Target Audience:
Owners, operators, mechanics, and service technicians performing maintenance, repair, and overhaul of Allis-Chalmers AC 616, 620, and 720 tractors.
Utility:
Designed for utility farm work, landscaping, property maintenance, and light agricultural tasks.
Value Proposition:
Provides essential, detailed technical information crucial for maintaining and repairing these specific tractor models, often hard to find in original print. The digital format offers instant access and searchability.
Features:
Instant download, detailed diagrams, exploded views, step-by-step instructions, troubleshooting guide, manufacturer specifications.
Visuals:
Numerous pictures, diagrams, and illustrations to aid in understanding repair procedures.
Primary Coverage:
Comprehensive service and repair for Allis-Chalmers AC 616, 620, and 720 tractors.
Estimated Page Count:
Varies by specific manual, but typically between 200-600 pages for comprehensive workshop manuals covering multiple models.
Type:
Workshop Service Repair Manual
Powertrain:
Engine, Transmission, Clutch, Drive Shaft, Rear PTO, Final Drive, Hydrostatic Unit
Chassis And Controls:
Brakes, Steering, Front Axle Assemblies, Power Lift System, Wheels & Drop Housings
Electrical:
Charging Circuit, Ignition Circuit, Starting Circuit, Lights & Hourmeter Circuit, Pressure & Temperature Sending Unit Circuit, PTO Circuit, Removal & Installation Of Electrical Components
Fuel System:
Fuel system maintenance, filter replacement, and potential troubleshooting.
Cooling System:
Although not explicitly listed, engine maintenance typically includes cooling system checks (radiator, hoses, thermostat) which would be covered.
Power Lift System:
Hydraulic pump, control valve, cylinder, and linkage for the power lift system.
Maintenance:
Routine maintenance, tune-ups, fluid changes (transmission, hydraulic), filter replacement, brake adjustment, clutch adjustment.
Repair And Rebuild:
Engine overhaul, transmission repair, brake system overhaul, steering system repair, hydraulic system repair, electrical system diagnostics and repair, PTO overhaul, final drive rebuild.
Troubleshooting:
Detailed troubleshooting guide for common issues across all covered systems.
Component Removal Installation:
Detailed procedures for removing and installing major components like the engine, transmission, axles, and hydraulic lift system.
Wheel Alignment:
Procedures for checking and adjusting front wheel alignment and toe-in for proper steering and tire wear.
Depth:
Comprehensive, covering everything from basic adjustments to complete component rebuilds. Includes detailed diagrams and specifications.
Torque Specifications:
Crucial torque values for critical fasteners and engine components would be included.
Schematics:
Detailed electrical schematics and hydraulic system diagrams.
Engine Type:
Likely diesel engines, common for tractors of this era. Specific engine models would vary by tractor variant (e.g., 616, 620, 720).
Typical Horsepower Range:
Likely in the 20-40 horsepower range, depending on the specific model (616, 620, 720).
Torque Figures:
Specific torque output figures for engine variants would be detailed in the manual.
Components:
Fuel pump, injectors, filters, glow plugs (for cold starting).
Engine Identification:
The manual would likely detail specific engine model numbers and configurations used in each tractor variant.
Transmission Type:
Likely a manual transmission with multiple forward and reverse gears, possibly with a high/low range selector.
Hydrostatic Drive:
The manual mentions an 'In-Line Hydrostatic Unit', suggesting hydrostatic transmission was an available option or standard on certain models.
Clutch Type:
Likely a dry-type, single-plate or dual-plate clutch, with manual pedal adjustment for free travel.
Gear Ratios:
Specific gear ratios for each forward and reverse gear would be included for diagnostics and repair.
Pto Speeds:
Information on Rear PTO engagement, operation, and potentially standard PTO speeds (e.g., 540 RPM).
Wheelbase:
Variable by model; specific dimensions not provided in product info but detailed in the manual.
Tire Sizes:
Standard and optional tire sizes for front and rear axles would be detailed.
Wheelbase Range:
Approximate wheelbase for compact utility tractors is typically in the 60-75 inch range, but specific data would be in the manual.
Operating Weight:
Variable by model; detailed specifications would be within the manual.
Safety Features:
While specific crash ratings are not applicable to tractors in the same way as passenger cars, the manual would cover safety aspects related to operation, braking systems, PTO guards, and operator presence controls.
Operational Safety:
Brake adjustments, clutch pedal free travel, PTO engagement procedures, and hydraulic system safety.
Features:
Tractors of this era typically feature basic instrumentation (hourmeter, oil pressure, temperature gauges) rather than infotainment systems.
Features:
No advanced driver-assistance systems. Focus is on mechanical and basic electrical systems.
Features:
No digital connectivity features. The manual covers the tractor's electrical system for functional components like lights and engine starting.
Fluid Changes:
Detailed intervals for engine oil, transmission fluid, and hydraulic fluid changes, along with filter replacement, would be provided in the manual. Typically 250-500 operating hours for engine oil, and potentially longer for transmission/hydraulic fluid depending on usage.
Greasing Schedule:
Recommended greasing intervals for various pivot points, universal joints, and bearings.
Engine Oil:
Specific SAE viscosity grade (e.g., 10W-30, 15W-40) and API service classification would be detailed in the manual.
Transmission Hydraulic Fluid:
Likely a tractor hydraulic fluid (THF) or a specified multi-purpose tractor oil (MTO). Specific API/OEM specifications to be found in the manual.
Gear Oil:
Specifications for any separate gear oil used in final drives or axle housings.
Grease Types:
Recommended grease types and lubrication points for chassis components, bearings, and linkages.
Common Wear Points:
Potential wear areas include clutch components, PTO engagement mechanisms, steering linkages, and hydraulic pumps/cylinders. The manual would guide on inspection and repair of these.
Common Repairs:
The manual would guide on common repairs such as hydraulic cylinder seals, steering box adjustments, and PTO shaft maintenance.
Electrical Problems:
Common electrical issues like faulty starter solenoids, generator/alternator issues, and wiring harness degradation.
Engine Oil Filter:
Part numbers for engine oil filters, fuel filters, and hydraulic filters would be provided.
Manufacturer:
Allis-Chalmers, a historic American manufacturer of agricultural and construction machinery.
Series:
The AC 616, 620, and 720 likely represent a compact to utility tractor series from Allis-Chalmers, designed for a range of agricultural and property maintenance tasks.
