Bedienungsanleitung Makita BFT121F (Seite 7 von 60) (Deutsch, Englisch, Polnisch)

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Adjusting the fastening torque

Fig.7

Use an optional adjust grip to adjust the fastening torque.

Insert the pins of the adjust grip into the holes in the front

of the tool. And then, turn the adjust grip so that the

torque gauge shows the desired torque by one of the

numbers from 5 to 12. The number provides

approximate fastening torque in Newton-meter (N•m).

After completion of the adjustment, always make trial

fastening about twenty times in order to keep stability of

torque. Then, check the fastening torque with a torque

tester before starting operation.

ASSEMBLY

CAUTION:

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

battery cartridge is removed before carrying out

any work on the tool.

Installing or removing the bit

Fig.8

Use only the driver bit or socket bit shown in the figure.

Do not use any other driver bit or socket bit.

To install the bit, pull the sleeve in the direction of the

arrow and insert the bit into the sleeve as far as it will go.

Then release the sleeve to secure the bit.

Fig.9

To remove the bit, pull the sleeve in the direction of the

arrow and pull the bit out.

OPERATION

Screwdriving operation

Fig.10

Place the point of the driver bit in the screw head and

apply pressure to the tool. Then switch the tool on.

When the clutch cuts in, the motor will stop automatically.

Then release the switch trigger.

NOTE:

• Make sure that the driver bit is inserted straight in

the screw head, or the screw and/or bit may be

damaged.

Limits of fastening capacity

Use the tool within the limits of fastening capacity. If you

use the tool beyond the limits, the clutch does not work.

And the tool cannot deliver enough fastening torque.

120

180

240

300

360

5 6 7 8 9 10 11 12

Torque N

Revolution angle (¡)

Capacity limit of BFT120(F)

003819

120

180

240

300

360

5 6 7 8 9 10 11 12

Torque N

Capacity limit of BFT121F

Revolution angle (¡)

003820

NOTE:

• The revolution angle means the angle which a

screw/bolt revolves when the tool attains to 100%

from 50% of desired torque.

• Use of a low temparature conditioned battery

cartridge may sometimes give warning for battery

cartridge capacity by LED indicator and beeper

which makes the tool stop immediately. In this case,

the range of fastening capacity may be inferior to

those shown in the above even if a charged battery

cartridge is used.

MAINTENANCE

CAUTION:

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

battery cartridge is removed before attempting to

perform inspection or maintenance.

Replacing carbon brushes

Fig.11

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.

Fig.12

To maintain product SAFETY and RELIABILITY, repairs,

any other maintenance or adjustment should be

performed by Makita Authorized Service Centers,

always using Makita replacement parts.

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