Bedienungsanleitung Hitachi wh12dm2 (Seite 67 von 74) (Englisch, Dänisch, Schwedisch, Norwegisch, Finnisch)

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⅜ Do not discard batteries together with normal trash

and do not throw batteries into fire.

⅜ Store batteries out of the reach of children.

⅜ Use batteries correctly in accordance with the battery

specifications and indications.

2. Check the rotational direction

The bit rotates clockwise (viewed from the rear side)

by pushing the R-side of the push button.

The L-side of the push button is pushed to turn the bit

counterclockwise. (See Fig. 18) (The

and

marks

are provided on the body.)

CAUTION:

The push button can not be switched while the impact

driver is turning. To switch the push button, stop the

impact driver, then set the push button.

3. Switch operation

⅜ When the trigger switch is depressed, the tool rotates.

When the trigger is released, the tool stops.

⅜ The rotational speed can be controlled by varying the

amount that the trigger switch is pulled. Speed is low

when the trigger switch is pulled slightly and increases

as the trigger switch is pulled more.

4. Tightening and loosening screws

(WH12DM2, WH9DM2)

Install the bit that matches the screw, line up the bit

in the grooves of the head of the screw, then tighten

it.

Push the impact driver just enough to keep the bit

fitting the head of the screw.

CAUTION:

Applying the impact driver for too long tightens the

screw too much and can break it.

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.

5. Number of screws tightenings possible

(WH12DM2, WH9DM2)

Please refer to the table below for the number of

screw tightened possible with one charge.

For WH12DM2 (EB1230HL)

For 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.

For WR12DM2 (EB1230HL)

Screw used No. of tightenings

Wood screw ø4 × 50

Approx. 790

(Soft wood)

Machine screw M8 × 16 Approx. 1750

Bolt used No. of tightenings

M12 High tension bolt Approx. 180

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. 120

For 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

the electronic circuit parts may overheat and be

damaged.

3. Tightening torque

Refer to Figs. 23, 24, 25 and 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 operation time. Use

the correct operating time for the bolt.

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