Liebherr PR 744 Litronic - Manual (Page 9)

9 PR 734 Litronic PR 744 Litronic
Reliability
Due to their high quality and excellent engineering, these machines offer maximum
availability. Components developed by Liebherr specifically for use in construc-
tion machinery guarantee operational reliability in even the toughest conditions.
Liebherr drive train
Durable engine Liebherr diesel engines were developed for the most
demanding conditions of use. Their low rated speed
ensures high operational reliability and a long life-
time.
Fewer components The proven hydrostatic travel drive means that
mechanical components such as a torque converter,
manual gearbox and differential steering or clutches
are not required. Standardized hydraulic pumps and
motors are non-wearing and dependable in operation.
Robust final drive The large Series 4 final drive is extremely robust and
is engineered to endure the highest loads. A double
gearbox seal with automatic seal monitoring offers
dependable protection.
Robust steel structure
Modular-design
main frame
The main frame is of the proven modular design,
resulting in high torsional rigidity and optimal
absorption of the forces to which it is exposed.
Components subjected to particularly heavy loads
are made of cast steel.
Solutions for a long lifetime
Innovative cooling
system
The electronically controlled suction-type fan con-
trols the operating temperature reliably and regard-
less of the engine speed. Extra-large radiator fins
ensure good self-cleaning.
Optimally protected
wiring harness
High-quality material for the protection of the wiring
harness and a well-designed layout ensure the func-
tional reliability of the machine.
Components in life-cycle tests
• FE analysis is used during the devel-
opment phase to design the com-
ponents, thereby ensuring that they
are optimally configured to withstand
heavy-duty use.
• The components are then subjected to
intensive long-term tests. Only parts
that meet the high quality standard are
used in the machines.
State-of-the-art cooling system
• The hydrostatically driven fan matches the
cooling performance to the cooling require-
ment, meaning that the engine reaches an
optimal operating temperature more quickly.
• Air is taken in from dirt-protected zones,
thereby minimizing contamination caused by
dust particles.
• Optional: Reversible fan for the quick cleaning
of the radiator in particularly dusty conditions.