Liebherr Expands the Range of the New Generation 6 Crawler Tractors Upwards – World Première of PR 746 and PR 756

The new Liebherr crawler tractor PR 746 Litronic offers an operating weight of 28,900 kg to 30,800 kg and its Liebherr diesel engine returns 185 kW / 252 HP. The largest of the new Generation 6 crawler tractors, the PR 756, has an operating weight of 38,300 kg to 41,150 kg and an engine output of 250 kW / 340 HP.

The new crawler tractors PR 746 and PR 756 are powered by 6-cylinder Liebherr diesel engines that comply with the stage IV / tier 4f emissions standards. In order for the requisite emissions and consumption targets to be fulfilled, Liebherr has optimised the entire combustion process and has already reduced the particulates within the engine to a minimum. For ideal adaptation of the various parameters, support is provided, among other things, by the development of an in-house common rail injection system including an in-house electronic engine management system.

The Generation 6 Liebherr crawler tractors feature a newly developed, electronically controlled drive management with integrated ECO function. This enables the driver to choose between high performance and maximum economy. Compared with the previous generation, the ECO control system ensures more efficient operation of the travel drive for light to medium-heavy operations.

Another new feature of the Generation 6 is the proactive power control. In this instance, internal engine parameters as well as external machine parameters are detected, such as the current degree of drive joystick deflection, resulting in engine performance being elevated automatically for a short period to match the current demand. As well as responding more rapidly, the machines offer a tangible increase in performance potential and pulling power.

The hydrostatic drive keeps the engine speed at a constant level. All of the drive components and the intelligent Liebherr engine management are harmonised optimally to each other. The Liebherr travel drive is distinguished by a high level of efficiency and low fuel consumption.

To simplify the use of automatic machine control systems, Liebherr supplies ex-factory preparation kits for leading manufacturers’ systems; these kits are also available for Generation 6 models. This makes it significantly easier to install 2D and 3D control systems and affords the operator the highest level of flexibility in choosing the system.

The combined inch brake pedal installed as standard on both machines makes it easier to switch from conventionally driven machines to the new Liebherr Generation 6 crawler tractors because the braking function of the hydrostatic travel drive can also be activated with the foot pedal as well as the joystick. An optimal enhancement to this is the 3-stage drive joystick (forward, stop and reverse positions), which is available as an option.