Maintenance - Makita 6904VH Instruction Manual

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 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.
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 type of materials to be fastened and the manner of holding the machine will affect the torque.
Screwdriving (Fig. 6)
For 6904VH only
When driving screws, install a bit adapter (optional
accessory) on the machine 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 machine. Start the machine slowly
and then increase the speed gradually. Release the
trigger just as the screw bottoms out.
NOTE:
• Use the best size driver bit for the size of screw that
you wish to use.
• Hold the machine pointed straight at 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 splitting of the
workpiece. The pilot holes should be slightly smaller
than the wood screws in diameter.
6

MAINTENANCE

CAUTION:
Always be sure that the machine is switched off and
unplugged before carrying out any work on the
machine.
To maintain product safety and reliability, repairs,
maintenance or adjustment should be carried out by
Makita Authorized Service Center.