Bedienungsanleitung Hitachi wh 14 dsl (Seite 53 von 60) (Englisch, Dänisch, Schwedisch, Norwegisch, Finnisch)

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OPERATIONAL CAUTIONS

1. Resting the unit after continuous work

(1) The power tool is equipped with a temperature

protection circuit to protect the motor. (WH18DSL)

Continuous bolt-tightening work may cause the

temperature of the unit to rise, activating the

temperature protection circuit and automatically

stopping operation.

If this happens, allow the power tool to cool before

resuming use.

(2) 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 Fig. 16, 17 and 18 for the tightening torque of

bolts (according to size). 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. 16, 17 and 18)

(3) Diameter of bolt

The tightening torque differs with the diameter of the

bolt as shown in Fig. 16, 17 and 18. 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.

05Eng_WH14DSL_NE 11/14/08, 18:2052

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