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Digger Man Blog

by Nick Drew  |  Mon 14 Mar 2016

Liebherr’s” big pusher” heads for Bauma

Liebherr’s 70 tonne class dozer the PR 776, the world’s first hydrostatic powered crawler tractor in this size class is on its way to Bauma!

Liebherr’s” big pusher” heads for Bauma
The largest dozer in the Liebherr range will be making its world premiere at Bauma in Munich next month and is sure to turn a lot of heads with its Hi-Drive track design and according to Liebherr it will offer end users significantly lower fuel consumption than the current industry standard whilst offering similar pushing performance. The machine was loaded last week in Telfs (Austria) and on Friday the machine was transported to the Bauma showground in Munich . PR776_Transport Bauma 2016_01_Screen The new PR 776 is powered by a Liebherr 12-cylinder diesel engine developing 565kW (768 HP / 759 HP). The PR 776 has a maximum operating weight of 74 t and is equipped with blade capacities of 18 m³ / 23.5 yd3 (semi-U blade) or 22 m³ / 28.8 yd3 (U blade). PR776_Transport Bauma 2016_02_Screen The modern drive concept of the new PR 776 offers extremely efficient and safe operation to customers. A new feature in this machine class is the infinitely variable hydrostatic travel drive, which is used for all crawler tractors from Liebherr. Another advantage of the modern drive concept is the optimization of pressure flow. Hydraulic servo pressure is based on-demand according to the task. If, for example, the full feed of pressure supply is not required when operating, this is automatically returned. PR776_Transport Bauma 2016_03_Screen The ECO function is standard for all Liebherr Generation 6 crawler tractors – including the new PR 776. 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. PR776_Transport Bauma 2016_04_Screen The proactive power control is another innovation of the 6th generation crawler tractors. Internal engine and external machine parameters are recorded, such as the current deflection of the joystick. 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. PR776_Transport Bauma 2016_05_Screen The operator quickly finds his bearings in the new PR  776 cab which has been specifically designed for this machine class. A focal point for development was the simple and safe operation of the crawler tractor. The multifunction joystick houses all operating and steering movements at the palm of the operator’ hand with only one electronic input element. This intuitive operating concept was subject to rigorous testing at Liebherr and is an important innovation for the 70 t crawler tractor’s category, particularly in mining applications. The PR 776 is going to be of great interest to visitors to the forthcoming Bavarian machinery fest, I am looking forward to seeing it and all the other attractions that Liebherr have planned for us.

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