Fix Position of gameobject.

I am working on application where i want to change position of game object in x direction using local position.

here is my code

IEnumerator Load Product(string product, Game Object parent, Vector3 position, Vector3 rotation)

 {        

Game Object go = Instantiate (Resources.Load (product)) as Game Object;

go.tag = "application";

go.transform.parent =parent.transform;

go.transform.localPosition = new Vector3(0,0,0);

go.transform.localRotation =Quaternion.Euler(rotation);

currentProduct = parent;

}

StartCoroutine(LoadProduct(product, pokethru, new Vector3(0,0,0), new Vector3(-26, -44, 21)));

I want to change position of game object towards x axis.i have tried many things.but if I Change x axis only the game object will rotate .I want fix position of game object..

I am new for unity.any help will be appreciated.