Whenever I start up the combine I turn off the radio and anything else that will make noise just to listen to everything running to listen for squeaks, rattling chains, or anything that sounds like it's falling apart. "Feeling" things wrong is also a little harder in the newer equipment. I can also hear that a bearing is going on something on my 225 Magnum that I need to replace sooner rather than later. So yes the younger guys know when something sounds wrong. :) | 
Is "listening" to your equipment a lost art?
