This manual covers the David Brown 850, 880, 950, and 990 Series Implematic tractors, produced from the late 1950s through the 1960s and into the early 1970s. These robust machines, manufactured by David Brown Tractors Ltd. in Huddersfield, England, are known for their reliable engineering and the innovative Implematic hydraulically assisted transmission system, designed to enhance operational ease and efficiency in agricultural tasks. This series of tractors features four-cylinder diesel engines, typically producing between 40-60 HP, and are equipped with constant mesh gearboxes, live PTO, and heavy-duty rear axles. This comprehensive Factory Service Repair Workshop Manual provides detailed guidance for owners, mechanics, and technicians. It encompasses a wide array of critical systems, including the engine, fuel, cooling, lubrication, transmission and drivetrain, hydraulic system, electrical components, brakes, steering, and chassis. The manual offers step-by-step instructions for maintenance, diagnostics, troubleshooting, and repair operations, including engine rebuilds and transmission overhauls. With hundreds of pages of information, complete with diagrams and photos, this English-language manual is an essential resource for maintaining and repairing these classic David Brown tractors. 🏷️ Basic Information Identification Make: David Brown Model: 850, 880, 950, 990 Series Implematic Product Type: Service & Repair Workshop Manual 👋 Introduction Market Position Target Audience: David Brown tractor owners, mechanics, technicians, restoration enthusiasts Competitive Analysis Value Proposition: Provides professional-level repair and maintenance information for a broad range of David Brown Implematic models, enabling self-sufficiency in upkeep and repairs. Key Features Content Quality: Factory-level detail with hundreds of pages of information, including photos and diagrams. Accessibility: Instant PDF download for immediate access on various devices. 📋 Manual Details Coverage Areas Vehicles Covered: David Brown 850 Implematic, David Brown 880 Implematic, David Brown 950 Implematic, David Brown 990 Implematic Engine Variants Covered: Diesel (specific engine codes to be detailed in manual) Page Count Estimated Pages: Hundreds (exact count not specified but described as very detailed with hundreds of pages) Manual Type Type: Factory Service Repair Workshop Manual Language Language: English Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine Service: Complete overhaul, diagnostics, tuning, component replacement Fuel System: Fuel injection pump, injectors, fuel lines, filters, bleeding procedures Cooling System: Radiator, thermostat, water pump, hoses, coolant specifications Lubrication System: Oil pump, oil filter, oil pressure, oil specifications and capacities Transmission And Drivetrain: Gearbox, differential, rear axle, PTO (Power Take-Off), Implematic hydraulics Hydraulic System: Implement control system, hydraulic pump, valves, cylinders, fluid specifications Electrical System: Starter motor, alternator, battery, lighting, wiring diagrams, ignition system (if applicable) Braking System: Brake operation, adjustments, fluid specifications Steering System: Steering box, linkage, adjustments Chassis And Suspension: Front axle, steering components, rear axle housing Bodywork And Fittings: Fenders, seat, controls, dashboard components Procedures Included Maintenance: Scheduled servicing, oil changes, filter replacements, lubrication points, general upkeep Troubleshooting: Diagnostic charts, fault finding for all major systems, common problems and solutions Repair Operations: Step-by-step instructions for component removal, overhaul, and reassembly Engine Rebuild: Detailed procedures for dismantling, inspecting, and rebuilding the engine Hydraulic System Repair: Repair of hydraulic pump, valves, rams, and control mechanisms Transmission Overhaul: Procedures for gearbox, differential, and PTO unit repairs Electrical Diagnostics: Troubleshooting electrical faults using wiring diagrams and test procedures Technical Depth Depth: Comprehensive (covers all repairs, servicing, and troubleshooting procedures) Detail Level: High (detailed photos, diagrams, exploded views, step-by-step instructions) Torque Specifications: Essential torque values for all critical fasteners will be included. Clearances: Engine valve clearances, bearing clearances, gear backlash, etc. will be specified. Timing Specifications: Engine timing procedures and specifications will be detailed. 📊 Manual Specifications File Format Format: PDF Searchability: Likely searchable text-based PDF (standard for professional manuals) Print Quality Print Capability: Print single pages or entire manual Compatibility Operating Systems: Windows and MAC computers Licensing Usage License: Unlimited use on multiple devices, no expiry ⚙️ Engine Specifications Primary Engine Engine Type: Four-cylinder, direct-injection diesel engine (specific engine families like AD4.177, AD4.203, etc. likely covered) Performance Horsepower Range: Varies by model, typically 40-60 HP (exact figures per model and series variant to be confirmed in manual) Torque Range: Varies by model, designed for agricultural applications (specific figures to be confirmed in manual) Fuel System Injection System: Bosch or CAV fuel injection pumps (specific types to be detailed) Fuel Type: Diesel 🔧 Transmission Standard Gearbox: Constant mesh gearbox with multiple forward and reverse gears (e.g., 10 forward, 2 reverse) Features Implematic Transmission: Unique David Brown hydraulically assisted transmission system for clutch operation and implement control (detailed operation and servicing covered) Pto: Live PTO, 540 RPM (typical, specific configurations may vary) Rear Axle: Heavy-duty rear axle with differential lock (manual engagement) 📐 Dimensions Exterior Wheelbase: Varies by model and configuration (specifics in manual) Weights Operating Weight: Approximately 4,000 - 5,500 lbs (1800 - 2500 kg) depending on model and configuration 💡 Technology Features Infotainment Features: Basic tractor instrumentation: Tachometer, oil pressure gauge, water temperature gauge, ammeter. No modern infotainment....