Rotation Only" (No Striking) - Hitachi DH 20PB Technical Data And Service Manual

8-4. "Rotation Only" (no striking)

Turn the change lever fully clockwise to the "drill" mark position to obtain "Rotation Only" function. To use the tool
for drilling or driving screws, the chuck adapter and a drill chuck (optional accessories) must be used. In older
models such as the Models DH 22 and DH 22V, when the chuck adapter is mounted the second hammer moves
forward, the striker slips out of striking position to open up an air vent and stop striking operation and "Rotation
Only" operation is automatically obtained. However, since the Models DH 24PA and DH 24PB are equipped with
a change lever for changeover between "Rotation + Striking" and "Rotation Only" functions, merely mounting the
chuck adapter will not stop the striking action; it is absolutely necessary to turn the change lever to the "Rotation
Only" setting for drilling or driving screws. Should the change lever be set to the "Rotation + Striking" position
when the tool is used for drilling, the striking action may cause the drill chuck to be broken or damaged. Sales
personnel should carefully ensure that the buyer is thoroughly advised on this point.
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