Makita 6934FD Manuale di istruzioni - Pagina 6

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OPERATION

The proper fastening torque may differ depending upon

the kind or size of the screw/bolt, the material of the

workpiece to be fastened, etc. The relation between fas-

tening torque and fastening time is shown in the figures.

(Fig. 6 & 7)

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

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

time.

NOTE:

• When fastening screw M8 (5/16") or smaller, carefully

adjust pressure on the switch trigger so that the screw

is not damaged.

• Hold the tool pointed straight at the bolt or nut.

• Excessive fastening torque may damage the bolt/nut or

socket. Before starting your job, always perform a test

operation to determine the proper fastening time for

your bolt or nut. Especially for the bolt smaller than M8

(5/16"), perform the above test operation to prevent the

trouble on socket or bolt, etc.

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

tors including the following. After fastening, always check

the torque with a torque wrench.

When the battery cartridge is discharged almost

completely, voltage will drop and the fastening

torque will be reduced.

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.

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 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.

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.

The manner of holding the tool or the material of

driving position to be fastened will affect the torque.

Operating the tool at low speed will cause a reduc-

tion in the fastening torque.

MAINTENANCE

CAUTION:

• Always be sure that the tool is switched off and the bat-

tery cartridge is removed before attempting to perform

inspection or maintenance.

Replacing carbon brushes (Fig. 8 & 9)

Remove and check the carbon brushes regularly.

Replace when they wear down to the limit mark. Keep

the carbon brushes clean and free to slip in the holders.

Both carbon brushes should be replaced at the same

time. Use only identical carbon brushes.

Use a screwdriver to remove the brush holder caps. Take

out the worn carbon brushes, insert the new ones and

secure the brush holder caps.

After replacing brushes, insert the battery cartridge into

the tool and break in brushes by running tool with no load

for about 1 minute. Then check the tool while running and

electric brake operation when releasing the switch trig-

ger. If electric brake is not working well, ask your local

Makita service center for repair.

To maintain product SAFETY and RELIABILITY, repairs,

any other maintenance or adjustment should be per-

formed by Makita Authorized Service Centers, always

using Makita replacement parts.

ACCESSORIES

CAUTION:

• These accessories or attachments are recommended

for use with your Makita tool specified in this manual.

The use of any other accessories or attachments might

present a risk of injury to persons. Only use accessory

or attachment for its stated purpose.

If you need any assistance for more details regarding

these accessories, ask your local Makita service center.

• Various type of Makita genuine batteries and chargers