Notes on installing a trailer hitch - AH31.10-P-1000-02FF
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MODEL 210
The following applies for Germany:
The installed trailer coupling must be submitted to an officially-appointed expert for the purpose of inspection and approval. Foreign countries must observe the appropriate registration regulations or legal requirements for the installation of a trailer coupling.
On all areas in which the trailer hitch comes into contact with the body, the body sealing compound and the underbody coating are to be removed. The mounting points should then be cleaned with a commercially available cleaning agent. Apply anticorrosion paint to bare-metal areas of the body.
Trailer hitches are homologated safety-related parts. They must be installed on vehicles by a specialist. Trailer couplings, which have been damaged in an accident, by bottoming or through an impact from behind, must be replaced; subsequent modifications such as bending, machining, welding etc. are not permitted.
The coupling ball must have a minimum diameter of 49 mm at all points, measured using a caliper gauge. The ball must be greased before use to reduce wear. Advise the customer accordingly. Otherwise safety will be compromised.
The customer should be asked to read the chapters entitled "trailer hitch" and "Trailer operation" in the vehicle's operating instructions.
For model 210.025/225 with A/C (code 580) or Automatic air conditioning (code 581) a transmission cooler with blower motor and a blower motor have to be retrofitted for the engine oil cooler. With code 228 Stationary heater the stationary heater must be installed in the engine compartment (see installation instructions for stationary heater)
In the event that the above-mentioned components are not retrofitted, this will render the warranty/goodwill null and void.
Courtesy of MERCEDES-BENZ USA
The customer must be advised that fuse 12 in the rear fuse box (F4) may only be inserted when driving with a trailer attached - otherwise another electrical device could discharge the battery while the vehicle is at a standstill.