The International Harvester 986 and 1086 tractors, produced from approximately 1976 to 1981, represent a significant advancement in agricultural machinery. As part of IH's renowned '86 series, these diesel-powered tractors are known for their robust engineering and reliability, designed to meet the demanding needs of farm operations. They feature powerful engines, typically in the 100-140 horsepower range, and come equipped with various transmission options, including manual and power shift configurations. The legacy of International Harvester is built on providing durable and dependable equipment, and the 986 and 1086 models exemplify this commitment to quality and performance.
This comprehensive workshop repair service manual provides in-depth technical information for the International Harvester 986 and 1086 tractors. It covers all models, engines, trims, and transmissions, offering professional-grade diagnostic, repair, and maintenance guidance. Within its hundreds of pages, you will find detailed procedures for engine service, lubrication, cooling, fuel, clutch, transmission, drive chain, axles, brakes, steering, suspension, body work, intake/exhaust, and hydraulic systems. The manual also includes extensive troubleshooting sections, routine maintenance instructions, and original wiring diagrams, making it an essential resource for owners, operators, and mechanics seeking to maintain and repair these tractors efficiently.
Make:
International Harvester
Target Audience:
Owners, operators, and mechanics of IH International Harvester 986 and 1086 tractors.
Comprehensiveness:
Complete and intact, covering all models, engines, trim, and transmission types without missing or corrupt parts.
Professional Quality:
Same quality manual used in local service/repair shops, written by manufacturers.
Cost Savings:
Enables users to perform repairs and maintenance themselves, saving significant costs.
Accessibility:
Instant download provides immediate access to crucial repair information.
Usability:
Features step-by-step instructions, diagrams, pictures, and detailed explanations for ease of use.
Primary Models Covered:
IH International Harvester 986, IH International Harvester 1086
All Models Trims Transmissions Engines:
True
Estimated Page Count:
Hundreds of pages
Type:
Workshop Repair Service Manual
Engine Service:
Detailed service, maintenance, and troubleshooting for all engine types.
Lubrication System:
Comprehensive coverage of the lubrication system.
Cooling System:
Detailed information on the cooling system.
Fuel System:
Service and maintenance for the fuel system.
Clutch Service:
Complete procedures for clutch disassembly and service.
Transmission Service:
In-depth repair and maintenance for the transmission.
Drive Chain Sprockets:
Service and maintenance for drive chains and sprockets.
Rear Axle Service:
Detailed axle repair and maintenance.
Brake System:
Complete brake service and repair procedures.
Front Axle Service:
Front axle service and repair information.
Steering System:
Service and troubleshooting for the steering system.
Shocks Suspension:
Information related to shock absorbers and suspension.
Body Work:
Procedures for body work and related components.
Intake Exhaust Systems:
Maintenance and repair for intake and exhaust systems.
Hydraulic System:
Comprehensive coverage of the hydraulic system.
Electrical System:
Service and troubleshooting for the electrical system, including wiring diagrams.
Routine Maintenance:
Detailed instructions for routine maintenance tasks.
Troubleshooting:
Advanced troubleshooting guides for common and complex issues.
Wiring Diagrams:
Includes original wiring diagrams.
Disassembly Servicing:
Step-by-step procedures for disassembly and servicing of major components.
General Repair:
General repair procedures applicable to the tractors.
Separation Procedures:
Detailed instructions for separating major tractor assemblies.
Component Rebuild:
Instructions for rebuilding key components.
Depth:
Professional-grade, comprehensive diagnostic, repair, and maintenance information.
User Level:
Suitable for professional technicians and experienced DIY users.
Download Type:
Instant Download
Printability:
Full Printable
Zoom Functionality:
Zoom IN/OUT enabled
Binding Type:
Digital (PDF)
Paper Type:
Not Applicable (Digital)
Software Requirements:
Adobe PDF Reader, WinZip
Operating System Compatibility:
All Versions of Windows & Mac
Engine Type:
Diesel (specifics depend on model/configuration, typically DT-466 or similar IH diesel engines)
Horsepower Range:
Refer to specific model variants within the manual (e.g., 986 typically in the 100-120 HP range, 1086 in the 120-140 HP range)
Torque Specifications:
Detailed torque specifications for engine components found within the manual.
Injection System:
Information on diesel injection pump and injector service covered.
Transmission Type:
Manual, synchronized transmission (e.g., IH 16-speed power shift or 10-speed constant mesh)
Optional Transmission:
Power Shift options available on some configurations (covered in manual).
Gear Ratios:
Detailed gear ratios and transmission assembly information are included.
Transmission Fluid Specifications:
Recommended transmission fluid types and capacities detailed.
Operating Weight:
Refer to manual for specific model weights (typically 9,000-12,000 lbs or more depending on configuration).
Drawbar Horsepower:
Technical specifications for drawbar horsepower are usually included in tractor manuals.
Infotainment Features:
Tractors of this era typically have basic radio options; the manual covers the electrical systems relevant to these.
Driver Assistance Features:
Focus is on mechanical and electrical systems, not modern driver assistance features.
Connectivity Options:
No electronic connectivity features typically found on these models.
Engine Oil Change:
Specific intervals (e.g., every 100-250 hours) for engine oil and filter changes are detailed in the manual.
Hydraulic Fluid Change:
Recommended intervals for hydraulic fluid and filter replacement provided.
Engine Oil Type:
Manual specifies recommended diesel engine oil viscosity grades (e.g., SAE 15W-40) and API service classifications.
Hydraulic Fluid Type:
Specifications for hydraulic/transmission fluid (e.g., IH Hy-Trans or equivalent) will be listed.
Coolant Specifications:
Recommended coolant type and mixture ratios for the cooling system are included.
Common Wear Points:
The manual would detail common wear points and their troubleshooting, such as clutch wear, hydraulic pump issues, and transmission synchro wear.
Electrical Gremlins:
Troubleshooting common electrical issues like starter solenoid problems, lighting circuit faults, and gauge failures is covered.
Hydraulic System Performance:
Common hydraulic performance issues, such as slow or erratic lift, are addressed with diagnostic steps.
Brand History:
International Harvester (IH) was a major American manufacturer of agricultural and construction machinery, known for its robust and reliable equipment.
Model Series:
The 986 and 1086 were part of IH's highly successful '86 series tractors, introduced in the mid-1970s, representing advancements in comfort and performance.
Production Years:
The 86 series, including the 986 and 1086, were primarily produced from approximately 1976 to 1981.
