Liebherr PR 776: Infinitely variable hydrostatically powered crawler tractor in the 70-tonne category

With the PR 776, Liebherr unveils its first crawler tractor in the 70-tonne category. The new PR 776 is powered by a Liebherr 12-cylinder diesel engine developing 565 kW (768 HP / 759 HP). The PR 776 has a maximum operating weight of 74 t and is equipped with blade capacities of 18 m³ (semi-U blade) or 22 m³ (U blade).

The proactive power control is another innovation of the 6th generation crawler tractors. If required, the engine power is automatically increased for a brief ­period based on the current requirement. As well as responding more rapidly, the machines offer a significant increase in performance potential and pulling power and a higher reverse speed. With the hydrostatic driveline, constant engine speed can be maintained and the crawler tractors always operates in the economically optimum range. Another key advantage of hydrostatically powered crawlers when working in restricted spaces is the excellent manoeuvrability with continuous power to both tracks. Pendulum-mounted guide wheels and track rollers ensure excellent chain traction and significantly reduce equipment vibration.

The new PR 776 has exceptionally long change intervals for operating fluids, which can be as long as 8000 hours of operation.

LiDAT, Liebherr’s standard fleet management system, provides an accurate, efficient overview of essential servicing work, warning messages, the machine’s position and actual consumption data and filling levels.


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