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John Deere 644A

John Deere 644A tractor
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The John Deere 644A is a wheel loader manufactured by John Deere from 1971 to 1973. It features a turbocharged 6-cylinder 6.6L diesel engine producing 141 hp gross and 131 hp net. The loader has a 4-speed power shift transmission with torque converter and articulated power steering. It includes hydraulic wet disc brakes and a cab with heat as standard. The 644A has a wheelbase of 104 inches, operating weight of 26472 lbs, and uses industrial tires sized 20.5-25 or 17.5-25. The front-end loader attachment offers a breakout force of 23944 lbs, 45° dump angle, and a bucket width of 104.6 inches. It was succeeded by the John Deere 644B model produced from 1974 to 1980.
John Deere 644Awheel loadertractorspecsenginetransmissiondimensionshydraulicsattachments
Power-
Founded-
Model644A

Technical Specifications

Detailed specifications and technical data for John Deere 644A

Power

Engine (net):131 hp (97.7 kW)
Engine (gross):141 hp (105.1 kW)

Tires

Industrial rear:20.5-25, 17.5-25
Industrial front:20.5-25, 17.5-25

Engine

Type:turbocharged diesel, 6-cylinder, liquid-cooled
Model:John Deere 6.6L 6-cyl diesel
Torque:345 lb-ft (467.8 Nm)
Starter:electric
Fuel tank:50 gal (189.2 L)
Rated RPM:2400
Torque RPM:1600
Bore/Stroke:4.25x4.75 inches (108 x 121 mm)
Compression:16.5:1
Power (net):131 hp (97.7 kW)
Displacement:404 ci (6.6 L)
Oil capacity:17 qts (16.1 L)
Power (gross):141 hp (105.1 kW)
Starter volts:12
Coolant capacity:36 qts (34.1 L)

Height

Cab:127 inches (322 cm)
ROPS:122 inches (309 cm)
Exhaust:117 inches (297 cm)

Dimensions

Length:247.8 inches (629 cm)
Wheelbase:104 inches (264 cm)
Rear tread:80 inches (203 cm)
Front tread:80 inches (203 cm)
Ground clearance:15.9 inches (40 cm)
Operating weight:26472 lbs (12007 kg)

Electrical

Batteries:2
Battery volts:12
Charging system:alternator

Hydraulics

Type:open center
Pressure:2250 psi (155.1 bar)
Pump flow:60 gpm (227.1 lpm)
Steering flow:27 gpm (102.2 lpm)
Steering pressure:2000 psi (137.9 bar)

Mechanical

Cab:Cab standard with heat
Drive:Four-wheel drive
Brakes:Hydraulic wet disc brakes
Steering:Articulated power steering
Final drives:inboard planetary

Production

Type:Wheel Loader
Years made:1971 - 1973
Manufacturer:John Deere

Attachments

Type:front-end loader
Dump angle:45°
Bucket width:104.6 inches (265 cm)
Reach (dumped):34.75 inches (88 cm)
Height (at pin):142 inches (360 cm)
Clearance (dumped):110.5 inches (280 cm)
Loader breakout force:23944 lbs (10860 kg)
Rollback (ground line):42°

Transmission

Type:power shift
Gears:4 forward and 2 reverse
Details:Power shift transmission with torque converter. Automatic shift from 1-2 and 3-4.

Related Models

John Deere 644B

Model:644B