- Overall Length: 26.78 ft / 8160 mm
- Width Over Tires: 7.86 ft / 2395 mm
- Wheelbase: 18.97 ft / 5780 mm
- Rear Ground Clearance: 1.19 ft / 360 mm
Published dimensions and weight
Komatsu GD521A-1
The Komatsu GD521A-1 is a motor grader built around the S6D105 engine (135.5 hp).
01Published dimensions and weight
Dimensions reference
Measurement reference — not to scale

01Dimensions referenceLength × width × height
02Std Operation Weight - Total23810 lb10800 kg
03Selected published values25
Motor graders are commonly used to shape, level and maintain roads, pads and drainage surfaces. Published rows for Komatsu GD521A-1 include published moldboard width of 12.2 ft / 3710 mm, published maximum power of 135.5 hp / 101 kw, published operating weight of 23810 lb / 10800 kg. These values describe the published configuration; verify the specific machine's configuration, attachments and records.
- Compare the published “Overall Length” field (26.78 ft / 8160 mm) with the specific machine's configuration and records; options and condition can differ.
- Compare the published “Width Over Tires” field (7.86 ft / 2395 mm) with the specific machine's configuration and records; options and condition can differ.
- Compare the published “Wheelbase” field (18.97 ft / 5780 mm) with the specific machine's configuration and records; options and condition can differ.
02Specifications
Published values, clearly grouped.
Published specifications and measurements are organized by section for quick reference.
Dimensions
Overall Length26.78 ft8160 mm
Width Over Tires7.86 ft2395 mm
Wheelbase18.97 ft5780 mm
Rear Ground Clearance1.19 ft360 mm
Tandem Axle Wheelbase5.04 ft1535 mm
Blade Base8.34 ft2540 mm
Height To Top Of Isomount Cab11.44 ft3485 mm
Engine
Number Of Cylinders66
Engine Make22382238
Engine ModelS6D105S6D105
Power Measured @2500 rpm2500 rpm
Net Power Gear 5-6135.5 hp101 kw
Max Power135.5 hp101 kw
Displacement396.1 cu in6.5 L
Operational
Std Operation Weight - Total23810 lb10800 kg
Fuel Capacity60 gal227 L
Tire Size13.00-24-8PR13.00-24-8PR
Steering
Articulation Angle27 degrees27 degrees
Turning Radius21.7 ft6.6 m
Transmission
Number Of Gears - Forward66
Max Speed - Forward27.8 mph44.6 km/h
Max Speed - Reverse33.9 mph54.4 km/h
Front Axle
Ground Clearance1.2 ft360 mm
Moldboard
Moldboard Width12.2 ft3710 mm
Moldboard Height25.4 in645 mm
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Manufacturer-published specifications.