Maintenance - Makita 6911HD Instruction Manual

Hold the tool firmly and place the socket over the bot or nut. Turn the tool on and
fasten for the proper fastening time.
NOTE :
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Hold the tool pointed straight a t the bolt or nut without applying excessive pressure on
the tool.
*Excessive fastening torque may damage the bolt or nut. Before starting your job, always
perform a t e s t operation to verify the adequate fastening speed and time for your bolt
or nut.
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 i s discharged almost completely, voltage will drop and
2. Socket
the fastening torque will be reduced.
*Failure t o 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
*Even though the diameters of bolts are the same, the proper fastening torque will
fastening torque will differ according t o the diameter of the bolt.
differ according t o the torque coefficient, the class of bolt and the bolt length.
4. The use of 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 type of materials t o be fastened, the manner of holding the tool and the tool
CAUTION :
If the
tool is operated continuously until the battery cartridge has discharged, allow the
tool to rest for 15 minutes before proceeding with a fresh battery.
speed will affect the torque.
MAINTENANCE
CAUTION:
Always be sure that the tool is switched off and the battery cartridge is removed
before attempting t o perform inspection or maintenance.
To maintain product SAFETY and RELIABILITY, repairs, maintenance or adjustment
should be performed by Makita Authorized or Factory Service Centers, always using
Makita replacement parts.
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