International Harvester

International Harvester 1566

The International Harvester 1566 is a row-crop tractor produced from 1974 to 1976 as part of the 66 Series. Built in Rock Island, Illinois, USA, a total of 7,417 units were made. It features a turbocharged 7.1L 6-cylinder diesel engine producing 183 hp, with a 12-speed two-speed power shift transmission. The tractor has a two-wheel drive with planetary final drives, hydraulic wet disc brakes, and an open operator station with an optional air-conditioned cab. It includes an open center hydraulic system with optional front and rear valves, and a rear independent PTO rated at 1000 RPM. Dimensions include a 105-inch wheelbase, 168-inch length, and a width of 112 inches over axle ends. The tractor weighs between 13,200 and 15,195 pounds depending on configuration.

Power183 hp

Founded1974 - 1976

Model1566

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Technical Specifications

Detailed specifications and technical data for International Harvester 1566

Power

Engine	183 hp (136.5 kW)
PTO (tested)	161.01 hp (120.1 kW)
PTO (claimed)	160 hp (119.3 kW)
Drawbar (tested)	137.00 hp (102.2 kW)

Engine

Type	turbocharged diesel
Model	International Harvester DT-436
Power	183 hp (136.5 kW)
Cooling	liquid-cooled
Idle RPM	900-2600
Cylinders	6-cylinder
Fuel tank	42 gal (159.0 L), 82 gal Optional (310.4 L)
Rated RPM	2600
Bore/Stroke	4.30x5.00 inches (109 x 127 mm)
Compression	16:1
Displacement	436 ci (7.1 L)
Oil capacity	20 qts (18.9 L)
Coolant capacity	26 qts (24.6 L)

Weight

Shipping	13200 lbs (5987 kg)
Ballasted	18260 lbs (8282 kg)
Operating	15195 lbs (6892 kg)

Electrical

Charging system	alternator

Hydraulics

Type	open center
Pump flow	12 gpm (45.4 lpm)
Rear valves	2 Optional
Front valves	2 Optional

Mechanical

Drive	Two-wheel drive
Brakes	Hydraulic wet disc brakes
Final drives	planetary
Power steering	Yes
Operator station	Open operator station. Cab available with air-conditioning.

Production

Type	Row-Crop tractor
Series	66 Series
Built in	Rock Island, Illinois, USA
Total built	7,417
Original price	$26,250 in 1976
Years produced	1974 - 1976

Transmission

Type	Torque Amplifier two-speed power shift
Gears	12 forward and 6 reverse

Tractor hitch

Control	lower-link draft sensing
Rear Type	III/II

Serial Numbers

1974	7101
1975	7837
1976	12589
Location	Serial number plate on the left side of the clutch housing.

Dimensions & Tires

Width	112 inches (284 cm) Width over axle ends
Length	168 inches (426 cm)
Rear tire	20.8-38
Wheelbase	105 inches (266 cm)
Front tire	11L-15
Rear tread	66 to 120 inches (167 to 304 cm)
Front tread	62 to 86 inches (157 to 218 cm)
Height (cab)	117 inches (297 cm)
Height (exhaust)	125 inches (317 cm)
Clearance (drawbar)	17 inches (43 cm)
Front tread (optional)	56 to 80 inches (142 to 203 cm)