Variable steering concept, Active rear axle steering – Liebherr LTM 1055-3.2 User Manual
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LTM 1055-3.
2
7
Variable steering concept
Active rear axle steering
The rear axles are electro-hydraulically actively steered depending on the
speed and the steering angle of the front axles.
5 steering programs (P) are preselectable by push button.
• Distinct reduction of the tyre wear
• Improvement of the manoeuvrability
• Stable driving performance also at high speeds
• All 3 axles steerable
High safety standards –
complete know-how from Liebherr
• Centering cylinders for automatic straightening of the rear axles in case of
failure
• Two independent hydraulic circuits with wheel driven and engine driven hy-
draulic pumps
• Two independent control computers
P1 Road steering
The axle 1 is mechanically steered by the
steering wheel. The axle 3 is actively steered
depending on the speed and on the steering
angle of the front axle. Above 30 km/h it will be
adjusted to straight driving and fi xed
P2 All-wheel steering
The axles 2 and 3 are turned by the steering
wheel depending on the steering angle of the
front axle to provide for the smallest turning
radius
P3 Crab steering
The axles 2 and 3 are turned by the steering
wheel to the same direction as the steering
position of axle 1
P4 Reduced swing out
The axles 2 and 3 are turned depending on the
wheel turn of the 1. axle to minimize the back
swing of the rear of the chassis
P5 Independent rear axle steering
The axle 1 is steered by the steering wheel, the
axles 2 and 3 are steered by push buttons inde-
pendently from the steering angle of the axle 1
Centering cylinders at the rear
axles
• Automatic straight positioning of the
rear axles in case of failure