Hitachi DV 16V, Technical Data And Service Manual

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7-3. Precautions on Usage

(1) Confirm the direction of bit rotation

The bit rotates clockwise (viewed from the rear)

by pushing the R-side of the push button.

The L-side of the push button is pushed to turn

the bit counterclockwise.   The       and      marks

are provided on the body.  (Fig. 1)

CAUTION

Be sure to rotate the bit clockwise when drilling

into concrete with a drill bit in the IMPACT mode.

Especially in the case of an impact drill equipped

with a keyless chuck, the drill chuck may loosen

easily or the chuck may come off the spindle if

the bit is rotated counterclockwise in the IMPACT

mode.  (Fig. 2)

(2) IMPACT to ROTATION changeover (Fig. 3)

Shift the change lever between the right and left

positions to switch easily between IMPACT

(rotation and impact ) and ROTATION (rotation

only), respectively.

To bore holes in hard materials such as concrete,

stone and tiles, shift the change lever to the right-

hand position (as indicated by the 

mark).

The drill bit operates by the combined actions of

impact and rotation.

Pushing button

Change lever

Fig. 1

Fig. 2

Fig. 3

To bore holes in metal, wood and plastic, shift the change lever to the left-hand position (as indicated by the

     mark).  The drill bit operates by rotational action only, as in the case of a conventional electric drill.

CAUTION

Do not use the impact drill in the IMPACT function if the material can be bored by rotation only.  Such

action will not only reduce drill efficiency but may also damage the drill tip.

Operating the impact drill with the change lever in mid-position may result in damage.  When

switching, make sure that you shift the change lever to the correct position.

IMPACT

ROTATION

L

R

R

L