Not to be a wet blanket, but your probably going to be hearing from Kubota about this. For one, you used "Kubota" in your URL for a site that could be confused with some affiliation with Kubota corporate. I recomend you add a statement on the home page that your not, and setup a link to Kubota.com.
You also spelled out that your looking for copyright free content... but everything that posted there is copyrighted. It may not say so in the .pdf files, but that content was ripped from an early version of our dealer parts programs which contains a copyright in the EULA. I know you have good intentions, but it defentialy has the potential to raise some eyebrows.