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Variable steering concept, Active rear axle steering – Liebherr LTM 1055-3.2 User Manual

Page 7

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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