Urrea LI1120, Instruction Manual, Page: 13 / 16

13
E N G L I S H •
User's Manual
the proper fastening time for your bolt or nut.
Practice with various fasteners, noting the
length of time required to reach the desired
torque. Check the tightness with a handtorque
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 fol-
lowing:
• 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 fas-
tening 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.
WARNING: Always wear safety goggles or
safety glasses with side shields during power
tool operations, or when blowing dust. If opera-
tion is dusty, also wear a dust mask.
WARNING: Do not at any time let brake
fluids, gasoline, petroleum-based products,
penetrating oils, etc. come in contact with
plastic parts. Chemicals can damage, weaken
or destroy plastic, which may result in serious
personal injury.
MAINTENANCE
The tool may be cleaned most effectively with
compressed dry air. Always wear safety goggles
when cleaning tools with compressed air.
Avoid using solvents when cleaning plastic
parts. Most plastics are susceptible to damage
from various types of commercial solvents and
may be damaged by their use.
Use clean clothes to remove dirt, dust, oil,
grease, etc.
BEFORE EACH USE
1. Inspect the Impact Wrench, the on/off switch
and the accessories for damage.
2. Check for damaged, missing, or worn parts.
3. Check for loose screws, misalignment or bind-
ing of moving parts, or any other condition that
may affect the operation.
4. If abnormal vibration or noise occurs, turn the
tool off immediately and have the problem cor-
rected before further use.
5. Detach the battery from the Impact
Wrench before cleaning or performing any
maintenance. Using compressed air may be the
most effective cleaning method.
Always wear safety goggles when cleaning tools
using compressed air.
LUBRICATION
All of the bearings in this tool are lubricated
with a sufficient amount of high grade lubricant
for the life of the unit under normal conditions.
Therefore, no further lubrication is required.
TROUBLESHOOTING
PROBLEM CAUSE SOLUTION
The Impact
Wrench does
not work.
The battery is depleted.
Charge the
battery.
The Impact
Wrench does
not work and
the tool LED
worklight
flashes.
The tool is overheated.
Allow the
tool to cool
down.
The impact
wrench does
not work and
the battery
pack LED light
flashes.
The battery is over-
heated.
Allow the
battery to
cool down.