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You should have one replacement helmet every three years. The best way to keep your chainsaw safe is to use a chain brake and an extension bar when cutting branches.
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The life of the chain saws varies from 5 to 7 years. This means that if you have a 3-year old chain saw, it's probably not going to last very long. If you are worried about this, consider buying a new one. But if you do that, don't forget to upgrade to a brand new model.
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At least once a month, but typically every two months.
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