Hi Ademir: the replaceing of the altenator on the craftsman lawnmower you have will require some specility tools and quite a bit of mechanical ability on your part. But if you really want to undertake the task yourself, you can get a detailed diagram from a website called partsandservice.com
Hope this is of help to you
Mickey-G, November 2008
What engine is fitted, and what makes you think the the alternator is faulty? It's not a common fault.