Positioning:
A comprehensive factory service manual for owners and mechanics of the International Harvester 986 tractor, designed to facilitate efficient and accurate repairs and maintenance.
Value Proposition:
Provides essential technical data and procedures that would otherwise require expensive dealer service, enabling cost savings and self-sufficiency for owners.
Feature 1:
All-encompassing coverage for repair and service.
Feature 2:
Structured layout with a table of contents for easy information retrieval.
Feature 3:
Focus on troubleshooting and addressing common issues.
Feature 4:
Digital format for convenient access and use on various devices.
Engine:
Yes, detailed service and repair for the engine.
Transmission:
Yes, service and repair of transmission systems.
Hydraulic System:
Likely covered given tractor application.
Electrical System:
Yes, including wiring diagrams.
Braking System:
Yes, service and repair.
Cooling System:
Yes, maintenance and repair.
Fuel System:
Yes, service and troubleshooting.
Steering System:
Yes, service and repair.
Operator Station:
Likely covered, including controls and comfort features.
Drivetrain:
Yes, including differential and final drives.
Power Take-Off Pto:
Likely covered for PTO operation and maintenance.
Routine Maintenance:
Yes, including schedules and fluid specifications.
Troubleshooting:
Yes, dedicated troubleshooting guides.
Component Disassembly Reassembly:
Yes, detailed step-by-step instructions.
Diagnostic Procedures:
Yes, for identifying and resolving issues.
Wiring Diagrams:
Yes, for electrical system diagnosis and repair.
Engine Overhaul:
Yes, detailed procedures for engine rebuilds.
Transmission Repair:
Yes, covering component replacement and adjustment within the transmission and torque amplifier.
Hydraulic System Service:
Yes, likely includes testing, component replacement (pumps, valves, cylinders), and fluid maintenance.
Electrical Diagnostics:
Yes, with wiring diagrams and fault finding charts.
Front Axle And Steering Service:
Yes, for repair and maintenance.
Rear Axle And Differential Service:
Yes, including disassembly and reassembly.
Power Take-Off Pto Service:
Yes, likely covers PTO clutch and drive mechanisms.
Front End Loader Installation And Service:
Potential coverage, as loaders were common attachments. Check manual details.
Depth:
Comprehensive, covering from routine maintenance to in-depth repairs and overhauls.
Accuracy:
Factory-level specifications, tolerances, and procedures, crucial for correct repair.
Diagrams:
Likely includes detailed exploded views, schematic diagrams, and troubleshooting flowcharts.
Special Tools:
Likely lists any special tools required for specific repair procedures.
Engine Model:
D-358 Diesel
Engine Type:
Direct Injection, Naturally Aspirated, 4-Cycle Diesel
Displacement:
358 cubic inches (5.87 Liters)
Bore X Stroke:
4.25 in. x 4.31 in. (108 mm x 110 mm)
Compression Ratio:
16.0:1 (Typical)
Horsepower Rated:
Approx. 96 PTO HP (Subject to specific configuration and model year)
Torque Peak:
Approx. 265 lb-ft @ 1300 RPM (Subject to specific configuration and model year)
Injection System:
Roos or Bosch inline injection pump (model dependent)
Fuel Filter Part Number:
Refer to manual for specific PN, e.g., WIX 33490 (example for similar engines).
Transmission Type:
David Brown 12-Speed "Power Shift" (Synchromesh with Torque Amplifier)
Number Of Gears Standard:
12 Forward, 4 Reverse (with Torque Amplifier)
Torque Amplifier:
Yes, provides 16 forward speeds and 4 reverse speeds via a 2-speed underdrive gear.
Transmission Fluid:
IH Hy-Trans Fluid (or equivalent agricultural lubricant meeting API GL-4 specifications).
Transmission Fluid Capacity:
Approx. 15 US quarts (14.2 Liters) (Check manual for exact capacity).
Engine Oil Change:
Typically every 250 hours of operation, or annually.
Fuel Filter Replacement:
Typically every 250-500 hours, or as needed.
Air Filter Cleaning Replacement:
Inspect frequently, clean/replace as needed, often based on operating conditions.
Engine Oil Specification:
API CD or higher, SAE 30W (or 15W-40 for broader temperature range). Check manual for exact spec.
Engine Oil Capacity:
Approx. 12 US quarts (11.4 Liters) with filter change.
Coolant Type:
Ethylene Glycol based coolant with appropriate anti-corrosion additives. Typically a 50/50 mix with distilled water.
Common Issue 1:
Hydraulic pump and system leaks/performance degradation.
Common Issue 2:
Torque amplifier engagement issues or wear.
Common Issue 3:
Electrical system gremlins, particularly related to wiring harness integrity and switches.
Common Issue 4:
Wear on clutch components and PTO clutch packs.
Common Issue 5:
Engine component wear (e.g., cylinder liners, pistons) due to age and operating hours.
Brand:
International Harvester (IH) was a major American manufacturer of agricultural and construction equipment, as well as trucks and automobiles.
Series Context:
The 986 was part of IH's popular 86 series tractors, known for their operator comfort and modern features for their time, succeeding models like the 686 and 574/674 series.
Production Years:
Approximately 1976 - 1981
Manufacturing Location:
USA (Rockford, Illinois, and Louisville, Kentucky plants were common for IH tractors).
