Manual Hitachi WH 12 DMR (page 15 of 130) (English)

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5. Number of screws tightenings possible (WH12DM2,

WH9DM2, WH12DMR)

Please refer to the table below for the number of

screw tightened possible with one charge.

WH12DM2, WH12DMR (EB1230HL)

WH9DM2 (EB930H)

These values may vary slightly, according to

surrounding temperature and battery characteristics.

6. Number of bolt tightened possible (WR12DM2,

WR9DM2)

Please refer to the table below for the number of bolt

tightened possible with one charge.

WR12DM2 (EB1230HL)

WR9DM2 (EB930H)

These values may vary slightly, according to

surrounding temperature and battery characteristics.

NOTE:

The use of the battery EB1230HL, EB930H in a cold

condition (below 0 degree Centigrade) can sometimes

result in the weakened tightening torque and reduced

amount of work. This, however, is a temporary

phenomenon, and returns to normal when the battery

warms up.

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.

NOTE:

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

Screw used No. of tightenings

Wood screw ø4 × 50

Approx. 530

(Soft wood)

Machine screw M8 × 16 Approx. 1690

Bolt used No. of tightenings

M12 Hightension bolt Approx. 180

Bolt used No. of tightenings

M12 Hightension bolt Approx. 120

the electronic circuit parts may overheat and be

damaged.

3. Tightening torque

Refer to Fig. 22, 23, 24, 25 and Fig. 26 for the tightening

torque of bolts (according to size), under the

conditions shown in Fig. 27. 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 tip 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.

4. Use a tightening time suitable for the screw

The appropriate torque for a screw differs according

to the material and size of the screw, and the material

being screwed etc., so please use a tightening time

suitable for the screw. In particular, if a long tightening

time is used in the case of screws smaller than M8,

there is a danger of the screw breaking, so please

confirm the tightening time and the tightening torque

beforehand.

5. Work at a tightening torque suitable for the bolt

under impact

The optimum tightening torque for nuts or bolts differs

with material and size of the nuts or bolts. An

excessively large tightening torque for a small bolt

may stretch or break the bolt. The tightening torque

increases in proportion to the operaton time. Use the

correct operating time for the bolt.

6. Holding the tool

Hold the impact wrench firmly with both hands. In

this case hold the wrench in line with the bolt.

It is not necessary to push the wrench very hard.

Hold the wrench with a force just sufficient to

counteract the impact force.

7. Confirm the tightening torque

The following factors contribute to a reduction of the

tightening torque. So confirm the actual tightening

torque needed by screwing up some bolts before the

job with a hand torque wrench. Factors affecting the

tightening torque are as follows.

(1) Voltage

When the discharge margin is reached, voltage

decreases and tightening torque is lowered.

(2) Operating time

The tightening torque increases when the operating

time increases. But the tightening torque does not

increase above a certain value even if the tool is

driven for a long time. (See Fig. 22, 23, 24, 25 and 26)

(3) Diameter of bolt

The tightening torque differs with the diameter of the

bolt as shown in Fig. 22, 23, 24, 25 and 26. Generally a

larger diameter bolt requires larger tightening torque.

(4) Tightening conditions

The tightening torque differs according to the torque

ratio; class, and length of bolts even when bolts with

the same size threads are used. The tightening torque

also differs according to the condition of the surface

of workpiece through which the bolts are to be

tightened. When the bolt and nut turn together, torque

is greatly reduced.

Screw used

No. of tightenings

WH12DM2 WH12DMR

Wood screw ø4 × 50

Approx. 790 Approx. 750

(Soft wood)

Machine screw M8 × 16

Approx. 1750 Approx. 1660

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Hitachi WH 12 DMR Manual

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