The new models are powered by low emission Komatsu Tier 4 Final engines, delivering reductions in NOx and PM emissions by up to 90% compared with the Tier 3 engines in the previous Dash 8 range.
They incorporate a common rail fuel injection system, Komatsu diesel particulate filter, Komatsu variable geometry turbocharger, Komatsu closed crankcase ventilation filter, cooled exhaust gas recirculation, a selective catalytic reduction system and advanced fuel injection timing.
"As well as significantly lower emissions, the Dash 11 excavators are also incredibly fuel efficient, offering up to 11% fuel savings on some models," said Amber Rickard, Komatsu's national business manager - construction.
"An important factor in this is that Komatsu designs and manufactures all major components, including engines, pumps, valves, motors and cylinders.
"The ability to design systems that work together, such as the engine and hydraulics, allows us to optimise machine performance so we maximise production while minimising fuel consumption," she said.
The Dash 11 excavators are fitted with a number of unique features that contribute to reduced fuel consumption and allow the engine to operate at the most efficient speed.
- Low speed matching, which provides higher flow output at a lower engine RPM through the use of larger displacement hydraulic pumps. This feature also provides better pick up and response to hydraulic flow demand and provides fuel savings in all duty cycles.
- Variable speed matching, an engine-pump matching control that matches engine speed to hydraulic flow requirements. It keeps engine speed high when large pump delivery is required and reduces engine speed in light duty operations to save fuel.
- A reduction in auto deceleration speed to low idle speed.
Additional improvements that contribute to fuel efficiency include an economy working mode for attachments, an "ECO-guidance" function which provides data and recommendations to the operator for fuel saving operations, and auto idle shutdown to reduce excessive idle time.
Safety and operator comfort have also been upgraded on the Dash 11 excavators.
"All our Dash 11 excavators have an upgraded, fully compliant ROPS cab and include a new high back air suspension operator seat with lumbar support," Rickard said.
"The new cabs also incorporate console mounted arm rests with a tool-less height adjustment so that operators can easily change the arm rest position in relation to both the seat and the joysticks for better ergonomics."
Safety is further improved with the lock lever auto lock function that prevents unintentional movement.
"If the operator has accidentally activated a control during start-up, the machine recognises this and automatically applies the hydraulic lock so that no uncontrolled movement occurs," Rickard said.