2018 International Forest Industries IFI April May 2018 Digital | Page 49

The HEM 821 DQ
Cobra hybrid
needed at all, because the removal
vehicles must also be able to
follow the terrain,” says Hempen-
Hermeier.
There has also been progress
made in the engine technology
used. So far, Jenz has used the
Mercedes Benz engine OM 473
with 625 hp in its chipping unit
HEM 821 DQ. Now the machine
company also offers the same
chipper with the Caterpiller CAT C18
and 776 hp.
“From our customers we
generally receive positive feedback
on both engines,” says Hempen-
Hermeier.”
“The OM 473 is praised
[because it] works very well
and quietly. The CAT C18, on the
other hand, is loud and powerful,
because emissions also play a role.
Higher diesel consumption in CAT
engines has not been confirmed to
us by our customers.”
In principle, however, the
choice of the on-site service of
the respective workshops should
always be taken into account
and this can, of course, vary in its
availability and quality, adds the
managing director.
“No matter which engine is
installed, the HEM 821 DQ is
designed with a system power
of over 1,000 hp for large orders
and high-performance chipping
in extreme continuous operation,
for this purpose both engines are
suitable.
“In addition, we have the
advantage of having our total
weight at 32 t and therefore no
special permits are required. This
is not only an advantage when
buying, but also increases the
resale value.”
In order for the complex special
machines to be operated in as user-
friendly a way as possible, Jenz
not only relies on innovative cabin
concepts and high-performance
engine technology in its HGV-
chippers, but also on its new
machine control system.
“At the Agritechnica in
November last year, we presented
our new machine controller ‘easy2’
for the first time as a successor to
the previous ‘easygreen’ control
system,” explains Hempen-
Hermeier.
The easy2 not only scores
with improvements in the field of
hardware, such as a large-scale
touch display or new multi-function
joysticks, but also includes many
new features on the software side.
In different display menus the
operator can arrange settings
The HEM 821 benefits from the
hybrid engine system
according to their wishes. In
addition, limit values can be
defined, display instruments set
and various operating data for
business analysis or in case of
malfunctions determined.
“The machine controller is the
interface between human and
machine and therefore enormously
important so that the machine
can also be used optimally and
economically. Especially in the area
of large machines, as with HEM
821 DQ ,” Hempen-Hermeier, said,
emphasizing the importance of the
new developments.
The HEM 821 DQ is designed with a system power of over 1,000 hp for large orders and high-performance chipping
in extreme continuous
International Forest Industries | APRIL / MAY 2018 47