The other guys have brought up some good points, here are a few more, we also run a 410. If the machine has done soybeans, check for stone damage to the cylinder bars and concaves. Check to see if the metal strips in the sieves are loose, not hard to change but expensive. Our hydraulic oil pump leaked, changed seals, but still leaked, so ended up replacing it. That was expensive, but oil collects dust, less expensive than an engine fire. Ours has the gas engine, it had a crack in the exhaust manifold. Check that the straw walkers are straight. like the other fellow said, look for cracks, they tend to grow, I once saw a 410 that was almost split in half at the back. They tend to be hit in the back, its a blind spot. If so, make sure that the body isn't warped so bad that the grain pan isn't sealing against the side of the body. I've noticed that machines in wrecking yards often are missing the gearbox that drives the cylinder, I would check for play there. Ours has some, I don't know how much is normal.Where are you locatedIJ We bought our 410 at an auction, it came with a 44 corn head that we have never used, its taking up room in the shed. I am in south west Ontario, Canada.Good luck, Freddy