Take along some tools. Open up those gear boxes--if they have oil standing in them, good. If they have grease, they probably won't hold oil. I have noticed that the upside-down "c" beam between the axles tends to develop stress cracks near the base of the elevator. That's not a dealbreaker, but the picker has probably run over a lot of washouts and will need welded. Rubber picker fingers are expensive to replace, but most pickers need them at some point. Use a crowbar to turn the pto shaft. If it turns easily, make sure that everything is moving as it should. If something is not moving (the elevator, for instance), then it is probably missing a drive gear or "bicycle" chain. Again, not a dealbreaker, but it will need fixed. There are some gear-driven systems on the 324--if those don't turn when the pto shaft turns, then the picker has a problem you might not want to tackle. If the pto shaft does not turn, it is probably a frozen rusty chain, which is no big deal. If you can, take along someone who knows a bit about the picker to help you find any other problems. I have found replacement chains (both drag chains and drive chains) fairly easily. I have made paddles for both the elevator and the gathering unit. You will have trouble finding drive gears--they are either expensive or no longer made, depending on the gear. You will have to find them at a scrap yard, or else buy a parts picker. Many parts off of New Idea mounted pickers are compatible with the pull-type pickers. Check the adjustment on the chains--if all the slack has been taken out, then the chain is probably well worn. Prices for used pickers vary widely depending on geography--know your region.