Manual Hitachi WR 12 DAF (page 12 of 90) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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(2) Switching the hook position

CAUTION:

Incomplete installation of the hook may result in

bodily injury when used.

(a) Securely hold the main unit and remove the screw

using a slotted head screwdriver or a coin (Fig. 9).

(b) Remove the hook and spring (Fig. 10).

securely fasten with screw (Fig. 11).

NOTE:

Pay attention to the spring orientation. Install the

spring with larger diameter away from you (Fig. 11).

(3) Using the bit holder

⅜ Installing the bit

Slide the bit from the side in the direction of Fig.

12, and then insert firmly until the groove on the

bit locks in the protruded section of the hook.

⅜ Removing the bit

Securely hold the main unit and pull out the bit by

holding the tip with your thumb (Fig. 13).

CAUTION:

⅜ The socket may come loose from the hook and cause

bodily injury when reversing the direction of the bit

as shown in Fig. 12 or when using the wrench with

the bit stored incomplete.

⅜ Only Hitachi OPTIONAL ACCESSORIES plus driver bits

(Bit No. 2; Code No. 992671, Bit No. 3; Code No.

992672) may be used. Do not use other bits since they

may come loose.

2. Check the rotational direction

The socket 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. 14) (The

and

marks

are provided on the body.).

CAUTION

The push button can not be switched while the impact

wrench is turning. To switch the push button, stop

the impact wrench, 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.

For WR12DAF (EB1220BL)

These values may vary slightly, according to

surrounding temperature and battery characteristics.

NOTE

The use of the battery EB1226HL 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 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 tightening in bolts, the components of

the electronic circuit parts may overheat and be

damaged.

3. Tightening torque

Refer to Fig. 15 for the tightening torque of bolts

(according to size), under the conditions shown in Fig.

16. Please use this example as a general reference,

as tightening torque will vary according to tightening

conditions.

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.

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.

Bolt used No. of tightenings

High tension bolt

Approx. 170

M12 × 45

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Hitachi WR 12 DAF Manual

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