Liebherr LTM 1220-5.2 - Manual (Page 7)

LTM 1220-5 .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. Five different steering programmes (P)
can be selected by push button.
• Distinct reduction of the tyre wear
• Improvement of the manoeuvrability
• Stable driving performance even at high speeds
• All 5 axles steerable
High safety standards – entire know-how from
Liebherr
• Centring cylinder for automatic straightening of rear axles in case of failure
• Two independent hydraulic circuits with wheel- and engine driven hydraulic
pump
• Two independent control computers
P1 Road steering
Axles 1 and 2 are steered mechanically
using the steering wheel. Axles 3, 4 and 5
are actively steered, depending on speed
and the front axles lock angle. At speeds
of 30 km/h and over, axles 3 and 4 are set
to straight-ahead position and locked; at
60 km/h and over, axle 5 is locked in the
same forward position.
P2 All-wheel steering
The axles 3, 4 and 5 are turned depending
of the axle lock of the front axles by the
steering wheel so far that smallest turning
radii are achieved.
P3 Crab steering
Axles 3, 4 and 5 are turned in the same
direction as the wheel lock on axles 1 and
2 using the steering wheel.
P4 Reduced swing out
The axles 3, 4 and 5 are turned depend-
ing on the axle lock of the front axles, so
that the swing out of the chassis rear gets
minimized.
P5 Independent rear-axle steering
The axles 1 and 2 are turned by using the
steering wheel; the axles 3, 4 and 5 are
steered by push button independently
from the axle lock of the axles 1 and 2.
Centring cylinder to straighten
rear axles
• Automatic straightening of rear
axles in case of failure