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NOTE
A buzzing noise is produced when the motor is about to rotate; this is only a noise, not
a machine failure.
8. Tightening and loosening bolts
A hex socket matching the bolt or nut must first be selected. Then mount the socket on
the anvil, and grip the nut to be tightened with the hex socket. Holding the wrench in
line with the bolt, press the power switch to impact the nut for several seconds.
If the nut is only loosely fitted to the bolt, the bolt may turn wit the nut, therefore
mistaking proper tightening. In this case, stop impact on the nut and hold the bolt head
with a wrench before restarting impact, or manually tighten the bolt and nut to prevent
them slipping.
9. Number of bolt tightened possible
Please refer to the table below for the number of bolt tightened possible with one
charge.
5/8" × 2–5/32" (M16 × 55) F10T bolt
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. 16 for the tightening torque of bolts (according to size), under the conditions
shown in Fig. 17. Please use this example as a general reference, as tightening torque
will vary according to tightening conditions.
Tightening torque varies, depending on the battery's charge level. Fig. 18 shows an
example of the relationship between tightening torque and the number of tightenings.
As shown, tightening torque gradually weakens with the increase in the number of
tightenings. In particular, as the torque decreases very close to the complete discharge
("a" margin in graph), the unit's impact weakens, the number of time impacts declines
and tightening torque drops off abruptly. If this occurs, check torque level, then recharge
the battery if necessary.
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.
18
Bolt used
No. of tightenings
Approx. 84
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