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 |
|---|---|---|
| Introduction | 7 | Hydrostatic Motor, High-Range Selector, Speed Ratio Control Lever, Foot-N-inch Pedal, Hydraulic Fluid Filters |
| Work Safely - Follow These Rules | 8-9 | Power Take-Off Lever, Engine Operation, Brakes and Clutch, Fluid Pressure, Transmission Neutral, Safety Shields |
| Instructions and Controls | 10-12 | Torque Amplifier Operating Lever, Tachometer - Speedometer, Engine Oil Pressure Telllite, Fuel Gauge, Key Switch, Brake Pedals |
| Before Operating Your New Tractor | 13 | Tractor Break-In Procedure, Lubrication, Tires, Air Cleaning System, Engine Cooling System, Fuel System |
| Driving the Tractor | 14-21 | Adjusting the Seat |
| Gasoline Engine and Fuel System | 22-24 | - |
| Diesel Engine and Fuel System | 25-32 | - |
| Hydraulic Controls for Hitchs | 33-36 | - |
| Three-Point Hitch | 37-42 | Rockshaft Arms, Leveling Screw Cranks, Hitch Upper Link, Hitch Lower Links, Lateral Limiters, Coupling the Equipment |
| Two-Point Hitch | 43-46 | Leveling Screw Cranks, Rockshaft Arms, Lift Links, Hitch Sockets, Lateral Limiters, Coupling the Equipment |
| Hitching Trailing Equipment to the Tractor | 47-50 | Fixed-Type Drawbar, Swinging Drawbar, Telescoping-Type Swinging Drawbar, Cross Drawbar, Lockout Brackets |
| Auxiliary Valves, Remote Cylinders and Hydraulic Outlets | 51-54 | Lever Actuated Couplers, Quick-Disconnect Couplers, Double-Action Cylinders, Single-Action Cylinders, Float Lockout, Air in the Hydraulic System |
| Power Take-Off | 55 | Independent Power Take-Off, Safety Shield, Clutch |
| Cooling System | 56-58 | Temperature Gauge, Filling the Cooling System, Adding Coolant, Cleaning the Cooling System, Radiator Core, Fan Belt Tension |
| Air Cleaning System | 59-60 | Dry-Type Air Cleaner, Service Air Cleaner Element, Air Cleaner Service Indicator, Removing and Cleaning the Filter Element, Automatic Dust Unloader |
| Elecctrical System | 61-66 | Charging System, Ignition System, Lighting System, Battery, Cranking System, Fuse |
| Front Wheels | 67-69 | Adjustable Wide-Tread Front Axle, Adjusting the Tread Widths, Adjusting the Toe-In |
| Rear Wheels | 70-73 | Adjusting the Tread Widths, Hub Clamp Stud Nuts, Assembling the Rear Wheel Double-Bead Rims, Reversing the Rear Wheels, Dual Rear Wheels, Hi-Clear Tractors |
| Weights | 74-77 | Front End Weights, Front End Weight Hold Down and Locking Device, Front Wheel Weights, Rear Wheel Weights (Two-Piece), Liquid Ballast Weight in Rear Tires |
| Tires | 78-79 | Inflation, Front Tire Inflation Pressures, Rear Tire Inflation Pressures |
| Brakes | 80 | Operating Rod, Brake Housing, Brake Pedals, Brake Pedal Latch, Brake Linkage, Free Pedal Travel |
| Clutches | 81-83 | Adjusting the Engine Clutch, Care of the Engine Clutch, Care of Torque Amplifier Clutch, Adjusting the Torque Amplifier Clutch |
| Storing the Tractor | 84 | Gasoline Engines, Diesel Engines, Cooling System, Fuel Tank, Clutch Pedal, Engine Lubricating Oil Filters |
| Cold Weather Precautions | 85 | Fuel System, Cooling System, Electrical, Lubrication |
| Lubrication | 86-92 | Engine Oil, Gear Lubricant, Gasoline Engine Filter Element, Diesel Engine Oil Filters, Hydraulic Fluid Filter, Front Wheels |
| Lubrication Table | 93 | Point of Lubrication, Anticipated Air Temperatures, Gasoline Engine Crankcase, Diesel Engine Crankcase, Gear Drive Transmission, Front Wheel Hubs |
| Lubrication Guide | 94-98 | Oil Level Gauge, Front Wheel Hub, Hydraulic Fluid Filter, Clutch Release Shaft, Brake Pedal, Transmission and Hydraulic System |
| Preventive Maintenance Guide | 99-100 | Hydraulic Fluid Filter, Water Pump, Cooling System, Air Cleaner, Fuel Filters, Battery |
| Specifications | 101-105 | Capacities, Engine, Electrical System, Clutch, Foot Brakes, General Dimensions |
| Optional Equipment | 106 | Adjustable Wide-Tread Front Axle, Double Auxiliary Hydraulic Valve, Front End Weights, Hydraulic Draft Control, Independent Power Take-Off, Three-Point Hitch |
| Universal Symbols for Instruments and Controls | 107 | Vehicle Direction, Fuel Level, Engine Temperature, Generator Light, Engine R.P.M., Power Take-Off |
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. p. 24
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 SystemTractor lacks pulling power under heavy loads and clutch pedal feels excessively loose or improperly adjusted. p. 82
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: ClutchesImplement operation feels slow and weak at the sickle bar despite engine revving up properly. p. 9
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 RulesFrequently Asked Questions
How to adjust the torque amplifier clutch on a Case IH 666 tractor?
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".
How do you service the fuel strainer and sediment bowl on a Case IH 666 tractor?
Clean the fuel strainer and sediment bowl every 200 hours of operation (p. 18). Close the fuel shut-off valve, remove it, then take the strainer apart by loosening the nut holding the sediment bowl. Clean the sediment bowl and screen. Reinstall and reopen the shut-off valve when done.
How do you check oil levels and service the filters on a Case IH 666 tractor?
Check engine oil level with the dipstick before each day of operation (p. 86). Use the correct viscosity grade specified in the Lubrication Table (p. 93) for your operating temperature. Service the Hydraulic Fluid Filter and Diesel Engine Oil Filters at the intervals specified in the Lubrication Guide (pp. 94-98). The transmission and hydraulic system share fluid — check at the designated fill point and maintain the level shown in the Lubrication Table.
How do you hook up and operate the three-point hitch on a Case IH 666 tractor?
Use the hydraulic hitch controls (pp. 33-36) to raise and lower the three-point hitch (pp. 37-42). Connect implement lower links to the hitch lower links and the upper link to the implement. Adjust the leveling screw cranks for level implement attitude. Use the Lateral Limiters to control side sway. For trailing equipment, use the swinging drawbar or fixed drawbar (pp. 47-50) and connect PTO shaft via the independent PTO (p. 55).
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