The David Brown 1390 tractor, produced from the late 1970s into the 1980s, represents a robust and reliable piece of agricultural machinery originating from the United Kingdom. Known for its sturdy build and dependable performance in demanding farm environments, this tractor typically features a David Brown AD4/55 engine with approximately 3.3 liters displacement, delivering around 58-62 PTO horsepower. Its design includes a constant mesh gearbox offering 12 forward and 4 reverse gears, a dual-stage clutch, and heavy-duty planetary reduction final drives. The 1390 is equipped with hydraulically operated wet disc brakes for enhanced safety and a 3-point linkage with mechanical or hydraulic draft control for versatile implement operation. This workshop service manual provides comprehensive coverage for the David Brown 1390 tractor, encompassing repair, service, maintenance, diagnostics, and overhaul procedures. It details all major vehicle systems, including the engine, transmission, hydraulics, electrical components, chassis, and braking system. The manual offers step-by-step repair instructions, detailed overhaul procedures for key components, troubleshooting guides, and essential wiring diagrams. It is designed to assist professional tractor technicians, agricultural workshops, and competent DIY owners in maintaining and repairing the vehicle, ensuring its longevity and optimal performance. 🏷️ Basic Information Identification Make: David Brown Model: 1390 Vehicle Type: Tractor Codes Manual Product Name: David Brown 1390 Workshop Service Manual Repair 👋 Introduction Market Position Target Audience: Professional tractor technicians, agricultural workshops, and serious DIY tractor owners. Key Features Benefits: Cost savings on labor by performing repairs in-house, accurate and complete technical data, instant accessibility. Digital Advantage: Printable sections, no physical wear and tear from oil or dirt, immediate access. 📋 Manual Details Coverage Areas Manual Coverage Scope: Comprehensive repair, service, maintenance, diagnostics, and overhaul procedures for the David Brown 1390 tractor. Page Count Estimated Page Count: Hundreds of pages (specific number not provided, but described as extensive). Manual Type Type: Workshop Service Manual / Repair Manual Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered Engine: Complete engine overhaul, repair, troubleshooting, and maintenance (including fuel system, lubrication, cooling). Transmission: Repair, maintenance, and troubleshooting of the gearbox, clutch, and drivetrain components. Hydraulics: Details on the hydraulic system, pump, lift arms, control valves, and associated components for implement operation. Electrical: Wiring diagrams, troubleshooting electrical faults, starter, alternator, lighting, and instrumentation. Chassis And Frame: Information on frame integrity, steering system, front axle, and rear axle assemblies. Braking System: Service and repair procedures for the braking system. Cooling System: Radiator, fan, thermostat, and coolant circuit maintenance and repair. Fuel System: Fuel injection pump, injectors, filters, and tank maintenance and repair. Lubrication System: Oil pump, filter, and lubrication points for engine and drivetrain. Body And Cab: Procedures for body panels, cab components, and operator controls. Procedures Included Maintenance: Periodic maintenance charts, lubrication schedules, fluid checks, filter replacements. Repair: Step-by-step repair instructions for all major vehicle systems. Overhaul: Detailed overhaul procedures for major components such as the engine and transmission. Troubleshooting: Diagnostic information and troubleshooting guides for identifying and resolving common issues. Diagnostics: Guidance for diagnosing system malfunctions and performance issues. Wiring Diagrams: Inclusion of comprehensive electrical wiring diagrams for accurate diagnosis and repair. Technical Depth Depth: Suitable for professional technicians and detailed for competent DIY mechanics, covering routine to complex repairs and overhauls. 📊 Manual Specifications File Format Printability: Full Printable Zoom Functionality: Zoom IN/OUT enabled for detailed viewing Delivery Delivery Method: Instant Download Requirements Software Requirements: Adobe PDF Reader & WinRAR Operating System Compatibility: All Versions of Windows & Mac Binding Type Binding: Digital (PDF Download) Paper Type Paper Type Analogy: Digital replica of high-quality printed workshop manual pages. ⚙️ Engine Specifications Primary Engine Engine Family: David Brown AD4/55 (Likely, based on model year and typical David Brown engine configurations of the era). Performance Displacement: Approximately 3.3 Litres (Likely, standard for this tractor series). Horsepower: Around 58-62 PTO horsepower (typical for 1390 model). Fuel System Fuel Type: Diesel Injection System: Inline Fuel Injection Pump (e.g., CAV or Simms, depending on specific build). 🔧 Transmission Standard Gearbox Type: Constant Mesh Gearbox with 12 forward and 4 reverse gears (common configuration for 1390). Features Clutch: Dual-stage clutch (for PTO engagement and transmission). Rear Axle Type: Heavy-duty planetary reduction final drives. 📐 Dimensions Weights Operating Weight: Approximately 2500-2800 kg (Unladen). Tow Capacity: Significant towing capacity, detailed in manual. 🛡️ Safety Features Active Features Brakes: Hydraulically operated, enclosed wet disc brakes (a significant safety feature of the era). Passive Features Roll Over Protection: ROPS (Roll-Over Protective Structure) is typically available as an option or aftermarket fitment; manual likely covers installation and maintenance if equipped. 💡 Technology Features Infotainment Instrument Panel: Basic analog gauges for engine RPM, oil pressure, coolant temperature, fuel level, and warning lights. Manual details their function. Driver Assistance Pto Engagement: Independent PTO lever, with manual detailing operational procedures and safety interlocks. Hitch Control: Mechanical and/or hydraulic draft control for...