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OPERATING INSTRUCTIONS
NOTICE: Excessive fastening torque may damage the bolt/nut or socket.
Practice with various fasteners, noting the length of time required to reach the desired torque.
Check the tightness with a torque wrench. If the fasteners are too tight, reduce the impacting
time. If they are not tight enough, increase the impacting time.
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 coefcient and the class of bolt may be the same, the proper
fastening torque will differ according to the diameter of the bolt. Although the diameters
of bolts may be the same, the proper fastening torque will differ according to the torque
coefcient, the class of bolt and the bolt length.
• The use of a universal joint or an extension bar (both sold separately) will reduce the
fastening force of the impact wrench somewhat. Compensate by fastening for a longer
period of time.
• The manner of holding the tool or the material to be fastened will affect the torque.
Loosening Fasteners
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
CARE AND MAINTENANCE
All maintenance should only be carried out by a qualied service technician.
Cleaning
Before cleaning or performing any maintenance, remove the battery pack. For safe and
proper operation, always keep the tool and its ventilation slots clean.
Always use only a soft, dry cloth to clean your impact wrench; never use detergent or alcohol.
TROUBLESHOOTING
WARNING
Place the direction-of-rotation selector (B) in the center lock position and remove the battery
before performing troubleshooting procedures.
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Tool does not work. Low battery capacity. Charge the battery pack.
The socket cannot
be installed.
Bit does not t the
chuck.
Use a suitable adapter or claimed capacity
socket.
Motor overheating Cooling vents are
obstructed
Clean and clear vents. Do not cover vents
with hand during operation
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