Maintenance And Inspection - Hitachi Koki D 13 Instruction Manual

2. Using a large diameter drill bit
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,
hold the drill tightly with both hands, and ensure
that the drill is vertical to the material being drilled.
3. When drilling completely through the material
When the drill bit bores completely through the
material, careless handing often results in broken
drill bit or damage to the drill body itself due to
the sudden movement of the drill.
Always be alert and ready to release pushing force
when drilling through the material.
4. Switch operation
(1) Trigger switch
By pulling the trigger switch and depressing the
stopper, the switch is held in the ON position for
continuous drilling. To turn the drill OFF, pull the
trigger switch again and release.
(2) Reversing switch
This drill can rotate both clockwise (for drilling) and
counterclockwise (for releasing the drill bit) by
operating the reversing switch.
CAUTION
Never change the direction of rotation while the
motor is rotating. Turn the power switch off before
changing the direction of rotation.
5. Precautions on boring
The drill bit may become overheated during
operation; however, it is sufficiently operable. Do
not cool the drill bit in water or oil.
6. Caution concerning immediately after use
Immediately after use, while it is still revolving, if
the Drill is placed on a location where considerable
ground chips and dust have accumulated, dust may
occasionally be absorbed into the drill mechanism.
Always pay attention to this undesirable possibility.

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. Inspecting the carbon brushes
The motor employs carbon brushes which are
consumable parts.
When the brushes are worn down, motor trouble
may result. When the brushes are worn down to
the limit line, replace the brushes with new ones.
Keep the brushes clean, so that they smoothly slide
into the brush holders.
When replacing the brushes with new ones, be sure
to use a pair of brushes for HITACHI ELECTRIC DRILL
Type D13 corresponding to the illustrated number.
Auto-stop carbon brushes automatically cut off the
electric circuit, when it is worn down to the wear limit.
This indicates the replacement time of the brush
and prevents damage of the commutator.
4. Replacing carbon brushes
Disassemble the brush caps with a slotted-head
screwdriver. The carbon brushes can then be easily
removed.
5. 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.
6. Replacing supply cord
If the replacement of the supply cord is necessary,
it has to be done by Hitachi Authorized Service
Center to avoid a safety hazard.
7. Service parts list
A: Item No.
B: Code No.
C: No. Used
D: Remarks
CAUTION
Repair, modification and inspection of Hitachi Power
Tools must be carried out by a Hitachi Authorized
Service Center.
This Parts List will be helpful if presented with the
tool to the Hitachi Authorized Service Center when
requesting repair or other maintenance.
In the operation and maintenance of power tools,
the safety regulations and standards prescribed in
each country must be observed.
MODIFICATION
Hitachi Power Tools are constantly being improved
and modified to incorporate the latest technological
advancements.
Accordingly, some parts (i.e. code numbers and/or
design) may be changed without prior notice.
GUARANTEE
We guarantee Hitachi Power Tools in accordance with
statutory/country specific regulation. This guarantee does
not cover defects or damage due to misuse, abuse, or
normal wear and tear. In case of complaint, please send
the Power Tool, undismantled, with the GUARANTEE
CERTIFICATE found at the end of this Handling
instruction, to a Hitachi Authorized Service Center.
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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