Market Position:
Essential diagnostic and repair resource for owners and mechanics of International Harvester 986 and 1086 tractors, catering to both DIY enthusiasts and professional technicians.
Target Audience:
Farmers, agricultural mechanics, tractor restoration enthusiasts, and service technicians working with International Harvester 986 and 1086 tractors.
Competitive Analysis:
Offers comprehensive, actionable information in a readily accessible PDF format, distinct from limited or outdated physical manuals. Focuses on practical repair guidance with clear illustrations and detailed specifications.
Key Features:
Instant PDF download, printable pages, detailed procedures, clear illustrations, troubleshooting guidance, service data, and torque specifications.
Value Proposition:
Provides essential technical data, enabling users to perform accurate repairs, reduce downtime, and maintain optimal performance of their International Harvester tractors.
Systems Covered:
Engine, transmission, drivetrain, hydraulics, electrical system, brakes, steering, chassis, operator station, implements control.
Engine Systems:
Engine overhaul, cylinder head, piston and rod assembly, crankshaft and bearings, camshaft, timing gears, lubrication system, cooling system, fuel system (injection pump, injectors).
Transmission Drivetrain:
Power shift transmission components, clutch operation, differential, final drives, PTO engagement and operation.
Hydraulics Systems:
Hydraulic pump, control valves, lift arms, remote cylinders, hydraulic fluid reservoir, troubleshooting hydraulic pressure issues.
Electrical Systems:
Starter, alternator, battery, ignition system (if applicable for older models or specific configurations), lighting, dashboard indicators, wiring diagrams.
Chassis Steering Brakes:
Front axle, rear axle, steering system (hydrostatic power steering), brake system (wet disc brakes), wheel bearings.
Operator Station:
Seat assembly, controls (throttle, clutch, gear shift), dashboard, cab components (if equipped).
Procedures Included:
Removal, installation, disassembly, assembly, adjustment, troubleshooting, diagnostics, maintenance, repair.
Maintenance Procedures:
Routine checks, lubrication schedules, filter replacement intervals, fluid level checks and top-offs.
Repair Procedures:
Detailed disassembly and reassembly of major components, component replacement, and adjustment procedures.
Troubleshooting Diagnosis:
Systematic diagnostic flowcharts and procedures for identifying and resolving common operational problems.
Special Tool Usage:
References to specific International Harvester service tools required for certain operations, with accompanying illustrations.
Adjustment Procedures:
Includes adjustments for clutch engagement, brake sensitivity, hydraulic control valves, and engine timing.
Technical Depth:
Detailed step-by-step procedures, explanations, pictorial diagrams, exploded diagrams, and photos. Includes service tool references, wear limits, tightening torques, and factory specifications.
Repair Methodology:
Emphasizes a systematic approach to repair, including preliminary checks, fault diagnosis, component removal, repair procedures, assembly, and final adjustments with performance verification.
Diagrams Illustrations:
Richly illustrated with exploded views, line drawings, and photographs to clarify complex procedures and component identification.
Engine Type:
International Harvester DT-402, DT-436, DT-466 (Diesel - specific engine may vary by tractor configuration, manual covers applicable engines).
Engine Displacement:
Approx. 402, 436, or 466 cubic inches (depending on specific model variant).
Horsepower Range:
Generally in the 70-100 PTO horsepower range, depending on engine and configuration.
Torque Specifications:
Manual provides detailed torque specifications for all engine components.
Fuel System Components:
Injection pump, injectors, fuel filters, fuel lines, fuel tank.
Injection Pump Service:
Details service procedures for diesel injection pumps, including timing and calibration.
Transmission Type:
Power Shift (e.g., 3-speed or 4-speed ranges) or Manual Gearbox (e.g., synchronized constant mesh) depending on specific model configuration.
Transmission Gear Options:
Typically offered with a 16-speed or 18-speed transmission (e.g., 8 forward/4 reverse or similar configurations) with a synchronized shuttle.
Optional Features:
Variations in power take-off (PTO) options and possibly creeper gears.
Transmission Features:
Detailed procedures for clutch operation, gear shifting mechanisms, and power take-off engagement.
Power Take Off Service:
Covers service and repair of the rear PTO, including clutch packs and engagement mechanisms.
Service Intervals:
Manual provides detailed periodic maintenance charts for engine oil changes, filter replacements, fluid checks, lubrication points, and hydraulic system servicing.
Lubrication Points:
Comprehensive lubrication schedule identifying all grease points, oil change intervals for transmission, hydraulics, and engine.
Engine Oil Type:
API CD or equivalent (e.g., SAE 30 or 15W-40 diesel engine oil as specified in manual).
Hydraulic Fluid Type:
IH Hy-Tran fluid or equivalent Type 'C' tractor hydraulic fluid.
Transmission Fluid Type:
Specific IH transmission fluid or approved equivalent as detailed in the manual.
Coolant Type:
Ethylene glycol based antifreeze mixed with distilled water, according to manual specifications.
Common Issues:
Manual addresses potential issues such as hydraulic pump performance, PTO clutch wear, engine starting problems, and electrical system faults common to tractors of this era.
Common Repair Areas:
Focus on reconditioning PTO clutches, overhauling hydraulic systems, engine tune-ups, and addressing wear in the transmission or drivetrain.
Brand Heritage:
International Harvester (IH) was a major American manufacturer of agricultural machinery, construction equipment, and vehicles, known for its robust and reliable equipment.
Model Evolution:
The 986 and 1086 represent models from the late 1970s and early 1980s, part of IH's established tractor lines, succeeding earlier models and paving the way for future designs.
Model Designation:
Part of the International Harvester '86 series' tractors, known for their cab comfort and advanced features for their time.
Production Years:
Approximately 1976-1981 (exact range may vary slightly by specific tractor series).
