RUNNING GEAR OPERATION
44
Operating instructions • Semitrailer • 505369471-04 • 02/2019
505821725-01
7
5
6
11
10
8
4
2
1
9
3
< 5"
7
5
6
11
10
8
4
2
1
9
3
+
> 5"
500626977-01
P
P
515040284-01
Senken / Stopp / Heben
Lower / Stop / Raise
Abgesenkt
Lowered
Fahrt
Drive
500626979-01
1
2
Fig. 5-23:
Control lever of the air suspension
1
Control lever
2
Pictogram
Depending on the make and design of the
lifting and lowering valves, the following
functions can be carried out using the air
suspension's control lever:
Control lever
position
Function
Drive*
The trailer is always kept at the
same height, regardless of the
load.
Raised
The trailer is raised, e.g. to ad-
just it for a ramp.
Raised and
engaged
The trailer is raised to the max-
imum possible lifting height.
Lowered
The trailer is lowered, e.g. to
adjust it for a ramp.
Lowered and
engaged
The trailer is lowered down to
its mechanical limit (air sus-
pension bellow without over-
pressure)
Stop
The trailer height achieved via
lifting or lowering is main-
tained.
* The driving position cannot be set manu-
ally on electronically controlled air suspen-
sion. Instead, the ride height is automatic-
ally set at a driving speed of > 15 km/h.
The operating instructions for the air sus-
pension's control lever are shown as a pic-
togram on the control unit.
515040284-01
Fig. 5-24:
Example pictogram of mechanic-
ally controlled air suspension
Fig. 5-25:
Example pictogram of electronic-
ally controlled air suspension
To prevent chassis damage, the version
with the lifting-lowering valve with auto-
matic ride height resetting automatically
sets the trailer back to the driving position
when the vehicle speed exceeds 15 km/h.
NOTE
Driving with the wrong lifting height
causes material damage!
Driving at the minimum or maximum lifting
height on an electronically controlled air
suspension can cause material damage to
the trailer.
► Do not drive at the minimum or max-
imum lifting height.