🏷️ Basic Information Identification Make: David Brown Model: 1490 Tractor 👋 Introduction Market Position Target Audience: Professional technicians, agricultural mechanics, and experienced DIY tractor owners. Target User Skill Level: Suitable for those with basic mechanical and electrical understanding, while offering the depth required by seasoned professionals. Key Features Manual Features: Step-by-step repair procedures, critical specifications, detailed illustrations/pictures, maintenance schedules, disassembly, assembly, cleaning, and reinstallation guidance. Value Proposition Benefit To Owner: Empowers owners to make informed decisions regarding maintenance and repair, mirroring factory-trained technician knowledge. Utility Learning Curve: Assumes basic knowledge of electrical and mechanical concepts; advises caution for users without such foundation. Competitive Analysis Manual Advantage: Provides factory-level data that may be difficult to source through other means, offering a significant advantage for repair accuracy and efficiency. 📋 Manual Details Coverage Areas Manual Type: Service Repair Manual Language: English Format: PDF Download Manual Scope: Comprehensive service and repair information, not limited to specific sections or updates. 📖 Manual Coverage Systems Covered Engine: Complete engine overhaul, disassembly, assembly, inspection, and tuning procedures for the David Brown AD4.240 diesel engine. Transmission: Detailed procedures for the 8-speed synchromesh gearbox, including clutch, gearbox, and final drive assemblies. Hydraulics: Service and repair of the David Brown Selectamatic hydraulic system, including pump, valves, cylinders, and linkages. Electrical: Wiring diagrams, troubleshooting for starting and charging systems, lighting, and auxiliary electrical components. Fuel System: Information on the diesel fuel injection system, including pump and injector testing and calibration. Cooling System: Service and maintenance of the radiator, water pump, and thermostat. Steering: Repair and adjustment procedures for the steering mechanism. Brakes: Maintenance and repair of the hydraulic braking system, including master cylinder, wheel cylinders, and brake lines. Chassis And Frame: Inspection and repair of the tractor chassis and mounting points. Bodywork: Information on the hood, fenders, and operator station. Power Take Off Pto: Maintenance, repair, and adjustment of the independent PTO system. Front Axle And Steering: Detailed procedures for front axle assembly, kingpins, tie rods, and steering column repairs. Procedures Included General Maintenance: Scheduled maintenance tasks, lubrication points, and fluid level checks. Disassembly And Assembly: Step-by-step instructions for dismantling and reassembling all major components and sub-assemblies. Troubleshooting: Diagnostic charts and procedures for identifying and resolving common and uncommon operational faults. Cleaning And Inspection: Detailed guidance on cleaning parts before inspection and the critical inspection points for wear and damage. Adjustments: Procedures for adjusting critical systems such as clutch, brakes, and hydraulic linkages. Rebuilds: Comprehensive instructions for rebuilding major components like the engine, transmission, and hydraulic pump. Technical Specifications Inclusion: Critical specifications such as torque values, clearances, fluid capacities, and engine tuning parameters are included. Troubleshooting Methodology: Systematic approach to fault finding, covering electrical, hydraulic, and mechanical issues. Technical Depth Depth Of Coverage: Factory-level detail, suitable for professional technicians and experienced DIY mechanics. Diagnostic Capabilities: Provides guidance for diagnosing issues through symptoms and systematic troubleshooting steps. 📊 Manual Specifications File Format File Format: PDF Print Quality: Full Printable - High resolution for clear reproduction of text and diagrams. Zoom Capability: Yes - Allows for detailed examination of diagrams and text. Searchability: PDF format allows for text searching of keywords and phrases, enhancing efficiency. Digital Convenience: Instant download provides immediate access to repair information, reducing downtime. Compatibility Software Requirements: Adobe PDF Reader, WinZip (or equivalent decompression software). Operating Systems: Compatible with all versions of Windows and macOS. Delivery Delivery Method: Instant Download ⚙️ Engine Specifications Primary Engine Engine Model: David Brown AD4.240 Engine Type: 4-cylinder, naturally aspirated, direct injection, diesel engine. Bore And Stroke: 3.74 inches x 4.53 inches (95 mm x 115 mm) - specific dimensions are detailed in the manual. Performance Rated Horsepower: Approx. 74 PTO HP (55 kW) Displacement: 240.3 cubic inches (3.94 liters) Torque Peak: Specific torque figures are detailed within the manual for engine tuning and rebuilds. Fuel System Injection Pump: Likely Lucas or CAV injection pump (specific model covered in manual). Fuel Type: Diesel Fuel Cooling System Cooling Method: Liquid-cooled 🔧 Transmission Standard Transmission Transmission Type: David Brown 8-speed Synchromesh (often referred to as 12-speed with 4-speed splitter, but core gearbox is 8-speed). Gear Configuration: Range selector and gear selector for 8 forward and 2 reverse gears. Gear Selection Mechanism: Lever operated for range and speed selection. Features Clutch Type: Dual-clutch for independent PTO operation. Pto Type: Independent PTO, 540 RPM standard, 1000 RPM optional (dual-clutch allows engagement without clutch pedal depression). 📐 Dimensions Weights Operating Weight: Approximately 7,000 - 7,500 lbs (3,175 - 3,400 kg) depending on configuration. Front Axle Load: Specifications for front axle loading and tire pressures are included. Exterior Wheelbase: Approximately 86 inches (2184 mm). 🛡️ Safety Features Active Features Braking System Type: Hydraulically operated, internal expanding drum brakes (often referred to as 'wet' brakes in some configurations). 🔧 Maintenance Service Intervals Engine Oil Change: Typically every 250 hours or annually...