5
OPERATION
The proper fastening torque may differ depending upon
the kind or size of the bolt, the material of the workpiece
to be fastened, etc. The relation between fastening
torque and fastening time is shown in the figures.
0
0.5
1
1.5
2
2.5
50
100
150
200
250
300
Standard bolt
Fastening torque (N m)
Fastening time (S)
.
M12X80
(3/4"X3-1/8")
(5/8"X3-1/8")
(1/2"X3-1/8")
3
M16X80
M20X80
004009
0
1
2
3
4
5
50
100
150
200
250
300
M16
M16(F10T)
High tensile bolt
Fastening torque (N m)
Fastening time (S)
(5/8")
(5/8")
(1/2"X3-1/8")
(1/2")
.
M12X80
M12
6
004010
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:
•
When fastening screw M12 or smaller, carefully
adjust pressure on the switch so that the screw is
not damaged.
•
Hold the tool pointed straight at the bolt or nut
without applying excessive pressure on the tool.
•
If you fasten the bolt for a time longer than shown in
the figures, the bolt or the socket may be
overstressed, damaged, etc. Before starting your job,
always perform a test operation to determine the
proper fastening time for your bolt. Especially for the
bolt over than M12, perform the above test operation
to prevent the trouble on socket or bolt, etc.
The fastening torque is affected by a wide variety of
factors including the following. After fastening, always
check the torque with a torque wrench.
1. Voltage
•
Voltage drop will cause a reduction in the
fastening torque.
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 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.
The manner of holding the tool or the material of
driving position to be fastened will affect the
torque.
MAINTENANCE
CAUTION:
•
Always be sure that the tool is switched off and
unplugged before attempting to perform inspection
or maintenance.
•
Never use gasoline, benzine, thinner, alcohol or
the like. Discoloration, deformation or cracks may
result.
Replacing carbon brushes
Fig.4
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.5
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.