Liebherr has extended its generation 6 crawler tractor series to include the PR 726 Litronic, the successor to the successful PR 724. The series now totals four models with operating weights of approximately 16 metric tons to 41 metric tons, which comply with the emissions standards of Stage IV / Tier 4F.
The new Liebherr PR 726 Litronic debuted at NordBau 2015 held in Neumünster, Germany, from September 9-13, with the official start of sales in early 2016.
The dozer offers an operating weight of 16,000-19,800kg and its 4-cylinder Liebherr diesel engine returns 120kW (163hp). In order for the requisite emissions and consumption targets to be achieved, the entire combustion process has been optimized to reduce the particulates, even within the engine, to a minimum. To simplify the system and to optimize exhaust gas treatment, Liebherr relies on SCR technology for the PR 726. This makes the use of a DPF unnecessary and thereby simplifies maintenance for the customer.
As with all models in the range, the new PR 726 Litronic also features an electronically controlled drive management system with integrated eco function. This makes it possible for the operator to select between high performance and maximum economy and enables even greater travel drive efficiency in light to medium-duty operations.
The proactive power control is another sixth generation innovation. This involves the detection of various machine parameters and if required results in an automatic increase of the engine output. As well as responding more rapidly, the machines offer a tangible increase in pushing performance and dynamic response.
This hydrostatic drive keeps the engine speed at a constant level. All drivetrain components and the intelligent Liebherr engine management are optimally adapted to this speed, which makes a significant contribution to reduced fuel consumption.
The combined inching brake pedal facilitates the transition from conventionally driven machines to Liebherr generation 6 crawler tractors. With this equipment option, both the travel speed and the brake can be controlled via the foot pedal. A key enhancement is the three-stage joystick (which can be locked in forward, stop and reverse), which is also available as an option.
The PR 726 Litronic’s performance is supported by its comprehensive range of equipment. This starts at the front with a universal 6-way blade, with folding corners as an option for easy transport, extending through to a straight blade and semi-U blade for moving larger quantities of material. To further simplify machine transportation, a semi-U blade with an overall width of 3 meters for a track width of up to 610mm is also available.
At the rear, three- and five-shank rippers can be chosen as well as, for example, a hydraulic rope winch, counterweight or drawbar.
The modern design, with sloping edges on all sides and panoramic windows, offers the operator an optimum all-round view of the terrain as well as the blade and rear ripper. The view over the engine hood is completely clear as the exhaust stack and lifting cylinders have been positioned behind the A-posts. A good all-round view enhances efficiency and improves safety.
Numerous innovations in the cab area of the larger generation 6 machines have now filtered down into the compact class. The travel and operation joysticks make ergonomically safe handling possible thanks to the new T-shape. The required travelling speed range can be preselected directly on the joystick enabling control of the tractor to be selected precisely, especially at low speed. Driver detection takes place automatically by means of the integrated seat contact switch without a safety lever having to be activated.
The touch-sensitive system display for Liebherr earthmoving machines is also featured on the new PR 726 Litronic. This enables important operating parameters, such as the Eco function or the travel drive response and steering, to be adjusted intuitively and with a clear overview.
For optimum illumination of the working area, halogen headlights or high-performance LEDs are used depending on the chosen equipment level.
The PR 726 Litronic’s undercarriage is a completely new development. The segmented sprocket has a larger diameter with more teeth so that the operating life of the bushings and sprockets is extended. The Liebherr FTB undercarriage is also available as an option for the PR 726. This swivel undercarriage with rotating bushings, exclusively developed for Liebherr, is particularly well-suited for work on soft, abrasive ground and considerably extends the service life in sand, for example. If used in areas with impact loads, such as on stones and rocks, the trusted lubricated-for-life tracks are the ideal solution. Both undercarriage versions can be retrofitted retroactively.
September 11, 2015