My whirlpool washer always gos off balance during the spin cycle. Why?

You have a broken spring or the support hole has rusted out, or a weight has broken. Remove the back and take a look. You will be able to see what's wrong right away. Here are the manuals: https://dl.dropbox.com/u/8010163/Und...c%20washer.pdf
https://dl.dropbox.com/u/8010163/Whi...%20washers.zip
https://dl.dropbox.com/u/8010163/Whi...%20Washers.zip