This manual covers the David Brown Selectamatic, a line of tractors produced between 1970 and 1979. Known for their robust British engineering, these vehicles were designed for demanding agricultural applications, featuring reliable diesel engines and the innovative Selectamatic transmission system that offered unparalleled control for its time. The Selectamatic models represent a significant chapter in David Brown's legacy of producing dependable and versatile farm machinery, built to withstand the rigors of daily work. This comprehensive factory service and repair workshop manual provides essential information for owners, mechanics, and restoration specialists. It details maintenance procedures, troubleshooting guides, and technical specifications for the entire vehicle, including diesel engines, the unique Selectamatic transmission, drive types, steering and braking systems, and electrical and hydraulic circuits. The manual is presented in English and is designed to assist in the proper upkeep and repair of your David Brown Selectamatic, ensuring its continued performance and longevity. 🏷️ 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...