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8-4. "Three-Mode" Changeover Mechanism
The change lever of the Model DH 30PC2 permits quick and easy changeover among the "Rotation and
hammering", "Rotation only" and "Hammering only" functions. Each function mode is explained below. When
operating the change lever, be sure to continue pressing the pushing button.
Rotation and hammering (Fig. 6)
Adjust the change lever to "Rotation and hammering" ( mark). Claws of the bevel gear engage with
matching claws of the clutch and rotation is transmitted to the cylinder coupled to the clutch. Thus the tool is
turned. When the tool is pressed against a workpiece, slide sleeve (A) blocks the air hole of the cylinder to
make an air chamber between the piston and the striker. The striker is then moved according to the pressure
fluctuation in the air chamber and transmits the hammering force to the second hammer and the tool.
Fig. 6
Hammering only (Fig. 7)
Adjust the change lever to "Hammering only" ( mark). Engagement between the bevel gear and the clutch is
released and no rotation is transmitted. The spline inside the lock sleeve engages with the spline outside the
clutch to lock the turning motion of both the cylinder and the tool. When the tool is pressed against a
workpiece, slide sleeve (A) blocks the air hole of the cylinder to make an air chamber between the piston and
the striker. The striker is then moved according to the pressure fluctuation in the air chamber and transmits the
hammering force to the second hammer and the tool.
Bevel gear
Air hole
Lock sleeve
Clutch
Cylinder
Change lever
Slide sleeve (A)
