Operator comfort: Intuitive operation
The operator quickly finds his bearings in the new cab of the PR 776 platform which was developed especially 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’s hand with only one electronic input element. This intuitive operating concept was subject to rigorous testing at Liebherr and is an important innovation of the 70-tonne (77.2-ton) crawler tractor category, particularly in mining applications.
The modern and spacious workstation in the PR 776 ensures excellent environment for greater performance and relaxed working conditions. The cab is designed for the job. All instruments and operating controls are carefully organized for easy reach. All key functions and machine settings can be adjusted by the operator via touchscreen display. ECO function parameters, automatic engine speed reduction, travel drive response, steering as well as standard safety functions such as the rear view camera can be all be accessed through the intuitive touchscreen display.
Operators can conveniently adjust multiple machine settings including travel drive, blade and rear ripper to their needs. Ergonomically shaped joysticks ensure operator comfort. An automatic air-sprung seat detects and adjusts to the operator’s shape and deactivates the machine when exiting the cab without a safety lever having to be actuated.
Maximum safety with excellent view of equipment and surrounding area
The modern design of the new Liebherr PR 776 offers all-round visibility for safe and efficient day-to-day operation. Safety is enhanced by the excellent visibility of the worksite, the blade and rear ripper, which is assured by the larger panoramic windows and downward slopes of the PR 776. A new feature in this class is the Roll Over Protective Structure (ROPS) / Falling Object Protection Structure (FOPS) integrated directly in the cab structure as standard for Liebherr crawler tractors.
Forward visibility is completely unobstructed as the exhaust system and lifting rams have been positioned behind the A-pillars. Also, the side view of the working area is clear and unobstructed by the extended work platform. This allows access to the cab, service points and filler necks for auxiliary and operating fluids.
Another safety factor are the newly developed illuminated safety steps. Depending on the chosen equipment level, high performance LEDs are used for ideal illumination of the work area. The modular lighting concept is one feature of the new machine design and makes it possible for the lighting to be adapted optimally to the respective use.
Reliability: robust components manufactured in-house
Liebherr diesel engines have powered construction machinery all around the world for decades. Developed for tough conditions, they guarantee maximum operational safety, reliability and a long service life thanks to the robust design and state-of-the-art technology. With the tried-and-tested hydrostatic Liebherr travel drive, components with high wear such as multi-speed gearboxes, steering clutches or service brake, are not installed. Instead, the high-quality hydraulic pumps and engines work practically wear-free and are particularly reliable.
Liebherr also has different custom-developed configuration packages for extreme applications such as deserts where extreme climates and low temperatures are common.
Optimal service accessibility and long change intervals
Centrally located maintenance points, access flaps and engine compartment doors that open to a wide angle, a tilting cab as standard equipment and, as an option, a radiator fan that can be swung out for cleaning – all of these are features that speed up and simplify servicing work on the new Liebherr crawler tractor. The new 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.
The standard Liebherr fleet management system LiDAT provides an accurate and 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 is updated several times a day and can be called up whenever needed via the Internet.