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HOW TO USE
1. Switch operation
When the trigger is depressed, the tool rotates.
When the trigger is released, the tool stops.
Pulling the trigger and pushing the stopper, it keeps
the switched-on condition which is convenient for
continuous running. When switching off, the stopper
can be disconnected by pulling the trigger again.
2. Drilling
Always apply pressure in a straight line with the bit.
Use enough pressure to keep drilling, but do not push
hard enough to stall the motor or deflect the bit.
To minimize stalling or breaking through the material,
reduce pressure on drill and ease the bit through the
last part of the hole.
If the drill stalls, release the trigger immediately,
remove the bit from the work and start again. Do not
click the trigger on and off in an attempt to start a
stalled drill. This can damage the drill.
The larger the drill bit diameter, the larger the reactive
force on your arm.
Be careful not to lose control of the drill because of
this reactive force.
To maintain firm control, establish a good foothold,
use side handle, hold the drill tightly with both hands,
and ensure that the drill is vertical to the material being
drilled.
MAINTENANCE AND INSPECTION
1. Inspecting the drill bits
Since use of an abraded drill bits will cause motor
malfunctioning and degraded efficiency, replace the
drill bits with a new one or resharpening without delay
when abrasion is noted.
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.6)
The motor employs carbon brushes which are
consumable parts. Since an excessively worn carbon
brush could result in motor trouble, replace a carbon
brush with a new one which has the same brush No.
shown in the figure when it becomes worn to or near
the 'wear limit'. In addition, always keep carbon
brushes clean and ensure that they slide freely within
the brush holders.
5. Replacing a carbon brush (Fig.7)
<Disassembly>
(1) Loosen four machine screws and remove the handle
cover.
(2) Pull out the brush holder together with the carbon
brushes. Exercise adequate care not to excessively
strain the lead wire or damage it.
(3) Remove the carbon brushes from the brush holder.
<Assembly>
(1) Insert new carbon brushes in the brush holder .
(2) Insert the brush holder together with carbon brushes
into the brush holder chamber in the housing.
(3) Carefully ascertain that the internal wiring and so on
are located at their regular positions, and that there
is no possibility of the rotray part (armature) being
contacted by the internal wiring or other items.
(4) Reinstall the handle cover while exercising adequate
care not to allow the internal wiring and so on to
become caught in the housing, then tighten the handle
cover with four machine screws.
CAUTIONS
When reassembling after replacing the carbon
brushes, be sure to follow this assembling procedure.
When replacing the carbon brushes, do not tamper
with parts other than those necessary for replacing.
NOTE
Due to HITACHI's continuing program of research and
development, the specifications herein are subject to
change without prior notice.
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