If your saw still has the original bar and chain, it was supplied with a .325" pitch chain and you'll need a 3/8" round file with a sharpening guide to properly sharpen it.
Here's a link to the Husqvarna site to the Rancher 455 models so you can select the correct manual to download, that matches your particular saw, based on the year of manufacture, etc.
There is some excellent information about maintaining your saw, along with a really good guide with step-by-step instructions for proper sharpening.
http://www.husqvarna.com/us/homeowner/support/download-manuals/?query=455&types=O
If you're having trouble figuring out the right manual for your saw, use the online Customer Support page and they'll reply.
Hope you find this Very Helpful - Best regards!
We figured it out thank-you!!
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