Part of the Case IH Operator Manuals.
Need the factory operator's guide for your Case IH 666 Tractor or Hi-Clear model? This 118-page manual (OEM #1084168R1) walks you through every control, system, and scheduled service interval, covering both gear drive and hydrostatic configurations. Inside: a full instrument panel walkthrough covering oil pressure telllite, tachometer-speedometer, and fuel gauge, plus hitch setup for three-point and two-point connections, PTO operation, auxiliary hydraulic valves, and remote cylinder hookups. You also get a Lubrication Table, Preventive Maintenance Guide, fluid capacities, cold weather precautions, and a specifications section covering engine, clutch, brakes, and general dimensions. Set the gasoline engine crankcase to 8 quarts before startup, and check torque amplifier clutch release clearance at .025 to .040 inch with a feeler gauge. Your dealer is 40 miles out and the season won't wait. Search by keyword, jump straight to the section, and get your 666 back in the field.
What's Inside This Case IH 666, Hi-Clear Model Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety & Introduction | 7-9 | Hydrostatic Motor, High-Range Selector, Speed Ratio Control Lever, Foot-N-Inch Pedal, Hydraulic Fluid Filters, Power Take-Off Lever, Brakes and Clutch, Transmission Neutral, Safety Shields |
| Instruments, Controls & Getting Started | 10-21 | Torque Amplifier Operating Lever, Tachometer-Speedometer, Engine Oil Pressure Telltale, Fuel Gauge, Key Switch, Brake Pedals, Tractor Break-In Procedure, Lubrication, Tires, Air Cleaning System, Engine Cooling System, Adjusting the Seat |
| Engine & Fuel System | 22-32 | Gasoline Engine and Fuel System, Diesel Engine and Fuel System |
| Hitches & Attachments | 33-50 | Rockshaft Arms, Leveling Screw Cranks, Hitch Upper Link, Hitch Lower Links, Lift Links, Hitch Sockets, Lateral Limiters, Coupling the Equipment, Fixed-Type Drawbar, Swinging Drawbar, Telescoping-Type Swinging Drawbar, Lockout Brackets |
| Hydraulic Outlets & Power Take-Off | 51-55 | Lever Actuated Couplers, Quick-Disconnect Couplers, Double-Action Cylinders, Single-Action Cylinders, Float Lockout, Independent Power Take-Off, Safety Shield, Clutch |
| Cooling & Air Cleaning Systems | 56-60 | Temperature Gauge, Filling the Cooling System, Radiator Core, Fan Belt Tension, Dry-Type Air Cleaner, Air Cleaner Service Indicator, Automatic Dust Unloader |
| Electrical System | 61-66 | Charging System, Ignition System, Lighting System, Battery, Cranking System, Fuse |
| Wheels, Tires & Weights | 67-79 | Adjustable Wide-Tread Front Axle, Adjusting Tread Widths, Adjusting Toe-In, Hub Clamp Stud Nuts, Dual Rear Wheels, Front End Weights, Rear Wheel Weights, Liquid Ballast Weight, Tire Inflation Pressures |
| Brakes & Clutches | 80-83 | Operating Rod, Brake Housing, Brake Pedals, Brake Linkage, Free Pedal Travel, Engine Clutch, Torque Amplifier Clutch |
| Storage & Seasonal Care | 84-85 | Cooling System, Fuel Tank, Clutch Pedal, Engine Lubricating Oil Filters, Cold Weather Precautions, Electrical |
| Lubrication & Preventive Maintenance | 86-100 | Engine Oil, Gear Lubricant, Hydraulic Fluid Filter, Oil Level Gauge, Clutch Release Shaft, Water Pump, Fuel Filters, Battery |
| Specifications & Reference | 101-107 | Capacities, Engine, Electrical System, Clutch, Foot Brakes, General Dimensions, Optional Equipment, Universal Symbols for Instruments and Controls |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 666 Tractor (Gear Drive) | ||
| Torque amplifier clutch proper release adjustment | .025 to .040 inch | p. 82 |
| All Models | ||
| Battery terminal clamps and posts condition | kept clean and tight | p. 60 |
| Action for flashing oil pressure tellite after engine start | shut off the engine and check the oil level in the crankcase | p. 24 |
| Hydraulic system connection and hose condition | Make sure all connections are tight and that hoses and lines are in good condition before applying pressure to the system. | p. 9 |
| Gasoline Engine Crankcase Capacity (w/o filter change) | 8 qts. | p. 93 |
| Gasoline Engine Crankcase Capacity (w/filter change) | 9 qts. | p. 93 |
| Diesel Engine Crankcase Capacity (w/o filter change) | 11 qts. | p. 93 |
| Diesel Engine Crankcase Capacity (w/filter change) | 12 qts. | p. 93 |
| Gear Drive Transmission and Differential Case Capacity | 16 gal. | p. 93 |
| Hydrostatic Drive Unit and Differential Case Capacity | 20 gal. | p. 93 |
| Hi-Clear Model | ||
| Rear Axle Housings Capacity (Hi-Clear Tractors only) | 3 qts. | p. 93 |
Case IH 666, Hi-Clear Model Common Problems This Manual Covers
Case IH 666 tractor engine starts but oil pressure tellite keeps flashing on the dashboard.
Shut off the engine immediately and check the oil level in the crankcase as noted on page 24. For gasoline engines, verify the fluid capacity measures exactly 8 qts without a filter change. Inspect the oil pressure tellite sensor wiring for damage.
Manual Section: Gasoline Engine and Fuel System p. 24Tractor lacks pulling power under heavy loads and clutch pedal feels excessively loose or improperly adjusted.
Remove the torque amplifier clutch cover on gear drive models. Check the proper release adjustment with a feeler gauge as outlined on page 82. Adjust the linkage clearance to exactly .025 to .040 inch. Verify the engine clutch pedal free travel operates smoothly.
Manual Section: Clutches p. 82Implement operation feels slow and weak at the sickle bar despite engine revving up properly.
Inspect all hydraulic system connections to ensure they are tight before applying pressure on page 9. Verify the hydrostatic drive unit and differential case reservoir contains exactly 20 gal of fluid. Examine the hydraulic pump suction tube closely for obvious hairline cracks.
Manual Section: Work Safely - Follow These Rules p. 9Frequently Asked Questions
How to reset the torque amplifier on an IH 666
To adjust the torque amplifier clutch, remove spring "F" and adjust the engine clutch free pedal travel to 1-3/4-inches as instructed on page 77. Then loosen the torque amplifier adjusting screw "E" in the cam lever outer plate and remove pin "J" from clevis "K" and loosen nut "H". p. 77
What format is this Case IH 666 Tractor, International Farmall 666 Series?
You get a 118-page searchable PDF (20 MB) that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Am I able to print pages from this Case IH 666 Tractor, International Farmall?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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