The Yanmar YM155 and YM155D tractors represent reliable and efficient compact utility machines, designed by a manufacturer with a strong heritage in agricultural innovation. These diesel-powered tractors, typically in the 15-20 HP range, are built for a variety of tasks on small to medium-sized farms and properties. Their robust construction, coupled with Yanmar's reputation for quality engineering, ensures dependable performance for demanding work. The YM series tractors are characterized by their practical design, focusing on essential functionality and ease of operation for agricultural professionals and property owners alike. This comprehensive service repair workshop manual provides in-depth technical information for the Yanmar YM155 and YM155D tractors. It covers all major systems, including the engine, transmission, hydraulics, electrical components, and chassis. The manual details scheduled maintenance, diagnostic procedures, and step-by-step repair instructions for everything from routine fluid changes to complete engine overhauls. With detailed specifications, torque values, wiring diagrams, and troubleshooting charts, this manual is an indispensable resource for independent mechanics, farm owners, and anyone seeking to maintain or repair these Yanmar tractors to factory standards. 🏷️ Basic Information Identification Make: Yanmar Model: YM155 / YM155D Product Type: Tractor Service Repair Workshop Manual 👋 Introduction Market Position Target Audience: Independent mechanics, farm owners, agricultural professionals, and DIY enthusiasts with mechanical aptitude seeking factory-level repair information. Competitive Analysis Advantage: Provides vehicle-specific, dealer-level technical data, ensuring accuracy and completeness unlike generic repair guides. Key Features Content Highlight: Includes step-by-step instructions, detailed diagrams, illustrations, wiring schematics, and essential specifications for diagnosis and repair. 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive service, repair, and troubleshooting for Yanmar YM155 and YM155D tractors. Page Count Estimated Page Count: Varies by specific edition, but designed to be comprehensive. Typical for workshop manuals of this era and complexity can range from 300-800+ pages. Manual Type Type: Service Repair Workshop Manual Language Language: English Format Digital Format: PDF 📖 Manual Coverage Systems Covered Engine: Engine overhaul, troubleshooting, fuel system, cooling system, lubrication system, ignition/starting system, emissions control (if applicable). Transmission: Manual and/or powershift transmission repair, clutch system, drivetrain components (propshafts, differentials, axles). Hydraulics: Hydraulic system components, pump, cylinder, control valves, power take-off (PTO) hydraulics, hitch control. Electrical: Wiring diagrams, charging system, starting system, lighting, gauges, starter motor, alternator, battery service. Chassis And Body: Frame, front axle, steering system, braking system, wheels, tires, body panels, operator station, fenders. Steering System: Mechanical steering system, linkage, tie rods, steering arms, and potential power steering components (if equipped). Specific lubrication and adjustment points. Braking System: Detailed procedures for brake shoe inspection, adjustment, relining, and pedal free play. Cooling System: Radiator, fan, water pump, thermostat, hoses, and coolant recovery system diagnosis and repair. Exhaust System: Muffler, exhaust manifold, and pipe inspection and replacement. Operator Controls: Detailed explanation and repair procedures for steering wheel, brake pedals, clutch pedal, gear levers, throttle control, and PTO engagement. Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, lubrication points, inspections. Troubleshooting: Diagnostic procedures for common and uncommon issues, symptom-based troubleshooting charts. Repair: Step-by-step repair instructions for all major components and systems, including disassembly, cleaning, inspection, and reassembly. Adjustment: Precise adjustment procedures for engine timing, valve clearance, brake systems, clutch engagement, and hydraulic controls. Engine Rebuild: Comprehensive engine overhaul procedures, including cylinder head removal/installation, piston and ring replacement, crankshaft and bearing service, camshaft and valve train servicing. Hydraulic Component Service: Detailed disassembly, inspection, and reassembly of hydraulic pump, control valves, cylinders, and filters. Includes troubleshooting for common hydraulic faults. Wiring Harness Repair: Instructions for tracing and repairing faults within the tractor's electrical wiring harness, including connector identification. Technical Depth Depth: Detailed technical specifications, torque values, clearances, tolerances, and diagnostic data equivalent to dealer-level service. Diagnostic Charts: Includes comprehensive diagnostic charts that correlate symptoms to potential causes and repair procedures. Schematics: Clear, detailed wiring diagrams and hydraulic schematics for accurate troubleshooting and repair of electrical and hydraulic systems. 📊 Manual Specifications File Format Readability: Optimized for viewing on PC, Mac, and compatible mobile devices/e-readers, ensuring clarity and legibility. Print Quality Printable: Yes, individual pages can be printed for on-the-job use, allowing users to keep originals clean. Binding Type Binding Description: Digital format (PDF) eliminates the need for traditional binding; printable pages offer flexibility. Paper Type Paper Type Description: N/A (Digital Format) - Printing allows for user choice of paper type for durability. ⚙️ Engine Specifications Primary Engine Engine Model: Typically Yanmar 3T72 Series (or similar displacement diesel engine for this class of tractor). Specific engine code would be present in the manual. Performance Horsepower Range: Likely in the 15-20 HP range, depending on specific configuration (e.g., YM155 vs. YM155D which often indicates 2WD vs. 4WD and potentially slight power variations). Fuel System Fuel Type: Diesel Injection System: Direct injection, rotary or inline injection pump. Manual will detail specific pump type and timing. Cooling System Cooling Type: Liquid-cooled (radiator, fan, coolant pump)....