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I just purchased my first crawler, here are a few time saving tips that worked for me, The guys that are advising you obviously have decades of experience, I find their vast depth of knowlege overwhelming, like anything if they are used to it, it's as easy as a good golf swing, Dont get me wrong the experienced guys are unbeatable, but for first timers, I can speak to that language... here we go.. (Experts, please excuse my simplistic approach and correct me if I am wrong, I don't want to mislead or OVER simplify) ... 1) go to a dealer who has used equipment and get him to show you what a BAD under carriage looks like, study the look of the pins, grooved rollers etc. he will explain the various pieces and you will then by process of elimination know what BAD looks like, what NOT to buy and therefore also what GOOD should generally look like. 2) once you know what bad looks like, your eyes are the best guide, The pins should be round, wear will be simply reflected in the roundness, check the surfaces of the rollers to see if they are grooved or not. 3) move the machine, make sure all the rollers and idlers are turning. My theory is that these items are the leading indicators that can highlight many related problems, at least it's the practise I used. Get the experienced guys to guide you through the rail wear checks and sprocket stuff, take a micrometer and use it. Mike
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