HITACHI CONSTRUCTION MACHINERY

Short rear-end swing makes efficient operations possible in various confined worksites.
New hydraulic system HIOS III and new OHC 4-valve diesel engine were developed for ZAXIS-3. These advanced technologies are at work to yield bigger output with higher fuel efficiency.

Applicable in Various Job Sites

• Short 1 990 mm rear-end swing radius promises efficient operations in confined spaces.

• Rear-end swing radius is shorter than of ZX130.

• 360 mm reduction in minimum front swing radius. (vs. conventional ZX225USR)

Stability Exceeds Standard Model

• Stability is increased by using the exclusive USR weighted counterweight.

• Stability: 7 % increase (vs. ZX210-3)

New E-mode
The new E mode, H/P mode and P mode can be selected to suit job needs. The new E mode can save fuel consumption by up to 13 % compared to the previous model’s P mode, while yielding similar production.

New E-mode
The new E mode, H/P mode and P mode can be selected to suit job needs. The new E mode can save fuel consumption by up to 13 % compared to the previous model’s P mode, while yielding similar production.

Increase in Swing Torque
Swing torque is increased significantly.

• Swing torque 13 % UP

ZAXIS-1 adapted HIOS II hydraulic system that is suitable for fine controllability
by the operators. Continuously HITACHI developed new advanced hydraulic technology HIOS III for ZAXIS-3. In addition to the fine controllability this new system increases the efficiency of hydraulic circuit and increases speed of actuators.

The Hydraulic Boosting System
In arm roll-in and boom raise operation, excess pressurized oil is delivered from boom cylinder rod side to arm cylinder bottom side to increase flow rate giving 20 % higher arm roll-in speed. Excess pressurized oil from boom cylinder rod side is delivered to
arm cylinder bottom side through a regenerative valve to increase flow rate for productive operation.

Enhanced Boom Recirculation System
In combined operation of boom lower and arm, pressurized oil from boom cylinder bottom side is delivered to boom cylinder rod side, assisted by boom weight, for boom lowering. At the same time, pressure oil from the pump is delivered to the arm cylinder for arm movement. This mechanism allows an increase of speed in combined operation of 15 %.

OHC 4-Valve Engine
The new OHC 4-valve diesel engine is developed and built to comply with the rigorous Emission Regulations enforced in 2006 in U.S. and EU. This new engine contributes to environmental preservation. At the same time it realizes high durability and low fuel
consumption by adapting the latest advanced engine technology.

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* (diesel plume) 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* (diesel plume).
_{*Particulate Matter
**Exhaust Gas Recirculation}

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