022 21838 Dermot Casey Plant Hire, Mallow, Cork, Co. Cork
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7 Tonne Excavator Hitachi ZX 70

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Efficient hydraulic system and new intercooled turbocharger diesel engine were developed for ZAXIS-3.
These advanced technologies are at work to yield bigger output with higher fuel efficiency.

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Boosted Productivity

Efficient hydraulic system and new intercooled turbocharger diesel engine were developed for ZAXIS-3.
These advanced technologies are at work to yield bigger output with higher fuel efficiency.

More production, less fuel consumption

Increased Production

A combination of the hydraulic system (HIOS*II) and new intercooled turbocharger engine allows the efficient use of hydraulic pressure to increase speeds of actuators and boost production with higher fuel efficiency. The productivity is increased 5 % in comparison to previous model ZAXIS-1.
*Human & Intelligent Operation System

E-mode

The E mode and P mode can be selected to suit job needs. The E mode can save fuel consumption by up to 12 % compared to the previous model’s P mode, while yielding similar production.

Increase in Swing Torque, Traction Force and Travel Speed

Swing torque and traction force are increased significantly.
-Swing torque 11 % UP
-Traction force 4 % UP
-Travel speed 6 % UP
Sophisticated Travel Control; At climbing or steering, when the machine needs more traction force, the engine speed automatically increases which makes the machine faster.

Efficient hydraulic control

Hydraulic System

The Hydraulic System elicits more user satisfaction than other models due to its greater operator comfort and ease of operability. During arm roll-in operations, the hydraulics of 3 pumps are merged, allowing for quick leveling operations. Depending on the operations, usage of the 3 pumps are automatically switched, offering excellent operability. It supports stability and combined operability, such as speed balance and land clearing.

Speed Sensing Control

A speed sensing system is used for hydraulic horsepower control. The hydraulic pump delivery flow, which varies with changes in engine RPM according to the load, is controlled. This means efficient use of engine horsepower, and also contributes to a reduction in fuel consumption.

Development concept of new engine

Intercooled Turbocharger Engine

The new intercooled turbocharger engine is developed and built to comply with the rigorous Emission Regulations enforced in 2008 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.

ENGINE

Model Isuzu AU-4LE2X
Type 4-cycle water-cooled, direct injection
Aspiration Turbocharged, intercooled
No. of cylinders 4
Rated power EEC 80/1269 (without Fan) 40.5 kW (54.3 HP) at 2 000 min-1 (rpm)
Rated power SAE J1349 (without Fan) 40.5 kW (54.3 HP) at 2 000 min-1 (rpm)
Rated power ISO 9249, net 39.4 kW (52.8 HP) at 2 000 min-1 (rpm)
Rated power EEC 80/1269, net 39.4 kW (52.8 HP) at 2 000 min-1 (rpm)
Rated power SAE J1349, net 39.4 kW (52.8 HP) at 2 000 min-1 (rpm)
Maximum torque 215 Nm (21.9 kgf m) at 1 500 min-1 (rpm)
Piston displacement 2.179 L
Bore and stroke 85 mm x 96 mm
Batteries 2 x 12 V / 52 Ah

HYDRAULIC SYSTEM

Swing-independent 3-pump hydraulic system

OHS (Optimum Hydraulic System) assures fully independent and combined operations

Automatic 2-speed motor increases traction force and travel speed

Engin speed sensing system

Main pumps 3 variable displacement axial piston pumps
Main pumps Maximum oil flow 2 x 72.6 L/min
1 x 61.6 L/min
Pilot pump 1 gear pump
Pilot pump Maximum oil flow 22.0 L/min

Hydraulic Motors

Travel 2 variable displacement axial piston motors
Swing 1 axial piston motor

Relief Valve Settings

Implement circuit 26.0 MPa (265 kgf/cm2)
Swing circuit 23.0 MPa (235 kgf/cm2)
Travel circuit 31.4 MPa (320 kgf/cm2)
Pilot circuit 3.9 MPa (40 kgf/cm2)

Hydraulic Cylinders

High-strength piston rods and tubes. Cylinder cushion mechanisms provided in boom and arm cylinders to absorb shock at stroke ends.

Dimensions

Hydraulic Filters

Hydraulic circuits use high-quality hydraulic filters. A suction filter is incorporated in the suction line, and full-flow filters in the return line and swing/travel motor drain lines.

CONTROLS

Pilot controls. Hitachi’s original shockless valve.

Implement levers 2
Travel levers with pedals 2