Product feature: Liebherr's new PR 776 dozer

Liebherr has unveiled it's new dozer - the PR 776

Liebherr has unveiled the PR 776 that’s powered by a 12-cylinder diesel engine, producing 565kW (768hp/759hp), with a maximum operating weight of 74 tonnes and equipped with blade capacities of 18 cubic metres (semi-U blade) or 22 cubic metres (U blade).

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Intelligent management systems

A new feature in this machine class is the infinitely variable hydrostatic travel drive, which provides optimisation of pressure flow, where hydraulic pressure is based on demand according to the task. So if the full feed of pressure supply is not required when operating, it’s automatically returned.

The proactive power control is another innovation of the sixth-generation dozers. If required, the engine power is automatically increased for a brief period based on the current requirement.

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The Liebherr engine management system combined with the Liebherr Power Efficiency System and the hydrostatic driveline allow the PR 776 to maintain a constant engine speed, helping increase overall machine efficiency and reduce fuel consumption.

Another key advantage of hydrostatically powered dozers when working in restricted spaces is the continuous power to both tracks helping maneuvereability.

With an optional GPS navigation system, the work progress and the surrounding area is easily seen, increasing machine productivity and minimising operator stress and strain.

Intuitive operation

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The multi-function joystick houses all operating and steering movements in the operator’s hand with only one electronic input element. This intuitive operating concept was subject to rigorous in-house testing and is an important innovation for the 70-tonne dozer’s category, particularly in mining applications.

The workstation in the PR 776 has been engineered to provide greater performance and relaxed working conditions, with instruments and operating controls organised for easy reach. All key functions can be accessed through Liebherr’s intuitive touchscreen display.

Operators can adjust multiple machine settings, including travel drive, blade, and rear ripper to their needs. The automatic, air-sprung seat detects and adjusts to the operator and deactivates the machine when exiting the cab, without a safety lever having to be actuated.

Maximum safety and view

Though standard for Liebherr dozers, the integrated ROPS/FOPS protection in the cab structure is new to the 70-tonne class.

The large panoramic windows and downward slopes on the PR 776 help enhance the safety of the work area along with the blade and ripper. Forward visibility is said to be completely unobstructed as the exhaust system and lifting rams have been positioned behind the A-pillars, while the side view of the working area is clear and unobstructed by an extended work platform. Another safety factor is the newly developed illuminated safety ladders using high-performance LEDs.

Robust components manufactured in-house

Liebherr says they guarantee maximum operational safety, reliability, and a long service life, thanks to the robust design and state-of-the-art technology. There are also different configuration packages for extreme applications, such as very hot or cold climates.

Optimal service accessibility and long change intervals

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Helping simplify servicing on the Liebherr PR 776 are centrally located maintenance points, wide opening access flaps, and engine compartment doors as well as a tilting cab. As an option, a radiator fan that can be swung out for cleaning is available.

Depending on the type of work, the PR 776 has long service intervals for operating fluids such as hydraulic or engine oil. The change interval for Liebherr-plus oils can be as long as 8000 hours of operation.

The standard Liebherr fleet management system LiDAT provides an accurate, efficient overview of essential servicing work, warning messages, the machine’s position, and actual consumption data and filling levels. Depending on the agreement with the customer, the data can be updated several times a day and is available whenever needed via the Internet. 

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