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CAUTION
Applying the im pact driver for too long tightens the
screw too m uch and can break it.
Tightening a screw w ith the im pact driver at an angle
to that screw can dam age the head of the screw and
the proper force w ill not be transm itted to the screw .
Tighten w ith this im pact driver lined up straight w ith
the screw .
OPERATIONAL CAUTIONS
1. Resting the unit after continuous w ork
After use for continuous bolt-tightening w ork, rest
the unit for 15 m inutes or so w hen replacing the
battery. The tem perature of the m otor, sw itch, etc.,
w ill rise if the w ork is started again im m ediately after
battery replacem ent, eventually resulting in burnout.
NOTE
Do not touch the protector, as it gets very hot during
continuous w ork.
2. Cautions on use of the speed control sw itch
This sw itch has a built-in, electronic circuit w hich
steplessly varies the rotation speed. Consequently,
w hen the sw itch trigger is pulled only slightly (low
speed rotation) and the m otor is stopped w hile
continuously driving in screw s, the com ponents of the
electronic circuit parts m ay overheat and be dam aged.
3. Use a tightening time suitable for the screw
The appropriate torque for a screw differs according to
the material and size of the screw, and the material
being screwed etc., so please use a tightening time
suitable for the screw. In particular, if a long tightening
time is used in the case of screws smaller than M8, there
is a danger of the screw breaking, so please confirm the
tightening time and the tightening torque beforehand.
4. Work at a tightening torque suitable for the bolt
under impact
The optimum tightening torque for nuts or bolts differs
w ith m aterial and size of the nuts or bolts. An
excessively large tightening torque for a sm all bolt
m ay stretch or break the bolt. The tightening torque
increases in proportion to the operation tim e. Use
the correct operating tim e for the bolt.
5. Holding the tool
Hold the im pact w rench firm ly w ith both hands. In
this case hold the w rench in line w ith the bolt.
It is not necessary to push the w rench very hard.
Hold the w rench w ith a force just sufficient to
counteract the im pact force.
6. Confirm the tightening torque
The follow ing factors contribute to a reduction of the
tightening torque. So confirm the actual tightening
torque needed by screw ing up som e bolts before the
job w ith a hand torque w rench. Factors affecting the
tightening torque are as follow s.
(1) Voltage
When the discharge m argin is reached, voltage
decreases and tightening torque is low ered.
(2) Operating tim e
The tightening torque increases w hen the operating
tim e increases. But the tightening torque does not
increase above a certain value even if the tool is
driven for a long tim e.
(3) Diam eter of bolt
The tightening torque differs w ith the diam eter of the
bolt. Generally a larger diam eter bolt requires larger
tightening torque.
(4) Tightening conditions
The tightening torque differs according to the torque
ratio; class, and length of bolts even w hen bolts w ith
the sam e size threads are used. The tightening torque
also differs according to the condition of the surface
of w orkpiece through w hich the bolts are to be
tightened. When the bolt and nut turn together, torque
is greatly reduced.
(5) Using optional parts (Im pact w rench)
The tightening torque is reduced a little w hen an
extension bar, universal joint or a long socket is used.
(6) Clearance of the socket (Im pact w rench)
A w orn or deform ed hex. or a square-holed socket
w ill not give an adequate tightness to the fitting
betw een the nut or anvil, consequently resulting in
loss of tightening torque.
Using an im proper socket w hich does not m atch to
the bolt w ill result in an insufficient tightening torque.
M AINTENANCE AND INSPECTION
1. Inspecting the driver bit (Impact driver)
Using a broken bit or one w ith a w orn out tip is
dangerous because the bit can slip. Replace it.
2. Inspecting the socket (Impact w rench)
A worn or deformed hex. or a square-holed socket will
not give an adequate tightness to the fitting between
the nut or anvil, consequently resulting in loss of
tightening torque. Pay attention to wear of a socket
holes periodically, and replace with a new one if needed.
3. Inspecting the mounting screw s
Regularly inspect all m ounting screw s and ensure
that they are properly tightened. Should any of the
screw s be loose, retighten them im m ediately. Failure
to do so m ay result in serious hazard.
4. M aintenance of the motor
The m otor unit w inding is the very " heart" of the
pow er tool.
Exercise due care to ensure the w inding does not
becom e dam aged and/or w et w ith oil or w ater.
5. Inspecting the carbon brushes (Fig. 13)
The m otor em ploys carbon brushes w hich are
consum able parts. Since and excessively w orn carbon
brush can result in m otor trouble, replace the carbon
brush w ith new ones w hen it becom es w orn to or
near the " w ear lim it" P. In addition, alw ays keep
carbon brushes clean and ensure that they slide freely
w ithin the brush holders.
NOTE
When replacing the carbon brush w ith a new one, be
sure to use the Hitachi Carbon Brush Code No. 999054.
6. Replacing carbon brushes
Take out the carbon brush by first rem oving the
brush cap and then hooking the protrusion of the
carbon brush R w ith a slotted head screw driver,
etc., as show n in Fig. 15.
When installing the carbon brush, choose the direction
so that the nail of the carbon brush Q agrees w ith the
contact portion outside the brush tube S. Then push
it in w ith a finger as illustrated in Fig. 16. Lastly,
install the brush cap.
English
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