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The 30.9 ton capacity HM300-5 is powered by a Tier 4 final Komatsu engine. A Komatsu Traction Control System along with two working modes and a standard payload meter (PLM) provide the operator with the tools needed to complete the job efficiently and profitably even in the most severe underfoot conditions. A heated, centre located air suspension operator seat, a forward facing training seat, separate rear view monitor, and large LED multi-language monitor ensure the operator is working productively in comfort throughout a full shift.

Features & Benefits

New Tier 4 Final Engine

The Komatsu SAA6D125E-7 engine is EPA Tier 4 Final emissions certified and provides exceptional performance while reducing fuel consumption.

Komatsu Auto Idle Shutdown

Auto idle shutdown automatically shuts the engine down after idling for a set period of time to reduce unnecessary fuel consumption and exhaust emissions. The amount of time before the engine is shutdown can be easily programmed from 5 to 60 minutes.

Large Capacity Body

The heaped body's capacity is 17.1 m3 22.4 yd3. The low loading height of 2830 mm 9'3" enables easy loading. The body is built of high strength, wear-resistant steel with a Brinell hardness of 400 and the body shape provides excellent load stability. It

Countershaft Transmission

The Komatsu designed electronically controlled transmission called K-ATOMiCS has been a success in Komatsu’s dump trucks. The electronic clutch modulation system ensures proper clutch pressure when the clutch is engaged.

Komatsu Traction Control System (KTCS)

Komatsu leveraged its prior experience with the traction control systems in bulldozers and rigid dump trucks to develop this system for use in articulated dump trucks.

Payload Meter (PLM)

A payload meter is included as standard equipment on the new HM300-5. The payload tonnage is displayed on the Machine Monitor and is visible to the haul truck operator.

Brakes and Retarder

The large-capacity, continuously cooled, wet-multiple disc brakes function as a highly responsive retarder which gives the operator greater confidence at higher speeds when travelling downhill.

ECO Guidance

The monitor panel provides guidance to the operator to help promote energy saving operation. For example, if the operator stops the machine for a long period of time with the engine idling, the message “Avoid excessive engine idling” is displayed.

ECO Gauge

The ECO gauge indicates a momentary fuel consumption rate during operation. Operating the machine by keeping the gauge within the green zone leads to energy-saving operation.

Tiltable Cab with Power Tilt

The cab can be tilted rearward by 29 degrees to provide easy access to the engine and transmission for service. Electrically-operated cab tilt is standard.


Key Specifications
Empty weight 55,986 lbs (25,395 kg )
Payload 30.9 U.S. tons (28.0 metric tons)
Horsepower: SAE J1995 332 HP (248 kW)
Horsepower: ISO 9249 / SAE J1349 324 HP (242 kW)
Bore 4.92" (125 mm)
Heaped (2:1, SAE) 22.4 yd3 (17.1 m3 )

Company Info

8770 W Bryn Mawr Ave., Suite 100
Chicago, IL
US, 60631


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