The sad thing is that now days replacing a part is often the only way to diagnose, and hopefully fix a problem. I know in the equipment world, Komatsu in particular, often has a step in the troubleshooting flowchart that will get you to a point and then say, "Replace with known good part". From there it goes back into the troubleshooting by asking whether the problem went away or not, and what to do next if it didn't.
In these cases, as well as others, the OEM doesn't give any kind of guide, or even specifications, to check certain critical parts, changing them is often necessary because there's no way to really know whether the part is good or not.
That said, I HATE BEING FORCED TO FIX ANYTHING LIKE THAT. I much rather being able to find an actual problem, and THEN change a part if needed, not just change a part and hope it fixes the problem....and then change another if it doesn't.
In the end I was always taught the greatest computer was the one between your ears. Once you learn to use it, it's not that hard to troubleshoot a problem and get if fixed. Unfortunately too many technicians', NOT mechanics, now days let the digital computer do the work and forget that they need to use their brain.
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Today's Featured Article - Identifying Tractor Smells - by Curtis Von Fange. We are continuing our series on learning to talk the language of our tractor. Since we can’t actually talk to our tractors, though some of the older sect of farmers might disagree, we use our five physical senses to observe and construe what our iron age friends are trying to tell us. We have already talked about some of the colors the unit might leave as clues to its well-being. Now we are going to use our noses to diagnose particular smells. ELECTRICAL SMELLS
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