Maintenance; Replacing Carbon Brushes - Makita BTW200 Instruction Manual

Standard bolt
N.m
(ft.lbs)
M16X50 (5/8" X 2") at high speed
140
(101)
120
(87)
100
(72)
80
M16X50 (5/8" X 2") at low speed
(58)
60
(43)
M12X50 (1/2" X 2") at high speed
40
M12X50 (1/2" X 2") at low speed
(29)
20 M10X50 (3/8" X 2") at low speed
(14)
M10X50 (3/8" X 2") at high speed
0 1 2
Fastening time
High tensile bolt
N.m
260
(188)
240
(174)
220
M16X50 (5/8" X 2") at high speed
(159)
200
(145)
180
(130)
160
(116)
140
(101)
120
(87)
100
(72)
80
M12X50 (1/2" X 2") at low speed
(58)
60
(43)
M10X50 (3/8" X 2") at low speed
40
(29)
20
M10X50 (3/8" X 2") at high speed
(14)
0 1 2 3 4
Fastening time
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.
• Excessive fastening torque may damage the bolt/
nut or socket. Before starting your job, always per-
form a test operation to determine the proper fas-
tening time for your bolt or nut.
• 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.
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.
M16 (5/8")
M12 (1/2")
M10 (3/8")
3 (S)
M16 (5/8")
M12X50 (1/2" X 2") at high speed
M16X50 (5/8" X 2") at low speed
M12 (1/2")
M10 (3/8")
5 6 (S)
2. Socket
002369
• 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
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
002370
wrench. Compensate by fastening for a longer
period of time.
5. The manner of holding the tool or the material of
driving position to be fastened will affect the torque.
6. 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.
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.
8
001145
1. Limit mark
1