The ZW Series is equipped with a clean but powerful engine to comply with Tier 3 and Stage III A. An engine emission regulations effective in the U.S. EPA and European Union from 2006. Exhaust gas is partly re-combusted to reduce particulate matter (PM) output and lower nitrogen oxide (NOx) levels.
Common Rail Type Fuel Injection System
In this fuel injection system complying with the Emission Regulations, one fuel pump runs to generate high pressure for distributing fuel to each injector per cylinder through a common rail. By electronic control, fuel injection volume and timing can be precisely regulated for efficient combustion and higher horsepower. This also reduces PM* (diesel plume), fuel consumption and vibration.
*Particulate matter
Cooled Exhaust Gas Recirculation (EGR) System
The cooled EGR system lets part of exhaust gasses mix with intake air for recombustion to reduce oxygen concentration in the air in the combustion chamber. This design lowers combustion temperature in the cylinder, reducing fuel consumption and NOx while yielding more horsepower. This system also cools down exhaust gas to prevent incomplete combustion and PM* emission.
*Particulate matter
A Recyclable Machine
Approximately 95% of the ZW Series can be recycled. The resin parts are marked to facilitate recycling. The machine is completely lead-free. The radiator and oil cooler are made from aluminum and all wires are lead-less. In addition, bio-degradable hydraulic oil
is available for jobsites where special environmental care is required.
A Quieter Machine
A number of features make this machine quieter. First, isochronous control of the engine
speed means a restriction of engine speed during no-load and light-duty operation to
suppress sound. A fan with curved blades reduces air resistance and airflow noise.
Third, a time-tested muffler suppresses engine noise significantly and reduces
emissions. This advanced low noise design complies with the 2000 / 14 / EC, Stage II,
directive effective in the European Union from 2006.
Hitachi Silent (HS) Fan
The HS fan is capable of reducing air resistance and air flow sound. It is utilized at the radiator and oil cooler for quieter operation.
Low Noise Engine
Engine noise is effectively reduced by increasing engine mechanical strength with rigid cylinder block, and by utilizing the elaborate gear train on the flywheel side.
