The body sealing compound and underbody sealant must be removed from all the body mounting points of the trailer coupling. The mounting points should then be cleaned with a commercially available cleaning agent. Apply anticorrosion paint to bare-metal areas of the body.
Trailer couplings are approved safety-related parts. They must be installed on vehicles by a specialist. Trailer couplings which have been damaged in an accident, by bottoming or by an impact from behind must be replaced; subsequent modifications such as bending, machining, welding, etc. are not permitted.
The coupling ball must have a ball diameter of at least 49 mm at all points measured with a caliper gageIf this is not the case the coupling ball must be replaced for a new one. The ball must be greased before use to reduce wear.
The micro-encapsulated locking bolts and self-locking nuts may only be used once. If parts of the trailer coupling are removed, new micro-encapsulated bolts and self-locking nuts must be used when reinstalling these parts.
On trailers with an anti-swerve device it is not necessary to grease the ball (refer to trailer instructions). Please inform the customer of this.
Advise the customer to read the “Trailer coupling” and “Towing a trailer” sections in the vehicle owner’s manual
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