Liebherr USA Co.’s new dozer, the PR 776 Generation 6, debuted at the 2018 Elko Mining Expo. The new PR 776 is powered by a Liebherr 12-cylinder diesel engine developing 768 hp/759 hp. It has a maximum operating weight of 161,354 lb. and is equipped with blade capacities of 23.5 cu. yd. (semi-U blade) or 28.8 cu. yd. (U blade).
A new feature is the hydrostatic drive. The modern drive concept automatically adjusts speed and torque, optimizing the transmission of the engine power to the tracks as load changes. This produces exact and powerful steering, and track slip is minimized allowing operators to focus completely on their work.
The intelligent Liebherr engine-management system combined with the Liebherr Power Efficiency System and the new hydrostatic drive allows Liebherr to master and optimize all equipment systems and processes to maintain constant engine speed, increase overall machine efficiency and reduce fuel consumption. This differentiates Liebherr’s travel drive concept from other drive concepts available on the market, and comes standard in all Generation 6 Liebherr dozers.
With an optional GPS navigation system, the work progress and surrounding area can be visualized, increasing machine productivity and minimizing operator stress and strain. Pendulum-mounted guide wheels and track rollers ensure excellent chain traction and significantly reduce equipment vibration.
The ECO function is also standard. It allows operators to choose between high performance and maximum efficiency. The ECO control system enables greater travel drive efficiency in light to medium operations, and also provides greater fuel savings.
All of these measures, according to the manufacturer, lead to significantly lower fuel consumption than the industry standard with similar pushing performance.
Centrally located maintenance points, access flaps and engine compartment doors that open to a wide angle, a tilting cab as standard and, as an option, a radiator fan that can be swung out for cleaning are all features that speed up and simplify servicing work.
The PR 776 has exceptionally long change intervals for operating fluids such as hydraulic or engine oil. Depending on the nature of the work, and provided that regular checks are performed, the change interval for Liebherr-plus oils can be as long as 8,000 hours of operation.