🏷️ Basic Information Identification Make: Allis-Chalmers Model: D-21, D-21 Series II, Two-Ten (210), Two-Twenty (220) 👋 Introduction Market Position Target User: Tractor owners, mechanics, service technicians, agricultural enthusiasts Competitive Analysis Completeness: Market-leading completeness, described as 'best most complete awesome' Key Features Instant Access: Instant Download, No Waiting 📋 Manual Details Coverage Areas Manual Type: Service/Shop Repair Manual Language: English Format: PDF (Searchable, Bookmarked, Indexed) Page Count Estimated Pages: Likely several hundred pages, given the depth of coverage for multiple models and systems. Exact count not provided but described as 'most complete'. 📖 Manual Coverage Systems Covered Engine: Complete engine overhaul, tuning, troubleshooting, specifications Fuel System: Diesel fuel system diagnosis, repair, injection pump, injectors, filters Cooling System: Radiator, water pump, thermostat, cooling fan, system flush and maintenance Electrical System: Wiring diagrams, starter, generator/alternator, battery, lighting, ignition system Transmission: Internal components, gears, bearings, seals, lubrication, shifting mechanisms Clutch: Clutch operation, adjustment, replacement of components Brakes: Brake system diagnosis, hydraulic components, adjustment, relining Steering System: Steering linkage, steering box, hydraulic steering components, maintenance Front System: Front axle, kingpins, wheel bearings, front wheel drive (if applicable) Differential And Final Drive: Rear axle housing, differential gears, pinion, final drive components, lubrication Power Lift System: Hydraulic lift operation, pump, control valve, cylinders, linkages Power Steering: Hydraulic power steering system components, diagnosis, and repair Power Take Off: PTO mechanism, engagement, disengagement, maintenance Procedures Included Maintenance: Routine maintenance, lubrication schedules, fluid changes, filter replacements Troubleshooting: Diagnostic procedures for common and uncommon issues across all systems Repair: Detailed step-by-step repair instructions for component overhaul and replacement Assembly Disassembly: Comprehensive instructions for component removal and reinstallation Technical Depth Depth: Comprehensive (from basic tune-ups to full engine and transmission rebuilds) 📊 Manual Specifications File Format Searchable Text: Yes Bookmarks: Yes (Fully Bookmarked Chapters) Index: Yes (Indexed) Printable: Yes (Print entire manual or specific sections) Compatibility: Windows & Mac OS Print Quality Illustrations Quality: Detailed, high-quality (Diagrams, Exploded Views, Photos) ⚙️ Engine Specifications Primary Engine Engine Type: Diesel (Specific engine details would be within the manual's 'Engine' section) Performance Horsepower Range: Typically in the 60-80 HP range for this class of tractor (specifics vary by model and year within the manual) Torque Characteristics: Designed for high torque at low RPM for agricultural work (specifics in manual) Fuel System Fuel Type: Diesel Fuel Injection System: Direct Injection, governed by Bosch or similar reputable manufacturer (details in manual) 🔧 Transmission Standard Transmission Type: Likely a gear-drive transmission with multiple forward and reverse speeds (specifics detailed in manual) Features Gear Selection: Manual gear shifting, potentially with a Hi-Lo range selector or powershift options depending on specific model variant (covered in manual) 📐 Dimensions Weights Operating Weight: Typically 6,000-8,000 lbs (specifics would be in Service Data section of manual) Wheelbase: Refer to 'Service Data' section in manual for exact measurements 🛡️ Safety Features Active Features Braking System: Drum or disc brakes, depending on specific model configuration (detailed operation and maintenance in manual) Passive Features Operator Station: Standard operator station, often with ROPS (Roll-Over Protective Structure) as an option or standard depending on year and market (manual covers related adjustments/checks) 💡 Technology Features Infotainment Operator Interface: Basic mechanical controls and gauges; no modern infotainment systems. Driver Assistance Features: Focus on mechanical and hydraulic systems for power steering and lift, not electronic driver assistance. 🔧 Maintenance Service Intervals Engine Oil Change: Typically every 100-250 operating hours, or annually (exact specification in manual). Transmission Fluid Change: Refer to manual for specific intervals and recommended fluid type (e.g., SAE 80W-90 or similar). Lubrication Points: Extensive lubrication schedule for pivot points, bearings, linkages (detailed charts and grease types in manual). Fluid Specifications Engine Oil Type: API CD or equivalent diesel engine oil, viscosity grade based on ambient temperature (refer to manual for precise specification). Hydraulic Fluid Type: Allis-Chalmers HD Oil, UTF (Universal Tractor Transmission Fluid), or equivalent; specific viscosity and additive package detailed in manual. Known Issues Common Wear Points: Clutch wear, hydraulic system leaks, front axle kingpin wear, engine seal leaks are common in older tractors and covered in troubleshooting. Electrical System Reliability: Older wiring harnesses can degrade; manual provides diagrams for repair and replacement. 📚 Vehicle History Brand Heritage Manufacturer: Allis-Chalmers Manufacturing Company, a significant American manufacturer of agricultural machinery and industrial equipment. Model Evolution Series Development: The D-21 and its successors (Series II, 210, 220) represent Allis-Chalmers' efforts in the higher horsepower utility tractor segment during their production era. Production Production Era: Mid to late 1960s through the 1970s (specific years for each variant are detailed in the manual's historical context).