Can You Dig It?
by Kerry Clines,
CAN YOU DIG IT?
This selection of 40-ton and larger excavators will have you digging up aggregates in record time.
TACKLES HEAVY APPLICATIONS
BOOM/SWING PRIORITY MODES
Kobelco’s new SK485 high-performance excavator is the largest of the company’s
Mark 9 excavator series. The company says the new model delivers up to a 15-percent
improvement in fuel efficiency. Features include upgraded intelligent hydraulics; a new
Economy power mode for greater fuel efficiency; a Tier 4 Interim Hino engine equipped
with cooled exhaust gas recirculation (CEGR) emission technology;
a new ROPS/FOPS cab with a
larger, more comfortable work
environment; and a low engine
cover and standard rear-view
camera for improved visibility.
Additional features include swing
flashers and step extensions. A
full selection of buckets, couplers,
and thumbs are available.
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DESIGNED FOR HEAVY-DUTY
Doosan says its largest crawler excavator,
the DX700LC, is designed for heavyduty mining and quarrying. The excavator
features an operating weight of 156,748
pounds with standard boom and arm,
35.4-inch double grouser shoes, and
a 4.32-cubic-yard bucket. It provides a
bucket breakout force of 78,485 pounds
with standard bucket. Maximum digging
reach is 41 feet, 8 inches at ground level;
maximum digging depth is 25 feet, 5
inches. Additional features include a new
power mode control system, an electronic
power optimizing system (EPOS), and a
six-cylinder common-rail diesel engine.
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AGGREGATES MANAGER April 2012
The Hitachi EX1200-6 hydraulic excavator comes with a front-shovel bucket range
of 7.7 to 8.5 cubic yards. The machine features an auto-level crowd mechanism for
one-lever crowding of the bucket into the material at a constant level, which is said
to keep a cleaner floor and increase bucket fill. Boom Priority mode increases boomraise speed to reduce cycle time
when the swing angle is small in
a cycle of digging, swinging, and
dumping. Swing Priority mode
increases swing speed when
the swing angle is large. The
unit is also available in backhoe
configuration with standard and
bulk excavation booms.
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REFINED DESIGN, ADDED SAFETY
Cat says its 198,000-pound 390D L hydraulic excavator incorporates a refined design
that provides greater hydraulic power, stronger structural components, and added
safety and convenience features, plus improved serviceability when compared to its
385C predecessor. This is said to create a more productive, more durable, more efficient machine that is comfortable to operate. An increase in hydraulic operating pressure, combined with larger-diameter hydraulic cylinders, results in a 7-percent boost in
digging-arm and bucket breakout forces.