Bedienungsanleitung Makita BTW121 (Seite 7 von 80) (Deutsch, Englisch, Holländisch, Dänisch, Französisch, Italienisch, Portugiesisch, Spanisch, Schwedisch, Norwegisch, Finnisch)

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Dial setting and function (Fig. 7)

Bolt fastening

Temporary bolt fastening and loosening

By using the B or C on the left dial in combination with one of the digits (from 0 to 9) on the right-hand dial, you can do

temporary bolt fastening or bolt loosening.

Operation (Fig. 8 & 9)

[*1] Presetting number of impacts is impossible for more

than 200 impacts (4 seconds).

[*2] Fastening time includes when you pull the trigger

completely.

CAUTION:

• Hold the tool firmly and place the socket over the bolt or

nut. Turn the tool on and fasten for the proper fastening

time and number of impacts (dial setting).

• Always insert the battery cartridge all the way until it

locks in place. If you can see the red part on the upper

side of the button, it is not locked completely. Insert it

fully until the red part cannot be seen. If not, it may

accidentally fall out of the tool, causing injury to you or

someone around you.

• If the tool is operated continuously until the battery car-

tridge has discharged, allow the tool to rest for 15 min-

utes before proceeding with a fresh battery.

The proper fastening torque may differ depending upon

the kind or size of the bolt. the material of the workpiece

to be fastened, etc. The relation between fastening

torque, fastening time and number of the impacts (dial

setting) is shown in the figures.

NOTE:

• Hold the tool pointed straight at the bolt or nut without

applying excessive pressure on the tool.

• When fastening screw M8 or smaller, carefully adjust

pressure on the switch trigger so that the screw is not

damaged.

• Excessive fastening torque may damage the bolt or

nut. Before starting your job, always perform a test

operation to verify the adequate fastening speed, time

and number of impacts (dial setting) for your bolt or nut.

Especially for the bolt other than M8, perform the above

test operation to prevent the trouble on socket or bolt,

etc.

The fastening torque is affected by a wide variety of fac-

tors including the following. After fastening, always check

the torque with a torque wrench.

1. When the battery cartridge is discharged almost

completely, voltage will drop and the fastening

torque will be reduced.

2. Socket

• Failure to use the correct size socket will cause a

reduction in the fastening torque.

• A worn socket (wear on the hex end or square

end) will cause a reduction in the fastening torque.

3. Bolt

• Even though the torque coefficient and the class of

bolt are the same, the proper fastening torque will

differ according to the diameter of the bolt.

• Even though the diameters of bolts are the same,

the proper fastening torque will differ according to

the torque coefficient, the class of bolt and the bolt

length.

4. The use of the universal joint or the extension bar

somewhat reduces the fastening force of the impact

wrench. Compensate by fastening for a longer

period of time.

5. Type of materials to be fastened, the manner of hold-

ing the tool and the tool speed will affect the torque.

Dial setting Clockwise Counterclockwise Application

01 – 98

Tool stops after the twice

the set number of impacts

is reached. See the next

section for the appropriate

fastening torque.

Pull the trigger to start the

tool; release it to stop.

Bolt fastening while con-

trolling the number of

impacts.

Pull the trigger to start the tool; release it to stop. Bolt fastening without con-

trolling the number of

impacts; or when fasten-

ing with more than 200

impacts (over 4 sec.)

No rotation even with trig-

ger pulled.

Pull the trigger to start the

tool; release it to stop.

—

Dial setting Clockwise Counterclockwise Application

B [*]

Select dial 0 – 9 for B [*]

After catching the first

impact, tool stops [*] x0.1

seconds later.

Pull the trigger to start the

tool; release it to stop.

For temporary bolt fastening.

C [*]

Select dial 0 – 9 for C [*]

Pull the trigger to start the

tool; release it to stop.

After stopping to impact,

tool stops [*] x0.1 seconds

later.

To loosen bolts.

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