Mercedes-Benz Zetros 2020 Operating Instructions Manual page 134

Trailers/semitrailers
132
rect height before coupling up, e.g. by using
the height adjustment device.
Couple up the trailer by reversing the tractor
vehicle. Never let the trailer run on.
G
WARNING
If you uncouple a trailer with an engaged
overrun brake, you could trap your hand
between the vehicle and the trailer drawbar.
This poses a risk of injury.
Do not uncouple a trailer with an engaged
overrun brake.
Coupling jaw
Example: securing knob
X
Before coupling on the trailer: apply the
parking brake and release the service brake
on the trailer; see the manufacturer's oper-
ating instructions.
X
Chock the trailer's rear wheels to prevent it
from rolling away.
The unbraked front axle of the trailer must
remain pivotable.
X
Set the towbar supports to the height of the
trailer coupling; see the manufacturer's
operating instructions.
X
Back up slowly until the trailer coupling
locks.
X
After coupling: check to ensure that the
trailer's coupling pin is positioned correctly
on the control pin or securing knob :.
X
Connect the cable and compressed-air lines
Y
( page 134).
Hook coupling
X
Apply the parking brake on the trailer and
release the service brake.
X
Before coupling up, secure the trailer
against rolling away by using wheel chocks
on the rear wheels.
The unbraked front axle of the trailer must
be able to turn.
X
Position the towbar at the height of the
trailer coupling.
X
Pull out retainer : on the trailer coupling.
X
Swivel retainer : back towards the trailer
coupling.
X
Press lever ; forward in the direction of
the arrow.
The trailer coupling opens.
X
Reverse the towing vehicle until the eyelet
of the towbar hits the trailer coupling.
The trailer coupling closes and is automati-
cally secured.
X
Check that the trailer coupling is completely
closed. If not, pull lever ; backward until
retainer : automatically engages.
X
Connect the compressed-air lines and
cables.