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International Harvester 743

The International Harvester 743 is a 2-wheel drive or 4-wheel drive farm tractor. This model was manufactured between 1981 and 1985. The International Harvester 743 is equipped with a 239 cubic inches (3.9L) IH D239 four-stroke four-cylinder direct injection naturally aspirated liquid-cooled diesel engine with a rated power of 67 hp (50 kW) and 235 Nm (173 lb-ft) of maximum torque at 1600 rpm.

The Synchron transmission consists of a dry clutch and 2-speed powershift gearbox with 16 forward and 8 reverse gears. Max travel speed (forward/reverse): 18.6 mph (29.9 kph) and 10 mph (16.1 kph).

The open center hydraulic system includes a gear pump with a rated capacity of 7.9 gal/min (29.9 l/min). The hydraulic pressure is 167 bar (2450 psi). The 2-wheel drive models are equipped with 7.50x16 front tires and 16.9x30 rear tires. The 9.50x24 front tires and 16.9x30 rear tires are used for tractors with 4-wheel drive. The wheel base is 87.7 in (2220 mm) for 2WD models and 86.6 in (2190 mm) for 4WD models.

Engine Model International Harvester D-239
Engine Type 4-stroke, 4-cylinder liquid-cooled diesel
Number of Cylinders 4
Displacement, cu in (L) 239 (3.92)
Engine Bore, in (mm) 3.87 (99.0)
Engine Stroke, in (mm) 5.06 (129.0)
Aspiration Natural
Rated Engine Power, hp (kW) 67.0 (50.0)
Rated Engine Speed, rpm 2300
Maximum Torque, Nm (ft-lbs) 235 (173)
Torque Speed, rpm 1600
Compression 15:1
Fuel System Direct injection
Fuel Tank Capacity, gal (L) 28.0 (106.0)
Oil Capacity, qts (L) 9.5 (9.0)
Coolant Capacity, qts (L) 18.5 (17.5)
Electrical System Rating, Volts 12
Charging System Alternator
Alternator Rating, Amps 55

Power Take-Off
PTO Operational Type Independent
PTO Horsepower, hp (kW) 55.8 (41.4)
PTO Clutch Type Hydraulic
PTO Speeds, rpm 540

Transmission Type Synchron
Gearbox Type 16F/8R, 2-speed powershift
Number of Forward Gears 16
Number of Reverse Gears 8
Clutch Type Dry disc
Maximum Forward Speed, mph (kph) 18.6 (29.9)
Maximum Reverse Speed, mph (kph) 10.0 (16.1)

Wheels and Tires
Drive Wheels 2WD/4WD
Steering Configuration Front Steer
Steering System Hydrostatic power
Brakes Type Hydraulic wet disc
Front Tire Size (2WD) 7.50x16
Rear Tire Size (2WD) 16.9x30
Front Tire Size (4WD) 9.50x24
Rear Tire Size (4WD) 16.9x30
Front Tread, in (mm) 52.9-73.1 (1340-1850)
Rear Tread, in (mm) 58-77.7 (1470-1970)

Hydraulic System
Hydraulic System Type Open Center
Implement Pump Flow, gpm (Lpm) 7.9 (29.9)
Hydraulic Capacity, gal (L) 3.2 (12.1)
Hydraulic Pressure, Bar (psi) 167 (2450)
Number of Standard Remote Valves 1/2
3-Point Hitch Category 2
Standard Lift Capacity at lift pin, lb (kg) 6945 (3150)

Dimensions and Weight
Wheelbase (2WD), in (mm) 87.7 (2220)
Wheelbase (4WD), in (mm) 86.6 (2190)
Length, in (mm) 148.8 (3780)
Height (Cab), in (mm) 103.2 (2620)
Ground Clearance, in (mm) 21.9 (550)
Turning Radius, in (mm) 178 (4500)
Weight (2WD), lb (kg) 6850 (3115)
Weight (4WD), lb (kg) 7720 (3510)



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