Steering a little rough

This has been happening for about two days now.When I turn,at idle or to a max. of 15 mph,the steering wheel gets kinda stiff and requires more effort to turn (at higher speeds,its ok.).The strange thing is,that it only gets kinda stiff when im making a normal or a sharp turn to the left.When I turn to the right,its quite simple.Any ideas?

Ive replaced the power steering fluid already,and checked for leaks.

May be time for a new rack.

I went to the mechanic and he said that was it.Thanks for the info.