🏷️ Basic Information Identification Make: John Deere Model: 720 Product Type: Service Repair Manual Vehicle Type: Diesel Tractor 👋 Introduction Market Position Historical Context: The John Deere 720 was a significant model in its era, representing a robust and versatile tractor for agricultural and industrial applications. Competitive Analysis Industry Standing: Competed with other major tractor manufacturers, known for its durability and power. Key Features Engine Type: Two-cylinder diesel engine, a hallmark of John Deere's design at the time. Power Take Off: Provided PTO capabilities for driving various implements. Hydraulic Lift: Featured a robust hydraulic system for operating 3-point hitches and other powered implements. 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive service and repair procedures for the John Deere 720 Diesel Tractor. Secondary Coverage: Maintenance schedules, troubleshooting guides, specifications, and diagrams. Page Count Estimated Page Count: Likely over 500 pages, typical for comprehensive service manuals of this era. Manual Type Manual Classification: Service Repair Manual (SRM) Language Primary Language: English Format Digital Format: PDF (commonly available for this type of historical document). Physical Format: Print (available through specialized publishers). 📖 Manual Coverage Systems Covered Engine System: Detailed breakdown, overhaul, troubleshooting, and repair of the diesel engine. Fuel System: Injection pump, injectors, fuel lines, filters, and related components. Cooling System: Radiator, fan, thermostat, water pump, and coolant specifications. Lubrication System: Oil pump, filter, passages, and lubrication requirements. Electrical System: Starting system, charging system, lighting, wiring diagrams, and component testing. Transmission System: Gearbox, clutch, PTO (Power Take-Off) operation and repair. Hydraulics System: Hydraulic pump, control valves, lift arms, cylinders, and fluid specifications. Steering System: Mechanical or power steering mechanisms, linkage, and adjustments. Brake System: Brake mechanisms, linkage, adjustments, and fluid types. Chassis And Frame: Frame integrity, front axle, rear axle assembly, and wheel mounting. Power Take Off Pto: PTO engagement, clutch, and drive shaft maintenance. Procedures Included Routine Maintenance: Oil changes, filter replacements, lubrication points, belt adjustments, battery maintenance. Troubleshooting: Diagnostic procedures for common engine, hydraulic, and electrical issues. Engine Overhaul: Step-by-step instructions for engine disassembly, inspection, repair, and reassembly. Transmission Repair: Clutch service, gear replacement, and gearbox assembly procedures. Hydraulic System Repair: Pump testing, valve body repair, cylinder seal replacement, and system bleeding. Electrical Diagnostics: Testing of starter, alternator, wiring harnesses, and ignition components. Brake Adjustment And Service: Procedures for adjusting and servicing drum or disc brakes. Timing Adjustment: Precise procedures for setting engine injection timing. Governor Service: Inspection, adjustment, and repair of the engine's speed governor. Technical Depth Diagnostic Capabilities: Detailed diagnostic flowcharts and symptom-based troubleshooting. Rebuild Instructions: Comprehensive rebuild procedures for major components like the engine and transmission. Specifications And Tolerances: Precise measurements, clearances, and torque values for all mechanical parts. Diagrams And Illustrations: Exploded views, cutaway drawings, and wiring schematics. Component Identification: Clear identification of all parts with part numbers and descriptions. 📊 Manual Specifications File Format Digital Quality: High-resolution scans or digital renderings, often searchable text. Print Quality Print Standard: Professional print quality with clear text and detailed images. Binding Type Print Binding: Often coil-bound or perfect-bound for durability and lay-flat usability. Paper Type Print Paper: Durable, heavy-stock paper resistant to grease and workshop conditions. ⚙️ Engine Specifications Primary Engine Engine Model: John Deere 2-cylinder Diesel (specific model designation may vary, e.g., 4.3L or similar displacement for the era). Engine Type: Vertical, liquid-cooled, two-cylinder, four-stroke diesel. Bore Stroke: Specific dimensions would be detailed in the manual, e.g., 4.5625 in x 5.5 in. Displacement: Approximately 265 cubic inches (4.3 liters). Performance Horsepower Rated: Typically around 68-72 PTO horsepower (actual figures vary by specific configuration and drawbar vs. PTO). Torque Rated: Specifications would be detailed, emphasizing strong low-end torque characteristic of diesel engines. Fuel System Injection System: Roosamaster or similar inline injection pump. Fuel Type: Diesel Fuel. Fuel Filter Part Number: Specific John Deere or aftermarket part numbers would be listed (e.g., RE12620 or equivalent). 🔧 Transmission Standard Transmission Type: Constant mesh, sliding gear transmission. Gear Configurations: Typically offered with 6 forward speeds and 2 reverse speeds. Optional Power Director Option: Some models may have featured a Power Director (high-low range) for increased versatility. Features Clutch Type: Dry, dual-stage clutch (one for transmission engagement, one for PTO engagement). 📐 Dimensions Exterior Wheelbase: Approx. 90-93 inches (specific to standard configuration). Overall Length: Approx. 140-150 inches (without implement). Weights Operating Weight: Approx. 7,000 - 8,000 lbs (unballasted). 🔧 Maintenance Service Intervals Engine Oil Change: Typically every 100-150 operating hours or annually. Fuel Filter Replacement: As needed, or every 250-300 operating hours. Air Cleaner Service: Check daily, service as needed based on operating conditions. Fluid Specifications Engine Oil Type: John Deere Plus-50 or equivalent API CJ-4 rated diesel engine oil (SAE 15W-40 or 10W-30 depending on climate). Hydraulic Fluid Type: John Deere Hy-Gard™ or compatible Type 303 Specification fluid. Transmission Fluid Type: Often shared with hydraulic fluid, check manual for specific recommendation...