Maintenance - Makita BTW200 Instruction Manual

– High tensile bolt –
CAUTION:
• Always insert the battery cartridge all the way until it
locks in place. If you can see the red part on the
upper side of the button, it is not locked completely.
Insert it fully until the red part cannot be seen. If not,
it may accidentally fall out of the tool, causing injury
to you or someone around you.
• When operating overhead, make sure the battery
cartridge is locked securely so that it will not be
fallen out of the tool. If not, it may accidentally fall
out of the tool, causing injury to you or someone
around you.
Hold the tool firmly and place the socket over the bolt
or nut. Turn the tool on and fasten for the proper
fastening time.
NOTE:
• Hold the tool pointed straight at 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 test
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 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.
8
M16 x 50 at high speed
M12 x 50 at
high speed
M16 x 50 at low speed
M12 x 50 at low speed
M10 x 50 at low speed
M10 x 50 at high speed
Fastening time
Proper fastening torque for M16
Proper fastening torque for M12
Proper fastening torque for M10
Seconds
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 tool and the tool speed will affect the
torque.
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.

MAINTENANCE

CAUTION:
Always be sure that the tool is switched off and the
battery cartridge is removed before carrying out any
work on the tool.
Replacement of carbon brushes (Fig. 8 & 9)
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,
maintenance or adjustment should be carried out by a
Makita Authorized Service Center.