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International Harvester 644 Technical Data

IH 644 Engine Specifications

Engine Model ................. International Harvester D-206
Engine Type ................. 4-stroke, 4-cylinder liquid-cooled diesel
Number of Cylinders ................. Four
Displacement, cu in (L) ................. 206.4 (3.38)
Engine Bore, in (mm) ................. 3.87 (98.0)
Engine Stroke, in (mm) ................. 4.37 (111.0)
Aspiration ................. Natural
Rated Engine Power, hp (kW) ................. 60.0 (44.7)
Rated Engine Speed, rpm ................. 2150
Maximum Torque, Nm (ft-lbs) ................. 225 (166)
Torque Speed, rpm ................. 1400
Idle Speed, rpm ................. 700-2560
Compression ................. 15:1
Fuel System ................. Direct injection
Fuel Tank Capacity, gal (L) ................. 19.6 (74.2)
Electrical System Rating, Volts ................. 12
Charging System ................. Alternator

International Harvester 644 Power Take-Off

PTO Operational Type ................. Independent
PTO Horsepower, hp (kW) ................. 50.0 (37.3)
PTO Clutch ................. Dry disc
PTO Speeds, rpm ................. 540

Transmission Configuration

Transmission Type ................. Synchromesh
Gearbox Type ................. 8F/4R
Number of Forward Gears ................. 8
Number of Reverse Gears ................. 4
Clutch ................. Dry disc
Maximum Forward Speed, mph (kph) ................. 15.6 (25.1)
Maximum Reverse Speed, mph (kph) ................. 4.9 (7.8)

IH 644 Wheels and Tires

Drive Wheels ................. 2WD/4WD
Steering Configuration ................. Front Steer
Steering System ................. Hydrostatic power
Brakes Type ................. Hydraulic wet disc
Front Tire Size (2WD) ................. 7.50-16
Rear Tire Size (2WD) ................. 16.9-30
Front Tire Size (4WD) ................. 9.5-24
Rear Tire Size (4WD) ................. 16.9-30

International Harvester 644 Hydraulic System

Hydraulic System Type ................. Open Center
Implement Pump Type ................. Gear
Implement Pump Flow, gpm (Lpm) ................. 7.9 (29.9)
3-Point Hitch Category ................. 2
Standard Lift Capacity at lift pin, lb (kg) ................. 6395 (2900)

Dimensions and Weight

Wheelbase, in (mm) ................. 87.8 (2230)
Length, in (mm) ................. 148.8 (3780)
Height, in (mm) ................. 98.1 (2480)
Turning Radius, in (mm) ................. 178 (4500)
Weight (2WD), lb (kg) ................. 6350 (2880)
Weight (4WD), lb (kg) ................. 7078 (3210)