Makita 6904VH Bedienungsanleitung Seite 6

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 perform a test operation to determine the
proper fastening time for your bolt or nut.
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 fasten-
ing 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.
Standard bolt
.
N m
.
(ft lbs)
200
(2,040)
150
(1,530)
100
(1,020)
50
(510)
0 0.5
For 6905H
M20X50
M20
M16X50
M16
M12X50
M12
1 1.5
Fastening time
High tensile bolt
.
N m
.
(kg cm)
300
(3,060)
250
(2,550)
200
(2,040)
150
(1,530)
100
(1,020)
50
(510)
0
Screwdriving operation
► Fig.7
For 6904VH only
When driving screws, install a bit adapter (optional
accessory) on the tool and insert a driver bit (optional
accessory) into the bit adapter.
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. Start
the tool slowly and then increase the speed gradually.
Release the switch trigger just as the screw bottoms
out.
NOTE:
• Use the proper bit for the head of the screw/bolt
that you wish to use.
• Hold the tool pointed straight at the screw or the
screw and/or bit may be damaged.
• When driving wood screws, predrill pilot holes
to make driving easier and to prevent splitting of
the workpiece. The pilot holes should be slightly
smaller than the wood screws in diameter.
(S)
6 ENGLISH
For 6905H
M12X50
1 2 3 4 5
Fastening time
M16X50
M16
M12
7 8
6
(S)