The machines’ cabs and controls have been redesigned for greater operator comfort.
Liebherr has met the requirements of Stage IV with the use of selective catalytic reduction (SCR) as after treatment on its own 6-cylinder engines which are used on both the PR 746 and PR 756. The hydrostatic system also acts as a brake when required, and can hold the dozer still on steep inclines. Liebherr also says the hydrostatic drive helps with fuel economy, as the engine is kept at a constant revs at its most efficient point, with other on-board systems managing travel and other functions. Mounting a motor on each track not only means high ground clearance, as there is no axle, but also allows the tracks to counter-rotate, so the dozers can more or less turn on the spot. The use of this technology over a traditional transmission and axles has a number of advantages.Īcceleration to top speed is smooth and continuous, with no gear changes. They join the PR 736 Litronic, which was the first Generation 6 machine to be released in April.Īs with many other Liebherr machines, the company uses hydrostatic drives for its dozers, and as such the PR 756 Litronic is the largest hydrostatic drive dozer in the world. At around 30 tonnes weight and with a 185 kW engine, the PR 746 Litronic equates to a Caterpillar D8 dozer, while the 40 tonne class, 250 kW PR 756 Litronic competes with the D9. Development work at the factory has continued a pace this year, with new additions to Liebherr’s Generation 6 dozers now rolling out, along with brand new telescopic handlers, which will add significantly to the range Liebherr offers.Īs far as the dozers are concerned, Liebherr has now released Stage IV/Tier 4 Final-compliant versions of the two largest machines in its Generation 6 range. Liebherr’s plant in Telfs, Austria manufactures the group’s range of dozers, crawler loaders and telescopic handlers. The new Generation 6 PR 756 Litronic is the largest hydrostatic drive dozer in the world.
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