Target Audience:
Do-it-yourself tractor owners, farm mechanics, agricultural repair shops, and collectors of International Harvester equipment.
Value Proposition:
Provides essential, in-depth technical information at a fraction of the cost of dealership service, enabling cost-effective maintenance and repair.
Manual Features:
Detailed illustrations, wiring schematics, step-by-step instructions, troubleshooting guides, printable format, comprehensive system coverage.
Engine Mechanical:
Full overhaul, disassembly, inspection, assembly, torque specifications, timing, cooling system, lubrication system.
Engine Electrical:
Starting system, charging system, ignition system, lighting system, wiring diagrams, component testing.
Emission Control:
Details on emission control systems pertinent to the models' production era, including any related adjustments or maintenance.
Fuel System:
Fuel injection pump service, carburetor (if applicable), fuel filters, fuel lines, troubleshooting fuel delivery.
Suspension System:
Front axle articulation, pivot points, wheel bearings (if applicable to specific configurations).
Clutch System:
Clutch disassembly, inspection, adjustment, replacement, pressure plate, friction disc, release bearing.
Transmission Manual:
Gearbox overhaul, shifting mechanisms, gear train inspection, lubrication, troubleshooting.
Transmission Automatic:
Service procedures for any powershift or hydrostatic transmission options, including hydraulic systems and control linkages.
Driveshaft And Axle:
Rear axle disassembly and repair, differential service, PTO driveshaft, front drive axle (if equipped).
Steering System:
Hydraulic steering assist components, steering column, tie rods, adjustment, troubleshooting.
Brake System:
Hydraulic brake system service, master cylinder, wheel cylinders, brake discs/drums, parking brake mechanism.
Body Interior Exterior:
Sheet metal repair, cab mounting, fenders, operator controls, seat adjustment.
Body Electrical:
Instrument panel, lights, switches, battery maintenance, fused circuits, relevant wiring for accessories.
Restraint System:
Seat belts, ROPS (Roll Over Protective Structure) information and installation/maintenance considerations.
Maintenance:
Scheduled maintenance, lubrication charts, filter replacement, fluid changes, pre-operation checks.
Troubleshooting:
Diagnostic flowcharts for common problems, electrical troubleshooting guides, mechanical system diagnostics.
Repair:
Step-by-step instructions for component removal, disassembly, repair, reassembly, and installation for all major systems.
Installation:
Guidance on installing optional equipment or replacing major assemblies.
Depth Of Coverage:
Comprehensive: Covers everything from routine maintenance to complete engine, transmission, and hydraulic system rebuilds. Includes detailed diagnostic procedures.
Engine Types:
International Harvester DT-466 (diesel), D-358 (diesel), or other relevant IH diesel engines common to these models. Specific engine variants depend on exact tractor configuration.
Horsepower Range:
Typically ranging from approximately 70 HP for the 786 to over 100 HP for the 1086, depending on specific engine and configuration.
Torque Specifications:
Detailed torque values for critical engine components (e.g., cylinder head bolts, main bearing caps, connecting rod bolts) provided within the manual.
Fuel Injection:
Likely features Bosch or Roosa Master rotary injection pumps, with detailed service and calibration procedures.
Standard Transmission:
16-speed Power-Shift (Synchro-Range) transmission is common, often with 4 forward and 4 reverse gears in each of two ranges.
Optional Transmission:
Possibly a synchronized main transmission with a range splitter (e.g., 8-speed), depending on specific model year and configuration.
Transmission Fluid:
Typically requires specialized agricultural hydraulic fluid (e.g., IH Hy-Tran, or equivalent specification like UTF - Universal Tractor Transmission fluid) for transmission, hydraulics, and PTO.
Engine Oil Change:
Typically every 250 hours of operation or annually, with specific oil type and capacity detailed in the manual.
Transmission Fluid Change:
Intervals often range from 600 to 1200 hours, depending on usage and specific fluid recommendations. Includes checking hydraulic filter condition.
Engine Oil Spec:
API CD or CE grade diesel engine oil, typically SAE 30 or 15W-40 depending on climate. Specific viscosity and capacity will be listed.
Hydraulic Fluid Spec:
IH Hy-Tran, or equivalent UTF/M2C134-D fluid. Capacities for transmission, hydraulics, and PTO are significant and detailed.
Coolant Type:
Ethylene glycol-based antifreeze with corrosion inhibitors, mixed with distilled water. Manual specifies mix ratio and capacity.
Common Wear Points:
Wear in the transmission synchronizers, PTO clutch engagement, hydraulic pump and valve wear, and fuel injection pump calibration issues are common areas requiring attention with age.
Electrical Gremlins:
Age-related issues with wiring harness insulation, switch contacts, and battery terminals can lead to intermittent electrical problems.
Manufacturer History:
International Harvester (IH) was a major American manufacturer of agricultural and construction equipment. These tractors represent a significant era of IH's tractor development before its merger into Case IH.
Series Development:
These tractors were part of IH's popular '86' series, succeeding earlier models and incorporating advancements in comfort, power, and drivability for their time.
Production Years:
Mid-to-late 1970s through early 1980s (e.g., 786: 1976-1981, 886: 1976-1981, 986: 1976-1981, 1086: 1976-1981). Exact years may vary.
