We bought one new in "96 with the 6900 splitter for beans. You cannot beat White"s seed meter for simplicity and accuracy. Depth control not an issue either. Work well in no-till, with heavy down pressure springs and cast closing wheels.
When looking at it, check to see how much the closing arm holes are worn. If you can move the closing unit side to side, the arms will have to be replaced. You can now easily update them to the current design.
Also remove seed disk and check tickler and air cutoff brushes.
Check bushing wear on row unit parallel arms, and of course check bearings on openers ect.
Overall, very dependable and accurate planter. I assume you either have closed center hyd"s with a case drain, or will run a PTO pump to power the orbit motor?