PRESS RELEASE: Applications for these trucks include hard rock mining as well as civil construction and quarrying. Both machines are powered by low-emission Tier 4 Final engines and feature Komatsu's advanced truck transmission system.

The 28t HM300-5 is powered by Komatsu's SAA6D125E-7 engine rated at 242kW net, while the 40t HM400-5 is powered by the SAA6D140E-7 rated at 348kW net.

Both engines are US EPA Tier 4 Final emissions certified, cutting both nitrous oxide (NOx) and particulate matter (PM) emissions by 90% compared with their Tier 3 equivalents, while delivering up to 14% lower fuel consumption compared with previous models.

These engines incorporate an advanced electronic control system that performs high-speed processing of all signals from sensors installed in the vehicle, providing total control of equipment in all conditions of use.

Engine condition information is displayed via an on-board network to the monitor inside the cab, providing all necessary operating data to the operator.

Additionally, this data can be accessed and managed via the KOMTRAX telematics remote monitoring system (supplied as standard on all Komatsu construction and utility machines), ensuring owners and fleet managers stay well on top of all maintenance requirements.

According to Richard Feehely, Komatsu Australia's national business manager, quarries, Komatsu's new Tier 4 engines monitor and transmit far more detailed data about engine conditions and operation, giving unmatched visibility into the health of equipment - and any potential issues.

He added: "And through our in-house development and production of engines, electronics, and hydraulic components all designed to work with each other, Komatsu has achieved major advances in technology, providing high levels of performance and efficiency across all applications. Because of this integrated design approach, we have been able to achieve further reductions in fuel consumption with these new trucks.

"These include the use of variable displacement piston pumps that use engine power only as needed to eliminate unnecessary PTO inefficiencies, along with design improvements to the drive axles and transmission systems that reduce parasitic driveline losses."

Both new trucks feature Komatsu's advanced truck transmission system, including its electronically controlled K-ATOMICS countershaft transmission which is also used on large mining trucks, and the Komatsu Traction Control System (KTCS).

Feehely explained: "Both these features are unique to Komatsu articulated dump trucks and, combined with our hydraulically controlled wet multiple-disc brakes and retarder system, provide unrivalled traction, braking power and safety in all types of operation."

K-ATOMICS incorporates an electronic clutch modulation system that ensures proper clutch pressure when the clutch is engaged.

Feehely said: "This total control system controls both the engine and the transmission by monitoring the vehicle conditions, ensuring smooth shifts with minimal shock and thus maximises powertrain life. KTCS, which we have derived from our extensive experience in traction control systems in dozers and rigid dump trucks, was developed by Komatsu to ensure maximum machine performance in soft and slippery ground conditions.

"This system, which is automatically activated and deactivated, monitors wheel speeds on the front and middle axles, and if it detects wheel slip, will automatically engage the inter-axle lock to improve machine performance. If the machine continues to detect wheel slip, it will brake the wheel that slip was detected on, continually monitoring wheel speeds and engaging the brakes as necessary."

Both trucks also incorporate Komatsu's exclusive hydraulic braking and retarder system, which ensures complete control even when doing downhill fully loaded.

Feehely noted: "Large-capacity, continuously cooled, wet-multiple disc brakes, which have been proven on other Komatsu rigid dump trucks, also function as a highly responsive retarder, giving the operator full control when travelling downhill."

Retarder absorbing capacity (continuous descent) is 392kW on the HM300-5 and 510kW on the HM500-5.

They also both come as standard with a payload meter (PLM), which displays payload tonnage as the truck is loaded. This information is visible to the operator, and is also transmitted to owners and fleet management via KOMTRAX.

Both trucks feature large ergonomically designed ROPS/FOPS cabs with air suspension seats and hydro-pneumatic front axle suspension, while the centrally located operator seat and short-bonnet design ensures excellent visibility of the working area. A rear-view camera and in-cab monitor are also provided as standard.

Maintenance requirements have been made easier on the two trucks through features such as ground-level fuel filter access, power-tiltable cab, reversible engine cooling fan, battery disconnect switch and an electric fuel priming pump.

Feehely said: "Since we introduced our HM400-3M0 in Australia in 2014, it has proven itself as a highly productive, efficient and safe articulated hauler across a wide range of applications. Now with our launch of these latest low-emission versions of the HM300-5 and HM400-5 trucks, customers can take advantage of the benefits of the latest Komatsu technology for their haulage operations."