Downloadable brochures and spec sheets for current and non-current models are here.
Interview with Designers of the Ultra-Large Excavators
The cutting-edge technologies for downtime and maintenance cost reduction, developed on the world-class EX8000 Ultra-Large Excavator, are adopted to the New EX-6 Series Giant Models.
ZAXIS870H
World-Class Productivity
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 850 / 850LC / 870H / 870LCH.
Production: Approx. 7 % Increase
(vs. Conventional Model)
Advanced Hydraulic Technologies
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, pressurised oil from pump is delivered to boom cylinder rod side to lower the boom. The new system also allows 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 8 %) 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.
Development Concept of New Engine
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 3 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
