Maintenance And Inspection - Hitachi DV 20V Handling Instructions Manual

English
The larger the drill bit diameter, the larger the reactive force on your arm.
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Be careful not to lose control of the drill because of this reactive force.
To maintain fi rm 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.
The drill bit may become overheated during operation; however, it is suffi ciently operable.
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Do not cool the drill bit in water or oil.
Immediately after use, while it is still revolving, if the Drill is placed on a location where
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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

WARNING
Be sure to switch power OFF and disconnect the plug from the receptacle during
maintenance and inspection.
1. Inspecting the drill bits
Since use of an abraded drill bits will cause motor malfunctioning and degraded effi ciency,
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
For your continued safety and electrical shock protection, carbon brush inspection and
replacement on this tool should ONLY be performed by a Hitachi Authorized Service
Center.
5. 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.
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