The International Harvester 644 is a tractor with a rated power output of 60 hp, positioning it at the lighter end of its class. It was manufactured from 1974 to 1980. The 644 features a 4-cylinder diesel liquid-cooled engine, paired with mechanical front-wheel drive and an 8-speed gearbox. Its operating weight is listed at 6350 to 7078 pounds, and it is suitable for operations covering up to 200 acres.
Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.
Rated power
60 hp
Weight
6350 to 7078 pounds
Catalogue coverage
Variants represented
2
Richest spec table
39 rows
Recorded power
60 hp
Recorded weight
2880 kg
Transmissions
8-speed
Production years
1974-1980
Verified variants
0
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Overview
ManufacturerInternational HarvesterReference
Row-Crop tractorReference
Built in Neuss, GermanyReference
Two- or four-wheel driveReference
Manual steeringReference
Open operator station.Reference
Engine
International Harvester 3.4L 4-cyl dieselReference
Fuel tank74.2 LReference
Engine44.7 kWReference
International Harvester D-206Reference
dieselReference
4-cylinderReference
liquid-cooledReference
Displacement3.4 LReference
Bore/Stroke98 x 111 mmReference
Power44.7 kWReference
Rated RPM2150Reference
Starter volts12Reference
Transmission
8-speedReference
Gears8 forward and 4 reverseReference
PTO & Hydraulics
Pump flow29.9 lpmReference
Rear TypeIIReference
Rear lift2900 kgReference
Rear PTO Type540/1000Reference
Engine RPM540@1982Reference
Engine RPM1000@2000Reference
Dimensions
Wheelbase223 cmReference
Weight6350 to 7078 poundsReference
Front tire7.50-16Reference
Rear tire16.9-30Reference
Ag front7.50-16Reference
Ag front9.5-24 (MFWD)Reference
Ag rear16.9-30Reference
Length377 cmReference
Height248 cmReference
2WD Weight2880 kgReference
4WD Weight3210 kgReference
Electrical
GroundnegativeReference
Battery volts12Reference
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.
