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CAUTION
ⅷ Applying the impact driver for too long tightens the screw too much and can break it.
ⅷ 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.
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. Cautions on use of the speed control switch
This switch has a built-in, electronic circuit which steplessly 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.
3. Tightening torque
Refer to Fig. 15 for the tightening torque of bolts (according to size), under the conditions
shown in Fig. 16. Please use this example as a general reference, as tightening torque
will vary according to tightening conditions.
NOTE
⅜ 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.
⅜ 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.
Screw used No. of tightenings
Wood screw 5/32" × 2"
Appro. 630
(Soft wood) (ø4 × 50)
Machine screw
Appro. 1260
5/16" x 5/8" (M8 × 16)