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MARCH-APRIL 2014
The hydraulic systems on both has been
designed with the major components close
together to allow for shorter connection hoses
and tubes to reduce frictional losses and
pressure reductions. This results in reduced
loading on the system for added fuel savings.
They feature a new Adaptive Control System
C
aterpillar has introduced two new
tracked excavators to the European
market in the form of the 75 tonne
374F and the 92 tonne 390F that replace their
D series predecessors. The new machines are
powered by Cat’s Stage IV compliant 352 kW
(472 hp) C15 and 391 kW (525 hp) C18 diesels
respectively that, according to the company,
deliver a 10% reduction in fuel consumption
compared to the previous models. Both feature
two power modes – standard or economy – to
allow the operator to select engine running
speed to suit the application, leading to further
fuel savings.
In addition, an on-demand-power system
adjusts engine speed to match the machines
operating load and an engine-idle-shutdown
system stops the engine after it idles for
a pre-set period. These features extend
service intervals in addition to reducing fuel
consumption.
The new machines have been developed
with distinct design criteria in mind.
These include low fuel consumption for
minimal operating costs, optimum operator
comfort, easy serviceability and class leading
productivity. The 374F has a maximum dig
depth of 9.5 m (32 ft) while the 390F can dig
to 11.8 m (39 ft) and they offer a forward
reach of 14.2 m (46.6 ft) and 17.2 m (56.5 ft)
respectively.
EQUIPMENT
Two new tracked Cats
Getting a grip
material fall, a shock alteration of the polarity
accelerates demagnetisation, resulting in fast
material drop and a magnet plate free from
even the smallest pieces.
An electronic generator is made from
corrosion free alloy and has a digital control
device in a waterproof body. Digital generator
control technology gives a magnetisation and
demagnetisation process cycle that is up to 25%
shorter than conventional magnet controllers,
leading to lower fuel consumption. It also
protects the magnet against the risk of damage
resulting from short-circuiting, overheating
or excessively high or low revolutions of the
generator.
■
The 390F is the larger of two
new Cat Stage IV engine emission
compliant tracked excavators
Two new Hydro Magnets, aimed at the
recycling, scrap and demolition sectors, have
been launched by Atlas Copco to complement
its range of hydraulic attachments. Each model
is available in two versions as either a fixed (F)
or mobile (M) unit. Load capacities range from
280 kg (616 lb) up to a maximum of 7,500 kg
(16,500 lb)
Hydraulic power provides automatic flow
and pressure control through the use of a
state-of-the-art flow divider. According to
Atlas Copco, a high activating voltage rapidly
achieves the magnetic power to attract a
large volume of ferrous material and hold it
firmly in place. When it comes to letting the
Atlas Copco has introduced two new
attachments to aid in metal separation
in the form of its Hydro Magnets
valve that electronically manages flows and
restrictions to precisely match the hydraulic
response to the joystick movements. Again
saving fuel, this smooths hydraulic functions
and adds to overall hydraulic efficiency.
■
JCB has supplied UK contractor Coleman & Company
Ltd with four new models from its range of skid
steer loaders, one 155 and three 135 models,
following on from the latter’s experience with a
previously purchased 135. The first machine was
acquired to work in some of Coleman’s sites where
space is confined and weight restrictions arise on
suspended floors. The new machines will be put
to work on high profile demolition projects across
the UK including Didcot Power Station, St David’s
Shopping Centre in Swansea and Birmingham New
Street Railway Station.
