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4. Adjusting the drilling speed
D10YB is equipped with electric control circuit which
enables non-step speed control.
To adjust the speed, turn the dial shown in Fig. 5. When
the dial is set to "1", the drilling speed is minimum speed
(500 /min). When the dial is set to "5", the drilling speed
is maximum speed (2300 /min). Adjust the drilling
speed according to the material.
NOTE
When the dial is set to "1", there can be cases where no
rotation takes place due to a power situation, etc. In this
case, raise the dial slightly before use.
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 (Fig. 7)
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 fi gure 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 be easily removed.
NOTE
Due to HITACHI's continuing program of research and
development, the specifi cations herein are subject to
change without prior notice.
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