Maintenance - Makita 6914D Instruction Manual

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. Driver bit or socket bit
Failure to use the correct size driver bit or socket bit
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 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 machine or the material
of driving position to be fastened will affect the
torque.
5. Operating the machine at low speed will cause a
reduction in the fastening torque.
6

MAINTENANCE

CAUTION:
Always be sure that the machine is switched off and the
battery cartridge is removed before carrying out any work
on the machine.
Replacement of carbon brushes (Fig. 9 & 10)
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.
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.
• Screw bits
• Bit-piece
• Stopper
• Various type of Makita genuine batteries and chargers
• Plastic carrying case