Liebherr LR 634 Litronic - Manual (Page 5)

5
Economy with High Performance
Tunnel construction is one of the toughest environments
for excavator operation that exists. The operation of a
tunnel excavator becomes efficient when the machine,
despite the harsh conditions, can cut out the tunnel pro-
file required as rapidly as possible but in economical fash-
ion. This means that a tunnel excavator must produce a
high hydraulic capacity and, above all, be provided with
operational fittings which are tailored to the particular ap-
plication. The hydraulic system used with Liebherr tun-
nel excavators is optimized for milling. Liebherr tunnel
excavators meet the high demands imposed in tunnel
construction with both the basic machine and the attach-
ment precisely matched to this particular type of work,
and consistently designed to achieve real economical
performance. Reliability
Liebherr tunnel excavators are the result of decades of
practical experience in the development of truly reliable
special equipment for demanding situations. All the mate-
rials used have undergone intensive, long-term tests and
meet Liebherr
’s high quality standards even under the
hardest conditions. In addition to being extremely robust,
the attachment on Liebherr tunnel excavators is able to
rotate 2 x 45°. The mechanical quick coupling system is
provided with a reinforced locking unit and a wear protec-
tion element on the hook side. The sophisticated concept
and the proven quality make Liebherr tunnel excavators
the absolute standard for reliability.
Safety
The special cab is safeguarded with FOPS and FGPS as
standard. To prevent damage from falling rocks, all the
hoses in exposed locations on the equipment fittings are
additionally secured by protection plates. The bucket cyl-
inder is also attached in a lower position, and a guard
over both the lifting cylinders protects the hoses running
between them.
Comfort
Characteristic of the special cab on the Liebherr tunnel
excavator are the ergonomic design and high standard of
operating comfort and convenience. The windows on the
right and at the rear are fitted with polycarbonate panes,
resistant to scratches and impacts, and feature extremely
good visibility properties. As an option, the cab is also
available with polycarbonate window panes all around.
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