10
When not using the center bit
Screw the core bit on the adapter. Install the adapter with the
core bit in the tool in the same manner as a drill bit.
Rotate the change lever to the position. Rest the core bit
on the concrete and turn the tool on. Once the core bit has
cut a shallow groove into the concrete, rotate the change
lever to the position and resume drilling.
NOTE:
•No problem is caused even if the core bit unscrews
slightly during brief use since the core bit rotates in the
tightening direction.
To remove the core bit, follow the same removal procedures
covered in “When using the center bit”.
MAINTENANCE CAUTION:
•Always be sure that the tool is switched off and
unplugged before attempting to perform inspection or
maintenance.

Replacing carbon brushes

When the resin insulating tip inside the carbon brush is
exposed to contact the commutator, it will automatically shut
off the motor. When this occurs, both carbon brushes should
be replaced. Keep the carbon brushes clean and free to slip
in the holders. Both carbon brushes should be replaced at
the same time. Use only identical carbon brushes.
1. Core bit
2. Adapter
1
2
003216
003212
1. Commutator
2. Insulating tip
3. Carbon brush
1
2
3
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