I have seen various owners manuals on ebay. Also do a Google search for them there are some free pdfs available for download. ..I know there is a parts manual for a 430 on therr I've used it before..also the 420 is the same machine from the black down..The serial number below the steering wheel gives you the info on the model year.There weren't a lot of changes on the 430,the biggest ones were which axles you have early versions have light duty axles,and they got heavier as they went on...this is important if your running duals and a loader together.