Bedienungsanleitung Hitachi WH18DDL (Seite 13 von 76) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Portugiesisch, Spanisch)

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NOTE:

⅜ The appropriate mode differs depending on the screw

and the material being screwed. Drive in a few test

screws and adjust the mode setting accordingly.

⅜ The tightening mode selector switch can only be set

after the battery has been installed in the driver and

the trigger switch has been pulled once.

7. Tightening and loosening screws

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.

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 tool 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.

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 metal parts, 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. 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.

4. 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.

5. Holding the tool

Hold the tool firmly with both hands. In this case hold

the tool in line with the screw or bolt.

It is not necessary to push the tool very hard. Hold

the tool with a force just sufficient to counteract the

impact force.

6. 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.

(3) Diameter of bolt

The tightening torque differs with the diameter of the

bolt. 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.

(5) Tightening torque varies, depending on the battery’s

charge level.

Examples of tightening mode selector function settings

Low Medium High S mode

Rotation speed

3000 min

-1

3000 min

-1

900 min

-1

2200 min

-1

/3100 min

-1

/3100 min

-1

Use

“Delicate work”

Tightening small

diameter screws

(M6 or similar), etc.

“Light load work”

Affixing plasterboard

etc.

Self drilling screw

tightening

“Heavy load work”

Tightening long

screws, coach

screws, bolts, etc.

01Eng_WH14DDL_WE 12/11/12, 13:3813

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