Engine height adjustment headlamps

Hello guys, I hope one can help and give me tips. Just drove home in the dark and the left headlight lights up in the sky. At home in the garage I had to find out that the engine of the height adjustment is constantly buzzing and trying to adjust the headlight. Is there a trick? Is it hung out? I got on it once – but did not help anything. Light out and the hum is, of course, gone… I think the engine won’t survive for a long time… Does anyone have an idea?