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(3) Installing the side handle and handle joint (Fig. 10)
The side handle and handle joint can be installed
on either side of the angle unit for right or left
handed use. To install the side handle and handle
joint, thread it into the socket on the desired side
of the angle unit and tighten it securely.
(4) Removing keyless chuck from angle unit
The keyless chuck can be removed from angle unit
in the same manner it was removed from the impact
drill; however, ALWAYS REMOVE ANGLE UNIT
FROM THE IMPACT DRILL BEFORE ATTEMPTING
TO LOOSEN KEYLESS CHUCK. This will prevent
damage of impact drills gear. Use open end wrench
provided to hold angle unit spindle before attempting
to loosen keyless chuck.
CAUTION:
If the keyless chuck cannot be removed by striking
the wrench, dont strike the wrench forcibly and
send the impact drill to a HITACHI AUTHORIZED
SERVICE CENTER.
7. IMPACT to ROTATION changeover (Fig. 11)
The Impact Drill can be switched from IMPACT
(impact plus rotation) to ROTATION (rotation only)
by turning the change lever. When boring concrete,
stone, tile or similar hard materials, turning the
change lever to IMPACT side. The drill head impacts
against the material while continuing to rotate.
When boring metal, wood or plastic, turning the
change lever to ROTATION side. The impact drill
can be used as an ordinary electric drill.
CAUTION
Do not use the IMPACT function for the material
such as woods or metals. Such usage will not only
reduce drill efficiency, but may also damage the
drill tip.
The change lever may not turn smoothly when
changing from impact drill mode to drill mode. (Fig.
11)
In this case, operate the machine for few seconds.
The spindle shaft will then be pushed forward, and
the change lever can be moved smoothly.
8. High-speed/Low-speed changeover (Fig. 12)
Prior to changing speed, ensure that the impact drill
has come to a complete stop. To change speed,
depress the shift lock and slide in to the appropriate
direction, as indicated by the arrow in Fig. 12. The
numeral "1" engraved in the impact drill body denotes
low speed, the numeral "2" denotes high speed.
PRACTICAL HANDLING PROCEDURES
1. Switch operation
When the switch trigger is depressed, the tool
rotates. When the switch trigger is released, the tool
stops.
The rotational speed of the impact drill can be
controlled by varying the amount that the switch
trigger is pulled. Speed is low when the switch
trigger is pulled slightly and increases as the switch
trigger is pulled more.
When releasing the switch trigger, the brake will
be applied for immediate stopping.
2. When using as a Drill or an Impact Drill
(1) Pressing force of the impact drill
You cannot drill holes more quickly even if you
press the impact drill with a stronger force than
necessary. It not only damages tip of drill bit and
decreases the efficiency of operation, but also
shortens the life of the drill tip.
(2) In case of penetrating holes
Drill bits can be broken when the material being
drilled is penetrated. It is important to decrease
pressing force just before penetrating.
CAUTION
In continuous operation, conduct no-load operation
for five seconds after completing a drilling job.
(3) When a thick drill bit is used
Your arm is subjected to larger reaction force when
a thicker drill bit is used. Be careful not to be moved
by the reaction force. For this, establish a foothold,
hold the unit tightly with both hands perpendicu-
larly to the material being drilled.
NOTE
The use of the battery EB2430HA in a cold condition
(below 0 degree Centigrade) can sometimes result
in the weakened drilling torque and reduced amount
of work. This, however, is a temporary phenomenon,
and returns to normal when the battery warms up.
MAINTENANCE AND INSPECTION
1. Inspecting the drill bit
Continued use of a worn and/or damaged drill bit
will result in reduced drilling efficiency and may
seriously overload the drill motor. Inspect the drill
bit frequently and replace it as necessary.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure
that they are properly tightened. Should any of the
screws be loose, retighten them immediately. Failure
to do so could result in serious hazard.
3. Maintenance of the motor
The motor unit winding is the very "heart" of the
power tool.
Exercise due care to ensure the winding does not
become damaged and/or wet with oil or water.
4. Inspecting the carbon brushes (Fig. 13)
The motor employs carbon brushes which are
consumable parts. Since and excessively worn
carbon brush can result in motor trouble, replace
the carbon brush with new ones when it becomes
worn to or near the "wear limit". In addition, always
keep carbon brushes clean and ensure that they
slide freely whthin the brush holders
NOTE:
When replacing the carbon brush with a new one,
be sure to use the Hitachi Carbon Brush Code No.
999058.
5. Replacing carbon brushes
Take out the carbon brush by first removing the
brush cap and then hooking the protrusion of the
carbon brush with a flat head screw driver, etc., as
shown in Fig. 15.
When installing the carbon brush, choose the
direction so that the nail of the carbon brush agrees
with the contact portion outside the brush tube.
Then push it in with a finger as illustrated in
Fig. 16. Lastly, install the brush cap.
CAUTION:
Be absolutely sure to insert the nail of the carbon
34

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