Hitachi WR12DM2, WR9DM2, WH12DM2, WH9DM2 Operational Cautions, Tightening and loosening bolts

English

<WH9DM2> (EB9B)

Screw used	No. of tightenings
Wood screw 5/32" ⋅ 2"	Approx. 350
(Soft wood) (ø4 ⋅ 50)
Machine screw	Approx. 1130
5/16" ⋅ 5/8" (M8 ⋅ 16)

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)

Bolt used	No. of tightenings
15/32" ⋅ 1–3/4" (M12 ⋅ 45) High tension bolt	Approx. 120
<WR9DM2> (EB9B)
Bolt used	No. of tightenings
15/32" ⋅ 1–3/4" (M12 ⋅ 45) High tension bolt	Approx. 80

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.

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