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Raise the vehicle level or lower the semitrailer
#
until the instrument cluster shows the ï
Coupling level reached
event window.
Reverse slowly until the fifth-wheel coupling
#
1
locks.
The ¤ indicator lamp on the instrument
cluster will light up green.
If, during reversing, the instrument cluster
#
shows the red £
Driving level below cou-
pling level
event window:
Correct the coupling level again until the
instrument cluster shows the ï
level reached
event window.
Coupling up vehicles without a monitored
semitrailer coupling:
Reverse slowly until the fifth-wheel coupling
#
1
locks.
After coupling up:
Stop the vehicle and apply the parking brake.
#
Secure the fifth-wheel coupling
#
unauthorised operation and check the locking
mechanism; see the manufacturer's operating
instructions.
Retract the saddle supports fully; see the
#
manufacturer's operating instructions.
Connect the cables and compressed-air lines
#
(
page 290).
/
Coupling a trailer
Prior to coupling up
& WARNING Risk of accident due to longi‐
tudinal play of the trailer coupling
If the trailer coupling has too much longitudi‐
nal play, the trailer could tear away.
You could lose the trailer as a result.
Check the trailer coupling daily for lon‐
#
gitudinal play
by moving the towbar body of the trailer
#
coupling backwards and forwards firmly.
Have any longitudinal play rectified at a
#
qualified specialist workshop as soon as
possible.
The longitudinal play cannot be checked on the
coupling jaw.
Coupling
Apply the parking brake and release the
#
service brake on the trailer; see the manufac‐
turer's operating instructions.
Use chocks to secure the trailer's rear wheels
#
against rolling away. The unbraked front axle
of the trailer must still be able to turn.
1
against
Set the towbar support to the height of the
#
trailer coupling; see the manufacturer's oper‐
ating instructions.
Coupling up: back up slowly until the trailer
#
coupling locks.
After coupling up
Check to ensure that the trailer's coupling
#
bolt is positioned correctly on the securing
knob
Connect the cables and compressed-air lines
#
(
page 290).
/
Uncoupling
* NOTE Damage to the vehicle frame on
vehicles with air suspension
Prior to uncoupling, lower vehicles with
#
air suspension until a gap appears
between the semitrailer plate and fifth
wheel coupling. Otherwise, the chassis
will spring up suddenly during uncou‐
pling. This could cause damage to the
chassis and the semitrailer.
Park the vehicle on a firm and level surface.
#
Apply the parking brake.
#
Use chocks to secure the trailer/semitrailer
#
against rolling away.
Driving mode 289
1
or check pin of the trailer coupling.
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