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Message: <blockquote data-quote="spitzair" data-source="post: 136883" data-attributes="member: 3333">That sound and vibration is most likely your u-joint between the engine and hydraulic pump about to fail. DO NOT START YOUR ENGINE until you have checked that u-joint because if it does let go completely it WILL do considerable damage! Like Brdgbldr says this is one of the most neglected maintenance items, it needs to be greased every 100 hrs or so, most don't do it because it's a bit of a pain to get to. My suggestion is to pull the engine out and replace the u-joint assembly, pulling the engine on these machines is not a major undertaking. All you do is undo the coolant lines, some fuel lines and your throttle linkage, a bit of electrical, the intake and exhaust pipes, pull the 4 bolts that hold the engine subframe to the main frame of the machine and the whole thing comes out. On my 732 I can have the engine out in less than an hour, your 743B will be similar, the biggest difference will be you have a Kubota diesel engine. Once you have the engine out the u-joint will be easily accessible on the flywheel, I'm willing to bet it is shot.</blockquote>