Tractor Class:
Heavy-duty agricultural tractors, known for power and versatility in their era.
Competitors:
Competed with other major tractor manufacturers like John Deere, Case IH (pre-merger), and Ford in the large horsepower segment.
Engine Power:
Offered significant horsepower for demanding farm tasks. Key models featured robust IH DT-series diesel engines.
Transmission Options:
Featured advanced (for the time) powershift transmissions, enhancing operational efficiency and driver comfort.
Hydraulic System:
Equipped with a capable hydraulic system supporting various implements and advanced hitch controls.
Operator Comfort:
Offered optional air-conditioned cabs, contributing to operator comfort during long working hours.
Value:
Provides essential, manufacturer-sourced information for maintaining and repairing these powerful and durable tractors, crucial for owners seeking to maximize longevity and performance.
Engine:
Detailed troubleshooting, overhaul, and component testing for D-series diesel engines (e.g., D358, D414, D436, D466)
Transmission:
Repair and adjustment of the full powershift transmission, clutch, and PTO systems
Hydraulics:
Service and troubleshooting of the hydraulic system, including pumps, valves, cylinders, and the 3-point hitch
Electrical:
Wiring diagrams, component testing, starter, alternator, lighting systems, and dashboard instrumentation
Chassis And Steering:
Front axle, steering system (hydrostatic power steering), rear axle, and braking systems
Fuel System:
Service and calibration of fuel injection pumps and injectors
Cooling System:
Radiator, fan, water pump, and thermostat service
Air Conditioning:
Service and repair of the factory-installed A/C system (if equipped)
Frame And Axles:
Front and rear axle assemblies, differential, final drives, and frame integrity checks.
Operator Station:
Cab removal/installation (if equipped), controls, seat, and platform service.
Brake System:
Service and adjustment of the mechanical disc brakes.
Maintenance:
Routine maintenance, lubrication schedules, filter changes, and fluid checks
Troubleshooting:
Diagnostic procedures for common operational issues across all systems
Repair:
Step-by-step repair instructions for all major components and sub-assemblies
Overhaul:
Complete engine and transmission overhaul procedures with specifications
Disassembly And Assembly:
Detailed instructions for component removal, disassembly, inspection, and reassembly
Alignment And Adjustment:
Procedures for setting critical clearances, adjustments, and alignments
Diagnostics:
Systematic diagnostic charts and flowcharts for engine, transmission, and hydraulic problems.
Component Rebuilds:
Detailed guides for rebuilding components like the hydraulic pump, power steering cylinder, starter, and alternator.
Depth:
Comprehensive: Covers basic maintenance to full engine and transmission rebuilds, including detailed specifications and diagnostic charts.
Specifications:
Includes critical torque values, clearances, pressure specifications, and dimensional data for all serviced components.
PDF Quality:
High-resolution, optimized for readability and searchability; includes bookmarks for easy navigation.
Searchable Text:
Yes, the PDF is designed with searchable text for quick information retrieval.
Bookmarks:
Yes, includes bookmarks for efficient navigation through sections.
Printable:
Printable PDF pages allowing users to create a physical copy.
Binding:
N/A (Digital PDF download)
Paper Type:
N/A (Digital PDF download)
Engine Type:
Direct injection, turbocharged, naturally aspirated diesel engines (IH DT-series)
Displacement 1466:
466 cubic inches (7.6 Liters) - Typically IH DT466
Displacement 1468:
414 cubic inches (6.8 Liters) - Typically IH D414 or DT414
Displacement 1486:
466 cubic inches (7.6 Liters) - Typically IH DT466
Horsepower 1466:
Approx. 145 PTO horsepower (varies by specific configuration)
Horsepower 1468:
Approx. 125 PTO horsepower (varies by specific configuration)
Horsepower 1486:
Approx. 145 PTO horsepower (varies by specific configuration)
Torque:
Specifications for engine torque output are available within the manual for each engine variant.
Injection System:
Roosa Master or Bosch inline fuel injection pumps
Fuel Type:
Diesel Fuel #2
Coolant Capacity:
Approximately 25-30 quarts (varies slightly)
Transmission Type:
IH 2-Speed Power Shift (also known as TA - Torque Amplifier, and Full Powershift)
Number Of Gears:
16 Forward Speeds / 6 Reverse Speeds (with Power Shift engaged)
Optional Transmission:
Standard 8-speed transmission (less common on these models, but possible on earlier iterations or specific configurations).
Pto Options:
540/1000 RPM PTO (standard), 1000 RPM PTO (optional)
Transmission Fluid:
IH Hy-Trans (or equivalent UTF - Universal Tractor Fluid)
Transmission Oil Capacity:
Approximately 20-25 quarts
Engine Oil Change:
Every 250 hours or annually. (Refer to manual for specific engine type).
Fuel Filter Replacement:
Every 500 hours or as needed based on fuel quality. (Refer to manual for specific filter part numbers).
Hydraulic Fluid Change:
Every 1000 hours or annually. (Refer to manual for filter replacement).
Engine Oil Spec:
API CD or CE rated Diesel Engine Oil, SAE 15W-40 (or SAE 30 for warmer climates). (Confirm with specific engine manual section).
Transmission Fluid Spec:
IH Hy-Trans or equivalent UTF (Universal Tractor Fluid) meeting IH specification B6 or B4.
Hydraulic Fluid Spec:
IH Hy-Trans or equivalent UTF meeting IH specification B6 or B4.
Common Wear Points:
Wear in powershift transmission clutch packs, hydraulic pump wear, front axle kingpins and bushings, and electrical connection corrosion are common.
Engine Overheating:
Can be caused by radiator blockage, faulty thermostat, or worn water pump. The manual provides diagnostic steps.
Powershift Slippage:
Often indicates low hydraulic pressure, worn clutch packs, or faulty control valve. Requires detailed diagnostic procedures from the manual.
Brand Legacy:
International Harvester has a long and storied history in agricultural machinery, known for robust and powerful equipment.
Series Introduction:
The 1466, 1468, and 1486 were part of IH's '96' and '86' series, representing a significant evolution in tractor design, comfort, and power in the 1970s and early 1980s.
Design Philosophy:
The '86 series represented a move towards more integrated and user-friendly tractor designs for IH.
Production Years:
1466: ~1971-1973; 1468: ~1974-1975; 1486: ~1976-1981.
