Volvo 2007 S80 Owner's Manual page 168

Removing the towball
1
Insert the key and turn it clockwise to the
unlocked position.
2
Push in the locking wheel and turn it
anticlockwise until you hear a click.
3
Turn the locking wheel down fully, until it
comes to a stop. Hold it in this position
while pulling the towball rearward and
upward.
4
Insert the guard plug.
05 During your journey
Driving with a trailer
05
167