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John Deere 644A

Series: John Deere Wheel Loader

Source: https://www.lectura-specs.com/en/model/construction-machiner

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The 644A from John Deere is part of the John Deere Wheel Loader series. The engine delivers 143 hp (97.7 kW), with a displacement of 6,620.4 cm³. Torque is 467.8 Nm. Rated speed is 2,400 rpm. The unladen weight is 1,143.1 kg. The wheelbase measures 2,642.6 mm. Ground clearance is 438.9 mm. The tank holds 189.3 litres. The gearbox has 4 forward gears. There are also 2 reverse gears. Maximum torque is reached at 1,600 rpm. The pump delivers 227.1 l/min. The hydraulic tank holds 66.2 litres. The cooling system holds 34.1 litres. The electrical system runs on 12 V. Tyre size: 16-24 / 20,5- 25. The John Deere Wheel Loader series covers 120 models. Rated output within it ranges from 55.8 to 286.9 hp; the 644A sits in the lower part of that range with 143 hp. Its immediate neighbours are the 544H below it with 139.9 hp and the 624EH above it with 158.2 hp. 2153 John Deere models across 96 series are on record. The model is listed under Wheel loaders. 20 verified figures from 1 source are on file.

Technical data

Engine

Power143 hp (97.7 kW)correct
Rated speed2,400 rpmcorrect
Torque467.8correct
Speed at max. torque1,600 rpmcorrect
Displacement6,620.4 cm³correct
Aspirationturbochargedcorrect
Coolant capacity34.1 lcorrect

Dimensions and weights

Wheelbase2,642.6correct
Ground clearance438.9correct
Unladen weight1,143.1 kgcorrect

Drivetrain and chassis

Gearbox typepowershift transmission Transmissioncorrect
Forward gears4correct
Reverse gears2correct
Tyre size16-24 / 20.5- 25correct
System voltage12 Vcorrect

Working data

Pump flow227.1 l/mincorrect
Hydraulic oil capacity66.2 lcorrect
Fuel tank capacity189.3 lcorrect

Other data

Height3,099.8correct

Where this model stands

Power-to-weight ratio: 85.5 kW/t (98 kW / 1.1 t)

Stronger than 50% of the wheel loaders in the register — out of 1,253 models with a stated power figure.

Calculated from the documented figures above — not a rating.

Frequently asked questions

How much power does the John Deere 644A have?

The John Deere 644A delivers 143 hp.

How much does the John Deere 644A weigh?

The unladen weight is 1,143 kg.

What engine does the John Deere 644A have?

6,620 cm³ displacement.

What to check before buying

  • Check the hour meter against the service records — a replaced instrument is the most common gap.
  • Compare the data plate and chassis number with the papers.
  • Check the weights in the papers against the figures here — attachments change them.
  • Load the hydraulics and watch for sag.
  • Ask about parts availability for this build year — the running costs hang on it.

A general list for this type of machine — no substitute for an inspection or an appraiser.

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This page carries 20 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.

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Other models in this series

204L

210LE

244E

244H

244J

244K-II

304H Waste Handler

304J

304L

324H

324J

324K

Sources: [1]

Wheel loader in 3D section

Turn the model, look inside and click an assembly — each one is explained.

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