I have never used site before (so nothing cached) - and I see NO guest login. Indeed, it states:
AGCO Parts Books is the source of Parts Catalog information for AGCO Dealers and Customers.
If you are not a registered user and are interested in using AGCO Parts Books website then please do one of the following:
-existing Customers please contact your AGCO Dealership to request a login to the website. Then you may enter the Dealer-supplied login on this page.
-new Customers please locate your nearest AGCO Dealership to request a login. You may use our Dealer Locator function to assist in that process.
This suggests that "Guest" access is no longer permitted.
As an aside, I also see:
Warning: In order to use this site you need to install Adobe's SVG Viewer first.
What's that all about - requiring users to install an obsolete and unsupported, probably buggy, piece of software?
J