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How Often Should I Change My Chainsaw Bar

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A chainsaw bar should be replaced when the teeth in it have worn down to a length in which they cannot cut wood in a single pass. If the chainsaw bar in a chainsaw is not replaced when it's worn out, then the chainsaw will not cut through wood, which means the operator will not be able to complete the cutting job that he or she has set out to do.
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The best approach is to use a sharp chain that�s sized for the cutting job in hand. It is a good idea to do a maintenance check on the chain saw every time you refuel. Loosen the chain by two or three quarter turns and apply a few drops of Vaseline on the outside of the chain. Run the saw for a few minutes and if the chain starts to become hot, stop and apply a few drops of bar and chain oil. You will need to do this for about three minutes. Then allow the chain to cool, and then tighten the bar. Cutting through hardwood can dull a chain in a matter of minutes. It might feel a little slow, but the chain life is considerably prolonged.
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Probably not as often as the makers of the bar would have you use them. The gauge of the bar is a guide, but not a hard rule. I run a 20" bar on my 36" chainsaw. The bar is around 3-4 years old and still going strong. If I feel the bar is getting a bit dull, while I'm working on a limb, I'll take a file and put a quick edge on it. I never clean the bar, I just run it. The more you use a bar, the faster it will dull. You'll have to use a file on the other side, too.
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