Makita DTW251Z Manual De Instrucciones página 7

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. The manner of holding the tool or the material of
driving position to be fastened will affect the torque.
6. 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.
• Never use gasoline, benzine, thinner, alcohol or the
like. Discoloration, deformation or cracks may result.
To maintain product SAFETY and RELIABILITY, repairs,
carbon brush inspection and replacement, any other
maintenance or adjustment should be performed by
Makita Authorized or Factory Service Centers, always
using Makita replacement parts.
OPTIONAL 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.
• Sockets
• Extension bar
• Universal joint
• Bit adapter
• Various type of Makita genuine batteries and chargers
NOTE:
• Some items in the list may be included in the tool pack-
age as standard accessories. They may differ from
country to country.
Noise
The typical A-weighted noise level determined according
to EN62841-2-2:
Model DTW250
Sound pressure level (L
Sound power level (L
Uncertainty (K): 3 dB (A)
Model DTW251
Sound pressure level (L
Sound power level (L
Uncertainty (K): 3 dB (A)
NOTE:
• The declared noise emission value(s) has been mea-
sured in accordance with a standard test method and
may be used for comparing one tool with another.
• The declared noise emission value(s) may also be
used in a preliminary assessment of exposure.
WARNING:
• Wear ear protection.
• The noise emission during actual use of the power tool
can differ from the declared value(s) depending on the
ways in which the tool is used especially what kind of
workpiece is processed.
• Be sure to identify safety measures to protect the oper-
ator that are based on an estimation of exposure in the
actual conditions of use (taking account of all parts of
the operating cycle such as the times when the tool is
switched off and when it is running idle in addition to
the trigger time).
Vibration
The vibration total value (tri-axial vector sum) determined
according to EN62841-2-2:
Model DTW250
Work mode: impact tightening of fasteners of the
maximum capacity of the tool
Vibration emission (a
Uncertainty (K): 1.5 m/s
Model DTW251
Work mode: impact tightening of fasteners of the
maximum capacity of the tool
Vibration emission (a
Uncertainty (K): 1.5 m/s
NOTE:
• The declared vibration total value(s) has been mea-
sured in accordance with a standard test method and
may be used for comparing one tool with another.
• The declared vibration total value(s) may also be used
in a preliminary assessment of exposure.
WARNING:
• The vibration emission during actual use of the power
tool can differ from the declared value(s) depending on
the ways in which the tool is used especially what kind
of workpiece is processed.
• Be sure to identify safety measures to protect the oper-
ator that are based on an estimation of exposure in the
actual conditions of use (taking account of all parts of
the operating cycle such as the times when the tool is
switched off and when it is running idle in addition to
the trigger time).
EC DECLARATION OF CONFORMITY
For European countries only
The EC declaration of conformity is included as Annex A
to this instruction manual.
ENG905-1
): 90 dB (A)
pA
): 101 dB (A)
WA
): 94 dB (A)
pA
): 105 dB (A)
WA
ENG907-1
ENG900-1
2
): 14.5 m/s
h
2
2
): 11.0 m/s
h
2
ENG901-2
7