Target User:
Owners, operators, mechanics, and technicians working on International Harvester 786, 886, 986, and 1086 tractors.
Benefit Statement:
Enables users to perform their own repairs, saving significant costs and downtime.
Content Highlight:
Features step-by-step instructions, detailed illustrations, and wiring diagrams for all repair areas.
Convenience:
Printable pages allow for easy use in workshop environments without risking damage to the original document.
Market Segment:
Medium-horsepower farm tractors, competing with models from John Deere, Case IH, Ford, and others of the era.
Engine Service:
Complete engine overhaul, diagnostics, repair, and adjustment procedures for all engine variants.
Transmission Service:
Service and repair for hydrostatic transmission, power shift, and gear drive systems, including clutch and PTO operations.
Hydraulic System Service:
Repair and maintenance of the tractor's hydraulic system, including pump, valves, cylinders, and auxiliary equipment.
Electrical System Service:
Detailed wiring diagrams, troubleshooting guides, and repair procedures for all electrical components, starting, charging, and lighting systems.
Chassis And Drive Train:
Service for front axle, rear axle, brakes, steering, and drivetrain components.
Cooling System Service:
Maintenance and repair of the radiator, thermostat, fan, and coolant passages.
Fuel System Service:
Diagnosis and repair of fuel injection systems, fuel pumps, filters, and lines.
Operator Station Service:
Repair of cabin, controls, seating, and HVAC systems (if applicable).
Front Axle Steering:
Service and repair of steering mechanisms, front axle components, and wheel alignment.
Brake System Service:
Maintenance and repair of hydraulic and mechanical brake systems.
Routine Maintenance:
Detailed procedures for all routine checks, lubrication, fluid changes, and filter replacements.
Troubleshooting Guides:
Comprehensive diagnostic trees and fault finding procedures for common and complex issues.
Disassembly And Reassembly:
Step-by-step instructions with detailed illustrations for component removal, overhaul, and installation.
Adjustment And Calibration:
Procedures for adjusting engine timing, clutch engagement, hydraulic pressures, and other critical parameters.
Part Replacement:
Guidance on replacing individual components and sub-assemblies.
Diagnostics:
In-depth diagnostic procedures for identifying and resolving mechanical and electrical faults.
Depth Of Coverage:
Comprehensive, covering all aspects from basic maintenance to complete overhaul and advanced diagnostics.
Manual Scope:
Full Workshop Service Manual (WSM) / Repair Manual.
Diagnostic Tools:
Covers procedures requiring common mechanic's tools as well as specialized diagnostic equipment and torque specifications.
Engine Families:
DT-360, DT-466 (Diesel)
Engine Displacement 786 886:
360 cubic inches (approx. 5.9 Liters)
Engine Displacement 986 1086:
466 cubic inches (approx. 7.6 Liters)
Fuel System Type:
Direct Injection Diesel with Bosch or CAV/Lucas fuel injection pumps.
Horsepower Range:
Varied by model, generally from ~75 HP (786) to ~125 HP (1086).
Torque Characteristics:
Designed for robust low-end torque delivery essential for agricultural applications.
Maintenance Considerations
Valve Lash Adjustment:
Critical maintenance procedure detailed in the manual.
Transmission Type 786 886:
Dyna-Life (16-speed partially synchronized transmission) or optional Hi-Lo transmission.
Transmission Type 986 1086:
Power-Shift (14-speed or 16-speed) transmission.
Optional Transmission Types:
Certain models may have had other factory or dealer-installed options, including hydrostatic.
Power Takeoff Pto:
Standard 540/1000 RPM PTO, with service and maintenance procedures covered.
Transmission Fluid Type:
Specific IH specification fluids (e.g., Hy-Trans) or equivalent, details provided in manual.
Transmission Fluid Capacity:
Capacity varies by transmission type; specific capacities listed in manual.
Wheelbase:
Varies by model, typically around 90-96 inches.
Operating Weight:
Approximately 8,000 - 11,000 lbs, depending on configuration.
Drawbar Horsepower Rating:
Designed to deliver substantial pulling power for agricultural implements.
Engine Oil Change:
Typically every 100-250 operating hours, depending on operating conditions. Manual specifies precise intervals.
Air Filter Service:
Frequent checks, especially in dusty conditions. Replacement intervals vary. Manual provides guidance.
Fuel Filter Replacement:
Recommended at regular intervals or when experiencing fuel system issues. Manual specifies.
Engine Oil Type:
API CD or CE rated diesel engine oil (e.g., SAE 15W-40). Specific IH specifications detailed.
Coolant Type:
Ethylene glycol-based antifreeze (e.g., 50/50 mix with water). Specific IH coolant recommendations in manual.
Common Wear Items:
Potential for wear on clutch components, hydraulic pump seals, and PTO clutch packs due to high usage.
Electrical System Considerations:
Older wiring harnesses can degrade, requiring inspection and potential replacement/repair of connections and grounds.
Engine Performance Issues:
Loss of power or rough running can be attributed to fuel system maintenance, injector issues, or turbocharger problems (if equipped).
Manufacturer Legacy:
International Harvester (IH) was a prominent American manufacturer of agricultural and construction equipment, known for its durable and reliable machinery.
Series Development:
These tractors represent a significant line of medium-horsepower farm tractors for IH, evolving from earlier designs to incorporate more advanced features for their time.
Production Period:
Primarily produced in the late 1970s and early 1980s.
Manufacturing Plant:
Likely manufactured at IH's major tractor assembly plants, such as Louisville, Kentucky.
