🏷️ Basic Information Identification Make: David Brown Model: Selectamatic Codes Production Period: 1970-1979 👋 Introduction Market Position Target User: Owners, mechanics, and restoration specialists of David Brown Selectamatic tractors from the 1970-1979 era. Competitive Analysis Value Proposition: Provides comprehensive, factory-level repair and maintenance information, essential for preserving and servicing these classic agricultural machines. Key Features Manual Access: Instant download provides immediate access to critical service data. Completeness: Covers a wide range of models and systems, representing a full workshop manual. 📋 Manual Details Coverage Areas Engines: Diesel engines (specific models to be detailed within manual) Transmissions: Selectamatic transmission system Drive Types: 2WD (Rear-wheel drive) typically Steering Systems: Power steering and manual steering systems Braking Systems: Hydraulic braking systems (disc and drum configurations if applicable) Electrical Systems: 12-volt electrical systems, lighting, ignition, starting circuits Hydraulic Systems: Tractor hydraulics, PTO hydraulics, linkage systems Chassis And Bodywork: Frame, fenders, operator station, drawbar Auxiliary Equipment: Power Take-Off (PTO), linkage, hydraulic remote valves Page Count Estimated Pages: Comprehensive (exact count not specified but expected to be extensive for full factory manual) Manual Type Type: Factory Service & Repair Workshop Manual Language Primary Language: English Format Delivery Method: PDF Download 📖 Manual Coverage Systems Covered Engine Overhaul: Detailed disassembly, inspection, repair, and reassembly procedures for all engine components. Transmission Repair: In-depth coverage of the Selectamatic transmission, including hydraulic system, gear selection, and final drive repairs. Clutch And Drive Axles: Maintenance and repair of the clutch assembly and rear drive axles. Steering Mechanism: Adjustment, repair, and overhaul of steering gears and linkages. Brake System Maintenance: Brake caliper/wheel cylinder overhauls, hydraulic line replacement, bleeding procedures. Electrical Diagnostics: Wiring diagrams, troubleshooting guides for starting, charging, lighting, and auxiliary electrical systems. Hydraulic Circuitry: Diagrams and repair procedures for the tractor's main hydraulic system, including pumps, valves, and cylinders. Cooling System: Radiator, thermostat, water pump, and coolant flow troubleshooting. Fuel System Service: Diesel injection pump and injector maintenance, fuel filter replacement, bleeding. Pto And Hitch Systems: Service and adjustment of the Power Take-Off (PTO) and the three-point hitch. Procedures Included Routine Maintenance: Oil changes, filter replacements, lubrication points, and general inspections. Troubleshooting Guides: Diagnostic procedures for common and uncommon faults across all systems. Component Replacement: Step-by-step instructions for replacing major and minor components. Adjustment Procedures: Settings and adjustments for engine timing, clutch engagement, brake linkages, hydraulic pressures. Overhaul Instructions: Comprehensive rebuild instructions for engines, transmissions, and hydraulic pumps. Electrical Wiring Diagrams: Detailed wiring schematics for all electrical circuits. Technical Depth Diagnostic Capabilities: Advanced diagnostic procedures, fault finding based on symptoms and measurements. Repair Complexity: Covers everything from basic adjustments to full engine and transmission rebuilds. Specification Detail: Includes detailed torque specifications, clearances, tolerances, and fluid capacities. 📊 Manual Specifications File Format Format: Portable Document Format (PDF) Print Quality Resolution And Clarity: High-resolution, clear images and text for easy reading and printing. Binding Type Delivery Format: Digital Download (No physical binding) Paper Type Digital Medium: Digital file for viewing on computers, tablets, and smartphones. ⚙️ Engine Specifications Primary Engine Engine Type: Typically 3-cylinder or 4-cylinder indirect injection diesel engines (specific models vary). Displacement: Varies by model; common displacements include around 2.5L to 3.6L (e.g., AD4.203, AT4.236). Performance Horsepower Range: Typically 40-70 HP, depending on the specific model and engine variant. Torque Characteristics: Designed for strong low-end torque, suitable for agricultural applications. Fuel System Injection System: Indirect injection, typically with CAV or Bosch fuel injection pumps. Fuel Type: Diesel Fuel 🔧 Transmission Standard Transmission Type: Selectamatic (Hydromechanical transmission with variable speed control) Optional Gearbox Variants: Likely a single primary transmission type, the Selectamatic, with variations in gear ratios for specific models. Features Speed Control: Infinitely variable speed control within ranges via a lever and hydraulic actuation. Hydraulic Pump: Integral hydraulic pump for transmission operation and implement control. 📐 Dimensions Exterior Overall Length: Varies by model, typically around 3.3-3.8 meters. Overall Width: Varies by model, typically around 1.7-2.0 meters (track width adjustable). Wheelbase: Varies by model, typically around 2.0-2.2 meters. Weights Operating Weight: Approximately 2000-2500 kg, depending on configuration. Tare Weight: Refer to specific model specifications within the manual. 🛡️ Safety Features Ratings Safety Standards: Manufactured to industry standards of the era; modern ROPS/FOPS often retrofitted. Active Features Braking Performance: Hydraulic drum or disc brakes offering reliable stopping power. Passive Features Operator Station: Open operator station with basic controls and seating. 💡 Technology Features Infotainment Operator Interface: Basic mechanical controls, no electronic infotainment systems. Driver Assistance Safety Features: Primarily mechanical safety features; no electronic driver assistance systems. Connectivity Communication Features: No electronic connectivity features. 🔧 Maintenance Service Intervals Engine Oil Change: Typically every 250-300 operating hours (refer to manual for precise intervals). Transmission Fluid Change: Annually or every 500 operating hours (refer to manual for specific fluid type and interval). Fuel Filter Replacement: Regular replacement as per operating hours or if issues arise (e.g.,...