How Did Liebherr Create The First Hydrostatic Bulldozer in the 70-Tonne Class

Liebherr didn’t simply build a bigger bulldozer. It spent decades figuring out how to make hydrostatic drive survive as the machines became heavier, hotter, more powerful, and more demanding.

This is the story of how that development led to the PR 776 — the first hydrostatically driven crawler tractor in the 70-tonne class. From Liebherr’s early hydrostatic dozers in the 1970s to the packaging, cooling, control, durability, and traction problems that appeared as the machines grew, every solution exposed another limit.

By the time the PR 776 reached mines around the world, its drivetrain had to do far more than move a huge bulldozer. It had to steer under load, control enormous track torque, manage heat, reduce fuel consumption, remain serviceable, and survive thousands of hours in some of the harshest working environments on Earth.

This is how nearly forty years of engineering made a 70-tonne hydrostatic bulldozer possible.
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