Basic Information Identification Make: Allis-Chalmers Model: 616, 620, 720 Tractor Codes Product Code Identifier: Service Repair Manual Introduction Market Position Target Audience: Tractor owners, farm mechanics, repair shops, maintenance personnel Competitive Analysis Information Superiority: Provides the same authoritative information used by factory-trained technicians Key Features Clarity And Conciseness: Accurate, clear, and concise text for easy understanding Visual Aids: Detailed illustrations and comprehensive diagrams enhance understanding and repair accuracy Completeness Of Data: Includes all manufacturer specifications and technical information Manual Details Coverage Areas Coverage Scope: Comprehensive from bumper to bumper, diagnostics, repair, maintenance Page Count Estimated Pages: N/A (Digital Download) Manual Type Manual Classification: Factory Service Manual / Repair Manual Language Documentation Language: English Format Delivery Format: PDF Download Manual Coverage Systems Covered Engine Service: Detailed diagnostics, overhaul procedures, fuel system, lubrication system, cooling system, ignition/starting systems (if applicable) Transmission Service: Repair and overhaul of powershift, hydrostatic, or gear drive transmissions, clutch service, PTO operation Hydraulic System: Hydraulic pump, cylinder, valve body, filter, fluid specifications, troubleshooting, and repair Electrical System: Wiring diagrams, component testing, starter, alternator/generator, lighting, instrument panel Chassis And Drivetrain: Front axle, rear axle, differential, brakes (mechanical, hydraulic, disc/drum), steering system Operator Station And Body: Seat, controls, fenders, hood, linkage adjustments Procedures Included Routine Maintenance: Lubrication charts, filter replacement, fluid level checks, greasing points Diagnostic Troubleshooting: Systematic diagnostic flowcharts, symptom-based troubleshooting guides Component Overhaul: Step-by-step instructions for rebuilding engines, transmissions, hydraulic pumps, and other major components Adjustment And Calibration: Valve lash adjustment, brake adjustment, hydraulic pressure calibration, timing adjustments Disassembly And Assembly: Detailed instructions for removing, inspecting, repairing, and reinstalling parts and assemblies Technical Depth Diagnostic Capability: Advanced, suitable for professional technicians and experienced mechanics Repair Scope: Complete, covering routine maintenance to major component overhauls and rebuilds Information Detail: Detailed illustrations, diagrams, specifications, torque values, clearances, and tolerances Manual Specifications File Format PDF Quality: High resolution, searchable text, printable pages Print Quality Scalability: Printable at original document size and quality Binding Type Digital Format Binding: N/A (Digital Download) Paper Type Digital Medium: N/A (Digital Download) Engine Specifications Primary Engine Make Model: Likely Waukesha, Continental, or similar industrial engines common in Allis-Chalmers tractors of the era. Specific engine model to be detailed within the manual. Performance Displacement Range: To be specified in manual, typically in the 1.0L to 2.0L range for 3-cylinder models, larger for 4-cylinder variants. Horsepower Range: Typically 15-30 PTO HP, depending on specific model variant (616, 620, 720). Fuel System Fuel Type: Diesel (most likely for these models), possibly gasoline for some variants. Injection System: Typically direct injection or indirect injection with rotary or inline injection pumps (e.g., Bosch, CAV, Stanadyne). Cooling System Cooling Type: Liquid-cooled, pressurized system. Lubrication System Oil Type: Diesel engine oil, e.g., API CD/CE or equivalent, viscosity grade dependent on ambient temperature (e.g., SAE 30, 10W-30, 15W-40). Specific recommendation in manual. Transmission Standard Type: Likely a 3-speed or 4-speed manual transmission with a range selector (e.g., 8-speed or 12-speed). Some models may have offered hydrostatic transmissions. Optional Transmission Options: Hydrostatic transmission (HST) may be an option on certain 600/700 series models. PTO options may vary. Features Powershift Capabilities: Typically not a powershift; standard manual or hydrostatic. Power Take Off Pto: Live PTO or transmission-driven PTO, likely 540 RPM standard. Fluid Specifications Transmission Oil Type: Tractor Hydraulic Fluid (THF) or Universal Tractor Transmission Oil (UTTO) conforming to specifications like John Deere J20C/J20D, or specific Allis-Chalmers THF. Manual will specify. Dimensions Exterior Overall Length: To be specified in manual. Varies by model, typically around 100-120 inches. Overall Width: To be specified in manual. Varies by model, typically around 50-60 inches at rear wheels. Wheelbase: To be specified in manual. Varies by model, typically around 65-75 inches. Weights Operating Weight: To be specified in manual. Likely in the 2000-3000 lb range. Drawbar Pull: To be specified in manual. Dependent on tractor weight and traction. Safety Features Ratings Rollover Protective Structure Rops: ROPS may have been an option or standard depending on model year and market. Manual will detail any factory-fitted ROPS requirements or testing. Active Features Brake System: Mechanical or hydraulic internal expanding shoe brakes, often with independent rear brake operation and park brake function. Passive Features Operator Presence Control: Likely feature: clutch pedal interlock, PTO engagement interlock. Lighting: Headlights, taillights, brake lights, and work lights as per standard agricultural tractor regulations of the era. Technology Features Infotainment Operator Interface: Basic dashboard with key indicators: oil pressure, temperature, ammeter/voltmeter, fuel level. No modern infotainment systems. Driver Assistance Advanced Features: None typically found on these models beyond basic tractor safety interlocks. Connectivity Communication Systems: N/A Maintenance Service Intervals Engine Oil Change: Typically every 50-100 operating hours or annually, whichever comes first. Specific interval detailed in manual. Transmission Fluid Change: Typically every 200-400 operating hours or annually. Specific interval and filter change frequency detailed in manual. Hydraulic Fluid...