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WEAR INDICATOR
A wear indicator on the coupling head (Fig 34) shows
whether the wear limit of the towing vehicle’s towball or the
trailer coupling has been reached. 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 34), 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 34), this could be caused by the following:
- Towball has reached the lowest wear limit of 49.61mm dia.
- Both coupling head and towball are showing signs of wear.
- Towball is in good condition with 50mm dia, but the
coupling head is showing an excessive level of wear.
CAUTION
Under these circumstances, the coupling head can become
detached from the towball and the caravan/trailer can break
away from the tow vehicle. The coupling head and towball must
therefore be checked IMMEDIATELY before future use. Any faulty
parts must be changed IMMEDIATELY.
All maintenance work should be carried out by AL-KO
Approved Workshops.
Fig 34 Wear indicator
COUPLING TYPES AK160 & AK300
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