Agitator top half don't turn.

Top half of agitator don’t turn. If I push down on it, it works like it is suppose to. Is it the agitator that is at fault?

Sounds like these little suckers here, an easy and inexpensive repair, and here is avideo that will show you how.

http://www.youtube.com/watch?v=0GQh8JLqVv8