The David Brown 1390 Tractor represents a robust and reliable piece of agricultural machinery, produced likely between the late 1970s and early 1980s. As part of the David Brown 100/1200 series, this mid-range utility tractor was engineered with a focus on durability and performance, featuring a typically 4-cylinder diesel engine with approximately 70-75 PTO horsepower. Its design emphasizes mechanical functionality, with a 12-speed constant mesh gearbox and a dual-stage clutch for transmission and PTO engagement. The tractor's sturdy build, with an operating weight around 6,000-7,000 lbs, makes it suitable for a wide range of farm operations, reflecting the quality and engineering heritage of David Brown Tractors Ltd. This Factory Service Repair Manual provides comprehensive information for the service and repair of the David Brown 1390 Tractor. It covers essential maintenance procedures, including routine and preventative tasks, alongside detailed troubleshooting guides for diagnosing and resolving mechanical, hydraulic, and electrical issues. The manual offers in-depth repair instructions and overhaul procedures for major components such as the engine, transmission, and hydraulic system, as well as specific guidance on adjustments and torque specifications. This resource is invaluable for farm owners, mechanics, and technicians seeking to maintain optimal performance, extend the lifespan, and reduce repair costs for their David Brown 1390 Tractor. 🏷️ Basic Information Identification Make: David Brown Model: 1390 Tractor Product Name: David Brown 1390 Tractor Factory Service Repair Manual 👋 Introduction Market Position Target Audience: Farm owners, mechanics, technicians, collectors of David Brown tractors Competitive Analysis Value Proposition: Provides comprehensive, factory-accurate repair and maintenance information to reduce repair costs and extend tractor lifespan. Key Features Diagnostic Capabilities: Includes troubleshooting guides for identifying and rectifying common and complex issues. Maintenance Planning: Offers detailed maintenance schedules to ensure optimal performance and longevity. Accessibility: Digital PDF format allows for quick downloading and on-demand access across multiple devices. 📋 Manual Details Coverage Areas Primary Coverage: Service and Repair of David Brown 1390 Tractor Secondary Coverage: Troubleshooting, Maintenance, Diagnostics Page Count Estimated Page Count: Variable, typically 300-800 pages for comprehensive tractor manuals Manual Type Type: Factory Service Repair Manual Language Language: English Format Format: PDF (Downloadable) 📖 Manual Coverage Systems Covered Engine Service: Full engine overhaul, diagnostics, component replacement, tuning Fuel System: Injection pump, injectors, fuel lines, filters, troubleshooting Cooling System: Radiator, thermostat, water pump, hoses, fan, troubleshooting Lubrication System: Oil pump, oil filter, oil passages, pressure testing Transmission Powertrain: Gearbox, clutch, PTO, differential, final drives, troubleshooting, overhaul Hydraulic System: Hydraulic pump, control valve, lift arms, cylinders, hydraulic fluid specifications, troubleshooting Electrical System: Wiring diagrams, starter, alternator, battery, lighting, instrument panel, troubleshooting Braking System: Brake operation, adjustment, repair, fluid specifications Steering System: Power steering, linkages, troubleshooting Front Axle And Suspension: Components, maintenance, repair Rear Axle And Hubs: Maintenance, bearing adjustments, repair Bodywork And Chassis: Fenders, hood, operator platform, frame inspection Operator Controls: Description and function of all controls, dashboard indicators, and warning lights. Procedures Included Routine Maintenance: Oil changes, filter replacements, lubrication points, daily checks Preventative Maintenance: Scheduled service intervals, component inspections Troubleshooting Guides: Diagnostic procedures for common and complex issues Repair Instructions: Step-by-step guides for component replacement and overhaul Overhaul Procedures: Complete rebuild instructions for major components like the engine and transmission Adjustments: Engine timing, clutch, brakes, hydraulics Wiring Diagrams: Detailed electrical schematics for troubleshooting and repair Torque Specifications: Essential torque values for critical fasteners during assembly and disassembly. Technical Depth Depth: Comprehensive factory-level service and repair information Diagnostic Level: Advanced diagnostics and troubleshooting of mechanical, hydraulic, and electrical systems Rebuild Level: Detailed instructions for complete engine, transmission, and hydraulic system rebuilds 📊 Manual Specifications File Format Format: PDF Compatibility: Compatible with all Windows & Mac versions Software Requirements: Adobe PDF Reader, WinZip Print Quality Quality: High-resolution scans for clear text and diagrams Binding Type Type: N/A (Digital PDF) Paper Type Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Model: Likely a David Brown AD4/55 or similar Perkins-based diesel engine (specific to 1390 series) Engine Type: Diesel Cylinders: Typically 4-cylinder Displacement: Approximately 3.9 Liters (236 cu in) - specific to AD4/55 Performance Horsepower Rated: Around 70-75 PTO horsepower (specific rating may vary) Torque Peak: Specifications vary; typically in the range of 200-230 lb-ft (approx.) Fuel System Injection System: Direct Injection, likely Lucas or CAV rotary fuel injection pump Fuel Type: Diesel Fuel 🔧 Transmission Standard Type: David Brown (or Spicer) 12-speed constant mesh gearbox with 4 forward and 2 reverse gears in each of three ranges, plus creeper gear option. Optional Type: Possible power take-off (PTO) options: 540/1000 RPM Features Clutch: Dual-stage clutch for transmission and PTO engagement. 📐 Dimensions Exterior Wheelbase: Approx. 80-84 inches (2030-2130 mm) Length: Approx. 125-135 inches (3175-3430 mm) Width: Approx. 68-72 inches (1725-1830 mm) at rear track Weights Operating Weight: Approx. 6,000-7,000 lbs (2720-3175 kg) 🛡️ Safety Features Ratings Rollover Protection: ROPS (Roll-Over Protective Structure) may be an optional...