Manual Hitachi wr 14 dsl (page 14 of 96) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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7. How to use the LED light

Every time you press the light switch on the switch

panel, the LED light lights or goes off. (Fig. 14)

To prevent the battery power consumption, turn off

the LED light frequently.

CAUTION:

⅜ Do not expose directly your eye to the light by looking

into the light.

If your eye is continuously exposed to the light, your

eye will be hurt.

NOTE:

⅜ To prevent the battery power consumption caused

by forgetting to turn off the LED light, the light goes

off automatically in about 15 minutes.

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 Fig. 19 for the tightening torque of bolts

(according to size), under the conditions shown in

Fig. 20. 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. 19)

(3) Diameter of bolt

The tightening torque differs with the diameter of the

bolt as shown in Fig. 19. 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) Using optional parts

The tightening torque is reduced a little when an

extension bar, universal joint or a long socket is

used.

(6) Clearance of the socket

A worn or deformed hex. or a square-holed socket

will not give an adequate tightness to the fitting

between the nut or anvil, consequently resulting in

loss of tightening torque.

Using an improper socket which does not match to

the bolt will result in an insufficient tightening torque.

Matching socket and bolt sizes are shown in Table 1

and 2.

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

charge level.

Fig. 21 show examples of the relationship between

tightening torque and the number of tightenings, for

WR14DSL. As shown, tightening torque gradually

weakens with the increase in the number of

tightenings. In particular, as the torque decreases

very close to the complete discharge (“a” margin in

graph), the unit’s impact weakens, the number of

time impacts declines and tightening torque drops

off abruptly. If this occurs, check torque level, then

recharge the battery if necessary.

01Eng_WR14DSL_WE 6/19/08, 17:5013

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Hitachi wr 14 dsl Manual

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