Maintenance; Replacing Carbon Brushes - Makita 6935FD Instruction Manual

For Model 6980FD
Hightensile bolt
.
N m
(ft.lbs)
80
(58)
60
(43)
M8(5/16")
40
(29)
20
(14)
0
1.0 2.0
Fastening time
For 6935FD
.
N m High tensile bolt
(ft.lbs)
M12(1/2")
120
(86)
100
(72)
80
(58)
60
(43)
M8(5/16")
40
(29)
20
(14)
0 1.0 2.0
Fastening time
Hold the tool firmly and place the point of the driver bit in
the screw head. Apply forward pressure to the tool to the
extent that the bit will not slip off the screw and turn the
tool on to start operation.
NOTE:
• Use the proper bit for the head of the screw/bolt
that you wish to use.
• When fastening screw M8 or smaller, carefully
adjust pressure on the switch trigger so that the
screw is not damaged.
• Hold the tool pointed straight at the screw.
• If you tighten the screw for a time longer than
shown in the figures, the screw or the point of the
driver bit may be overstressed, stripped, damaged,
etc. Before starting your job, always perform a test
004998
M10(3/8")
M10(3/8")
M8(5/16")
3.0
005000
M12(1/2")
M10(3/8")
M10(3/8")
M8(5/16")
3.0
operation to determine the proper fastening time for
your screw.
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. Driver bit or socket bit
Failure to use the correct size driver bit or socket bit
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
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 manner of holding the tool or the material of
driving position to be fastened will affect the torque.
5. Operating the tool at low speed will cause a reduc-
tion in the fastening torque.

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

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.
8
001145
1. Limit mark
1