🏷️ Basic Information Identification Make: David Brown Model: Selectamatic Tractors Product Type: Workshop Service Repair Manual 👋 Introduction Market Position Target User: Farm mechanics, tractor owners, service technicians, agricultural workshops, and restoration enthusiasts working on David Brown tractors. Original Market: Medium to heavy-duty agricultural tractors, designed for a wide range of farming operations. Competitive Analysis Manual Value Proposition: Provides essential, manufacturer-authorized information for maintaining and repairing a wide range of David Brown Selectamatic tractors from a specific production era, crucial for preserving operational integrity and value. Competitors Of Era: Competed with tractors from manufacturers such as Massey Ferguson, Fordson, John Deere, International Harvester, and other British makes. Key Features Unique Selling Points: Covers the distinctive Selectamatic hydraulic system, extensive model year coverage (1970-1979), comprehensive repair procedures. Model Variants Covered: The manual aims to cover common David Brown Selectamatic tractor models produced within the 1970-1979 timeframe, such as the 770, 880, 990, 1200, 1400 series and their variants (e.g., Implematic, Comfortline). 📋 Manual Details Coverage Areas Applicable Years: 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979 Page Count Estimated Page Count: Likely over 500 pages (typical for comprehensive tractor workshop manuals of this era, specific count not provided in product info but inferred) Manual Type Manual Type: Complete Workshop Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Major Systems: Engine, Transmission (including Selectamatic system), Hydraulics, Steering, Brakes, Electrical System, Chassis, PTO, Rear Axle, Front Axle, Cooling System, Fuel System, Lubrication System Braking System: Mechanical drum brakes, parking brake system. Electrical System: Starting system (starter motor, battery), charging system (alternator/dynamo), lighting, ignition (if diesel glow plugs), instrumentation. Chassis And Body: Frame, front axle, rear axle, drawbar, fenders, operator controls, mounting points. Pto And Hydraulics: Power Take-Off (PTO) operation and maintenance, hydraulic pump, control valve, lift arms, linkage, hydraulic reservoir and filter. Procedures Included Repair And Maintenance: Detailed step-by-step repair instructions, routine maintenance procedures, troubleshooting guides, diagnostic information, overhaul procedures, component replacement, adjustments, specifications Engine Overhaul: Detailed steps for engine disassembly, inspection, repair, and reassembly, including piston and liner replacement, crankshaft, camshaft, valve train service. Transmission Repair: Complete overhaul of the gearbox, clutch, Selectamatic hydraulic unit, final drives, and differential. Troubleshooting Guides: Diagnostic procedures for common faults across all systems, symptom-based troubleshooting charts. Steering System Repair: Service and overhaul of the steering box, linkages, and potentially power steering components. Technical Depth Depth: Comprehensive: Covers everything from basic adjustments and fluid changes to full engine and transmission rebuilds, including specialized knowledge for the Selectamatic hydraulic system. Diagnostic Tools: Information on necessary special tools and basic diagnostic equipment for repairs. Torque Specifications: Precise torque values for all critical fasteners and engine/transmission components are essential for correct assembly. 📊 Manual Specifications File Format PDF Quality: Assumed high-resolution scans for clarity, searchable text is highly desirable for PDF manuals. Searchability: Typically, PDF downloads from reputable sources include OCR for text searching, greatly enhancing usability. Printability: PDF format allows users to print specific sections or the entire manual as needed. Print Quality Print Readability: Designed for clear reproduction in print, though delivery is digital. Image Clarity: Diagrams, illustrations, and photographs are expected to be clear enough for accurate identification of parts and procedures. Binding Type Binding Type: Not applicable (Digital PDF download) Paper Type Paper Type: Not applicable (Digital PDF download) ⚙️ Engine Specifications Primary Engine Engine Family: David Brown AD4/360 and DB 4-cylinder diesel engines (common in this era, specific models may vary within the Selectamatic range and years covered). Engine Bore And Stroke: Specific engine dimensions for the AD4/360 or other relevant DB engines will be provided in the manual. Performance Horsepower Range: Varies by model, typically ranging from 40 to 70 HP for common tractors of this period (e.g., 880, 990, 1200 series Selectamatics). Torque Figures: Torque output would be model-specific, crucial for heavy draft work, detailed in the manual. Fuel System Injection System: Likely Lucas or Simms inline fuel injection pumps. Fuel Type: Diesel fuel. Maintenance Cooling System Type: Pressurized coolant system with radiator, thermostat, water pump, and fan. 🔧 Transmission Standard Transmission Type: David Brown 'Selectamatic' hydraulic power transmission system with clutch and gearbox. Optional Optional Features: Some models may have had variations in gearbox ratios or power take-off (PTO) configurations. Features Selectamatic Operation: Hydraulic draft control, position control, and often variable engine speed control through the Selectamatic lever system. Gear Selection: Manual gear selection typically combined with the Selectamatic hydraulic power control for implement operation. 📐 Dimensions Exterior Tractor Footprint: Varies significantly by specific model (e.g., 880, 990, 1210, 1410 Selectamatic variants), but generally designed for agricultural use with standard track widths. Wheelbase: Varies by model, but critical for stability during field operations. Weights Operating Weight: Typically in the 4,000 - 7,000 lbs (1800 - 3200 kg) range for tractors in this series,...