Target Audience:
Owners of IH 986 and 1086 tractors, farm mechanics, agricultural repair shops, and collectors seeking to maintain or restore these machines.
Value Proposition:
Provides authoritative, factory-sourced repair information, enabling cost savings on repairs and empowering users with in-depth knowledge of their tractor's systems. Offers a crucial resource for preserving the longevity and functionality of these agricultural workhorses.
Manual Features:
Hundreds of pages, detailed substeps, notes/cautions/warnings, numbered instructions, bold figure numbers, detailed illustrations/drawings/photos, enlarged inset views, numbered table of contents, troubleshooting guides, wiring diagrams.
Illustrative Content:
Content rich with photos, drawings, and illustrations to clarify complex procedures and component identification.
Topics Covered:
General information, specifications, engine, cooling system, fuel system, power train, front axle, clutch, differential lock, electrical system, brakes, fenders, fuel tank & platform, final drive, front system, front-wheel drive, hydraulic system, main drive bevel gears and differential, park brake, power steering system, power take-off, rear axle, steering gear, transmission, and more.
Estimated Pages:
Hundreds (specific count not provided, but described as comprehensive)
Type:
Workshop Service Repair Manual
Accuracy Source:
Official full factory service repair manual.
Delivery Method:
Instant download after purchase.
Engine Systems:
Engine overhaul, diagnostics, repair, specifications, cooling system, fuel system (injection and carburetion if applicable), lubrication.
Drivetrain Systems:
Clutch (single/dual plate, PTO clutch), transmission (gearbox, shifting mechanisms, ratios), power take-off (PTO) operation and repair, final drive, differential lock, front axle (steering linkage, hubs), rear axle, main drive bevel gears, front-wheel drive (if applicable).
Hydraulic And Steering Systems:
Hydraulic system (pumps, valves, cylinders, remote hydraulics, hitch control), power steering system (components, operation, troubleshooting).
Electrical And Braking Systems:
Electrical system (wiring diagrams, starter, alternator, battery, lighting, gauges, troubleshooting), braking system (service brakes, park brake).
Body And Chassis:
Fenders, fuel tank, operator platform, hitch components, drawbar.
Specialized Systems:
Covers specialized agricultural systems such as the three-point hitch, draft control, and auxiliary hydraulic outlets.
Repair Procedures:
Complete disassembly and reassembly of major components, engine rebuilds, transmission overhauls, hydraulic system repair, electrical troubleshooting, brake system servicing, front and rear axle maintenance.
Maintenance Tasks:
Routine maintenance, fluid changes, lubrication, filter replacement, adjustments, preventative maintenance.
Troubleshooting Guides:
Integrated troubleshooting sections for common issues across various systems, aiding in rapid diagnosis.
Depth:
Comprehensive factory-level service and repair information suitable for both experienced mechanics and do-it-yourself users. Includes detailed step-by-step instructions, troubleshooting guides, and diagnostic procedures.
Diagnostic Capabilities:
Detailed diagnostic procedures for identifying the root cause of mechanical and electrical faults, including schematics and component testing methods.
Rebuild Procedures:
Provides complete instructions for complete engine, transmission, and hydraulic component rebuilds, including torque specifications and clearances.
Engine Family:
International Harvester DT-436 (for 1086) and DT-414 (for 986)
Engine Displacement 986:
414 cubic inches (approx. 6.8 Liters)
Engine Displacement 1086:
436 cubic inches (approx. 7.1 Liters)
Engine Type:
Direct Injection, Turbocharged Diesel
Bore Stroke 986:
Refer to manual for specific bore and stroke dimensions of the DT-414.
Bore Stroke 1086:
Refer to manual for specific bore and stroke dimensions of the DT-436.
Horsepower 986 Est:
Approx. 95-105 PTO HP (varies by specific configuration)
Horsepower 1086 Est:
Approx. 115-125 PTO HP (varies by specific configuration)
Fuel Injection System:
Bosch inline injection pump
Fuel Pump Type:
Rotary or Inline type, depending on specific engine variant and production date.
Transmission Type:
T-144 (16-speed Power Shift Transmission - PST) or T-154 (16-speed synchromesh)
Transmission Options:
Typically featured a manual transmission with a creeper gear or a Power Shift (PST) option for on-the-go shifting.
Gear Selection Method:
Manual lever operation with synchronization for smooth shifting, or hydraulic engagement for Power Shift models.
Power Shift Operation:
If equipped with PST, details on clutch pack operation, hydraulic control, and power distribution between gear sets.
Operating Weight Approx 986:
Approx. 8,500 - 9,500 lbs (depending on configuration)
Operating Weight Approx 1086:
Approx. 9,000 - 10,000 lbs (depending on configuration)
Wheelbase:
Refer to specific model charts within the manual for exact dimensions.
Rear Axle Capacity:
Refer to manual for specific weight ratings of the rear axle and hitch.
Instrumentation:
Includes dashboard gauges for engine RPM, oil pressure, coolant temperature, fuel level, and often warning lights for charging and hydraulic pressure. May include hour meter.
Operator Comfort Features:
Cab options often included air conditioning, heating, and sound insulation for improved operator comfort during long workdays.
Power Take Off Speeds:
Standard 540/1000 RPM PTO capabilities for powering various implements.
Engine Oil Change Interval:
Typically every 250 hours of operation, consult manual for exact specifications.
Hydraulic Fluid Change Interval:
Typically every 1000 hours of operation, consult manual for exact specifications.
Air Cleaner Servicing:
Regular checks and cleaning/replacement based on operating conditions (dusty environments require more frequent service).
Engine Oil Type:
API CD or CE rated diesel engine oil (e.g., 15W-40), consult manual for precise viscosity and API rating.
Hydraulic Transmission Fluid Type:
IH Hy-Tran B or equivalent UTF (Universal Tractor Transmission fluid) meeting IH specification B-6.
Coolant Type:
Ethylene glycol-based antifreeze with appropriate corrosion inhibitors for diesel engines. Consult manual for mix ratio.
Transmission Oil Type:
IH Hy-Tran B or equivalent UTF for all transmission and hydraulic systems.
Common Wear Points:
Clutch wear, PTO engagement issues, hydraulic pump and valve wear, transmission shifting problems (especially in older PST units), front axle pivot wear, electrical system component failure (wiring harnesses, switches).
Engine Performance Problems:
Potential for hard starting in cold weather, power loss due to fuel system or turbocharger issues, and coolant leaks.
Manufacturer Legacy:
International Harvester, a historically significant American manufacturer of agricultural and construction equipment, known for its robust and reliable machinery.
Series Context:
Part of IH's popular 86 series tractors, representing a significant advancement in tractor design and technology during their production era. Replaced earlier models and set new standards for power and comfort.
Production Years Approx:
1977-1981 (exact start/end may vary by specific model variant)
