🏷️ Basic Information Identification Make: Allis-Chalmers Model: D-21 Series II Vehicle Type: Tractor Codes Manual Product Name: Allis Chalmers Model D-21 series II Tractor All Service Repair Manual Download 👋 Introduction Market Position Target Audience: Tractor owners, independent mechanics, restoration enthusiasts. Key Features Benefits: Enables DIY repairs, cost savings, in-depth vehicle knowledge, convenience for anytime/anywhere repairs. Content Value: Provides detailed instructions for disassembly, reassembly, repair, servicing, and maintenance. 📋 Manual Details Coverage Areas Primary Coverage: Complete service and repair of the Allis-Chalmers Model D-21 Series II Tractor Secondary Coverage: General maintenance, troubleshooting, engine, transmission, brakes, electrical, suspension, lubrication, steering, cooling, fuel, emissions, engine control, chassis, body, restraints, axles. Page Count Estimated Page Count: Indeterminate (Digital Download) Manual Type Type: Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Service: Comprehensive repair and overhaul procedures for the engine. Transmission Service: Detailed service and repair for the transmission system. Brake System: Repair and maintenance of the tractor's braking system. Electrical System: Coverage of all electrical components and wiring. Suspension System: Service and repair information for the suspension components. Steering System: Procedures for steering system maintenance and repair. Cooling System: Detailed information on the cooling system's operation and repair. Fuel System: Service and repair of the fuel injection and fuel delivery systems. Emission Control: Information pertaining to emission control systems. Chassis Body: Repair and maintenance of the tractor's chassis and body components. Axle And Drive: Service procedures for the front and rear axles and drive components. Procedures Included Disassembly Reassembly: Step-by-step instructions for component disassembly and reassembly. Troubleshooting: Diagnostic procedures and solutions for common issues. Periodic Maintenance: Guidance on routine maintenance tasks and schedules. Lubrication: Specific lubrication points and fluid recommendations. Wiring Diagrams: Includes electrical wiring schematics for the tractor. Technical Depth Depth: Comprehensive, from basic maintenance to complete engine and transmission rebuilds. 📊 Manual Specifications File Format File Type: PDF Reader Requirement: Adobe PDF Reader Compression Requirement: WinZip (or equivalent) Compatibility Operating Systems: All versions of Windows & Mac Print Quality Quality: High-resolution, suitable for printing. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Diesel (typically Waukesha) Engine Displacement: Estimated 339.8 cubic inches (5.57 L) - requires specific engine variant confirmation. Performance Horsepower: Approx. 75 HP (drawbar) - varies by specific engine and tuning. Torque: Specific torque figures not readily available without model variant details, but expected to be substantial for heavy-duty work. Fuel System Injection System: Diesel Injection (likely Bosch or Simms, depending on exact configuration). Fuel Type: Diesel Fuel 🔧 Transmission Standard Transmission Type: Manual (likely a constant mesh gearbox with multiple forward and reverse gears). Features Gear Selection: Typically features a range splitter or gear splitting mechanism for optimal power delivery in various field conditions. 📐 Dimensions Weights Operating Weight: Approximately 9,000 - 10,000 lbs (4,082 - 4,536 kg) - varies with options. Wheelbase: Approx. 92 inches (2337 mm) - requires specific measurement. 🛡️ Safety Features Active Features Braking System Type: Typically internal expanding shoe brakes on the rear axle, often hydraulically actuated with a mechanical parking brake. Passive Features Operator Station: Open station design; roll-over protection systems (ROPS) may be an aftermarket or later addition, not standard from original manufacture for all units. 💡 Technology Features Infotainment Features: N/A (Tractor technology of the era focused on functionality, not infotainment). Driver Assistance Features: N/A (Tractor technology of the era focused on mechanical systems). Connectivity Features: N/A (Tractor technology of the era focused on mechanical systems). 🔧 Maintenance Service Intervals Engine Oil Change: Typically every 100-250 operating hours, depending on operating conditions and oil type. Transmission Oil Change: Refer to manual for specific interval, often around 500-1000 hours for heavy-duty transmissions. Fluid Specifications Engine Oil Type: API CD or MIL-L-2104B or equivalent (e.g., SAE 30 or 10W-30 depending on climate). Transmission Hydraulic Fluid: Allis-Chalmers HD-50 or equivalent (e.g., UTF - Universal Tractor Transmission Fluid, or specified hydraulic oil). Coolant: Ethylene glycol-based antifreeze mixed with distilled water (50/50 ratio). Known Issues Engine Performance: Potential for injector pump issues, carbon buildup in combustion chambers, and wear on piston rings/cylinder liners due to age and use. Transmission Shifting: Wear in gear selectors or synchros can lead to difficult shifting; clutch wear is common. Hydraulic System: Leaks from seals and hoses, and potential wear in the hydraulic pump or cylinders are common in older units. Electrical System Reliability: Deterioration of wiring insulation, corrosion on electrical connections, and starter/generator issues are frequent. 📚 Vehicle History Brand Heritage Manufacturer: Allis-Chalmers Model Evolution Series Designation: The D-21 was a high-horsepower tractor for its era, designed for heavier work. The 'Series II' indicates an updated or refined version. Production Production Period: The D-21 was produced from 1957 to 1962. The Series II likely falls within this period, likely later production...