When i turn the steering

It could be the pump, or you could also be low on power steering fluid. First off, check the level of the fluid and make sure it's adequate. Next, you can "burp" the power steering system easily, which will get rid of any air bubbles that could be in there. Easiest way is to jack the front end off the ground (both wheels), start the engine, take off the power steering fluid reservoir cap, and turn the wheel side to side as far as it'll go, several times. This circulates the fluid through the system and pushes any bubbles in there up to the reservoir, where they'll float up to the top and "burp" into the air.

If neither of those things works, you may have problems with the steering rack and pinion, or possibly with your suspension (check the tie rods, inner and outer, as well as the bushings in the various suspension pieces).