Hitachi DH 24PM Technical And Service Manual page 20

Switching the tool retainer between the drill chuck holder and the drill bit holder
<Removing>
Turning the lock grip in the direction indicated with an arrow on the
lock grip, pull out the lock grip. If it is hard to pull out the lock grip,
put the Model DH 24PM in "Hammering only" mode then turn and
pull out the lock grip. The above two steps are required to remove
the lock grip for prevention of inadvertent dropping.
<Mounting>
Turn the drill chuck holder or the drill bit holder in the direction indicated with an
arrow on the lock grip until the spline is engaged. Then push in the lock grip turning
further. Thus the drill chuck holder or the drill bit holder can be easily mounted
without position adjustment. After mounting, pull the drill chuck holder or the drill bit
holder to check for secure mounting.
Drill chuck holder
or drill bit holder
Spline
Lock grip
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Lock grip