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John Deere 644G

John Deere 644G tractor
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The John Deere 644G is a wheel loader manufactured by John Deere from 1992 to 1998. It features a John Deere 7.6L 6-cylinder turbocharged aftercooled diesel engine producing 170 hp net and 178 hp gross. The loader has a 4-speed power shift transmission with 4 forward and 3 reverse gears. It is equipped with four-wheel drive, articulated power steering, hydraulic wet disc brakes, and a four-post ROPS canopy with an optional air-conditioned cab. The hydraulics system is open center with 3000 psi pressure and 69.5 gpm pump flow. Dimensions include a 126 inch wheelbase, 310.4 inch length, and an operating weight of 35236 lbs. The loader attachments provide a breakout force of 34171 lbs, a 55° dump angle, and a bucket width of 112.2 inches. Tires are industrial size 20.5-25 or 23.5-25 front and rear. Electrical system uses a 12 volt battery with negative ground and alternator charging.
John Deere 644Gwheel loaderJohn Deere 6076A engine7.6L diesel170 hp4-speed power shiftloader attachmentsindustrial tires
Power-
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Model644G

Technical Specifications

Detailed specifications and technical data for John Deere 644G

Power

Engine (net):170 hp (126.8 kW)
Engine (gross):178 hp (132.7 kW)

Tires

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

Engine

Type:turbocharged aftercooled diesel
Model:John Deere 6076A
Torque:598 lb-ft (810.9 Nm)
Cooling:liquid-cooled
Starter:electric
Cylinders:6-cylinder
Fuel tank:75 gal (283.9 L)
Rated RPM:2200
Torque RPM:1300
Air cleaner:dry
Bore/Stroke:4.56x4.75 inches (116 x 121 mm)
Power (net):170 hp (126.8 kW)
Displacement:466 ci (7.6 L)
Oil capacity:25 qts (23.7 L)
Power (gross):178 hp (132.7 kW)
Starter volts:12
Coolant capacity:3000 qts (2839.2 L)

Dimensions

Width:107.6 inches (273 cm)
Length:310.4 inches (788 cm)
Wheelbase:126 inches (320 cm)
Rear tread:85.4 inches (216 cm)
Front tread:85.4 inches (216 cm)
Height (cab):134.7 inches (342 cm)
Height (exhaust):124.4 inches (315 cm)
Operating weight:35236 lbs (15983 kg)

Electrical

Ground:negative
Battery volts:12
Charging system:alternator

Hydraulics

Type:open center
Pressure:3000 psi (206.8 bar)
Pump flow:69.5 gpm (263.1 lpm)

Mechanical

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

Production

Category:Wheel Loader
Years made:1992 - 1998
Manufacturer:John Deere

Attachments

Dump time:1.8s
Dump angle:55°
Lower time:3.9s
Raise time:6.2s
Bucket width:112.2 inches (284 cm)
Reach (dumped):45 inches (114 cm)
Height (at pin):157.9 inches (401 cm)
Clearance (dumped):111.3 inches (282 cm)
Loader breakout force:34171 lbs (15499 kg)
Rollback (ground line):40.1°

Transmission

Type:power shift
Gears:4 forward and 3 reverse