When coupling an implement using automatic quick-attach hooks (Schnellkuppler / Fanghaken) on the lower links, how do you verify secure locking?

1. Check that the lift arms raise the implement with the top link removed
2. Visually check that the locking pawls (Verriegelungsklinken) have closed fully over the ball ends and the release indicators show locked
3. Confirm the implement can still rock sideways on the ball ends
4. Raise and lower the linkage twice and listen for the pawls