Makita DBM230 Notice Originale page 29

After drilling
After you have finished drilling:
Remove the drill bit from the borehole.
Switch the motor off. Use the motor switch and not the GFCI for this
purpose.
Close the water supply.
Removal of the bore core, in case it is stuck in the drill bit.
Remove the drill bit from the motor.
Put the drill bit in an vertical position.
Slightly tap with the wooden handle of a hammer against the tube until
the bore core slides out. Never knock the drill bit forcefully against a
wall or treat it with tools like hammers or wrenches, the tube may
become deformed so that neither the bore core will loosen nor the drill
bit may be used again.
Removal of the bore core in a blind hole
Break off the core with a wedge or a lever. Remove the core with suitable
pliers or drill a hole into the core, insert a lifting screw and pull the core out.
Maintenance and Care
Before doing any work on the machine, pull the mains plug!
Repairs may only be performed by qualified, trained and experienced
personnel.
After each repair the tool must be inspected by an electrical specialist.
Due to its design, the tool needs only a minimum of care and maintenance.
Nevertheless the following rules should be observed:
Clean the core drill unit after finishing the drilling. Afterwards grease
the thread of the drill spindle. The air vents must always be open and
clean. Take care that while cleaning the tool no water enters into the
core drill tool.
After the first 150 operating hours the transmission oil must be
exchanged. The oil exchange will greatly increase the life cycle of the
transmission.
After approx. 200 operating hours the carbon brushes must be
inspected by an electrical specialist and replaced if necessary (only
use original carbon brushes).
Switches, cable and plug must be inspected regularly by an electrical
specialist.