Manual Makita BTW151 (page 7 of 64) (English, German, Dutch, Danish, French, Italian, Portuguese, Swedish, Spanish, Norwegian, Finnish)

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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.

Dial setting Clockwise Counterclockwise Application

B [*]

Select dial 0 − 9 for B [*]

After catching the first

impact, tool stops [*] x 0.1

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 [*] x 0.1 seconds later.

To loosen bolts.

Operation

CAUTION:

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 arround you.

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 and

fastening time is shown in Fig. 8 for standard bolt or Fig. 9 for

high tensile bolt. Hold the tool firmly and place the socket over

the bolt or nut. Turn the tool on and fasten for the proper

fastening time.

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

200 impacts (4 seconds).

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

pletely.

NOTE:

•

When fastening screw M8 or smaller, carefully adjust pres-

sure on the switch trigger so that the screw is not damaged.

•

Hold the tool pointed straight at the bolt.

•

If you fasten the bolt for a time longer than shown in the

figure, the bolt or the socket may be overstressed, dam-

aged, etc. Before starting your job, always perform a test

operation to determine the proper fastening time for your

bolt. 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 factors

including the following. After fastening, always check the

torque with a torque wrench.

1. When the battery cartridge is discharged almost com-

pletely, 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 manner of holding the tool or the material of driving

position to be fastened will affect the torque.

5. Operating the tool at low speed will cause a reduction in

the fastening torque.

MAINTENANCE

CAUTION:

Always be sure that the tool is switched off and the battery

cartridge is removed before carrying out any work on the tool.

Replacement of carbon brushes (Fig. 10 & 11)

Replace carbon brushes when they are worn down to the limit

mark. Both identical carbon brushes should be replaced at the

same time.

To maintain product safety and reliability, repairs, mainte-

nance or adjustment should be carried out by a Makita

Authorized Service Center.

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Makita BTW151 Manual

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