PR 776 Litronic Liebherr PR 776 Litronic Specifications & Technical Data (2016—2020)

Superb Performance in Bulldozing and Ripping Operations

Power and innovative technology are essentially the hallmarks of Liebherr crawler tractors. Either in heavy-duty ripping work, transporting materials or grading, the PR 776 is an extremely powerful machine for any application.

Cost Efficiency Comes as Standard

Liebherr crawler tractors are designed from the ground up with economy in mind. Highly efficient drive concept, long service life of components and low maintenance requirements reduce operating costs and increase profits.

Fast Component Replacement

As part of the development work on the PR 776, Liebherr always ensures that all important components can be replaced quickly and easily, and sent in to the Liebherr REMAN programme for reconditioning. For example, the Liebherr travelling drives and their oil motors can be dismantled easily from one side when required. In the same way, the folding front section on the chassis provides optimum access to the Power-Pack (engine & transmission). This makes it possible to remove and reinstall the radiator and the Liebherr diesel engine quickly.

Tilting Cab

The standard cab can be tilted, if required allowing quick and easy access to all components of the travel drive and the operating hydraulics. This saves time and increases machine availability.

Long Service Intervals

With Liebherr hydraulic fluids, service intervals of up to 6,000 hours can be achieved. If Liebherr Plus oil are used, this extends service intervals to as much as 8,000 hours of operation. Maintenance times are reduced substantially which improves machine availability, it reduces downtime. Liebherr oils reduce fuel consumption by cutting down the resistance of moving components. This also provide high reliable corrosion protection and optimum compatibility with hydraulic hoses, seals and gaskets.

Maximum Safety for Driver and Maintenance Team

The Liebherr PR 776 offers a carefully thought out safety concept for drivers and for service personnel. Maintenance and service points are readily accessible and this, in conjunction with wide-opening covers, enables maintenance and service work to be carried out rapidly and safely. Moreover, the cab on the PR 776 offers a wide range of safety features.

Cost-Effective Maintenance

All items that the operator checks during daily routine inspections are readily accessible on one side of the engine. The hydraulically tilted cab provides easy access to components as well. Service work can be performed quickly and efficiently. The maintenance intervals are perfectly matched to suit individual components. In exposed areas zero-maintenance bearings are used. Particularly long maintenance intervals for engine oil and hydraulic fluid reduce costs and increase availability by reducing downtime periods.

Optimal Planning

Liebherr crawler dozers come with extensive standard warranties for the entire machine and the drive train. Customised inspection and service programs allow optimal planning of all maintenance activities. The Liebherr-Reman Programme provides a cost-effective way of upgrading components to meet the stringent quality standards of the originally manufactured equipment. Various reconditioning levels are available including replacement components and general overhaul or repair. This assures the customer the most economical and highest quality component for the service life of the machine.

Efficient Cooling System

Hydrostatic fans and coolers with widely spaced louvre slats deliver optimum cooling power in very dusty work environments. Requirements-based speed adaptation and flow-optimised fan blades result in fuel savings and minimal noise emissions.

Load Sensing Work Hydraulics

The system always provides the amount of power actually needed by the operating hydraulics. If the equipment is not being actuated, fuel is being saved.

Generously Dimensioned Final Drives with Automatic Temperature Monitoring

The durable final drives are extremely robust and have been designed to cope with exceptionally high loads. The double transmission seal with continuous temperature monitoring ensures reliable operation.

Robust Radiator Version

For work in very dusty environments, reliable and corrosion-resistant radiators/coolers are used. The louvre slats on these are spaced widely at 8 mm intervals. These offer optimum protection against dirt and environmental influences.

Highly Efficient Driveline

The high efficiency rating of the hydrostatic drive across the entire vehicle speed range and the efficient Liebherr diesel engine minimise fuel consumption and ensure that CO₂ emission levels are low.

Wear-Free Drive Concept

The tried and tested hydrostatic Liebherr travel drive does not require any components such as a torque converter, multi-ratio transmission, service brakes or steering couplings. The high-quality hydraulic pumps and motors operate reliably and practically without wear.

The Hydrostatic Drive as a Service Brake

The crawler tractor operates with continuous power on both tracks even when driving on slopes. Thanks to the self-locking nature of the hydrostatic system, the operator can bring the machine to a stop at any time simply by returning the joystick to the “neutral” position or by depressing the inching pedal. An automatically activated parking brake provides additional safety.

Maximum Driver Comfort for more Productivity

The completely redesigned working environment offers exceptional operator comfort. With its spacious ergonomic layout and low sound levels, the Liebherr comfort cab provides the perfect conditions for fatigue-free, focused work to optimise productivity.

Ergonomic and Purposely Designed

The well-thought-out design of the operator’s cab provides the essential conditions for relaxed and productive work. All instruments and operating controls are carefully organised for easy reach. An unobstructed view of the work equipment and perfect all-round visibility allows the operator to concentrate fully on the task in hand.

Convenience in Daily Use

Well thought-out solutions, such as a cooled storage compartment, additional footrests, adjustable joysticks and a powerful air conditioning system enhance operator comfort and productivity during daily operation.

Joystick Control

All driving functions can be controlled smoothly and precisely with only one operating element – including the “turning on the spot” function. The travel joystick is optionally available in either a proportional or a detented version – this allows control to be matched optimally to the needs of the operator.

Rear-Mounted Ripper Control Element in the Form of a Handle

The control element can be adjusted in 2 axes and as such can be adapted ergonomically to suit each driver during ripping applications, as well as providing a safe handle.

Safety-Plus Comfort Seat

The standard air-suspended seat adjusts perfectly to the operator and deactivates the machine automatically on exiting the cab.

Operator's Cab

Resiliently mounted cab with positive pressure ventilation and integrated air conditioning. All-round visibility with tinted windows. Windscreen wipers with interval control at the front and rear. With integrated ROPS Roll Over Protective Structure (EN ISO 3471) and FOPS Falling Objects Protective Structure (EN ISO 3449).

Operator's seat Monitoring

Air-suspended comfort seat, fully adjustable. Touch screen display of current machine information, automatic monitoring of operating conditions. Individual setting of machine parameters.

Main Frame with a Proven Box-Section Design

The main frame is constructed using a proven box-section design, which provides maximum torsional stiffness and optimal absorption of forces. Cast steel is used for components subjects to high stresses.

Optimised Equipment

Liebherr blades are manufactured using high-quality steels and are based on a modular design principle. The robust blade mountings provide optimum rigidity and enable the blade to be guided precisely. All rear-mounted ripper variants are designed for heavy-duty mining and extraction operations and deliver very high penetration forces. In addition, exposed areas such as bolt connections are protected by appropriate wearing materials.