Power Steering Belt

Good pics.
I vuagley remember having to loosen an adjusting nut which was between the pump housing and bracket, using a thin wrench,
Then loosening the other nuts so the unit pivoted...
That was many years ago.
I don't have power steering around to see, maybe another member can weigh in.
If your set up doesn't have ANY way to loosen or adjust, you can carefully "bump" a smaller sized belt over the pulley by CAREFULLY cranking. Just make sure to pull the coil wire so it doesn't start and grab you.