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International Harvester 666

International Harvester 666 tractor
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The International Harvester 666 is a row-crop tractor produced from 1972 to 1976 by International Harvester in Rock Island, Illinois, USA. It was available with either a 5.1L 6-cylinder diesel or a 4.8L 6-cylinder gasoline engine, both producing 75 hp gross. The tractor featured multiple transmission options including 5-speed sliding gear, hydrostatic, and a 10-speed two-speed power shift with torque amplifier. It had a power steering system, dry disc brakes, and an open operator station with optional ROPS, canopy, or cab with air-conditioning. The 666 had a wheelbase of 103 inches and weighed between 6780 and 7420 pounds depending on configuration. It was equipped with an IH Fast Hitch and an independent 540 rpm rear PTO. A torque amplifier was optional, and the hydrostatic version was renamed the 70 Hydro in 1973. A total of 9,367 units were built.
International Harvester 666IH 666tractor specificationsfarm tractordiesel tractorgasoline tractor75 hp tractorrow-crop tractor
Power75 hp
Founded1972 - 1976
Model666

Technical Specifications

Detailed specifications and technical data for International Harvester 666

Power

PTO (tested):69.61 hp (51.9 kW)
PTO (claimed):65 hp (gear) (48.5 kW), 69 hp (hydro) (51.5 kW)
Engine (gross):75 hp (55.9 kW)
Drawbar (tested):58.01 hp (43.3 kW)
Drawbar (claimed):57 hp (gear) (42.5 kW), 54 hp (hydro) (40.3 kW)

Engine

Diesel type:diesel
Gasoline type:gasoline
Diesel cooling:liquid-cooled
Engine options:International Harvester 5.1L 6-cyl diesel, International Harvester 4.8L 6-cyl gasoline
Diesel cylinders:6-cylinder
Diesel rated RPM:2000
Gasoline cooling:liquid-cooled
Diesel air cleaner:dual stage dry
Diesel bore/stroke:3.875x4.410 inches (98 x 112 mm)
Diesel compression:17:1
Diesel fuel system:direct injection
Gasoline cylinders:6-cylinder
Gasoline rated RPM:2000
Diesel displacement:312 ci (5.1 L)
Diesel engine model:International Harvester D312
Diesel power (gross):75 hp (55.9 kW)
Diesel starter volts:12
Gasoline air cleaner:dual stage dry
Gasoline bore/stroke:3.75x4.39 inches (95 x 112 mm)
Gasoline compression:7.5:1
Gasoline displacement:291 ci (4.8 L)
Gasoline engine model:International Harvester C291
Gasoline power (gross):75 hp (55.9 kW)
Gasoline starter volts:12
Diesel coolant capacity:21 qts (19.9 L)
Gasoline coolant capacity:21 qts (19.9 L)
Fuel tank capacity (diesel):31 gal (117.3 L)
Fuel tank capacity (gasoline):33 gal (124.9 L)

Electrical

Battery volts:12
Charging system:alternator

Hydraulics

Type:open center
Pump flow:12 gpm (45.4 lpm)

Mechanical

Drive:Two-wheel drive
Brakes:Dry disc brakes
Steering:Power steering
Operator station:Open operator station. Two-post ROPS or canopy optional. Cab available with air-conditioning.

Production

Type:Row-Crop tractor
Notes:Torque amplifier was an option. In 1973, the hydrostatic version of the 666 was renamed the 70 Hydro.
Built in:Rock Island, Illinois, USA
Total built:9,367
Original price:$11,875
Years produced:1972 - 1976

Transmission

Clutch:dry disc
Transmission options:5-speed, hydrostatic, 10-speed two-speed power shift
Hydrostatic transmission:infinite forward and reverse
Sliding gear transmission:5 forward and 1 reverse
Torque-Amplifier transmission:two-speed power shift, 10 forward and 2 reverse

Tractor hitch

Type:IH Fast Hitch
Rear Type:II

Serial Numbers

1972:7500
1973:8200
1974:11585
1975:13131
1976:15739
Location:Clutch housing, right side

Dimensions & Tires

Width:87 inches (220 cm)
Length:161 inches (408 cm)
Rear tire:15.5-38
Wheelbase:103 inches (261 cm)
Front tire:7.50-16
Rear tread:50 to 96 inches (127 to 243 cm)
Front tread:50 to 74 inches (127 to 187 cm), 56 to 80 inches (142 to 203 cm)
Shipping weight:6780 lbs (gas gear) (3075 kg), 7420 lbs (diesel hydro) (3365 kg)
Clearance (drawbar):14 inches (35 cm)
Clearance (front axle):21 inches (53 cm)
Height (steering wheel):77 inches (195 cm)

Power Take-off (PTO)

Rear PTO:independent
Rear PTO Type:540 (1.375)

Related Models

International Harvester 686

Model:686

International Harvester 656

Model:656