Maintenance - Makita BTW072 Betriebsanleitung

Confirming the presetting
Switch off the tool and insert the battery cartridge. The indicating lamp will indicate the presetting number.
Green lamp shows the first digit. Red lamp shows the second digit.
Example: Presetting number is 12.
Green color lamp flashes once.
Relation between presetting number and action
Presetting
number
00
After impacting [number of impacts
(presetting number x 2) x 0.02] seconds
Green color lamp lights on.
Switch off before impacting [number of
01 – 99
impacts(presetting number x 2) x 0.02] sec-
onds
Red color lamp lights on. Then,the lamp will
go out.
Indicating lamp
• After impacting preset numbers, the indicating lamp
lights in green color.
• The red color light will light on if the trigger is pulled
before the presetting number of impacts is achieved. It
indicates that the operation is incomplete.
Operation
[*1] Presetting number of impacts is impossible for more
than 200 impacts (4 seconds).
[*2] Fastening time includes when you pull the trigger
completely.
The proper fastening torque may differ depending upon
the kind or size of the bolt. The relation between fasten-
ing torque and fastening time is shown in Fig. 11 for stan-
dard bolt or Fig. 12 for high tensile bolt.
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 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.
Red color lamp flashes two times.
Clockwise rotation
Auto-stop setting does not work.
The lamp goes out.
Counterclockwise rotation
Auto-stop setting does not work.
Auto-stop setting does not work. Indication
lamp goes out.
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 hold-
ing the tool and the tool speed will affect the torque.

MAINTENANCE

CAUTION:
Always be sure that the tool is switched off and the bat-
tery cartridge is removed before carrying out any work on
the tool.
Replacement of carbon brushes (Fig. 13 & 14)
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.
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