Hitachi DH 25PB Instructions De Sécurité Et Mode D'emploi page 16

English
CAUTION:
When removing the center pin and the guide plate, turn OFF the switch and disconnect
the plug form the receptacle.
3. Dismounting. (Fig. 17)
Remove the core bit shank from the rotary
hammer and strike the head of the core bit
shank strongly two or three times with the
manual hammer holding the core bit, then the
thread becomes loose and the core bit can be
removed.
16
Core bit shank
Fig. 17