Are you using the factory bolt or a hardware store bolt. Bolts are different grades strating at grade 2 and progressing up. Each grade up means the bolt is stronger. go to this website to see the grades and strengths of the bolts. http://www.boltdepot.com/fastener-infor ... Chart.aspxVivian":2c3uzmkx said:The bolt that connects the pitman arm to the cutterbar keeps breaking. What could be the reason?