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Message: <blockquote data-quote="Tazza" data-source="post: 59597" data-attributes="member: 82">I don't believe the 743B has a gear box, it is just a motor carrier.As you have had the motor checked and the pump too, it has to be a chain or sprocket. Remove the inspection cover, jack it up and move the wheels so you can check every part of the chain and sprockets. The hear ones will be hard to see though.I had a chain once that one of the rollers had opened up, no idea how. I got my torch, heated it and closed it back up. It may be something as simple as this. Only one roller out of 20 odd feet of chain.</blockquote>