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Liebherr PR 764 Litronic Is Biggest Hydrostatically Driven Crawler

Wed August 10, 2011 - National Edition
CEG


The D 9508 422-hp (310 kW) Liebherr V8 diesel engine drives the crawler by means of four variable displacement pumps and engines each in a closed circuit.
The D 9508 422-hp (310 kW) Liebherr V8 diesel engine drives the crawler by means of four variable displacement pumps and engines each in a closed circuit.

Drawing on practical experience with the PR 752 Litronic push dozer, Liebherr is moving its crawler range up a notch with the PR 764 Litronic.

The flagship of the Liebherr crawler tractor range works on a revolutionary drive concept: the D 9508 422-hp (310 kW) Liebherr V8 diesel engine drives the crawler by means of four variable displacement pumps and engines each in a closed circuit. This drive system does not merely deliver maximum pushing and ripping performances in all speed ranges; it also makes the PR 764 Litronic, with its operating weight of up to 57.8 tons (52.5 t), the biggest hydrostatically driven crawler in the world, according to the manufacturer.

Machine Design

The PR 764 Litronic has the same profile and ergonomic concept as all fourth-generation Liebherr crawlers. With a completely redeveloped operator cabin and the characteristically sloping outer edges, it gives the operator the improved all-round vision and an enhanced view of the blade and the rear ripper.

The generously dimensioned operator’s cabin, with its numerous storage surfaces, additional coolbox container and standard air-conditioning unit, completes the high degree of operator comfort in the new Liebherr crawler.

Noise levels in the cabin itself, which are already minimal due to the good insulation features, are reduced even further by the low-revving 1,600-rpm engine and the demand-controlled hydrostatic ventilators.

Easily accessible maintenance flaps, a fuel tank filling point on the side, the standard tippable cabin and the centrally positioned maintenance modules make the PR 764 easy to maintain and also ensure safe operation, according to the manufac-turer.

Maximum Pushing and Ripping Performance

With its stepless drive system, good driving speeds and pulling power, the PR 764 Litronic is capable of whatever the job demands. Irrespective of whether the machine is being used for heavy ripping jobs or to transport material, the optimum drive ratio is always available. Gear changes do not interrupt the power delivery because the diesel engine runs continuously in the optimum revolution range. This reduces fuel consumption, thereby lessening the environmental impact, and also increases the machine’s working life.

Right in the development stage of the new machines, the design input was focused on the toughest applications. This is why, for example, the PR 764 Litronic has hydrostatically driven, demand-controlled cooling equipment and a wear-free braking mechanism via the hydrostatic drive system as standard, as well as optionally available anti-wear protection for all exposed working parts, according to the manufacturer.

For more information, call 757/928-8746 or visit www.Liebherr.com.