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
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. Type of materials to be fastened, the manner of
holding the machine and the machine speed will
affect the torque.
Fastening performance
The following reference table indicates the approximate fastening capacity from a single battery charge. It may
differ under some conditions.
Application
Fastening time
Number of fastenings
6911HDA
6911HDB
High tensile bolt M12
3 seconds
About 90
About 100
CAUTION:
If the machine is operated continuously until the battery cartridge has discharged, allow the machine to rest for
15 minutes before proceeding with a fresh battery.
Installing set plate (Fig. 9)
Always install the set plate when using battery cartridges 1200, 1202 or 1202A. Install the set plate on the tool
with the screw provided as shown in figure.
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.
To maintain product safety and reliability, repairs,
maintenance or adjustment should be carried out by
Makita Authorized Service Center.
GUARANTEE
We guarantee Makita machines in accordance with
statutory/country-specific regulations. Damage attrib-
utable to normal wear and tear, overload or improper
handling will be excluded from the guarantee. In case
of complaint, please send the machine, undismantled,
with the enclosed GUARANTEE CERTIFICATE, to
your dealer or the Makita Service Center.
6911HDA/6911HDWA (Eng) (’98. 12. 18)
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