Maintenance And Inspection - Hitachi Koki DC 120V Mode D'emploi

CAUTION
When drilling with a diamond core bit, there will be a
high force of reaction load to your hands. Make sure
to hold the handle of the main body and the side
handle.
Safety-Release Clutch
This tool is equipped with a positive type Safety-
Release Clutch. The clutch will slip when a certain
torque level is required, causing the motor to
disengage from the output shaft. When this happens,
the chuck will stop turning.
CAUTION
Immediately pull away the main body when the
Safety-Release Clutch starts its operation.
Do not continue to operate the tool for more than two
seconds while the clutch is slipping.
Do not let the Safety-Release Clutch activate too
frequently.
4. Drilling with a conventional drill bit
(1) Drilling in wood
Use a woodworking drill bit. However, use an
metalworking drill bit when drilling a hole which is
less than 6.5 mm in diameter. The usable drill bit
diameter is maximum 30 mm.
(2) Drilling in mild steel or plastics
Use a conventional metalworking drill bit. The usable
drill bit diameter is minimum 1.2 mm and maximum
13 mm.
CAUTIONS
Pressure:
Drilling will NOT be accelerated by placing heavy
pressure on the drill. Such action will only result in a
damaged drill bit, decreased drilling efficiency, and/
or shortened service life of the drill.
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 foot-hold, hold the drill
tightly with both hands, and ensure that the drill is
vertical to the material being drilled.
When drilling completely through the material:
When the drill bit bores completely through the
material, careless handling 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.

MAINTENANCE AND INSPECTION

1. Inspecting the diamond core bit
Continued use of a dull or damaged diamond core bit
results in reduced drilling efficiency and may cause
overloading of the motor. Replace the diamond core
bit with a new one as soon as excessive 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. 3)
The motor employs carbon brushes which are
consumable parts. Since an excessively worn carbon
brush can result in motor trouble, replace the carbon
brushes with new ones which have the same carbon
brush No. shown in the figure when they become
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 carbon brushes
Disassemble the brush caps with a slotted-head
screwdriver the carbon brushes can the be easily
removed.
6. 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.
MODIFICATIONS
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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