Maintenance - Makita BTW070 Instruction Manual

• Any of the following conditions indicates damage to the
charger and/or battery cartridge. Ask your Makita
Authorized or Factory Service Center to check them.
1) The charging light does not flash (green) when the
battery charger is plugged into a power source.
2) The charging light does not light up or flash (red)
when the battery is inserted in the charger port.
3) Charging is not completed at even more than two
hours after red light comes ON at start of charging.
Refresh charging
• Refreshing adapter (optional accessory) can refresh an
inactive battery cartridge.
• Refresh charging should be done once a week.
• When you charge a new battery cartridge or a battery
cartridge that has not been used for a long time, it may
not accept a full charge. In this case, refresh charging
must be done. The battery cartridge may decrease the
tool performance, because the chemical substance of
the battery cartridge is inactive.
Checking the remaining battery capacity (Fig. 3)
When charging
When the charging begins, the first (far left) indicator
lamp begins to flicker. Then, as charging proceeds, the
other lamps light, one after the other, to indicate the bat-
tery capacity.
When using
When the tool is switched on, the lamps will light to indi-
cate the remaining battery capacity. When the tool is
switched off, the light goes out automatically.
If the battery has not been used for a long time, or is
needed refresh charging, the (C) lamp begins to flicker.
Use Makita refreshing adapter to refresh the battery.
Installing or removing socket (Fig. 4)
CAUTION:
Always be sure that the tool is switched off and the bat-
tery cartridge is removed before installing or removing
the socket.
To install the socket, push it onto the anvil of the tool until
it locks into place. To remove the socket, simply pull it off.
Switch action (Fig. 5)
CAUTION:
Before inserting the battery cartridge into the tool, always
check to see that the switch trigger actuates properly and
returns to the "OFF" position when released.
To start the tool, simply pull the trigger. Tool speed is
increased by increasing pressure on the trigger. Release
the trigger to stop.
Reversing switch action (Fig. 6)
CAUTION:
• Always check the direction of rotation before operation.
• Use the reversing switch only after the tool comes to a
complete stop. Changing the direction of rotation
before the tool stops may damage the tool.
• When not operating the tool, always set the reversing
switch lever to the neutral position.
This tool has a reversing switch to change the direction of
rotation. Depress the reversing switch lever from the A
side for clockwise rotation or from the B side for counter-
clockwise rotation. When the reversing switch lever is in
the neutral position, the switch trigger cannot be pulled.
6
Auto-stop mechanism (Fig. 7)
The tool stops automatically after the battery capacity
reaches under 20% to prevent the lack of fastening
torque. (Red color lamp lights on.) Charge the battery or
use a new fully charged one.
Operation
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. 8 for stan-
dard bolt or Fig. 9 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.
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.
CAUTION:
If the tool is operated continuously until the battery car-
tridge has discharged, allow the tool to rest for 15 min-
utes before proceeding with a fresh battery.

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. 10 & 11)
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.