Liebherr PR 754 Litronic - Manual (Page 9)

9 PR 754 Litronic PR 764 Litronic
Reliability
Well-proven technologies and high quality are what keeps a machine ready for use.
Liebherr develops and builds its own components and assemblies specifically for
use on construction and civil engineering machinery, so that their strength can be
guaranteed however difficult the application.
Liebherr powertrain
Liebherr engines Liebherr diesel engines have been developed for the
toughest imaginable operating conditions. A rigid lad-
der-type frame reduces engine vibration and provides
the strength needed for maximum operating reliability
and long service life.
Wear-free driveline
concept
A tried and tested system: Liebherr’s hydrostatic travel
drive needs no torque converter, manual-shift gearbox,
differential steering or steering clutches. The system’s
hydraulic pumps and motors are standardized, effec-
tively wear-free in operation and exceptionally reliable.
Long-life final drives Of ample dimensions, Generation 4 final drives are
designed to withstand the most severe loads. Double
transmission seals with automatic leak detection en-
hance reliability even more.
Robust steel construction
Box-section main frame The main frame is of box-section design – a well-
proven principle for maximum torsional stiffness and
optimal absorption of forces. Cast steel is used for
components subject to high stress.
Rear-mounted ripper Liebherr rippers are built for heavy-duty tasks, and
have extra protection at all areas exposed to wear.
Secrets of long-term reliability
Modern cooling system Two hydrostatically driven fans and a wide-meshed ra-
diator guarantee optimal cooling performance, even in
dusty environments.
Protected electrics High quality cable protection prevents mechanical
damage to the cable harness.
Modern cooling system
• Two electronically controlled fans draw in the volume
of air actually needed to keep the hydraulic fluid and
engine oil temperatures stable as loads vary. All com-
ponents operate in their most favorable temperature
ranges, thus avoiding unnecessary strain and pro-
longing their trouble-free operating life.
• Cooling air is drawn in from clean zones around
the machine, to keep dust contamination to a
minimum.
• Optional: a reversible fan for automatic radiator
cleaning when operating in extremely dirty or
dusty conditions.
Component endurance tests
• Even at the design stage, components
are subjected to FE analysis in order to
determine their dimensions in relation to
the loads they will encounter.
• All components undergo long-term labo-
ratory and field testing, and only those
that comply with Liebherr’s high quality
standards are approved for production.
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