Volvo V70 Owner's Manual page 112

Mounting the ball section
1. Remove the guard plug.
IMG-204180
2. Ensure that the mechanism is in the
unlocked position by turning the key
clockwise.
Detachable towbar – mounting the ball section
IMG-20418
3. Check that the indicator window (3) shows
red.
If the window does not show red, press in
(1) and turn the locking wheel anticlockwise
(2) until there is an audible click.
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