English

CAUTION

Never change the direction of bit rotation while operating. Turn the power switch OFF before changing the direction of bit rotation: otherwise, burning of the motor will result.

Always use the hammer drill with clockwise rotation, when using it as an hammer drill. (Fig. 10)

Reversing switch lever

 

Fig. 9

HOW TO USE

Fig. 10

 

CAUTION:

To prevent accidents, make sure to turn the switch off and disconnect the plug from the receptacle when the drill bits and other various parts are installed or removed. The power switch should also be turned off during a work break and after work.

1. Operation of switch

The drill speed can be adjusted from O through full speed by regulating the trigger- squeezing force. The more the trigger is squeezed, the faster the drill rotates. When the trigger is squeezed fully, the speed is the maximum.

Pulling the trigger and pushig the stopper, it keeps the switched-on condition which is convenient for continuous running. When switching off, the stopper can be disconnected by pulling the trigger again.

2.When using as a Drill or a Hammer Drill

(1) Pressing force of the drill

You cannot drill holes more quickly even if you press the drill with a stronger force than necessary. It not only damages tip of drill bits and decreases the efficiency of operation, but also shortens the life of the drill.

(2) In case of penetrating holes

Drill bits can be broken when the material being drilled is penetrated. It is important to decrease pressing force just before penetrating.

CAUTION

In continuous operation, conduct no-load operation for five seconds after completing a drilling job.

(3)When a thick drill bit is used

Your arm is subjected to larger reaction force when a thicker drill bit is used. Be careful not to be moved by the reaction force. For this, establish a foothold, hodl the unit tightly with both hands perpendicularly to the material being drilled.

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Hitachi DV 20VB instruction manual HOW to USE, Operation of switch, When using as a Drill or a Hammer Drill