I'm posting this question for an IFRC member who isn't comfortable with using a forum.

Here is the problem as described to me:

The member replaced his '59 power steering unit with a remanufactured unit. When at a stop and he turns wheels left and back to the middle or right and back to the middle there is a spot about in the center where he has no power steering. After turning past the "dead spot" he again has power steering. If the car is moving, even very slowly, there is no "dead spot". It has done this ever since he replaced the power steering unit a couple of years ago.

What could cause this, and how can it be fixed?

Thanks,

Jeff