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Komatsu GD521A-1

Series: Komatsu Motor Grader

The photo shows the GD675-5 from the same series. Source: https://www.komatsu.eu/en/motor-graders/gd675-7 komatsu.eu

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The Komatsu Motor Grader series from Komatsu includes the GD521A-1. The engine delivers 137.4 hp, has 6 cylinders, with a displacement of 6,490.9 cm³. Rated speed is 2,500 rpm. The wheelbase measures 5,782.1 mm. Ground clearance is 365.8 mm. The tank holds 227.1 litres. The engine fitted is the S6D105. Tyre size: 13,00-24-8PR. The Komatsu Motor Grader series covers 36 models. Rated output within it ranges from 76 to 283.9 hp; the GD521A-1 sits in the lower part of that range with 137.4 hp. Its immediate neighbours are the GD505R-2 below it with 131.8 hp and the GD530A-2C above it with 145.5 hp. 1159 Komatsu models across 39 series are on record. The model is listed under Motor graders. 10 verified figures from 1 source are on file.

Technical data

Engine

Engine modelS6D105correct
Power137.4 hpcorrect
Rated speed2,500 rpmcorrect
Cylinders6correct
Displacement6,490.9 cm³correct

Dimensions and weights

Length8,162.5correct
Wheelbase5,782.1correct
Ground clearance365.8correct

Drivetrain and chassis

Tyre size13.00-24-8PRcorrect

Working data

Fuel tank capacity227.1 lcorrect

Frequently asked questions

How much power does the Komatsu GD521A-1 have?

The Komatsu GD521A-1 delivers 137 hp.

What engine does the Komatsu GD521A-1 have?

6 cylinders, 6,491 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.
  • 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 10 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

GD200A-1

GD300A-1

GD305A-3

GD31RC-3A

GD405A-1

GD500R-2

GD505A-2

GD505R-2

GD510R-1

GD511A-1

GD530A-2C

GD530AW-2C

Sources: [1]

Grader in 3D section

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

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