Liebherr HS 825 HD Litronic - Manual (Page 10)

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Winches
The maintenance-free Liebherr free-fall winches are installed as complete
units. The new concept with integrated drive and multi-disc brakes allows
increased drum width with the same outside dimensions, thereby increasing
rope capacity on the fi rst layer. This produces a longer rope life and reduced
operational costs. The integrated free-fall brakes prove their worth espe-
cially in diffi cult free-fall operations with heavy loads. The main winches are
driven via an axial piston displacement pump and a variable fl ow oil motor
in closed circuit. This design allows precise work cycles for all winch
movements. The supplied energy is ideally used in acceleration and
braking of the winches and regained when operating in the power
lowering mode.
Through automatic speed adjustment according to line pull
the high pressure controlled, variable fl ow hydraulic motors
allow full utilization of engine power even when working
with intermediate load.
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