Komatsu D21A-7 Crawler Dozer Specs

Category: Crawler Dozers ➔
Manufacturer: Komatsu ➔
Model: D21A-7 ➔

The Komatsu D21A-7 crawler dozer is a reliable and efficient machine designed for a variety of earthmoving tasks. With a powerful 40 hp engine and a comfortable cab, this dozer offers excellent performance and operator comfort. Its compact dimensions and sturdy undercarriage make it suitable for maneuvering in tight spaces and tough terrains. Whether you need to clear land, grade roads, or push material, the D21A-7 delivers the power and precision you need to get the job done effectively.

Dimensions

Komatsu D21A-7 Crawler Dozer Dimensions specifications
Ground Clearance	1.00 ft (0.30 m)
Height - Top of Cab	8.20 ft (2.50 m)
Length of Track on Ground	5.60 ft (1.71 m)
Length w/ Blade	11.20 ft (3.41 m)
Length w/o Blade	8.40 ft (2.56 m)
Width Over Tracks	5.30 ft (1.62 m)

Engine

Komatsu D21A-7 Crawler Dozer Engine specifications
Displacement	164.20 cu in (2,690.76 cu cm)
Engine Model	4D95S
Gross Power	40.00 hp (29.83 kw)
Number of Cylinders	4
Power Measured @	2450 rpm

Operating Specifications

Komatsu D21A-7 Crawler Dozer Operating Specifications specifications
Operating Weight	7,936.70 lbs (3,600.03 kg)

Standard Blade

Komatsu D21A-7 Crawler Dozer Standard Blade specifications
Height	23.30 in (59.18 cm)
Width	7.20 ft (2.19 m)

Transmission

Komatsu D21A-7 Crawler Dozer Transmission specifications
Number of Forward Gears	2
Number of Reverse Gears	2
Transmission Type	HS

Undercarriage

Komatsu D21A-7 Crawler Dozer Undercarriage specifications
Number of Track Rollers per Side	5
Standard Shoe Size	11.90 in (30.23 cm)
Track Gauge	4.30 ft (1.31 m)
Track Pitch	5.40 in (13.72 cm)

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