PR 744 L Litronic Liebherr PR 744 L Litronic Specifications & Technical Data (2006—2020)

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. Liebherr has over 30 years of experience in the construction of hydrostatically driven tractors. The Generation 4 of high-performance crawler tractors are the perfect machines for a wealth of applications.

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 unite high performance and fuel economy – guaranteeing an enormous pushing power with low fuel consumption in conjunction with the efficient drive system. Liebherr crawler tractors are consistently designed with cost-effectiveness in mind, resulting in low fuel consumption, high productivity, long component service lifetimes and low maintenance costs.

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. Due to their high quality and excellent engineering, these machines offer maximum availability. Components developed by Liebherr specifically for use in construction machinery guarantee operational reliability in even the toughest conditions.

Optimised blade design for improved rolling of the material

The blade contours of the PR 734 and PR 744 machines have been further optimised. 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.

Low machine centre of gravity

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

Low fuel consumption

The Liebherr diesel engine operates at a consistent speed at all times, regardless of the given travel speed. The engine is not throttled and re-accelerated, thereby guaranteeing economical fuel consumption.

Low engine speed

The low engine speed results in significantly enhanced filling of the cylinder chambers and, as a consequence, more efficient fuel combustion.

Low maintenance costs

The maintenance intervals are optimally geared to the individual components. Maintenance-free bearings are used in exposed dirty areas, for example on the dozing frame.

Good accessibility

All service points of the diesel engine are accessible from one side of the machine, while the tilting cab enables access to the components inside the machine. These measures allow servicing tasks to be carried out quickly and efficiently.

Liebherr drive train

Liebherr diesel engines were developed for the most demanding conditions of use. Their low rated speed ensures high operational reliability and a long lifetime.

Solutions for a long lifetime

The electronically controlled suction-type fan controls the operating temperature reliably and regardless of the engine speed. Extra-large radiator fins ensure good self-cleaning.

Optimally protected wiring harness

Top-quality material for the protection of the wiring harness and a well-designed layout ensure the functional reliability of the machine.

High productivity

The powerful Liebherr diesel engine in combination with the innovative Liebherr travel drive guarantees sufficient 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. The tracks are prevented from slipping and maximum power is transmitted to the ground at all times.

A diversity of applications

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.

Efficient drive system

The hydrostatic travel drive offers excellent efficiency across the entire speed range. The oil temperature remains low even when high power output is required at low travel speeds (ripping work).

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. Standardised 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 cope with the highest loads. A double gearbox seal with automatic seal monitoring offers dependable protection.

Safety in every situation

The crawler tractor is driven with positive power transmission at all times, even on gradients. The self-locking action of the system (hydrostatic drive) allows the operator to control braking simply by reducing joystick movement. A parking brake in the final drive that is automatically activated when the machine is stationary is an additional safety feature.

Robust steel structure

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.

Comfort

The redesigned workplace offers the operator a remarkable degree of comfort. Spacious, quiet and designed with ergonomics in mind, Liebherr comfort cabs offer the ideal conditions for fatigue-free, concentrated work. Excellent visibility facilitates safe and precise operation.

A top-class cab

The ergonomically-designed operator’s workplace offers the ideal environment for relaxed, productive work. All instruments and operating controls are laid out comprehensibly and within easy reach.

Straightforward and precise control

All travel movements can be controlled easily and precisely with only one joystick – including the “counter-rotation” function.