Hitachi DV14DMR - Manual (Page 25)

English
25
CAUTION:
● Do not use the Cordlless hammer drill in the "Hammer" setting if the material can be
bored by rotation only. Such action will not only reduce drill efficiency, but may also
damage the drill tip.
11. Tightening torque adjustment
(1) Tightening torque
Tightening torque should correspond in its intensity to the screw diameter. When too
strong power is used, the screw head may be broken or be injured.
Be sure to adjust the cap position according to the screw diameter.
(2) Tightening torque indication (See Fig. 23)
The tightening torque differs depending on the type of screw and the material being
tightened.
The unit indicates the tightening torque with the numbers “1, 4, 7 ... 22” on the cap, and
a black dot. The tightening torque at position “1” is the weakest and the torque is
strongest at the highest number.
(3) Adjusting the tightening torque (See Fig. 23)
Rotate the cap and line up the numbers “1, 4, 7 ... 22” on the cap, or the black dot, with
the triangle mark on the outer body. Adjust the cap in the weak or the strong torque
direction according to the torque you need.
CAUTION:
● The motor rotation may be locked to cease while the unit is used as drill. While operating
the driver drill, take care not to lock the motor.
● When setting the shift knob to “HIGH” (high speed) and the position of the cap is
between “16” and “22”, it may happen that the clutch does not engaged and that the
motor is locked. In such a case, please set the shift knob to “LOW” (low speed).
● If the motor is locked, immediately turn the power off. If the motor is locked for a
while, the motor or battery may be burnt.
● Too long hammering may cause the screw broken due to excessive tightening.
● A buzzing noise is produced when the motor is about to rotate; this is only a noise, not
a machine failure.
12. For drilling into brick
CAUTION:
● When the Cordlless hammer drill is used continuously, the body may be heated. If this
happens, leave the Cordlless hammer drill to cool.
● Excessive pressing force never increases drilling speed. It will not only damage the
drill tip or reduce working efficiency, but could also shorten the service life of drill bit.
Operate Cordlless hammer drill within 20 – 30 lbs. (10 – 15 kg) pressing force while
drilling into brick.