Switches can also cause a decrease of tool power when they have suffered heat damage but not shorted out completely.īetween these cases, a decrease in tool power is more likely to be caused by the brushes. This makes diagnosis difficult at first, but a switch acting like this will quickly get worse by reducing the power performance of the tool even more, making it easier to pin down the cause as time goes on. Sometimes this decrease in power happens without warning signals like off-and-on use. The gradual wear of power switches can sometimes cause a decrease in power that reaches the tool's motor. Wearing or damaged brushes can cause a similar off-and-on use problem, but this is usually because wear, damage, or a "burr" formation is preventing the carbon brush from correctly contacting the armature's commutator. Wearing power switches will cause off-and-on use as their connections wear down, sometimes requiring several pulls of the trigger before the tool starts up. When they first start to go out, switches and carbon brushes can present either (or both) of the following two symptoms : Similar Symptoms Beginning symptoms of wear or malfunction can look the same for both carbon brushes and power switches.
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Tool and machine users everywhere can save themselves some extra cash and valuable time when they know what to look for and how to set it fix it on their own. Fortunately, carbon brush replacements and power switch replacements are two of the easiest tool repairs. The steps and descriptions below will help to quickly pin down the cause of the malfunction.
We address the issues of carbon brush and power switch breakdowns separately because they are very common part replacements, and because it can be especially difficult to tell which one is the cause of the malfunction.
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Because both brush and power switch failures are common-and because both breakdowns present similar symptoms-diagnosing between them when symptoms present can be tricky.įor a full "Diagnosing Electric Power Tools" article-Click here. Power switch assemblies and carbon brushes are two of the most commonly-replaced power tool parts.
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