Product Manual

Page 12
OPERATION
Practice with various fasteners, noting the
length of time required to reach the desired
torque. Check the tightness with a hand-
torque wrench. If the fasteners are too tight,
reduce the impacting time. If they are not
tight enough, increase the impacting time.
Hold the tool firmly, and place the socket
over the bolt or nut. Turn the tool on, and
fasten the bolt or nut to the proper torque.
The torque that is required to loosen a
fastener averages 75% to 80% of the
tightening torque, depending on the
condition of the contacting surfaces.
However, if rust or corrosion causes seizing,
more torque may be required.
After fastening, always check the torque
with a torque wrench. The fastening torque
is affected by a wide variety of factors,
including the following:
• 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.
• Bolt
Although the torque coefficient and the
class of bolt may be the same, the proper
fastening torque will differ according to
the diameter of the bolt.
Even if 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.
• Accessories
The use of a universal joint or an extension
bar (both available separately) will reduce
the fastening force of the impact wrench
somewhat. Compensate by fastening for
a longer period of time.
• Technique
The manner of holding the tool or the
material to be fastened will affect the
torque.
INSTALLING OR REMOVING
BITS (FIG.9)
FIG. 9
1. Lock the trigger switch by placing the
direction-of-rotation selector in the OFF
(center) position.
2. To install a 1/4” hex adaptor, pull the
back sleeve of the 1/4” hex adaptor
forward and press the hex adaptor onto
the square drive. Make sure that the
steel retention ball engages into the
hole on the square drive. To remove the
hex adaptor, simply grip the back sleeve
and pull it off.
3. To install the bit, pull the front sleeve
forward, hold it in place, insert a 1/4”
bit into the hexagonal chuck, and then
release the sleeve. Check that the sleeve
returns to its original position and the bit
is securely held in place. To remove the
bit, pull the front sleeve forward and pull
the bit off.
Front sleeve
Back sleeve