkins diesel engine delivering approximately 100-110 PTO HP. Both models utilize a manual shuttle shift transmission and are built on a solid chassis designed for demanding work. This comprehensive Factory Service and Repair Workshop Manual provides in-depth information essential for the maintenance and repair of your IH / Case IH 1594 or 1690 tractor. It details procedures for all major systems, including engine, fuel, cooling, lubrication, transmission, hydraulics, powertrain, electrical, steering, braking, chassis, and operator station. The manual includes routine maintenance schedules, systematic troubleshooting guides, step-by-step repair and overhaul instructions, component replacement procedures, and adjustment specifications. With hundreds of detailed photos and exploded diagrams, this resource is designed for professional mechanics, farm technicians, and experienced owners seeking factory-level repair information. 🏷️ Basic Information Identification Make: International Harvester (IH) / Case IH Model: 1594 / 1690 Tractor Product Type: Service & Repair Workshop Manual Product Format: Downloadable PDF 👋 Introduction Market Position Target User: Professional mechanics, farm technicians, and experienced tractor owners Competitive Analysis Value Proposition: Comprehensive factory-level repair information at a fraction of the cost of dealership service Key Features Content Completeness: Full factory service and repair coverage, no limitations or trial periods Accessibility: Instant download for immediate use across multiple devices 📋 Manual Details Coverage Areas Primary Coverage: IH Case David Brown 1594 and 1690 Tractor models Page Count Estimated Page Count: Hundreds (specific number not provided, but described as comprehensive) Manual Type Type: Factory Service and Repair Workshop Manual Language Language: English Format Digital Compatibility: Windows and MAC computers, tablets, and smartphones 📖 Manual Coverage Systems Covered Engine: Detailed diagnostics, repair, overhaul, and tuning of engine systems Fuel System: Inspection, repair, and calibration of fuel injection pumps, injectors, and fuel lines Cooling System: Maintenance and repair of radiator, water pump, thermostat, and coolant circuits Lubrication System: Oil pump, filters, lubrication passages, and oil pressure checks Transmission: Service and repair of gearbox, clutch, PTO (Power Take-Off) clutch, and associated components Hydraulic System: Operation, maintenance, and repair of hydraulic pump, valves, cylinders, and lift systems Powertrain: Complete coverage of drive axles, differentials, and final drives Electrical System: Wiring diagrams, starter, alternator, battery, lighting, and instrument panel diagnostics Steering System: Maintenance and repair of power steering components Braking System: Service and repair of hydraulic and parking brake systems Chassis And Frame: Inspection and repair of main frame and structural components Operator Station: Repair and maintenance of cab, controls, and seating Procedures Included Routine Maintenance: Scheduled servicing, lubrication, fluid changes, filter replacements Troubleshooting: Systematic diagnostic procedures for identifying and resolving faults Repair And Overhaul: Step-by-step instructions for component disassembly, repair, and reassembly Component Replacement: Detailed guides for replacing major and minor components Adjustments: Calibration and adjustment procedures for various systems (e.g., valve lash, clutch, brakes) Engine Rebuild: Complete engine overhaul instructions, including torque specifications and clearances Technical Depth Depth: Professional-level, comprehensive for mechanics and technicians Diagrams And Illustrations: Hundreds of detailed photos and exploded diagrams Diagnostic Procedures: Includes specific troubleshooting trees and symptom-based diagnostics 📊 Manual Specifications File Format Format: PDF (Portable Document Format) Searchability: Likely text-searchable (typical for professional PDF manuals) Print Quality Printability: Full printability of individual pages or the entire manual Binding Type Digital Binding: N/A (digital download) Paper Type Digital Paper Type: N/A (digital download) Licensing Usage Rights: Lifetime use, unlimited devices, no expiry ⚙️ Engine Specifications Primary Engine Engine Manufacturer: Perkins (common for this era of Case/IH tractors, specific model dependent) Engine Displacement 1594: Likely 5.8L (354 cubic inches) 6-cylinder diesel (e.g., Perkins 6.354 series) Engine Displacement 1690: Likely 6.2L (377 cubic inches) 6-cylinder diesel (e.g., Perkins 6.354.4 series) Performance Horsepower 1594 Est: Approximately 90-100 PTO HP (Power Take-Off Horsepower) Horsepower 1690 Est: Approximately 100-110 PTO HP (Power Take-Off Horsepower) Fuel System Fuel Injection Type: Direct Injection, typically with rotary or inline injection pumps (e.g., CAV, Bosch) Fuel Type: Diesel Maintenance Specs Oil Capacity Est Qts: Approximately 15-20 quarts (refer to manual for exact) Recommended Oil Viscosity Est: SAE 15W-40 (for most operating temperatures, refer to manual) 🔧 Transmission Standard Gearbox Type: Manual Shuttle Shift (MSS) or partially synchronized gearbox Number Of Gears: Typically 12 forward and 4 reverse speeds (depending on specific configuration) Optional Powershift: Not typically available as a standard option for these models, manual shuttle was common Features Pto Clutch: Independent PTO clutch (often a 2-stage clutch for road and PTO operation) Diff Lock: Differential lock (usually rear axle), operated by foot pedal Maintenance Specs Transmission...