Maintenance of KitchenAid Tilt Head Mixer
The beaters position can be adjusted with a HK 20 (twenty) cents coin which thickness is approx equal to that of an American dime. The steps are explained in the video below.
How to Adjust the Beaters on a KitchenAid Tilt Head Mixer
The use and care of KitchenAid Tilt Head Mixer can be found on following link 
Hinge Pin Adjustment