John Deere industrial tractors

John Deere 644D

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.

Power-

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Model644D

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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)