Hitachi WR9DM2 - Manual (Page 21)

English
21
<WH9DM2> (EB9B)
These values may vary slightly, according to surrounding temperature and battery
characteristics.
12. 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 with 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.
13. Number of bolt tightened possible (WR12DM2, WR9DM2)
Please refer to the table below for the number of bolt tightened possible with one
charge.
<WR12DM2> (EB1220BL)
<WR9DM2> (EB9B)
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 protector, 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.
Bolt used No. of tightenings
15/32" × 1–3/4" (M12 × 45) High tension bolt Approx. 120
Screw used No. of tightenings
Wood screw 5/32" × 2"
Approx. 350
(Soft wood) (ш4 Ч 50)
Machine screw
Approx. 1130
5/16" × 5/8" (M8 × 16)
Bolt used No. of tightenings
15/32" × 1–3/4" (M12 × 45) High tension bolt Approx. 80