Volvo S40 Owner's Manual page 150

NOTE
Check that the towball section is secure by
pulling it up, down and back. If the towball
section is not fitted correctly then it must be
removed and refitted in accordance with
the previous steps.
IMPORTANT
Only grease in the towball for the towing
hitch, the remainder of the towball section
should be clean and dry.
NOTE
The trailer's safety cable must be secured in
the towing bracket's mounting eye.
06 Starting and driving
Detachable towbar
06
149