Operational Cautions - Hitachi WH 8DH Manual De Instrucciones

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6. Tightening and loosening screws
Install the bit that matches the screw, line up the bit in the grooves of the head of the
screw, then tighten it.
Push the impact driver just enough to keep the bit fitting the head of the screw.
CAUTION
Applying the impact driver for too long tightens the screw too much and can break it.
Tightening a screw with the impact driver at an angle to that screw can damage the head
of the screw and the proper force will not be transmitted to the screw.
Tighten with this impact driver lined up straight with the screw.
7. Number of screw tightenings possible (with one charge (EB9B))
Please refer to the table below for the number of screw tightenings possible with one
charge.
Screw used
Wood screw #7 × 2"
(Soft wood) (ø4.0 × 50)
Machine screw
5/16" x 5/8" (M8 × 16)
These values may vary slightly, according to surrounding temperature and battery
characteristics.

OPERATIONAL CAUTIONS

1. Cautions on use of the speed control switch
This switch has a built-in, electronic circuit which infinitely varies the rotation speed.
Consequently, when the switch trigger is pulled only slightly (low speed rotation) and the
motor is stopped while continuously driving in screws, the components of the electronic
circuit parts may overheat and be damaged.
2. Tightening torque
Refer to Fig. 7, 8 and 9 for the tightening torque of bolts (according to size), under the
conditions shown in Fig. 10. Please use this example as a general reference, as tightening
torque will vary according to tightening conditions.
NOTE
If a long striking time is used, screws will be strongly tightened. This may cause the screw
to break, or may damage the end of the bit.
If the unit is held at an angle to the screw being tightened, the head of the screw may be
damaged, or the specified torque may not be transmitted to the screw. Always keep the
unit and the screw being tightened in a straight line.
3. Use a tightening time suitable for the screw
The appropriate torque for a screw differs according to the material and size of the screw,
and the material being screwed etc., so please use a tightening time suitable for the
screw. In particular, if a long tightening time is used in the case of screws smaller than
5/16" (8 mm), there is a danger of the screw breaking, so please confirm the tightening
time and the tightening torque beforehand.
16
No. of tightenings
Approx. 300
Approx. 1120