The Komatsu Tier 4 Interim engine uses an advanced electronic control system to manage air flow rate, fuel injection, combustion parameters, and aftertreatment functions to optimize performance, reduce emissions, and provide advanced diagnostic capability.
The HM300-3 features a maximum gross vehicle weight (GVW) of 115,147 lb (52,230 kg). It can haul up to a 31 ton (28.1 metric ton) payload at its maximum ground speed of 36.4 mph (58.6 kph). The HM300-3 features the new Komatsu Traction Control System (K-TCS). The K-TCS system automatically provides optimum traction when operating in soft ground conditions. As ground conditions worsen and tire slippage is detected by speed sensors located on four wheels, automatic application of the inter-axle differential lock occurs. If tire slippage continues to be detected then four independent brakes can be applied to slipping wheels to regain traction.
Through body design optimization, the HM300-3 features increased body capacity and payload. The low 9’2” (2820mm) loading height easily matches with 30-ton to 60-ton hydraulic excavators or 5 yd³ to 7.5 yd³ wheel loaders. In addition, the two single-staged body lift cylinders provide a 70-degee dump angle. The new cab design provides a comfortable and quiet work environment so operators can maximize their productivity. The ROPS/FOPS Level 2 certified cab features a new rounded front dash panel with easy to reach switches. The dashboard has been redesigned and relocation of the high back, heated air ride seat with point seat belt improves operator visibility.