HITACHI CONSTRUCTION MACHINERY

To yield high production yet maintain low fuel consumption, such was the objective of the development of a new engine and hydraulic system for the ZAXIS 470LCH.

Production:

• Approx. 7% Increase
  

Increased Digging Force
14% more bucket digging force and 8% more arm digging force*.
* At power boost mode / vs Conventional model

Enhanced Boom Recirculation System
In combined operation of boom lower and arm, arm speed can be increased
by approximately 15% over the conventional. Pressurized oil from boom cylinder
bottom side is delivered to boom cylinder rod side to lower the boom, assisted
by boom weight. Conventionally, pressurized oil from pump is delivered to boom cylinder rod side to lower the boom. The new system also allows for an efficient combined operation of swing and lowering the boom.

Boom Mode Selector
The amount the body can be lifted or pulled by the front of machine can be ON or OFF selected. This helps to provide for more comfortable operation and contributes to longer component service life.

Larger-Diameter Front Piping
Arm piping is increased in diameter to reduce hydraulic loss (theoretically 7%) for speedy front operation.

Combined Operation of Boom and Arm
In combined operation of swing + boom lower + arm roll-out, or in leveling (boom
lower + arm roll-out), arm roll-out speed can be increased greatly. Here?s why.
A variable throttle, provided in the arm circuit, adjusts the flow when needed to reduce hydraulic loss in combined operation with arm roll-out.

New Bucket Regenerative System
Swift bucket actions can be done in combined operation for excavation through the new bucket regenerative circuit. When the load to the bucket is light, pressurized oil from bucket cylinder rod side is delivered through a regenerative valve to bucket cylinder
bottom side for the effective use of hydraulic energy.

High Power Yet Low Fuel Consumption
10% Increase in output (vs. Conventional model)

• 397 kW ( 532 hp) / 1 800 min-1

The new clean engine, complying with the emission regulations Tier in US (EPA) and EU Stage III, can reduce fuel costs by electronic control.

Common Rail Type Fuel Injection System
Electronic control common rail type fuel injection system drives an integrated fuel pump at an ultrahigh pressure to distribute fuel to each injector per cylinder through a common rail. This enables optimum combustion to generate big horsepower, and reduce PM* and fuel consumption.

Cooled EGR** System
Exhaust gas is partially mixed with intake air to lower combustion temperature for reducing NOx and fuel consumption. What's more, the EGR cooler cools down exhaust gas to increase air concentration for complete combustion, reducing PM*.
_{*Particulate Matter
**Exhaust Gas Recirculation}

Feature Top