Makita 6904VH Instruction Manual page 8

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
:
0
Hold the tool pointed straight
a t
the bolt or nut without applying excessive pressure on
the tool.
0
Excessive fastening torque may damage the bolt or nut. Before starting your job, always
perform a t e s t operation to verify the adequate fastening speed and 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.
2.
3.
4.
5.
Voltage
Voltage drop will cause a reduction in the fastening torque.
Socket
*Failure t o 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
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 the 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.
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.
The type of materials to be fastened and the manner of holding the tool will affect the
torque.
fastening torque.
Screwdriving
When driving screws, install
a
bit adapter
(optional accessory) on the tool and insert
a
driver bit (optional accessory) into the
bit adapter. Place the point of the driver
bit in the screw head and apply pressure to
the tool. Start the tool slowly and then
increase the speed gradually.
Release
the
trigger just as the screw bottoms out.
I
NOTE
:
Use the best size driver bit for the size of screw that you wish to use.
0
Hold the tool pointed straight
a t
the screw, or the screw and/or bit may be damaged.
When driving wood screws, pridrill pilot holes to make driving easier and to prevent split-
ting of the workpiece. The pilot holes should be slightly smaller than the wood screws
in diameter.
8