Search/Industrial Tractor/John Deere/644A

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Industrial Tractor · 1971Unverified

John Deere 644A

Name: John Deere 644A
Brand: John Deere

John Deere 644A — Wheel Loader · 141 hp. Reference specifications; pending source verification.

The John Deere 644A is an industrial tractor with an output of approximately 141 horsepower, placing it at the high-power end of its class. Production of this model occurred from 1971 to 1973. Key features include a 6-cylinder turbocharged diesel liquid-cooled engine paired with four-wheel drive and a powershift transmission. The 644A has an operating weight of 12007 kg and is suitable for operations covering 200–800 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power

141 hp

Weight

12007 kg

Catalogue coverage

Variants represented

Richest spec table

56 rows

Recorded power

141 hp

Recorded weight

12007 kg

Transmissions

4-speed power shift

Production years

1971-1973

Verified variants

1 linked source document displayed

Hover a source tag to verify

Overview

ManufacturerJohn DeereReference

Wheel LoaderReference

Four-wheel driveReference

Final drivesinboard planetaryReference

Articulated power steeringReference

Hydraulic wet disc brakesReference

Cab standard with heat.Reference

Engine

John Deere 6.6L 6-cyl dieselReference

Fuel tank189.2 LReference

Engine (gross)105.1 kWReference

Engine (net)97.7 kWReference

John DeereReference

turbocharged dieselReference

6-cylinderReference

liquid-cooledReference

Displacement6.6 LReference

Bore/Stroke108 x 121 mmReference

Power (net)97.7 kWReference

Power (gross)105.1 kWReference

Compression16.5:1Reference

Rated RPM2400Reference

Torque467.8 NmReference

Torque RPM1600Reference

StarterelectricReference

Starter volts12Reference

Oil capacity16.1 LReference

Coolant capacity34.1 LReference

Transmission

4-speed power shiftReference

Typepower shiftReference

Gears4 forward and 2 reverseReference

Power shift transmission with torque converter. Automatic shift from 1-2 and 3-4.Reference

PTO & Hydraulics

Typeopen centerReference

Pressure155.1 barReference

Pump flow227.1 lpmReference

Steering flow102.2 lpmReference

Steering press.137.9 barReference

Dimensions

Wheelbase264 cmReference

Weight12007 kgReference

Front tire20.5-25Reference

Rear tire20.5-25Reference

Industrial front20.5-25Reference

Industrial rear20.5-25Reference

Industrial front17.5-25Reference

Industrial rear17.5-25Reference

Length629 cmReference

Operating weight12007 kgReference

Ground clearance40 cmReference

Front tread203 cmReference

Rear tread203 cmReference

John Deere 644A attachments

front-end loaderReference

Electrical

Charging systemalternatorReference

Batteries2Reference

Battery volts12Reference

John Deere 644A Height

ROPS309 cmReference

Cab322 cmReference

Exhaust297 cmReference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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