Precautions On Usage - Hitachi G 18SE3 Technical Data And Service Manual

7-3. Precautions on Usage

Never press the pushing button while the depressed-center wheel is rotating.
If the pushing button is pressed while the depressed-center wheel is rotating, the spindle will stop immediately.
In such a case, there is a danger that the wheel nut may be loosened so that the depressed-center wheel flies off
unexpectedly to cause possible serious injury.
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