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High-pitched whine when triger pressed???


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Hi, I purchased few secondhand  tools recently and have an issue especially with jigsaw and DC727 drill.

Tools have an annoying high-pitched whine when the trigger is first pulled under no load. The sound lessens as RPMs increase but the squeal of this drill is really obnoxious.

Is it normal? 

I own DCD710 and it doesn't have that sound. Had many other tools and never had this problem.

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