power steering noise

[paparude]

hi all,

got an 95 svs AWD and lately when o turn the wheel hard all the way to the left or right the power steering make a squeaking noise and the "metal wheel" that comes out of the pump and has the belt on it it stops spinning.....

i checked the O-ring...looks OK....i don't have any leaks fron the pump....or under the car...

anyboby experienced this before?..any ideas...?

i'm very new in this field and i feel i have to explain it in chineeseeee

thank u