Hitachi Koki DH40FR - 1-9/16 Inch Spline Shank Rotary Hammer Instruction Manual page 15

2. How to bore (Fig. 16)
(1) Connect the plug to the receptacle.
(2) A spring is installed in the center pin. Push it
lightly to the wall or the floor straight. Connect
all over the surface of the core bit tip and start
operating.
(3) When boring about 3/16" (5 mm) in depth the
position of the hole will establish. Bore after
that removing the center pin and the guide
plate from core bit.
(4) Application of excessive force will not only
expedite the work, but will deteriorate the tip
edge of the drill bit, resulting in reduced service
life of the rotary hammer.
CAUTION:
When removing the center pin and the guide
plate, turn OFF the switch and disconnect the
plug from 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 a
manual hammer holding the core bit, then the
thread becomes loose and the core bit can be
removed.
Fig. 16
Core Bit
Shank
Fig. 17
English
15