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Makita BFT121F Manual

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7
Adjusting the fastening torque
Fig.7
Use an optional adjust grip to adjust the fastening torque.
Insert the pins of the adjust grip into the holes in the front
of the tool. And then, turn the adjust grip so that the
torque gauge shows the desired torque by one of the
numbers from 5 to 12. The number provides
approximate fastening torque in Newton-meter (N•m).
After completion of the adjustment, always make trial
fastening about twenty times in order to keep stability of
torque. Then, check the fastening torque with a torque
tester before starting operation.
ASSEMBLY
CAUTION:
• Always be sure that the tool is switched off and the
battery cartridge is removed before carrying out
any work on the tool.
Installing or removing the bit
Fig.8
Use only the driver bit or socket bit shown in the figure.
Do not use any other driver bit or socket bit.
To install the bit, pull the sleeve in the direction of the
arrow and insert the bit into the sleeve as far as it will go.
Then release the sleeve to secure the bit.
Fig.9
To remove the bit, pull the sleeve in the direction of the
arrow and pull the bit out.
OPERATION
Screwdriving operation
Fig.10
Place the point of the driver bit in the screw head and
apply pressure to the tool. Then switch the tool on.
When the clutch cuts in, the motor will stop automatically.
Then release the switch trigger.
NOTE:
• Make sure that the driver bit is inserted straight in
the screw head, or the screw and/or bit may be
damaged.
Limits of fastening capacity
Use the tool within the limits of fastening capacity. If you
use the tool beyond the limits, the clutch does not work.
And the tool cannot deliver enough fastening torque.
0
60
120
180
240
300
360
5 6 7 8 9 10 11 12
Torque N
.
m
Revolution angle (¡)
Capacity limit of BFT120(F)
003819
0
60
120
180
240
300
360
5 6 7 8 9 10 11 12
Torque N
.
m
Capacity limit of BFT121F
Revolution angle (¡)
003820
NOTE:
• The revolution angle means the angle which a
screw/bolt revolves when the tool attains to 100%
from 50% of desired torque.
• Use of a low temparature conditioned battery
cartridge may sometimes give warning for battery
cartridge capacity by LED indicator and beeper
which makes the tool stop immediately. In this case,
the range of fastening capacity may be inferior to
those shown in the above even if a charged battery
cartridge is used.
MAINTENANCE
CAUTION:
• Always be sure that the tool is switched off and the
battery cartridge is removed before attempting to
perform inspection or maintenance.
Replacing carbon brushes
Fig.11
Remove and check the carbon brushes regularly.
Replace when they wear down to the limit mark. Keep
the carbon brushes clean and free to slip in the holders.
Both carbon brushes should be replaced at the same
time. Use only identical carbon brushes.
Use a screwdriver to remove the brush holder caps.
Take out the worn carbon brushes, insert the new ones
and secure the brush holder caps.
Fig.12
To maintain product SAFETY and RELIABILITY, repairs,
any other maintenance or adjustment should be
performed by Makita Authorized Service Centers,
always using Makita replacement parts.
… 7 …


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