Liebherr PR 744 User Manual

PR 734 PR 744Crawler Tractors

Engine Output (SAE J1349): 150 kW / 201 HP 185 kW / 248 HP
Operating eight:W 20,388 - 24,961 kg 24,605 - 31,669 kg

44,948 - 55,030 lb 54,245 - 69,818 lb

PR 734

PR 744

Engine Output (SAE J1349): 150 kW / 201 HP
Operating Weight:
44,948 - 55,030 lb
Blade Capacity: 3.80 - 5.56 m³

4.97 - 7.27 yd³
Hydrostatic travel drive with
electronic control

20,388 - 24,961 kg

Engine utput O (SAE J1349): 185 kW / 248 HP
Operating Weight: 24,605 - 31,669 kg
54,245 - 69,818 lb
Blade Capacity: 4.90 - 7.20 m³

6.41 - 9.42 yd³
Hydrostatic travel drive with
electronic control

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Performance

Sheer strength and innovative technology – these are the
hallmarks of the generation 4 of Liebherr crawler trac­tors. The impressive balance between operating weight
and engine output assures maximum productivity under
all conditions. Whether during ripping, dozing or grading,
the PR 734 and the PR 744 excel in any application with
outstanding performance.

Reliability

Strong and robust: In terms of their construction and qual­ity of materials, Liebherr crawler tractors are consistently
designed with longevity in mind. Parts that are subjected
to considerable stress are produced from high-strength
material; critical components are optimally protected. All
this makes Liebherr crawler tractors the benchmark for
reliability and availability.

Economy

Clear economic benefits speak for Liebherr. Like all
Liebherr machines, the PR 734 and the PR 744 boast
an exemplary service concept. This reduces both down
times and maintenance costs. Our latest-generation diesel
engines combine high performance and fuel economy –
guaranteeing exceptional pushing power with low fuel
consumption and the efficient drive system.

Comfort

Generation 4 crawler tractors offer a spacious and com­fortable workplace designed according to state-of-the-art
ergonomic standards, giving the operator an excellent
view of the work area and the blade. The intuitive sin­gle-joystick enables sensitive and reliable control of the
machine.

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Liebherr diesel engine

•State-of-the-arttechnology:Pump-line-

nozzle injection system, 4-valve techno­logy, turbocharger with charge-air inter­cooling and electronic engine management
ensure power reserves in every situation.

•Environmentally-friendlyandeconomical:

Complies with the latest exhaust emissions
standards 2004/26/EC Stage IIIa (EU) and
EPA/CARB Tier 3 (US).

•Extra-deepoilsumppermitstravel
on gradients up to 45°.

Performance

Liebherr has over 30 years of experience in the manufacture of hydrostatically
driven tractors. The high-performance generation 4 crawler tractors are the per­fect machines for a wide variety of applications.

High productivity

High drawbar pull

The powerful Liebherr diesel engine in combination
with the innovative Liebherr travel drive guarantees
ample power in all situations. The drive system
does not require any gearshifting, which means that
engine power is transferred to the tracks without
interruption – even when cornering.

High dozing and
ripping power

The hydrostatic travel drive enables the operator
to define the optimal travel speed and drawbar pull
with ease - preventing the tracks from slipping and
ensuring that maximum power is transmitted to the
ground at all times.

Optimized blade design
for improved rolling of
the material

The blade contours of the PR 734 and PR 744
machines have been further optimized. Improved
rolling of the material enables the machine to achieve
even higher productivity.

Best levelling
characteristics

The entire front-end superstructure of the machine is
torsionally rigid and robust. In conjunction with the
long track frames, this ensures smooth operation of
the blade at all times.

A diversity of applications

Outstanding
maneuverability

The hydrostatic drive has a further advantage when
working in confined spaces. All travel movements
can be performed quickly and without difficulty,
including counter-rotation.

Liebherr hydrostatic drive

•Automaticspeedandtorqueadjustment

constantly optimizes the machine’s power
flow in the event of load changes.

•Evenatlowspeeds,forexampleindemand­ing ripping operations, the thermal load of
the hydrostatic travel drive remains low.
The high efficiency of the drive remains
almost unchanged.

Low machine
center of gravity

The layout of the drive components results in an
extremely low machine center of gravity, which per­mits safe operation during even the most challeng­ing applications on slopes and embankments.

Optimized blade design

•Thebladesaredenedbyuncom­promising penetration characteris­tics and outstanding rolling of the
material. The sloping top corners
of the blade allow the operator to
quickly ascertain blade filling.

•Robustly-builtusingwear-resistant

materials, Liebherr blades excel
under even the most demanding
conditions.

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Specific fuel

consumption [g/kWh]

Engine speed [1/min]

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Consistent engine speed
for low fuel consumption

•Theratedenginespeedliesinthe

range of lowest specific fuel con­sumption, thereby ensuring maxi­mum operating efficiency.