Handleiding Hitachi wr14dm (pagina 49 van 54) (Engels, Deens, Zweeds, Noors, Fins)

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Bolt used No. of tightenings

M16 × 55 (F10T) Approx. 126

(4) Replacing the batteries

(a) Loosen the hook screw with a phillips-head

screwdriver (No. 1) (Fig. 12).

Remove the hook cover by pushing in the

direction of the arrow (Fig. 13).

(b) Remove the old batteries and insert the new

batteries. Align with the hook indications and

position the plus (+) and minus (–) terminals

correctly (Fig. 14).

with the protuberance of the hook cover, press

the hook cover in the direction opposite to that

of the arrow shown in Fig. 13 and then tighten

the screw.

Use commercially available AAAA batteries

(1.5 V).

NOTE

Do not tighten the screw excessively. Such action

could strip the screw threads.

CAUTION

⅜ Failure to observe the following can result in battery

leakage, rust or malfunction.

Position the plus (+) and minus (–) terminals correctly.

Replace both batteries at the same time. Do not mix

old and new batteries.

Remove exhausted batteries from the hook

immediately.

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. 15) (The

and

marks are engraved 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 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 wrench 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 wit 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.

5. Number of bolt tightened possible

Please refer to the table below for the number of

bolt tightened possible with one charge.

EB1430H

These values may vary slightly, according to

surrounding temperature and battery characteristics.

NOTE

The use of the battery EB1430H in a cold condition

(below 0°C) 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 hammer case, 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. 20 for the tightening torque of bolts

(according to size), under the conditions shown in

Fig. 21. Please use this example as a general

reference, as tightening torque will vary according

to tightening conditions.

Tightening torque varies, depending on the battery’s

charge level. Fig. 22 shows an example of the

relationship between tightening torque and the

number of tightenings, for WR14DM. 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.

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 proportionate to the operaton

time. Use the correct operating time for the bolt.

5. 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.

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