Target Audience:
Owners, operators, mechanics, and service technicians of the Allis-Chalmers Model 7080 Tractor.
Manual Value:
Provides the essential technical knowledge for maintaining, repairing, and troubleshooting the Model 7080, significantly reducing reliance on external service providers and saving costs.
Information Layout:
Organized with a table of contents for easy navigation and quick access to specific repair or maintenance procedures.
Primary Coverage:
Service, Repair, Maintenance, Troubleshooting, Diagnostics, Overhaul, Wiring Diagrams
Estimated Page Count:
Varies (typical factory service manuals for this era are extensive, often 500+ pages)
Type:
Factory Service Repair Manual / Workshop Manual
Engine:
Complete engine overhaul, diagnostics, fuel system, cooling system, lubrication system, ignition system (if applicable, depending on engine variant), starting system, charging system.
Transmission:
Manual and Power Shift transmissions (if equipped), clutch, drive shafts, differentials, final drives, PTO (Power Take-Off).
Hydraulics:
Hydraulic pump, control valves, cylinders, hoses, filters, three-point hitch, implement control, power steering.
Electrical:
Wiring diagrams, starter, alternator, battery, lighting, instrumentation, starter solenoids, switches, sensors.
Chassis And Body:
Frame, front axle, steering system, brake system (hydraulic, parking), operator station, fenders, drawbar.
Maintenance:
Regular service intervals, fluid changes, filter replacement, lubrication points, pre-operation checks, seasonal storage.
Troubleshooting:
Step-by-step diagnostic procedures for common and uncommon problems across all major systems.
Repair And Overhaul:
Detailed disassembly, inspection, repair, and reassembly instructions for all major components and sub-systems.
Calibration And Adjustment:
Procedures for adjusting engine, transmission, hydraulics, and braking systems to factory specifications.
Depth:
Comprehensive, covering from routine maintenance to full engine and transmission rebuilds, including detailed diagnostic flowcharts and specifications.
Readability:
Searchable text within PDF, allowing for quick information retrieval.
Compatibility:
Compatible with all versions of Windows and Mac operating systems. Requires Adobe PDF Reader and WinZip for extraction/viewing.
Printability:
Printable pages for in-shop use, ensuring legibility of diagrams and text.
Digital Format Advantage:
Digital format offers instant access and portability on various devices.
Make Model:
Allis-Chalmers 3500 Mark II (or similar OHV diesel)
Displacement:
6.3 Liters (384 cu. in.)
Rated Horsepower:
Approximately 155 Engine HP / 130 PTO HP
Peak Torque:
Refer to specific manual sections for exact torque figures, typically around 400-450 lb-ft.
Injection Type:
Direct Injection, likely with Bosch or Roosa-Master rotary injection pump.
Type:
Water-cooled, typically with a belt-driven fan and high-capacity radiator.
Oil Capacity:
Refer to manual for specific capacity, usually around 12-15 quarts (11.4-14.2 liters).
Recommended Oil:
API CD or CE rated heavy-duty diesel engine oil, SAE 15W-40 or 10W-30 depending on ambient temperature. Consult manual for exact specifications.
Type:
Full PowerShift (Powershift) transmission, offering multiple gears without clutching.
Options:
Some models may have had a partial powershift or a constant mesh transmission option depending on regional specifications and build dates.
Gears:
Typically 20 forward and 20 reverse speeds for full powershift variants.
Transmission Fluid:
Refer to manual for specific JD J20C or equivalent; often a Universal Tractor Transmission Oil (UTTO) or Caterpillar TO-4 fluid is recommended.
Wheelbase:
Approximately 106 inches (2692 mm)
Operating Weight:
Approximately 16,000 - 18,000 lbs (7257 - 8165 kg) depending on configuration.
Drawbar Pull:
High, designed for heavy draft work.
Operator Station Rollover:
Often equipped with a Roll-Over Protective Structure (ROPS), a critical safety feature for tractor operations.
Braking System:
Hydraulically actuated wet disc brakes, providing robust stopping power and durability. Parking brake system included.
Operator Comfort:
Enclosed or semi-enclosed cab options with climate control available on some models, enhancing operator safety and comfort.
Operator Interface:
Basic mechanical controls and gauges. Focus on functionality and durability rather than advanced electronic interfaces.
Pto Control:
Mechanical or electro-hydraulic PTO engagement controls, allowing for controlled implement power delivery.
Three Point Hitch Control:
Advanced hydraulic draft and position control systems for precise implement operation.
Remote Hydraulics:
Multiple hydraulic remote valve outlets for operating auxiliary hydraulic equipment.
Engine Oil Filter:
Typically every 250-500 operating hours, or annually. Consult manual for exact interval.
Fuel Filter:
Replace as needed, often recommended at 500-1000 operating hours or if fuel system issues arise.
Transmission Hydraulic Filter:
Typically every 1000-1500 operating hours or when performing major hydraulic service.
Hydraulic Fluid Capacity:
Refer to manual for specific capacity, often around 20-25 gallons (75-95 liters) for the combined hydraulic and transmission sump.
Coolant Type:
Ethylene Glycol based antifreeze. 50/50 mix with distilled water recommended. Consult manual for specific freeze protection.
Common Wear Items:
Wear on powershift clutches, hydraulic pump and valve seals, front axle pivot pins and bushings, PTO clutch plates.
Electrical System:
Older wiring harnesses can degrade, leading to intermittent electrical faults. Proper diagnostic techniques are crucial.
Manufacturer:
Allis-Chalmers Manufacturing Company, a major American manufacturer of agricultural and industrial machinery.
Series Position:
Part of the '80 Series' generation of articulated and two-wheel drive tractors, known for their robustness and power.
Production Years:
Mid to late 1970s through the early 1980s (approx. 1977-1982).
