Komatsu GD521A-1 Motor Grader Specs

Category: Motor Graders ➔
Manufacturer: Komatsu ➔
Model: GD521A-1 ➔

The Komatsu GD521A-1 Motor Grader is a powerhouse on the worksite, boasting impressive dimensions and top-of-the-line specifications. With a robust engine model and maximum power of 135.5 horsepower, this motor grader is equipped to handle a variety of grading tasks with ease. Its ergonomic design includes a comfortable Isomount cab and precise steering system, making it a reliable and efficient choice for any construction project.

Dimensions

Komatsu GD521A-1 Motor Grader Dimensions specifications
Blade Base	8.34 ft (2.54 m)
Height To Top Of Isomount Cab	11.44 ft (3.49 m)
Overall Length	26.78 ft (8.16 m)
Rear Ground Clearance	1.19 ft (0.36 m)
Tandem Axle Wheelbase	5.04 ft (1.54 m)
Wheelbase	18.97 ft (5.78 m)
Width Over Tires	7.86 ft (2.40 m)

Engine

Komatsu GD521A-1 Motor Grader Engine specifications
Displacement	396.10 cu in (6,490.93 cu cm)
Engine Make	2238
Engine Model	S6D105
Max Power	135.50 hp (101.04 kw)
Net Power Gear 5-6	135.50 hp (101.04 kw)
Number Of Cylinders	6
Power Measured @	2500 rpm

Front Axle

Komatsu GD521A-1 Motor Grader Front Axle specifications
Ground Clearance	1.20 ft (0.37 m)

Moldboard

Komatsu GD521A-1 Motor Grader Moldboard specifications
Moldboard Height	25.40 in (64.52 cm)
Moldboard Width	12.20 ft (3.72 m)

Operational

Komatsu GD521A-1 Motor Grader Operational specifications
Fuel Capacity	60.00 gal (227.10 l)
Std Operation Weight - Total	23,810.00 lbs (10,800.05 kg)
Tire Size	13.00-24-8PR

Steering

Komatsu GD521A-1 Motor Grader Steering specifications
Articulation Angle	27 degrees
Turning Radius	21.70 ft (6.61 m)

Transmission

Komatsu GD521A-1 Motor Grader Transmission specifications
Max Speed - Forward	27.80 mph (44.74 kph)
Max Speed - Reverse	33.90 mph (54.56 kph)
Number Of Gears - Forward	6

Our Main Office

Construction Equipment Guide
470 Maryland Drive
Fort Washington, PA 19034
800-523-2200

About Us

Construction Equipment Guide covers the nation with its four regional newspapers, offering construction and industry news and information along with new and used construction equipment for sale from dealers in your area. Now we extend those services and information to the internet. Making it as easy as possible to find the news and equipment that you need and want.

Contents Copyrighted 2026, by Construction Equipment Guide, which is a Registered Trademark, registered in the U.S. Patent Office. Registration number 0957323. All rights reserved, nothing may be reprinted or reproduced (including framing) in whole or part without written permission from the publisher. All editorial material, photographs, drawings, letters, and other material will be treated as unconditionally assigned for publication and copyright purposes and are subject to Construction Equipment Guide’s unrestricted right to edit and comment editorially. Contributor articles do not necessarily reflect the policy or opinions of this publication.

Read our privacy policy here.
Mastodon