2017 International Forest Industries Magazines IFI Aug Sept 2017 v2 | Page 53

OPERATION FOCUS – JENZ
JENZ supplies first Chippertruck HEM 583 R
unit to Estonia based on a Volvo truck
The Volvo brand is
particularly popular
in Scandinavia and
the Baltic countries. A
request for a chipper
on a Volvo chassis is
therefore not really
a surprise. JENZ now
followed this customer
request and delivered
the first chipper truck
HEM 583 R to Estonia
T
he Volvo Chipper Truck
especially fulfils the specific
customer needs in the
sparsely-populated Scandinavian
and Baltic countries. Sometimes
the working sites are a long way
apart. The drivers are often on the
road with their chipper trucks for
a considerably longer period and
often have to overnight in them.
The comfort provided by
the driver’s cab is much more
important in these cases - after
all, it needs to be a mixture of
workplace and sleeping quarters.
On top of this the HGV should at
least be partially usable on uneven
roads, which isn’t necessarily the
case for most HGVs with long-
distance driver cabs.
Volvo scores points in both
cases, because the Volvo FH in
question is also available with a
medium-height chassis as a series
production. This is not the case
with other manufacturers.
The customer ordered the
FH 16 with 550 hp and a 4-axle
tridem chassis as a chipper base.
The JENZ engineers were now on
the line. Stefan Müller, Research
and Development Manager told
us about the project’s special
features: “With the Volvo chipper
truck, we have to take power off
at a different location along the
drivetrain in comparison with the
MAN chipper trucks we used as
standard up to now.”
The Volvo does not have a
front wheel drive and only drives
the first two rear axles. For this
reason a power divider was used
in order to route the power flow
either to the chipper or to the rear
axles. “All the drive components
are also designed for this purpose
as “heavy duty” components”
explained Stefan Müller.
The wheelbase is slightly longer
than the standard chipper truck
due to the drivetrain. However, Mr
Müller considers this an advantage
because both the first and last
axle are steered. “This means that
the HGV is still very manoeuvrable
despite its four axles.”
Adding the chipper to the 4-axle
tridem chassis also offered the
engineers a further advantage.
“With one axle at the front and 3
at the rear we still have sufficient
reserves in terms of weight and
length” explained Mr Müller. This
means that other chipping units,
for example the HEM 593 R or the
HEM 821 R, could also be built on
without requiring special approval.
The first customer decided to
take a chipping unit with a medium
power class, the HEM 583 R. The
objective was to build the machine
on as simply as possible. “That’s
why we decided to orientate
ourselves on our power takeoff
machines and we also applied the
pump distribution transmission we
use in our power takeoff machines.
That is something which has
established itself successfully over
many years of practice.” Apart from
this, the construction ensures that
all the hydraulic components in
the chipper are as far away from
the diesel motor heat source as
possible.
The alternative concept
definitely results in savings of
work time and hotel costs under
the corresponding deployment
conditions, and at the same time it
achieves maximum comfort for the
driver. “It is completely different
to the previous chipper trucks, and
it might result in overhauling the
question: crane cab or driver’s cab
with mowing window” said Stefan
Müller.
International Forest Industries | AUGUST / SEPTEMBER 2017 51