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John Deere 644D

John Deere 644D tractor
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The John Deere 644D is a wheel loader produced from 1985 to 1986. It features a John Deere 7.6L 6-cylinder turbocharged diesel engine delivering 165 hp gross and 155 hp net power. The loader has a 4-speed power shift transmission with 4 forward and 2 reverse gears. It includes four-wheel drive, articulated power steering, hydraulic wet disc brakes, and a four-post ROPS with canopy, with an optional cab featuring air-conditioning. The hydraulic system is open center with 2625 psi pressure and 63 gpm pump flow. Dimensions include a 115 inch wheelbase, 276.7 inch length, and operating weight of 29320 lbs. The loader attachment offers a lift capacity of 14680 lbs at full pin height and breakout force of 24430 lbs, with a bucket width of 104.75 inches. Tires are industrial size 20.5-25 and 16.00-24 among others. Electrical system includes an alternator, two 12-volt batteries with 625 CCA each.
John Deere 644Dwheel loadertractorspecificationsenginetransmissiondimensionshydraulicsattachments
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Model644D

Technical Specifications

Detailed specifications and technical data for John Deere 644D

Power

Engine (net):155 hp (115.6 kW)
Engine (gross):165 hp (123.0 kW)

Tires

Industrial rear:20.5-25, 16.00-24, 23.5-25
Industrial front:20.5-25, 16.00-24, 23.5-25

Engine

Type:turbocharged diesel
Model:John Deere 6-466T
Torque:480 lb-ft (650.9 Nm)
Cooling:liquid-cooled
Starter:electric
Cylinders:6-cylinder
Fuel tank:67 gal (253.6 L)
Rated RPM:2200
Torque RPM:1400
Air cleaner:dry
Bore/Stroke:4.56x4.75 inches (116 x 121 mm)
Power (net):155 hp (115.6 kW)
Displacement:466 ci (7.6 L)
Oil capacity:20 qts (18.9 L)
Power (gross):165 hp (123.0 kW)
Starter volts:12
Coolant capacity:29 qts (27.4 L)

Dimensions

Length:276.7 inches (702 cm)
Wheelbase:115 inches (292 cm)
Rear tread:80 inches (203 cm)
Front tread:80 inches (203 cm)
Height (ROPS):126 inches (320 cm)
Height (exhaust):123 inches (312 cm)
Operating weight:29320 lbs (13299 kg)

Electrical

Batteries:2
Battery CCA:625
Battery volts:12
Charging system:alternator
Cab Charging amps:90
ROPS Charging amps:42

Hydraulics

Type:open center
Pressure:2625 psi (181.0 bar)
Pump flow:63 gpm (238.5 lpm)

Mechanical

ROPS:Four-post ROPS with canopy. Cab optional with available air-conditioning.
Drive:Four-wheel drive
Brakes:Hydraulic wet disc brakes
Steering:Articulated power steering
Final drives:inboard planetary

Production

Type:Wheel Loader
Years made:1985 - 1986

Attachments

Dump time:2.0s
Dump angle:50°
Lower time:4.8s
Raise time:6.1s
Bucket width:104.75 inches (266 cm)
Reach (dumped):36.75 inches (93 cm)
Height (at pin):152 inches (386 cm)
Boom rod diameter:2.75 inches (6 cm)
Clearance (dumped):117 inches (297 cm)
Bucket rod diameter:3.00 inches (7 cm)
Loader breakout force:24430 lbs (11081 kg)
Boom cylinder diameter:6.25 inches (15 cm)
Rollback (ground line):40°
Bucket cylinder diameter:6.25 inches (15 cm)
Loader lift capacity (full at pin):14680 lbs (6658 kg)

Transmission

Type:power shift
Gears:4 forward and 2 reverse

Related Models

John Deere 544D

Model:544D

John Deere 644C

Model:644C