Hitachi DH 30PC2 Technical Data And Service Manual page 20

Slide sleeve (A)
Rotation only (Fig. 8)
Adjust the change lever to "Rotation only" (
the clutch and rotation is transmitted to the cylinder coupled to the clutch. Thus the tool is turned.
When the lock sleeve is moved toward the tip, the amount of backward movement of slide sleeve (A) is limited
to the position where it contacts the lock sleeve to keep the air hole of the cylinder opened. Thus there is no
pressure fluctuation in the air chamber and no hammering force is transmitted.
Slide sleeve (A)
Air hole
Cylinder
Change lever
mark). Claws of the bevel gear engage with matching claws of
Cylinder Lock sleeve
Change lever
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Lock sleeve
Clutch
Bevel gear
Fig. 7
Air hole Clutch
Bevel gear
Fig. 8