Liebherr PR 744 User Manual

5 (1)

Crawler Tractors

PR 734

PR 744

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Engine Output (SAE J1349):

150 kW / 201 HP

185 kW / 248 HP

Operating Weight:

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

Engine Output (SAE J1349): 185 kW / 248 HP

 

Operating Weight:

20,388 - 24,961 kg

Operating Weight:

24,605 - 31,669 kg

 

 

44,948 - 55,030 lb

 

54,245 - 69,818 lb

 

Blade Capacity:

3.80 - 5.56 m³

Blade Capacity:

4.90 - 7.20 m³

 

 

4.97 - 7.27 yd³

 

6.41 - 9.42 yd³

 

Hydrostatic travel drive with

Hydrostatic travel drive with

 

electronic control

 

 

 

electronic control

 

 

 

 

 

 

 

 

 

 

 

 

2 PR 734 Litronic PR 744 Litronic

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 sin- gle-joystick enables sensitive and reliable control of the machine.

PR 734 Litronic PR 744 Litronic 3

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°.

4 PR 734 Litronic PR 744 Litronic

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

The hydrostatic travel drive enables the operator

ripping power

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

The entire front-end superstructure of the machine is

characteristics

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

The hydrostatic drive has a further advantage when

maneuverability

working in confined spaces. All travel movements

 

can be performed quickly and without difficulty,

 

including counter-rotation.

Low machine

The layout of the drive components results in an

center of gravity

extremely low machine center of gravity, which per-

 

mits safe operation during even the most challeng-

 

ing applications on slopes and embankments.

Liebherr hydrostatic drive

 

Optimized blade design

 

• Automatic speed and torque adjustment

 

• The blades are defined by uncom-

constantly optimizes the machine’s power

 

promising penetration characteris-

flow in the event of load changes.

 

tics and outstanding rolling of the

• Even at low speeds, for example in demand-

 

material. The sloping top corners

 

of the blade allow the operator to

ing ripping operations, the thermal load of

 

 

quickly ascertain blade filling.

the hydrostatic travel drive remains low.

 

 

 

The high efficiency of the drive remains

 

• Robustly-built using wear-resistant

almost unchanged.

 

 

materials, Liebherr blades excel

 

 

 

 

under even the most demanding

 

 

conditions.

 

 

 

 

 

 

 

 

 

PR 734 Litronic PR 744 Litronic 5

Liebherr PR 744 User Manual

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.

Specific fuel

consumption [g/kWh]

Engine speed [1/min]

6 PR 734 Litronic PR 744 Litronic

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