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John Deere 644B

John Deere 644B tractor
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The John Deere 644B is a wheel loader produced from 1974 to 1980. It features a John Deere 8.7L 6-cylinder turbocharged intercooled diesel engine producing 160 hp gross and 145 hp net. The loader has a 4-speed power shift transmission with 4 forward and 2 reverse gears, four-wheel drive with inboard planetary final drives, articulated power steering, and hydraulic wet disc brakes. It has a four-post ROPS with canopy and optional cab. The hydraulics system is open center with 2250 psi pressure and 62.5 gpm pump flow. Dimensions include a 104 inch wheelbase, 254.3 inch length, and operating weight of 28100 lbs. Tires are industrial 20.5-25 front and rear, with alternative 17.5-25 sizes. The front-end loader attachment has a breakout force of 24420 lbs, 45° dump angle, 34.3 inch reach, and 104.75 inch bucket width. Electrical system includes an alternator and two 12-volt batteries.
John Deere 644Bwheel loadertractorspecsenginetransmissiondimensionshydraulicsattachments
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Model644B

Technical Specifications

Detailed specifications and technical data for John Deere 644B

Power

Engine (net):145 hp (108.1 kW)
Engine (gross):160 hp (119.3 kW)

Tires

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

Engine

Type:turbocharged intercooled diesel
Model:John Deere 8.7L 6-cyl diesel
Torque:432 lb-ft (585.8 Nm)
Cooling:liquid-cooled
Starter:electric
Cylinders:6-cylinder
Fuel tank:56 gal (212.0 L)
Rated RPM:2200
Torque RPM:1500
Air cleaner:dry
Bore/Stroke:4.75x5.00 inches (121 x 127 mm)
Power (net):145 hp (108.1 kW)
Displacement:531 ci (8.7 L)
Oil capacity:24 qts (22.7 L)
Power (gross):160 hp (119.3 kW)
Starter volts:12
Coolant capacity:49 qts (46.4 L)

Height

Cab:127 inches (322 cm)
ROPS:121 inches (307 cm)
Exhaust:116 inches (294 cm)

Dimensions

Length:254.3 inches (645 cm)
Wheelbase:104 inches (264 cm)
Rear tread:80 inches (203 cm)
Front tread:80 inches (203 cm)
Ground clearance:17.2 inches (43 cm)
Operating weight:28100 lbs (12746 kg)

Electrical

Batteries:2
Battery volts:12
Charging system:alternator

Hydraulics

Type:open center
Pressure:2250 psi (155.1 bar)
Pump flow:62.5 gpm (236.6 lpm)
Steering flow:26.5 gpm (100.3 lpm)
Steering press.:2350 psi (162.0 bar)

Mechanical

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

Production

Type:Wheel Loader
Manufacturer:John Deere
Years produced:1974 - 1980

Attachments

Type:front-end loader
Dump angle:45°
Bucket width:104.75 inches (266 cm)
Reach (dumped):34.3 inches (87 cm)
Height (at pin):142 inches (360 cm)
Clearance (dumped):110.9 inches (281 cm)
Loader breakout force:24420 lbs (11076 kg)
Rollback (ground line):42°

Transmission

Type:power shift
Gears:4 forward and 2 reverse

Related Models

John Deere 644C

Model:644C

John Deere 544B

Model:544B

John Deere 644A

Model:644A