John Deere 200 & 900 Series Cutting Platforms, 40 & 90 Series Corn Heads, 50 & 50A Series Row Crop Heads Technical Manual - TM1581
John Deere 200 & 900 Series Cutting Platforms, 40 & 90 Series Corn Heads, 50 & 50A Series Row Crop Heads Technical Manual - TM1581