The HM300 has a 28 metric ton (30.9 US ton) payload and is powered by a 242 kW (325 hp) engine.A Komatsu SAA6D125E-7 engine, which is Tier 4 final emissions compliant, is used. Selective catalytic reduction (SCR) is used to reduce NOx emissions, along with a diesel exhaust filter. The engine management system controls the air-flow rate, fuel injection, combustion parameters and after treatment functions to obtain optimal performance, reduce emissions and provide diagnostic capabilities. A variable geometry turbocharger and an Exhaust Gas Recirculation (EGR) valve is used for accurate temperature and air management control.
The HM300 features the Komatsu Traction Control System (K-TCS), providing optimal traction for operating in soft ground. Slippage is detected by speed sensors on four wheels, and automatic application of the inter-axle diff lock occurs. If the slippage continues, then four independent brakes can be applied to slipping wheels to regain traction. The six-speed, fully automatic transmission uses an electronic system to eliminate shift shock and torque cut-off. It automatically selects the ideal gear based on vehicle speed, engine rpm and the shift position chosen. This allows good acceleration, smooth down-shifting and synchronised engine speed when climbing slopes. It also has a large automatic retarder for optimum safe downhill travel speed when fully loaded, and prevents acceleration generated by the grade of the slope.
The ADT has a gross vehicle weight of 53,470 kg (117,881 lb). It has a low loading height of 2.82 m (9’ 2”), which is well matched to 30 to 60 ton excavators. It has a two single-staged body lift cylinders that provide a 70 degree dump angle. Source: www.komatsuamerica.com