🏷️ Basic Information Identification Make: Mercedes-Benz Model: Unimog Series: 404 Model Codes: 404.0, 404.1 Production Years Covered: 1955-1980 👋 Introduction Market Position Vehicle Class: Off-road utility vehicle, military and civilian applications. Segment: Heavy-duty, all-terrain, specialist vehicle. Competitive Analysis Competitors: Historically, few direct competitors due to its unique design and capabilities. Vehicles like Land Rover Wolf, Pinzgauer, and specific military trucks could be considered in some contexts. Key Features Unique Selling Points: Exceptional off-road capability, robust construction, portal axles, high ground clearance, potential for various body configurations and PTO applications. Manual Value Proposition Target Audience: Unimog owners, mechanics specializing in Mercedes-Benz vehicles, collectors, and restoration specialists. Benefit: Enables accurate and efficient maintenance, troubleshooting, and repair, preserving the vehicle's legendary performance and longevity. 📋 Manual Details Coverage Areas Overall Coverage: Comprehensive factory service and repair for all aspects of the Unimog 404 series. Geographic Scope: Global (reflecting original Mercedes-Benz documentation scope) Page Count Estimated Page Count: Hundreds (stated as such in product description) Manual Type Type: Factory Service Repair Workshop Manual Language Language: Likely English (based on product description language, original may vary) Format Format: Downloadable PDF 📖 Manual Coverage Systems Covered Engine: Detailed maintenance, troubleshooting, and repair for gasoline and diesel engines (specific variants will be detailed within). Transmission: Service and repair of gearbox, transfer case, and ancillary drivetrain components. Axles And Differentials: Inspection, maintenance, and overhaul procedures for portal axles and locking differentials. Brakes: Service and repair for hydraulic brake systems, including drums, lines, and master cylinder. Suspension And Steering: Maintenance and repair of springs, shock absorbers, steering linkages, and steering gear. Electrical System: Troubleshooting and repair of all electrical circuits, including lighting, ignition, starting, and charging systems. Fuel System: Service and repair for fuel tanks, pumps, lines, and carburetors (for gasoline variants). Cooling System: Maintenance and repair of radiators, water pumps, thermostats, and hoses. Exhaust System: Inspection and replacement of exhaust components. Chassis And Frame: Inspection and repair of the frame and chassis structure. Bodywork: Repair and maintenance procedures for cab and body panels. Hydraulics: Service and repair for hydraulic systems, including PTO, implement hydraulics, and power steering (if applicable). Power Take Off Pto: Detailed information on PTO operation, maintenance, and repair. Procedures Included Preventative Maintenance: Scheduled maintenance tasks, lubrication, and fluid level checks. Troubleshooting: Systematic diagnostic procedures for identifying and resolving common and complex issues. Routine Repairs: Step-by-step instructions for common repair tasks. Major Overhauls: Detailed procedures for complete engine, transmission, and axle rebuilds. Component Replacement: Instructions for replacing individual parts and sub-assemblies. Adjustment Procedures: Specifications and methods for adjusting critical components like brakes and clutch. Technical Depth Depth: Extremely high: Suitable for professional mechanics and advanced DIY technicians. Diagnostic Capability: Encompasses advanced diagnostic trees and fault code interpretation (where applicable). Diagrams And Illustrations: Hundreds of detailed photos and exploded diagrams for precise assembly and disassembly. 📊 Manual Specifications File Format Format: PDF Compatibility: Windows and macOS compatible Searchability: Assumed searchable text due to PDF format (dependent on original scanning quality). Print Quality Printability: Printable (single pages or entire manual) Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) Licensing Usage Rights: Unlimited use, no expiry, can be used on multiple devices. ⚙️ Engine Specifications Primary Engine Gasoline Engine Code Example: M180 (inline-six gasoline) Displacement Gasoline: Approx. 2.2 to 3.0 Liters (depending on specific variant) Horsepower Gasoline Approx: 80-100 HP (depending on variant) Primary Engine Diesel Engine Code Example: OM312 (inline-four diesel) Displacement Diesel: Approx. 4.6 Liters Horsepower Diesel Approx: 60-70 HP (depending on variant) Performance Torque Characteristics: Emphasis on low-end torque for off-road traction and pulling power. Fuel System Gasoline Fuel System: Carbureted (e.g., Solex, Zenith) Diesel Fuel System: Injection pump and injectors 🔧 Transmission Standard Gearbox: Manual transmission with multiple forward and reverse gears, often featuring a crawler gear. Transfer Case: 2-speed transfer case with selectable 4WD and differential locking capabilities. Features Clutch Type: Single dry-plate clutch Gear Ratios: Specific gear ratios provided for each gear and transfer case range within the manual. 📐 Dimensions Exterior Wheelbase Approx: 2150 mm to 2700 mm (depending on variant) Ground Clearance Approx: Over 400 mm (significantly high) Weights Curb Weight Approx: 2500 - 3500 kg (depending on configuration) Payload Capacity Approx: Up to 2000 kg (depending on variant) 🛡️ Safety Features Ratings Crash Test Ratings: Not applicable to original era and vehicle type; emphasis on inherent ruggedness and operational safety. Active Features Traction Control: Achieved through selectable 4WD, differential locks, and portal axles. Passive Features Rollover Protection: Robust cab structure and provision for roll-over protection (ROPS) depending on specific military configurations. 💡 Technology Features Infotainment Infotainment System: Basic; primarily functional radio (if fitted) and instrumentation. No advanced digital systems. Driver Assistance Driver Assistance Features: None typically fitted in the modern sense. Driver reliance on vehicle control and terrain awareness. Connectivity Connectivity Features: None. 🔧 Maintenance Service...