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International Harvester

International Harvester 766 826 966 1026 1066 TractorService Repair Manual

International Harvester 766 826 966 1026 1066 TractorService Repair Manual

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Machine data plateRef 63945
Brand
International Harvester
Equipment
Tractors
Models covered
Farmall Series
Format
PDF, searchable, print-ready
Delivery
Instant download after checkout
Language
English

What happens after you pay

  • Download link opens on the order page immediately
  • The same link is emailed to you — re-download any time
  • Open on phone, tablet or PC; print only the pages you need
  • Not sure it covers your serial range? Ask us before you buy
🏷️ Basic Information
Identification
Make:
International Harvester (IH)
Model:
766, 826, 966, 1026, 1066
Model Variants:
N/A - specific trims not listed for these models
Production Years:
1967-1972 (766), 1971-1974 (826), 1971-1975 (966), 1971-1972 (1026), 1971-1976 (1066)
👋 Introduction
Market Position
Target Audience:
Farmers, ranchers, and agricultural contractors requiring reliable row-crop tractors
Competitive Analysis
Advantage:
Robust construction, high fuel efficiency, and easy maintenance compared to similar era competitors
Key Features
Engine:
Powerful inline 6-cylinder diesel engines with high torque rise
Hydraulics:
Advanced hydraulic system with draft control and position control
Power Take-Off:
Independent PTO with 1000 RPM option
📋 Manual Details
Coverage
Manual Coverage:
These models are covered in this comprehensive service manual.
Page Count:
Over 1,000 pages
Publication
Manual Type:
Factory Service Repair Manual
Language:
English
Format / Delivery:
PDF download - instant access
📖 Manual Coverage
Systems Covered
Engine:
Complete overhaul and repair procedures for engine components
Fuel System:
Fuel tank, pump, injectors, and injection pump calibration
Electrical System:
Battery, alternator, starter, wiring diagrams, and lights
Power Train:
Clutch, transmission, drive shaft, and differential
Hydraulic System:
Pump, valves, cylinders, and hydraulic lines
Steering:
Power steering unit and link components
Brakes:
Disc brakes and brake system components
Cooling System:
Radiator, water pump, thermostat, and hoses
Exhaust System:
Muffler and exhaust pipe
Chassis:
Frame, suspension, and wheel hubs
Power Take-Off:
Independent PTO, clutch, and controls
Procedures Included
Disassembly & Assembly:
Step-by-step procedures with part breakdowns
Inspection & Testing:
Detailed specifications and tolerance checks
Servicing & Maintenance:
Routine service and maintenance schedules
Fault Diagnosis:
Troubleshooting charts and symptom-based diagnosis
Technical Depth
Level:
Comprehensive, for both professional and DIY mechanics
Parts Information
Part Numbers:
Genuine IH part numbers and illustrations
📊 Manual Specifications
File Format
File Type:
PDF (Portable Document Format)
Compatibility:
All devices with a PDF viewer (Windows, Mac, Android, iOS)
Requirements:
PDF reader software
Searchability:
Text, searchable and printable
Print Details
Print Quality:
High-resolution scanned or digital images
Binding:
Digital
Paper Type:
N/A - Digital download
⚙️ Engine Specifications
Primary Engine
Engine Options:
766: DT-358 diesel; 826: D-358 diesel; 966: D-407 diesel; 1026: D-414 diesel; 1066: DT-436 diesel
Performance:
Power outputs varied from 70 hp (766) to 125 hp (1066) at PTO
Fuel System:
Direct injection, naturally aspirated or turbocharged on certain models
🔧 Transmission
Standard Transmission
Type:
8-speed manual, unsynchronized
Optional Transmission
Type:
Torque amplifier (TA) providing 16 speeds for 826, 966, 1026, 1066; 12 speeds for 766
Features
Shift Pattern:
2 levers, multiple gear choices with TA providing under-drive
📐 Dimensions
Exterior
Wheelbase:
Approximately 105 inches (all models)
Length:
Approximately 180 inches (all models)
Weights
Curb Weight:
Range from approximately 8,000 lbs (766) to 11,000 lbs (1066)
🛡️ Safety Features
Ratings
Crash Test Information:
N/A - Not applicable for agricultural tractors
Active Features
Steering:
Power steering standard on all models
Brakes:
Hydraulic disc brakes
Passive Features
Rollover Protection:
Aftermarket ROPS may be available - not factory original
💡 Technology Features
Infotainment
Audio System:
N/A - Not applicable
Driver Assistance
Hydraulic Lift Control:
Draft and position control for consistent working depth
PTO:
Independent PTO with electric or hydraulic engagement
🔧 Maintenance
Service Intervals
Oil Change:
Every 100 hours (engine), 500 hours (transmission/hydraulic)
Filter Replacement:
Air and fuel filters annually or every 500 hours
Fluid Specifications
Engine Oil:
CD or CC quality, SAE 30 or 10W-30
Transmission/Hydraulic Oil:
IH Hy-Tran fluid
Coolant:
50/50 mix without nitrites
Known Issues
Common Wear Items:
Injector nozzles, clutch discs, hydraulic seals, and brake linings
📚 Vehicle History
Brand Heritage
Manufacturer:
International Harvester, a leading American agricultural equipment manufacturer
Model Evolution
Series:
These models were part of the successful 66 series that succeeded the 56 series
Production Location
Plant:
Manufactured in Rock Island, Illinois, USA
🏆 Awards & Recognition
Recognition
Industry Recognition:
Proven reliability and production longevity from 1967 to 1976

Delivery & file format

This is a digital PDF download, not a printed book. After payment the download link appears on your order confirmation page and is emailed to the address you entered. Files open in any PDF reader on phone, tablet or computer and can be printed.

Check the serial range before you buy

Manufacturers change procedures and part numbers by serial-number break. If your data plate shows a serial prefix that is not listed above, contact us with the model and serial number and we will confirm coverage before you order.

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  • Instant download PDF link on your order page and by email right after payment.
  • Secure checkout Encrypted Shopify checkout — we never see your card.
  • Print-ready PDF Searchable text, print the pages you need for the workshop.
  • Phone, tablet, PC Open it in the cab, the workshop or the office.