Maintenance
Operation
For Coupling types AK160, AK300 &
AK350.
Coupling Up
Open coupling handle. To do this pull the
coupling handle up (Fig. 14) in the direction
of the arrow.
The coupling mechanism has a fixed open
position, ie. as long as the coupling head is
not placed on the ball the coupling will
remain open.
Put the open coupling onto the towball. The
coupling handle automatically and audibly
clicks into position. In the interests of safety,
press the handle down by hand (Fig. 14).
The coupling head is correctly connected
when the green cylinder part of the safety
indicator is visible (when viewed from the
side - Fig. 14/Item 2).
The coupling mechanism is correctly
engaged when the coupling handle can no
longer be pressed down any further (by
hand).
Caution
If the coupling head is not correctly hitched
onto the towball, then the caravan/trailer can
become disconnected from the towing
vehicle.
Uncoupling
Open the coupling handle and lift the
coupling head from the towball. When there
are higher nose loads, coupling and
uncoupling can be made easier by using the
jockey wheel.
Wear Indicator
A wear indicator on the coupling head (Fig.
15) shows whether the wear limit of the
towing vehicle’s towball or the trailer
coupling has been reached or not.
For this purpose, hitch up the trailer to the
towball and drive the unit for approx. 500 m.
This will set the coupling head adjustment.
Following this, check the wear indicator as
follows.
If the green indicator is visible on the
coupling (with the coupling engaged Fig. 15),
the coupling head is in good condition or the
wear on the towball is within permissible
limits.
When the green indicator on the coupling
handle is completely covered over and only
the red portion is visible (Fig. 15), this could
be caused by the following:
- The towball has reached the lowest wear
limit of 49.61 mm dia.
- Both coupling head and towball are
showing signs of wear.
154
Fig. 14
Fig. 15
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