W reg ka - should I still have power steering after a new rack?

I have just had a new power steering rack on my W reg ford ka, now before I had it fitted I had power steering but now I don't - two people have tried it and said it feels fine but to me it is not the same at all if anything it is worse. I have to turn my steering wheel alot more than I had to before. Is this suppose to happen as it is driving me mad???