Operational Cautions - Hitachi WH12DAF2 - 12V Cordless 1/4" Impact Driver Safety And Instruction Manual

6. Switch operation
When the trigger switch is depressed, the tool rotates. When the trigger is released, the
tool stops.
The rotational speed can be controlled by varying the amount that the trigger switch is
pulled. Speed is low when the trigger switch is pulled slightly and increases as the
trigger switch is pulled more.
NOTE: A buzzing noise is produced when the motor is about to rotate; this is only a noise,
not a machine failure.
7. 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.
8. Number of screw tightenings possible
Please refer to the table below for the number of screw tightenings possible with one
charge.
<WH12DAF2> (EB1214S)
Screw used
Wood screw 5/32"
(Soft wood) (ø4
Machine screw
5/16" x 5/8" (M8
These values may vary slightly, according to surrounding temperature and battery
characteristics.

OPERATIONAL CAUTIONS

1. Resting the unit after continuous work
After use for continuous bolt-tightening work, rest the unit for 15 minutes or so when
replacing the battery. The temperature of the motor, switch, etc., will rise if the work is
started again immediately after battery replacement, eventually resulting in burnout.
CAUTION:
Do not touch the hammer case, as it gets very hot during continuous work.
2"
50)
16)
No. of tightenings
Appro. 190
Appro. 500
English
17